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cmt21 50aw rev 0.8 | page 1 / 31 www. hoperf.c om cmt2150aw 240 ? 480 mhz ook stand - alone transmitter with encoder copyright ? by cmostek features ? embedded eeprom ? very easy development with rfpdk ? all features programmable ? frequency range: 240 to 480 mhz ? symbol rate: 0.5 to 4 0 k s ps ? output power: - 10 to +13 dbm ? current consum ption: 8. 5 ma @ +10 dbm ? sleep current : < 2 0 na ? stand - alone, no ext ernal mcu control required ? embedded 1920, 1527 and 2262 data encoder ? up t o 7 con figurable data pins for push buttons ? led indicator for low battery detection and transmission ? sync id auto - study w ith cmostek receiver ? fcc / etsi compliant ? rohs compliant ? 14- pin so p package applications ? low - cost consumer electronics applications ? home and building automation ? remote fan controllers ? infrared transmitter replacements ? industrial monitoring and controls ? remote lighting control ? wireless alarm and security systems ? remote keyless entry (rke) descriptions the cmt21 50aw is a true single - chip, highly flexible, high performance, ook rf transmitter with embedded data encoder ideal for 240 to 480 mhz wireless applications . the device integrates a data en coder that is not only compatible with the most common used encoding fo rmat of 1527 and 2262, but also a more efficient, flex ible and powerful format of 1920 designed by cmostek . up t o 7 configurable push buttons are supported in multiple butt on modes. when pairing the device to cmostek receiver, the synchronization id can be programmed into both of the transmitter and receiver during the manufacturing phase, or studied by the receiver from the transmitter remotely by end customers. an embedded eeprom allows the rf and encoder parameters to be programmed into the chip using th e cmostek usb programmer and the rfpdk. alternatively, in stock product of 433.92 mhz is available for immediate demands with out the need of eeprom programming. the cmt21 50aw is part of the cmostek nextgenrf tm family, together with cmt225x series receivers , they enable ultra low cost, low power consumption rf links. ordering information part number frequency package option moq cmt21 50aw - esr 433.92 mhz t&r 2,500 pcs cmt2150aw - esb 433.92 mhz tube 1, 0 00 pcs more ordering info: see page 26 1 2 3 4 5 6 7 14 13 12 10 9 8 11 led vdd gnd rfo k7 k6 k5 xtal clk data k1 k2 k3 k4 cmt21 50aw so p14
cmt21 50aw rev 0.8 | page 2 / 31 www. hoperf.c om typical application ant vdd u1 c2 l2 c1 l1 c0 sw7 sw6 sw5 led vdd gnd rfo k7 k6 k5 1 2 3 4 5 6 7 d1 8 9 10 11 12 13 14 sw4 sw3 sw2 sw1 xtal clk data k1 k2 k3 k4 x1 clk data clk data j1 1 2 3 4 vdd cmt2150aw note: connector j1 is for eeprom programming figure 1 . cmt21 50 aw typical application schematic table 1 . b om of 315/ 433.92 mhz t ypical application designator descriptions value unit manufacturer 315 mhz 433.92 mhz u1 cmt21 50aw , 240 ? 480 mhz ook s tand - a lone t ransmitter with e ncoder - - cmostek x1 20 ppm, smd32*25 mm crystal 26 mhz epson c0 20%, 0402 x7r, 25 v 0.1 uf murata grm15 c1 5%, 0402 np0, 50 v 82 82 pf murata grm15 c2 5%, 0402 np0, 50 v 9.1 9 .1 pf murata grm15 l1 5%, 0603 multi - layer chip inductor 180 180 nh murata lqg18 l2 5%, 0603 multi - layer chip inductor 39 22 nh murata lqg18 d1 d0603, red led - - - sw [ 7 : 1 ] push buttons - - -
cmt21 50aw rev 0.8 | page 3 / 31 www. hoperf.c om abbreviations abbreviations used in this data sheet are described below an application notes ook on - off keying bom bill of materials pa power amplifier bsc basic spacing between centers pc personal computer bw bandwidth pcb printed circuit board dc direct current pll phase lock loop eeprom electrically erasable programmable read - only memory pn phase noise rbw resolution bandwidth esd electro - static discharge rclk reference clock esr equivalent series resistance rf radio frequency gui graphical user interface rfpdk rf product development kit ic integrated circuit rohs restriction of hazardous substances ldo low drop - out rx receiving, receiver max maximum sot small - outline transistor mcu microcontroller unit tbd to be determined min minimum tx transmission, transmitter moq minimum order quantity typ typical np0 negative - positive - zero xo/xosc crystal oscillator obw occupied bandwidth xtal crystal
cmt21 50aw rev 0.8 | page 4 / 31 www. hoperf.c om table of contents 1. electrical characteristics ............................................................................................................................................ 5 1.1 recommended operating conditions ................................................................................................................... 5 1.2 absolute maximum ratings ................................................................................................................................... 5 1.3 transmitter specifications ..................................................................................................................................... 6 1.4 crystal oscillator ................................................................................................................................................... 7 2. pin descriptions .......................................................................................................................................................... 8 3. typical performance characteristics ......................................................................................................................... 9 4. typical application schematics ............................................................................................................................... 10 4.1 low - cost application schematic ......................................................................................................................... 10 4.2 fcc/etsi compliant application schematic ....................................................................................................... 11 5. functional descriptions ............................................................................................................................................ 12 5.1 overview ............................................................................................................................................................. 12 5.2 modulation, frequency and symbol rate ........................................................................................................... 12 5.3 embedded eeprom and rfpdk ...................................................................................................................... 13 5.4 power amplifier ................................................................................................................................................... 15 5.5 pa ramping ........................................................................................................................................................ 15 5.6 working states .................................................................................................................................................... 16 5.7 the encode r ........................................................................................................................................................ 17 5.7.1 1920 packet structure ............................................................................................................................................17 5.7.2 1527 packet structure ............................................................................................................................................18 5.7. 3 2262 packet structure ............................................................................................................................................19 5.8 id study .............................................................................................................................................................. 20 5.9 button modes ...................................................................................................................................................... 20 5.9.1 normal ......................................................................................................................................................................20 5.9.2 matrix ........................................................................................................................................................................21 5.9.3 toggle .......................................................................................................................................................................22 5.9.4 pwm .........................................................................................................................................................................23 5.10 led driving capability ........................................................................................................................................ 24 5.11 low battery detection (lbd) ............................................................................................................................... 24 5.12 crystal oscillator and rclk ................................................................................................................................ 24 6. ordering information ................................................................................................................................................. 26 7. package outline ......................................................................................................................................................... 27 8. top marking ............................................................................................................................................................... 28 8.1 cmt2150aw top marking .................................................................................................................................. 28 9. other documentations .............................................................................................................................................. 29 10. docu ment change list .............................................................................................................................................. 30 11. contact information .................................................................................................................................................. 31
cmt21 50aw rev 0.8 | page 5 / 31 www. hoperf.c om 1. electrical characteristics v dd = 3.3 v, t op = 25 , f rf = 433.92 mhz, output power is +10 dbm terminated in a matched 50 impedance, unless otherwise noted . 1.1 recommended operating conditions table 2 . recommended operation conditions parameter symbol conditions min typ max unit operation voltage supply v dd 1.8 3.6 v operation temperature t op - 40 85 supply voltage slew rate 1 mv/us 1.2 absolute maximum ratings table 3 . absolute maximum ratings [1] parameter symbol conditions min max unit supply voltage v dd - 0.3 3.6 v interface voltage v in - 0.3 v dd + 0.3 v junction temperature t j - 40 125 storage temperature t stg - 50 150 soldering temperature t sdr lasts at least 30 seconds 255 esd rating human body model (hbm) - 2 2 kv latch - up current @ 85 - 100 100 ma note: [1]. stresses above those listed as ?absolute maximum ratings? may cause permanent damage to the device. this is a stress rating only and functional operation of the device under these conditions is not implied. exposure to maximum rating conditions for extended periods may affect device reliability . caution! esd sensitive device. precaution should be used when handling the device in order to prevent permanent damage.
cmt21 50aw rev 0.8 | page 6 / 31 www. hoperf.c om 1.3 transmitter specifications table 4 . transmitter specifications parameter symbol conditions min typ max unit frequency range [1] f rf 240 480 mhz synthesizer frequency resolution f res 198 hz maximum output power p out (max) +13 dbm minimum output power p out ( m in) - 10 dbm output power step size p step 1 db pa ramping time [2] t ramp 0 1024 us current consumption [3] @ 315 mhz i dd- 315 0 dbm 5.9 ma +10 dbm 8.1 ma +13 dbm 8.8 ma current consumption [3] @ 433.92 mhz i dd- 433.92 0 dbm, 6 ma +10 dbm 8.5 ma +13 dbm 10.2 ma sleep current i sleep 20 na symbol rate sr 0.5 4 0 ksps frequency tune time t tune from xo stable to ready to transmit, include the frequency calibration 370 us phase noise pn 100 khz offset from f rf - 8 0 dbc/hz 2 00 khz offset from f rf - 8 1 dbc/hz 4 00 khz offset from f rf - 9 1 dbc/hz 6 00 khz offset from f rf - 9 6 dbc/hz 1 .2 mhz offset from f rf - 108 dbc/hz harmonics output for 315 mhz [ 4 ] h2 315 2 nd harm @ 630 mhz, +13 dbm p out - 60 dbm h3 315 3 rd harm @ 9 4 5 mhz, +13 dbm p out - 65 dbm harmonics output for 433.92 mhz [ 4 ] h2 433.92 2 nd harm @ 867.84 mhz, +13 dbm p out - 5 2 dbm h3 433.92 3 rd harm @ 1301.76 mhz, +13 dbm p out - 57 dbm ook extinction ration 60 db occupied bandwidth @ 315 mhz f obw315 measured @ - 20 dbc, rbw = 1 khz, sr = 1.2 ksps , t ramp = 256 us 6 khz occupied bandwidth @ 433.92 mhz f obw433.92 measured @ - 20 dbc, rbw = 1 khz, sr = 1.2 ksps , t ramp = 256 us 7 khz note s : [1]. the frequency range is continuous over the specified range . [2]. 0 and 2 n us, n = 0 to 10, when set to ?0?, the pa output power will ramp to its configured value in the shortest possible time . [3]. t he working currents are tested with: 1527 packet format/normal button mode/ 4 push buttons/sync id = 0/no led . [4]. the harmonics output is measured with the application shown as figure 10 .
cmt21 50aw rev 0.8 | page 7 / 31 www. hoperf.c om 1.4 c rystal oscillator table 5 . crystal oscillator specifications parameter symbol conditions min typ max unit crystal frequency [1] f xtal 26 26 26 mhz crystal tolerance [2] 20 ppm load capacitance [ 3 ] c load 12 20 pf crystal esr rm 60 xtal startup t ime [4] t xtal 400 us note s : [1]. the cmt21 50aw can directly work with external 26 mhz reference clock input to xtal pin ( a coupl ing capacitor is required) with amplitude 0.3 to 0.7 vpp . [2]. this is the total tolerance including (1) initial tolerance, (2) crystal loading, (3) aging, and (4) temperature dep endence. the acceptable crystal tolerance depends on rf frequency and channel spacing/bandwidth. [3]. t he required crystal load capacitance is integrated on - chip to minimize the number of external c omponents . [4]. this parameter is to a large degree crystal dependen t .
cmt21 50aw rev 0.8 | page 8 / 31 www. hoperf.c om 2. pin descriptions 1 2 3 4 5 6 7 14 13 12 10 9 8 11 led vdd gnd rfo k7 k6 k5 xtal clk data k1 k2 k3 k4 figure 2 . cmt21 50 aw pi n assignments table 6 . cmt2 1 50 aw pin descriptions pin number name i/o descriptions 1 led o led driver, active low 2 vdd i power supply input 3 gnd i ground 4 rfo o power amplifier output 5 - 11 k[7:1] i push button 7 to 1 12 data io data pin to access the embedded eeprom , internally pull ed up to vdd 13 clk i clock pin to access the embedded eeprom , internally pull ed up to vdd 14 xtal i 26 mhz single - ended crystal oscillator input or external 26 mhz reference clock input
cmt21 50aw rev 0.8 | page 9 / 31 www. hoperf.c om 3. typical performance characteristics 13.4dbm @ 433.92 mhz - 56.8 dbm @ 435.12 mhz - 60 - 50 - 40 - 30 - 20 - 10 0 10 20 432.42 432.72 433.02 433.32 433.62 433.92 434.22 434.52 434.82 435.12 435.42 power (dbm) frequency (mhz) phase noise 13.6 dbm @ 433.92 mhz - 52.0 dbm @ 867.84 mhz - 70 - 60 - 50 - 40 - 30 - 20 - 10 0 10 20 250 365 480 595 710 825 940 1055 1170 1285 1400 power (dbm) frequency (mhz) (rbw = 10 khz) harmonics of 433.92 mhz - 57 dbm @1301.76 mhz - 90 - 80 - 70 - 60 - 50 1301.72 1301.75 1301.78 1301.81 power (dbm) freq (mhz) (rbw = 1 khz) 3rd harmonic - 60 - 50 - 40 - 30 - 20 - 10 0 10 20 432.92 433.12 433.32 433.52 433.72 433.92 434.12 434.32 434.52 434.72 434.92 power (dbm) frequency (mhz) ook spectrum - 50 - 40 - 30 - 20 - 10 0 10 433.17 433.37 433.57 433.77 433.97 434.17 434.37 434.57 power (dbm) frequency (mhz) spectrum of various pa ramping options 128 us 64 us 32 us 16 us 8 us 4 us - 50 - 40 - 30 - 20 - 10 0 10 433.17 433.37 433.57 433.77 433.97 434.17 434.37 434.57 power (dbm) frequency (mhz) spectrum of various pa ramping options 1024 us 512 us 256 us 128 us 64 us 32 us sr = 1.2 ksps - 2 0 2 4 6 8 10 12 14 16 1.6 1.8 2 2.2 2.4 2.6 2.8 3 3.2 3.4 3.6 3.8 power (dbm) supply voltage (v) p out vs. v dd 13 dbm 10 dbm 0 dbm figure 4 . harmonics of 433.92 mhz, p out = +13 dbm figure 5 . ook spectrum , p out = +10 dbm, t ramp = 32 us figure 6 . spectrum of pa ramping, sr = 9.6 ksps , p out = +10 dbm figure 8 . spectrum of pa ramping, sr = 1.2 ksps, p out = +10 dbm figure 3 . phase noise, f rf = 433.92 mhz, p out = +13 dbm, rbw = 10 khz, un - encoded figure 7 . output power vs. supply voltages, f rf = 433.92 mhz
cmt21 50aw rev 0.8 | page 10 / 31 www. hoperf.c om 4. typical application schematics 4.1 low - cost application schematic ant vdd u1 c2 l2 c1 l1 c0 sw7 sw6 sw5 led vdd gnd rfo k7 k6 k5 1 2 3 4 5 6 7 d1 8 9 10 11 12 13 14 sw4 sw3 sw2 sw1 xtal clk data k1 k2 k3 k4 x1 clk data clk data j1 1 2 3 4 vdd cmt2150aw note: connector j1 is for eeprom programming figure 9 . low - cost application sch ematic note s : 1. connector j1 is a must for the cmt21 50aw eeprom access during development or man ufacture phase . 2. t he general layout guidelines are listed below. for more design details, please refer to ?an1 1 1 cmt21 5x schematic and pcb layout design guideline ? ? u se as much continuous ground plane metallization as possible. ? use as many grounding vias (especially near to the gnd pins) as possible to minimize series parasitic inductance between the ground pour and the gnd pins . ? avoid using long and/or thin transmission lines to connect the components . ? a void placing the nearby inductors in the same orientation to reduce the coupling between them . ? place c 0 as close to the cmt21 50aw as possible for better filtering . 3. t he t able below shows the bom of 315/ 433.92 mhz low - cost application. for the bom of more applica tion s , please refer t o ?a n1 1 1 cmt21 5x schematic and pcb layout design guideline ? . table 7 . bom of 315/ 433.92 mhz low - cost application designator descriptions value unit manufacturer 315 mhz 433.92 mhz u1 cmt21 50aw , 240 ? 480 mhz ook s tand - a lone t ransmitter with e ncoder - - cmostek x1 20 ppm, smd32*25 mm crystal 26 mhz epson c0 20%, 0402 x7r, 25 v 0.1 uf murata grm15 c1 5%, 0402 np0, 50 v 82 82 pf murata grm15 c2 5%, 0402 np0, 50 v 9.1 9 .1 pf murata grm15 l1 5%, 0603 multi - layer chip inductor 180 180 nh murata lqg18 l2 5%, 0603 multi - layer chip inductor 39 22 nh murata lqg18 d1 d0603, red led - - - sw [ 7 :1 ] push buttons - - -
cmt21 50aw rev 0.8 | page 11 / 31 www. hoperf.c om 4.2 fcc/etsi compliant application schematic vdd u1 c2 l2 c1 l1 c0 sw7 sw6 sw5 led vdd gnd rfo k7 k6 k5 1 2 3 4 5 6 7 d1 8 9 10 11 12 13 14 sw4 sw3 sw2 sw1 xtal clk data k1 k2 k3 k4 x1 clk data cmt2150aw ant l3 c3 clk data j1 1 2 3 4 vdd note: connector j1 is for eeprom programming figure 10 . fcc/etsi compliant application schematic note s : 1. connector j1 is a must for the cmt21 50aw eeprom access during development or manufacture phase . 2. t he general layout guidelines are listed below. for more design details, please refer to ?a n1 1 1 cmt21 5x schematic and pcb layout design guideline ? . ? u se as much continuous ground plane metallization as possible. ? use as many grounding vias (especially near to the gnd pins) as possible to minimize series parasitic inductance between the ground pour and the gnd pins. ? avoid using long and/or thin transmission lines to connect the components. ? a void placing the nearby inductors in the same orientation to reduce the coupling between them . ? place c 0 as close to the cmt21 50aw as possible for better filtering . 3. the t able below shows the bom of 315/ 433.92 mhz fcc/etsi compliant application. for the bom of more appl icatio n, please refer to ? a n1 1 1 cmt21 5x schematic and pcb layout design guideline ? . table 8 . bom of 315/ 433.92 mhz fcc/etsi compliant application designator descriptions value unit manufacturer 315 mhz 433.92 mhz u1 cmt 21 50aw , 240 ? 480 mhz ook s tand - a lone t ransmitter with e ncoder - cmostek x 1 20 ppm , smd32*25 mm crystal 26 mhz epson c 0 20% , 0402 x7r , 25 v 0.1 uf murata grm15 c1 5% , 0402 np0, 50 v 68 68 pf murata grm15 c 2 5% , 0402 np0, 50 v 18 1 5 pf murata grm15 c3 5% , 0402 np0, 50 v 15 15 pf murata grm15 l1 5% , 0603 multi - layer chip inductor 180 180 nh murata lqg 18 l 2 5% , 0603 multi - layer chip inductor 51 36 nh murata lqg 18 l3 5% , 0603 multi - layer chip inductor 27 18 nh murata lqg 18 d1 d0603, red led - - - sw [ 7 : 1 ] push buttons - - -
cmt21 50aw rev 0.8 | page 12 / 31 www. hoperf.c om 5. functional descriptions modulator ldos vdd gnd clk data xtal rfo loop filter pfd/cp frac-n div encoder ramp-control interface & control logics eeprom por pa vco xosc bandgap led driver led k[7:1] figure 11 . cmt21 50 aw functional block diagram 5.1 overview the cmt21 50aw is a true single - chip, highly flexible, high performance, ook rf transmitter with embedded data encoder ideal for 240 to 480 mhz wireless applications . i t is part of the cmostek nextgenrf tm family, which include s a complete line of transmitters , receiver s and transceivers. the device integrates a data en coder that is not only compatible with the most common used encoding format of 1527 and 2262, but also a more efficient, flexible and powerful format of 1920 designed by cmostek . up to 7 con figurab le push buttons are supported in multiple button modes. t he device is optimized for the low system cost, low power consumption, battery powered application with its highly integrated and low power design. t he functional block diagram of the cmt 21 50aw is shown in f igure above . t he cmt 21 50aw is based on direct synthesis of the rf freque ncy by means of a fully integrated low - noise fractional - n frequency synthesizer. i t uses a 1 - pin crystal oscillator circuit with the required crystal load capacitance integrated on - chip to minimize the number of external c omponents . e very analog block is calibrated on each power - on reset (por) to an internal reference voltage source . t he calibration can help the chip to finely work under different temperatures and suppl y voltages. the transmission is triggered by pressing the push button(s). the data is modulated and sent out by a highly efficient pa which output power can be configured from - 10 to +13 dbm in 1 db step size. rf frequency , pa output power and other produc t features can be programmed into the embedded eeprom by the rfpdk and usb programmer . this saves the cost and simplif ies the product development and manufacturing effort. a lternatively, in sto ck product of 433.92 mhz is available fo r immediate demands with out the need of eeprom programming. t he cmt 21 50aw operates from 1.8 to 3.6 v so that it can finely work with most batteries to their useful power limits. it only consum es 8. 5 ma when t ransmitting +10 dbm powe r at 433.92 mhz under 3.3 v supply voltage. 5.2 modulation, frequency and symbol rate the cmt 21 50aw supports ook modulation with the symbol rate up to 4 0 ksps . it continuously covers the frequency range from 240 to 480 mhz, including the license free ism frequency band around 315 mhz and 433.92 mhz. t he device contains a high spectrum purity low power fractional - n frequency synthesizer with output frequency resolution better than 198 hz. see table 9 for the modulation, frequency and symbol rate specifications .
cmt21 50aw rev 0.8 | page 13 / 31 www. hoperf.c om table 9 . modulation, frequency and symbol rate parameter value unit modulation ook - frequency 240 to 480 mhz frequency resolution 198 hz symbol rate 0.5 to 4 0 ksps 5.3 embedded eepro m and rfpdk the rfpdk (rf product s development kit) is a very user - friendly software tool delivered for the user configur ing the cmt 21 50aw in the most intuitional way. the use r only needs to fill in/ select the proper value of each parameter and click the ?burn? button to complete the chip configuration. no register access and control is required in th e application program . see f igure below for the accessing of the eeprom and ta b le 10 for the summary of all the configurable parameters of the cmt 21 50aw on the rfpdk . cmt2150aw interface cmostek usb programmer clk data rfpdk eeprom figure 12 . accessing embedded eeprom for more detail s of the cmostek usb programmer and the rfpdk , please refer to ? an 1 1 3 cmt 21 50a / 2250 (1) a one - way rf link development kits user?s guide? . f or the detail of cmt 21 50aw configurations with the rfpdk, please refer to ? an1 1 2 cmt 21 50a configuration guideline ? . table 10. configurable parameters in rfpdk category parameters descriptions default mode rf settings frequency t o input a desired transmitting radio frequency in the range from 240 to 480 mhz . the step size is 0.001 mhz. 433.92 mhz basic advanced tx power to select a proper transmitting output power from - 10 dbm to +14 dbm , 1 dbm margin is given above +13 dbm. + 1 3 dbm basic advanced xtal cload on - chip xosc load capacitance options: from 1 0 to 2 2 pf . 15 .00 pf basic advanced symbol rate to determines the symbol rate of the transmitted data : from 0.5 to 40 ksps. 4.8 basic advanced pa ramping to control pa output power ramp up/down time, options are 0 and 2 n us (n from 0 to 10) . 0 us advanced led driving capability this defines the driving current of the led pin. the options are: disable, 5, 10, 15 or 20 ma. 5 ma advanced
cmt21 50aw rev 0.8 | page 14 / 31 www. hoperf.c om category parameters descriptions default mode lbd threshold this defines the low battery detection threshold. the options are: disable, 1.7, 1.8, 1.9, 2.0, 2.1, 2.2, 2.3, 2.4, 2.5, 2.6, 2.7 or 2.8 v. 2.4 v advanced encoder settings encoder select the packet encoding format, the options are: 1920, 1527 and 2262. see table 13 , table 14 and table 15 for the c onfigurable p arameters in each packet. 1527 basic advanced bit format this tells the device how many symbols are used to construct a single bit in the 1920 mode. the options are: 3, 4, 5 or 6 sym/bit. the bit format is fixed at 4 sym/bit in 1527 mode and 8 sym/bit in 2262 mode. i t is only available in 1920 mode. 3 basic advanced number of packets this defines the minimum number of packet ( s ) being transmitted during each button pressing action. i t also defines the number of packet (s) being transmitted during each periodic transmission. the range is from 1 to 256. 1 advanced packet interval this defines the time interval amount two consecutive transmitted packets. the unit is in symbol, the range is from 0 to 255 symbols of zero. 0 symbol s of zero basic advanced push button settings button mode select the button encoding mode , the options are: normal , matrix, toggle and pwm . for 1920 and 1527 format, all these button modes are supported; for 2262 format, only normal button mode is supported. normal basic advanced on/off button(s) select the numbers of on/off button for toggle and pwm button modes , the options are : single or separated. single basic advanced number of button(s) this option is only available in normal button mode, and encoder is set to 1920 and 1527. it defines the number of activated button(s) to be used in the application. the range is from 1 to 7 . 4 basic advanced data inversion allow the user to select whether or not to inverse the transmitted data bits values in the normal and toggle button mode. the options are: no or yes. no advanced periodic transmission turn on/off the periodic transmission mode of the device. the options are: on or off. off advan ced periodic time this parameter is only available when periodic transmission is turned on. it defines the periodic time for transmitting a fixed set of data. the range is from 2 to 7683.512 s, accurate to 3 decimal points. i t is only available when periodic transmission is on. 1.000 s advanced study settings id study turn on/off the sync id study function, the options are: on or off. the id study is only supported in 1920 and 1527 mode. off advanced
cmt21 50aw rev 0.8 | page 15 / 31 www. hoperf.c om category parameters descriptions default mode study trigger time this parameter is only available when id study is turned on. it defines the time from the instance of pressing the study button to the instance at which the device starts to transmit the study packets. the range is from 1 to 15 second(s). 5 s advanced study button this parameter is only available when id study is turned on. it defines which button is used to trigger the transmission of the study packets. the options are the current buttons used in the push button settings. pin 11 (k1) advanced study power this par ameter is only available when id study is turned on. it defines the pa power when the device is transmitting the study packets. the range is from ? 10 to +14 dbm. - 6 dbm basic advanced 5.4 power amplifier a high ly efficien t single - ended power amplifier (pa) is integrated in the cmt 21 50aw to transmit the modulated signal out . depending on the application, the user can design a matching network for the pa to exhibit optimum efficiency at the desired output power for a wide range of antennas, such as loop or mon opole antenna. typical application schematics and the required bom are shown in ?chapter 4 typical application schematic?. for the schematic, layout guideline and the other detail ed information please refer to ?a n1 1 1 cmt21 5x schematic and pcb layout design guideline ?. the output power of the pa can be configured by the user within the range from - 10 dbm to +13 dbm in 1 db step size using the cmostek usb programmer and rfpdk. 5.5 pa ramping when the pa is switched on or off quickly, its changing input impedance momentarily disturbs the vco output frequency. this phenomenon is called vco pulling, and it manifests as spectral splatter or spurs in the output spectrum around the desired carrier f requency. by gradually ramping the pa on and off, pa transient spurs are minimized. the cmt 21 50aw has built - in pa ramping configurability with options of 0, 1, 2, 4, 8, 16, 32, 64, 128, 256, 512 and 1024 us, a s shown in figure 13 . w hen the option is set to ? 0 ? , the pa output power will ramp up to its configured value in the shortest possible time. the ramp down time is identical to the ramp up time in the same configuration. cmostek recommends that the maximum symbol rate should be no higher than 1/2 of the pa ramping ? rate ? , as shown in the formula below: sr max 0.5 * ( 1 t ramp ) i n whi ch the pa ramping ? rate ? is given by (1/t ramp ). i n other words, by knowing the maximum symbol rate in the application, the pa ramping time can be calculated by: t ramp 0.5 * ( 1 sr max ) the user can select one of the values of the t ramp in the available options that meet the above requirement. if somehow the t ramp is set to be longer than ? 0.5 * (1/sr max ) ? , it will possibly bring additional challenges to the ook demodulation of the rx device. f or more detail of calculating t ramp , please refer to ? an1 1 2 cmt 21 50a configuration guideline ? .
cmt21 50aw rev 0.8 | page 16 / 31 www. hoperf.c om time rfo amplitude time data logic 1 logic 0 1024 us 512 us 8 us 4 us 2 us 1 us 0 us figure 13 . pa ramp ing time 5.6 working states t he cmt 21 50aw has following 4 different working states: sleep, xo - startup , tune and transmit . the device stays in the sleep state when no transmission is performed. once the button(s) is/are pressed, the device goes through the sequence of sleep ? xo - startup ? tune ? transmit to transmit the data. after the transmission the device goes back to the sleep state. when the device works in the periodic transmission mode, the device periodically wakes up from the sleep state, goes the same sequence, performs the transmission and goes back to the sleep state. all the details of push button(s) function and periodic transmission can be referred to ? an112 cmt21 50a configuration guideline ? . sleep w hen the cmt 21 50aw is in the sleep state , all the internal blocks are turned off and the current consumption is minimized to 20 na typically . xo - start up once the cmt 21 50aw detects the valid button - pressing event , it will go into the xo - startup state , and the internal xo start s to work. the t xtal is the time for the xo to get stable , it is to a large degree crystal dependent . a typical value of t xtal is provided in the table 11 . tune t he frequency synthesizer will tune the cmt 21 50aw to the desired frequency in the time t tune . t he pa can be turned on to transmit the data generated by the embedded encoder only after the tune state is done . transmit t he cmt 21 50aw start s to modulate and transmi t the data . the data packets being transmitted are generated by the embedded encoder, and they are determined by the encoder selected, the button mode and the button being pressed. table 11 . main timing spec i n different working states parameter symbol min typ max unit xtal startup time [1] t xtal 400 us time to t une to d esired f requency [2] t tune 370 us note s : [1]. this parameter is to a large degree crystal dependent . [2]. from xo stable to ready to transmit .
cmt21 50aw rev 0.8 | page 17 / 31 www. hoperf.c om 5.7 the en coder the device supports 3 types of encoding formats : 1920, 1527 and 2262. the packets of these 3 modes have different structures which will be introduced in below sub - sections. t he t able below summarize s the major features of the 3 encoding format s . table 12. feature summary of the 3 en coding formats format bit format (sym/bit) sync id length (bits) data length (bits) crc id study button mode s [1] 1920 3/4/5/6 1 ? 32 1 ? 7 support support all 1527 4 20 1 ? 7 na support all 2262 8 6 ? 11 1 ? 6 na not support normal mode note: [1]. button modes include normal mode, matrix mode, toggle mode and pwm mode. all the details of these 3 types of encoding formats are given in the document ?an11 2 cmt2 1 50a configuration guideline?. the following sections only give the abstracts of these formats. in the below explanations, s ome elements in the packet are measured in the unit of ?symbol?, while some of them are measured in the unit of ?bit?. for those which h ave the unit of ?bit?, one ?bit? is constructed (encoded) by several ?symbols?. in the figures, ?sym? represents the word ?symbol?. 5.7.1 1920 packet structure two types of packet structures are supported for 1920 format: normal packet and study packet. the fol lowing configurable parameters are shared by the two structures. table 1 3 . configurable parameters in 1920 packet parameter descriptions default mode preamble the size of the valid preamble, the options are: none or 16 - symbol. none basic advanced address (sync id) length the range of the sync id length is from 1 to 32 bits. 32- bit basic advanced address (sync id) value the value of the sync id has the range from 0 to 2 l ength - 1 . 0 basic advanced normal packet the normal packet is used to control the data pins of the cmostek receiver cmt22 50aw or pwm output of the cmt2251 aw . it contains a 16 - symbol preamble, a 32 - symbol head_n (which indicat es that the current packet is a n ormal packet rather than a study packet ) , a sync id, a configurable data field and an 8 - symbol crc. preamble 16 symbols address (sync id) configurable 1-32 bits d0 1 bit d1 1 bit d2 1 bit d3 1 bit crc 8 symbols head_n 32 symbols figure 14 . 1920 normal packet structure study packet the study packet is used fo r the cmt2250 /5 1 aw to learn the sync id from the cmt21 50aw in order to pair the two devices . it contains an optional preamble, a 32 - symbol head_s, a sync id and an 8 - symbol crc.
cmt21 50aw rev 0.8 | page 18 / 31 www. hoperf.c om preamble (optional) 16-symbol crc 8-symbol head_s 32-symbol address (sync id) configurable 1-32 bits figure 15 . 1920 study packet structure bit format in 1920 packet, a single bit can be constructed (encoded) by 3, 4, 5 or 6 sym bols. the user can select the desired value of the ?bit format? parameter on the rfpdk. please note that only the sync id field and the d0, d1, d2, d3 , d4, d5, d6 ha ve the unit of ?bit?. 2 sym 2 sym 1 sym 1 sym bit 1 bit 0 1 sym 1 sym 3 sym 3 sym bit 1 bit 0 3 sym 2 sym bit 1 2 sym 3 sym bit 0 2 sym 1 sym bit 1 1 sym 2 sym 1 sym 1 sym bit 0 1 sym 3 sym 3 symbols/bit 4 symbols/bit 5 symbols/bit 6 symbols/bit figure 16 . 1920 bit format options 5.7.2 1 527 packet structure two types of packet structures are supported for 1527 format: normal packet and study packet. the following configurable param eter is shar ed by the two structures. table 14. configurable parameters in 1527 packet parameter descriptions default mode address (sync id) value the range of the sync id value is from 0 to 2 20 - 1. this is because the sync id length is fixed at 20 for 1527. 0 basic advanced in the traditional 1527 format, 8 osc clocks are equal to 1 lck, 4 lck are equal to 1 symbol. by using the cmt22 50aw pairing with cmt21 50aw , the user does not need to adjust the osc to determine the symbol rate, because the symbol rate is directly programmed. the bit format is fixed at 4 symbols (16 lck) per bit. normal packet the traditional 1527 packet contains a 32- symbol sync , a 20- bit address ( s ync id ) and 4 - bit d ata . cmostek define a 1527 study packet to support the id study in 1527 mode. the traditional packet introduced here is called the ? normal packet ? . address (sync id) configurable 20 bits d0 1 bit d1 1 bit d2 1 bit d3 1 bit sync 32 symbols figure 17 . 1527 normal packet structure
cmt21 50aw rev 0.8 | page 19 / 31 www. hoperf.c om study packet the 1527 study packet contains a 32- symbol head_s and a 20 - bit address ( s ync id ), as shown below. head_s 32-symbol address (sync id) 20 bits figure 18 . 1527 study packet structure bit format in 1527 packet, a single bit is constructed by 4 symbols, as shown below. the user can select the desired value of the ?bit format? parameter on the rfpdk. please note that only the sync id field and the d0, d1, d2, d3 , d4, d5, d6 field h ave the unit of ?b it?. 1 sym 1 sym 3 sym 3 sym bit 1 bit 0 figure 19 . 1527 bit format options 5.7.3 2262 packet structure id study is not supported in 2262 mode. only one packet structure is supported. table 15. configurable parameters in 2262 packet parameter descriptions default mode address (sync id) length this is the range of the sync id length. the range is from 6 to 11 bits. this parameter also defines the number of data bits, because the total number of sync id and data bits is fixed at 12. 8 - bit basic advanced address (sync id) value the value of each bit of the sync id can only be represented by 0, 1 or f. 0 0000000 basic advanced in the traditional 2262 format, 4 osc clocks (1 osc clock cycle is notated as 1 ) are equal to 1 symbol. by using the cmostek products , the user does not need to adjust the osc to define the symbol rate, because the symbol rate is directly programmed. the bit format is fixed at 8 symbols per bit. normal packet the traditional 2262 packet contains a n 8 to 11 - bit address ( s ync id ), a 1 to 4 - bit d ata, and a 32 - symbol sync. address (sync id) configurable 8-11 bits data 4-1 bit(s) sync 32 symbols figure 20 . 2262 packet structure bit format in 2262 packet, a single bit is constructed by 8 symbols, as shown below. please note that only the address (sync id) field and the data field have the unit of bit. in the below diagram, 1 osc clock cycle is notated as 1 referring to the original 22 62 timing descriptions.
cmt21 50aw rev 0.8 | page 20 / 31 www. hoperf.c om 3 sym (12 ) 1 sym (4 ) 3 sym (12 ) 1 sym (4 ) bit 1 3 sym (12 ) 1 sym (4 ) bit 0 3 sym (12 ) 1 sym (4 ) 3 sym (12 ) 1 sym (4 ) bit f 3 sym (12 ) 1 sym (4 ) figure 21 . 2262 bit format options 5.8 id study the id study function, which is supported in 1920 and 1527 modes , allows t he cmt2250 /5 1 aw to receive the sync id sent by the cmt21 50aw and burns it into the local eeprom automatically . since then, the cmt2250/51a w ? s sync id is identical to that of the cmt21 50aw and therefore two devices are paired. the lengths of the sync id are different in the different packet formats. in 1920 format, it is from 1 to 32 bits. in 1527 format, it is fixed at 20 bits. the id study is initialized by the cmt21 50aw . it is done by executing the f ol lowing steps: 1. press the study button on the cmt21 50aw and hold it over the time defined by the ? study trigger time ? . 2. cmt21 50aw starts to transmit the study packets, wait 1 - 2 seconds then release the study button. 3. try to press a certain button on the cmt21 50aw to check if the cmt2250/51 aw react correctly. the figure below shows the timing characteristic after pressing down a study button. the study power is always independently configure d from the tx power. in this example, the study power is set smaller than the tx power. one normal packet packet interval study button pressed time study button released study time (default is 5 s) one study packet packet interval tx power = 0 dbm study power = -6 dbm figure 22 . timing of study button pressing event more information about the id study can be found in the document ? an112 cmt21 50a configuration guideline ? . 5.9 button modes the button modes define the functions of the input pin s k 1 ? k7. t he cmt 21 50aw supports 4 different button modes : normal, matrix, toggle and pwm, which are configured on the rfpdk. the following sections give the abstract of each button mode. all the details of the button mode s are given in the document ? an112 cmt21 50a configuration guideline ? . 5.9.1 normal the normal button mode is supported in 1920, 1527 and 2262 format. in this mode, t he buttons are directly mapped to the d ata field of the packet. multiple buttons can be pressed at the same time. for 1920 and 1527, the largest number of buttons is 7 which are defined by the parameter ? number of button(s) ? . for 2262, the largest number of buttons is 6, which is determined by the sync id length . the figure below gives an example which 4 push button keys are selected.
cmt21 50aw rev 0.8 | page 21 / 31 www. hoperf.c om led vdd gnd rfo k7 k6 k5 xtal clk k0 k1 k2 k3 k4 d0 d1 d2 d3 nc nc nc nc led vdd gnd rfo clk xtal 7 6 5 1 2 3 4 8 9 10 14 13 12 11 figure 23 . normal button mode in normal button mode, the number of button(s) to be used determines the number of data bits in the packet. the table below shows an example that 4 buttons are used an d the pins k 1 ? k 4 are map ped to the data d0 ? d 3, ? 1 ? in the p ush b uttons section means the corresponding button(s) is/are pressed down , w hile the ?1? in the data bits section means a logic ?1? to be transmitted. table 16. mappi ng from k 1 - k 4 to d0 - d3 in normal button mode push buttons the data bits k 1 k 2 k 3 k 4 d0 d1 d2 d3 1 0 0 0 1 0 0 0 0 1 0 0 0 1 0 0 1 1 0 0 1 1 0 0 0 0 1 0 0 0 1 0 1 0 1 0 1 0 1 0 0 1 1 0 0 1 1 0 1 1 1 0 1 1 1 0 0 0 0 1 0 0 0 1 1 0 0 1 1 0 0 1 0 1 0 1 0 1 0 1 1 1 0 1 1 1 0 1 0 0 1 1 0 0 1 1 1 0 1 1 1 0 1 1 0 1 1 1 0 1 1 1 1 1 1 1 1 1 1 1 5.9.2 matrix the matrix button mode is supported in 1920 and 1527 format. in t he matrix button mode, the number of buttons is fixed at 5. on the rfpdk, it can be seen that the 5 buttons are assigned to pin 11 (k1) ? pin 7 (k5). in this mode, at most two buttons can be pressed at the same time. t he figure below gives an example of matrix mode push button arrangement.
cmt21 50aw rev 0.8 | page 22 / 31 www. hoperf.c om led vdd gnd rfo k7 k6 k5 xtal clk k0 k1 k2 k3 k4 b0 b1 b2 b3 nc b4 nc nc led vdd gnd rfo clk xtal 7 6 5 1 2 3 4 8 9 10 14 13 12 11 figure 24 . matrix button mode (button ? b) the user is able to use the 5 buttons k1 (b0) ? k5 ( b 4) to generate different combinations of the data d0 ? d3 to be transmitted. the number of data bits to be transmitted is fixed at 4. the table below shows the matrix. for the k1 ? k5 buttons, ?1? in the push buttons section means the corresponding button(s) is/ar e pressed down , w hile the ?1? in the data bits section means a logic ?1? to be transmitted. table 17. mapping from k1 - k5 to d0 - d3 in matrix button mode push buttons the data bits k1 k2 k3 k4 k5 d0 d1 d2 d3 1 0 0 0 0 1 0 0 0 0 1 0 0 0 0 1 0 0 0 0 1 0 0 1 1 0 0 0 0 0 1 0 0 0 1 0 0 0 0 0 1 1 0 1 0 1 1 0 0 0 0 1 1 0 1 0 1 0 0 1 1 1 0 1 0 0 1 0 0 0 0 1 1 0 0 0 1 1 0 0 1 0 1 1 0 0 0 1 0 1 0 1 0 1 0 1 1 0 1 0 1 0 0 1 0 0 1 1 0 0 1 1 0 1 0 1 1 0 0 1 0 1 0 1 1 1 0 0 0 1 1 1 1 1 1 5.9.3 toggle the toggle button mode is supported in 1920 and 1527. in this mode, 5 or 6 buttons are used. four buttons directly mapped to the data d0 ? d3 are used to control the data. besides, a single button or two separated buttons used to turn on/off the data can b e chosen by the parameter ? on/off button(s) ? . in this mode, only one button can be pressed at the same time. pin 12 (k0) and pin 5 (k7) are never used in this mode. t he figure below gives examples of the pin functions in toggle mode.
cmt21 50aw rev 0.8 | page 23 / 31 www. hoperf.c om led vdd gnd rfo k7 k6 k5 xtal clk k0 k1 k2 k3 k4 nc on off d0 d1 d2 d3 nc led vdd gnd rfo clk xtal 7 6 5 1 2 3 4 8 9 10 14 13 12 11 led vdd gnd rfo k7 k6 k5 xtal clk k0 k1 k2 k3 k4 nc on/off nc d0 d1 d2 d3 nc led vdd gnd rfo clk xtal 7 6 5 1 2 3 4 8 9 10 14 13 12 11 figure 25 . toggle button mode with single (left) and separated (right) on/off button(s) for the 4 data buttons mapped to d0 ? d3, every time a button is pressed, the generated data bit toggles. for examp le, if the default value of d1 is 0, press k4 down, the d1 is set to 1 in the current transmission, release the k4 and press it down again, the d1 is set to 0 in the current transmission, and so on. this is what it means by ? toggle ? . s ee the table below for the examples of toggle button mode . table 18. examples of the toggle button mode on/off button(s) pressed button (times) d0 d1 d2 d3 single (k1 is on/off) press k4 (d1) ? 1 st time 0 1 0 0 press k4 (d1) ? 2 nd time 0 0 0 0 press k4 (d1) ? 3 rd time 0 1 0 0 press k1 ? 1 st time (on) 1 1 1 1 press k1 ? 2 nd time (off) 0 0 0 0 press k1 ? 3 rd time (on) 1 1 1 1 separated (k1 is on k2 is off) press k4 (d1) ? 1 st time 0 1 0 0 press k4 (d1) ? 2 nd time 0 0 0 0 press k4 (d1) ? 3 rd time 0 1 0 0 press k1 (on) 1 1 1 1 press k2 (off) 0 0 0 0 press k1 (on) 1 1 1 1 5.9.4 pwm the pwm button mode is only supported for 1920 and 1527 encod ing format . in this mode, 2 buttons are used to send out commands to increase or decrease the duty ratio of the pwm output of the cmt2251 aw . a single on/off button, or two separated on/off buttons can be chosen by the parameter ? on/off button(s) ? . the ? on ? command sets the pwm output of the cmt2251 aw to 100% of duty ratio, while the ? off ? command sets the pwm output to 0% of duty ratio. in this mode, only one button can be pressed at the same time. pin 12 (k0), pin 9 (k3), pin 6 (k6) and pin 5 (k7) are never used in this mode. the commands of on, off, increase and decrease are represented by d0 ? d3 . t he figure below gives examples of the pin functions in pwm mode.
cmt21 50aw rev 0.8 | page 24 / 31 www. hoperf.c om led vdd gnd rfo k7 k6 k5 xtal clk k0 k1 k2 k3 k4 nc on/off nc nc inc dec nc nc led vdd gnd rfo clk xtal 7 6 5 1 2 3 4 8 9 10 14 13 12 11 led vdd gnd rfo k7 k6 k5 xtal clk k0 k1 k2 k3 k4 nc on/off off nc inc dec nc nc led vdd gnd rfo clk xtal 7 6 5 1 2 3 4 8 9 10 14 13 12 11 figure 26 . pwm button mode with single (left) and separated (right) on/off button(s) if k1 is used as the on/off button, press it down once, the ? on ? command is transmitted, release and press it down again, the ? off ? command is transmitted, and so on. in this case, k1 is a ? toggle ? button. if the k1 is used as the on button and k2 is used as the off button, pressing k1, the ? on ? command is transmitted; pressing k2, the ? off ? command is transmitted. 5.10 led driving capability this defines the maximum current driving capacity o n the led pin. once the led pin is enabled, it will light up or flash to indicate two events : ? when the chip is transmitting data, the led will light up until the transmission is finished to notif y the user the chip is working , when the lbd is disabled , or lbd is enabled but there is no low battery detected. ? when the lbd is enabled and there is valid low battery detection on the button(s) pressing, the led will flash at least 5 times at the frequency of 6 hz to notify the user the battery is running out. 5.11 l ow battery detection (lbd) this defines the low battery detection threshold. once the lbd is enabled, the chip will automatically check the battery stat us before each transmission. once the chip finds that the battery output is less than the detection threshold, the led will flash at least 5 times at the frequency of 6 hz to notify the user. once the led flashes, the performance of the transmission is not guaranteed . the user should change the batteries to new ones. 5.12 crystal oscillator and rclk t he cm t 21 50aw uses a 1 - pin crystal oscillator circuit with the required crystal load capacitance integrated on - chip . figure 27 shows the configuration of the xtal c ircuitry and the crystal model. the recommended specification for the crystal is 26 mhz with 20 ppm, esr (rm) < ordgfdsdflwdqfh& lo ad ranging from 12 to 20 pf. to save the external load capacitors, a set of variable load capacitors c l is built in side the cmt 21 50aw to support the oscillation of the crystal . t he value of load capacitors is configurable with the cmostek usb programmer and rfpdk. to achieve the best performance, the user only needs to input the desired value of the xtal load capacita nce c load of the crystal (can be found in the datasheet of the crystal) to the rfpdk , then fine ly tune the required xo load capacitance according to the actual xo frequency. please refer to ? an1 1 3 cmt 21 50a / 2250 (1) a one - way rf link development kits user?s guide? f or the method of choosing the right value of c l .
cmt21 50aw rev 0.8 | page 25 / 31 www. hoperf.c om cmt2150aw xtal crystal model rm cm c l c0 lm cmt 2150 aw xtal c l rclk 26 mhz cc 0 . 3 C 0 . 7 vpp if a 26 mhz rclk (reference clock) is available in the system, the user can directly use it to drive the cmt 21 50aw by feed ing the clock into the chip via the xtal pin. this further sav es the system cost due to the removal of the crystal. a coupling capacitor is required if the rclk is used. the recommended amplitude of the rclk is 0.3 to 0.7 vpp on the xtal pin. also, the user should set the internal load capacitor c l to its minimum value. see figure 28 for the rclk circuitry . figure 28 . rclk circuitry figure 27 . xtal circuitry and crystal model
cmt21 50aw rev 0.8 | page 26 / 31 www. hoperf.c om 6. ordering information table 19 . cmt21 50 aw ordering information part number descriptions package type package option operating condition moq / multiple cmt21 50aw - esr [1] 240 ? 480 mhz ook stand - alone transmitter with encoder so p14 tape & reel 1.8 to 3.6 v, - 40 to 85 2 , 5 00 cmt21 50aw - esb [1] 240 ? 480 mhz ook stand - alone transmitter with encoder so p14 tube 1.8 to 3.6 v, - 40 to 85 1,000 note : [1]. ?e? stands for extended industrial product grade, which supports the temperature range from - 40 to +85 . ?s? stands for the package type of so p14 . ?r? stands for the tape and reel package option, the minimum order quantity (moq) for this option is 2 , 5 00 pcs. ? b ? stands for the tube package option, with the moq of 1,000 pcs. t he default frequency for cmt21 50aw is 433.92 mhz, for the other settings, pl ease refer to the table 10 of page 13. visit www.cmostek.com/products to know more about the product and product line. contact sales@cmostek.com or your local sales representatives for more information.
cmt21 50aw rev 0.8 | page 27 / 31 www. hoperf.c om 7. package outline c h 0.25 l l1 a1 a3 a2 a d b e e1 e figure 29 . 14 - pin s op package table 20. 14- pin so p package dimensions symbol size (millimeters) min typ max a - - 1.75 a1 0.05 - 0.225 a2 1.30 1.40 1.50 a3 0.60 0.65 0.70 b 0.39 - 0.48 c 0.21 - 0.26 d 8.45 8.65 8.85 e 5.80 6.00 6.20 e1 3.70 3.90 4.10 e 1.27 bsc h 0.25 - 0.50 l 0.30 - 0.60 l1 1.05 bsc 0 - 8
cmt21 50aw rev 0.8 | page 28 / 31 www. hoperf.c om 8. top marking 8.1 cmt 21 50aw top marking c m t 2 1 5 0 a y y w w figure 30 . cmt21 50 aw top marking table 21 . cmt21 50 aw top marking explanation mark method : laser pin 1 mark : circle?s diameter = 1 mm font size : 0. 35 mm, right - justified line 1 marking : cmt21 50a , represents part number cmt21 50aw line 2 marking : yyww is the date code assigned by the assembly house. yy represents the last two digits of the mold year and ww represents the workweek ????? is the internal tracking number
cmt21 50aw rev 0.8 | page 29 / 31 www. hoperf.c om 9. other documentations table 22 . other d ocumentations for cmt21 50 aw brief name description s an1 1 1 cmt21 5 x schematic and pcb layout design guideline detail s of cmt21 5 0 /57 aw pcb schematic and layout design rules, rf matching network and other application layout design related issues. an1 1 2 cmt21 50a configuration guideline detail s of configuring cmt21 50aw features on the rfpdk. an 1 1 3 cmt21 50a /22 5 0 (1) a one - way rf link development kits user?s guide user ? s guides for cmt21 50aw /22 5 0 (1) aw development kits, including evaluation board and evaluation module , cmostek usb programmer and rfpdk. an115 pairing cmt215 x and cmt225 x provide quick guideline in how to pair the cmt2150 /57 aw with cmt2250 /51 aw .
cmt21 50aw rev 0.8 | page 30 / 31 www. hoperf.c om 10. document change list table 23. document change list rev. no. chapter description of changes date 0.8 a ll initial released version 2015 - 02- 11
cmt21 50aw rev 0.8 | page 31 / 31 www. hoperf.c om 11. contact information hope microelectronics co., ltd address: 2/f,building3,pingshan private enterprise science and technology park,xili town,nanshan district,shenzhen,china tel: +86 - 755 - 82973805 fax: +86 - 755- 82973550 email: sales@hoperf.com hoperf@gmail.com website: http://www.hoperf.com http://www.hoperf.cn the information furnished by cmostek is believed to be accurate and reliable. however, no responsibility is assumed for inaccuracies and specifications within this document are subject to change without notice. the material contained herein is the exclusive property of cmostek and shall not be d istributed, reproduced, or disclosed in whole or in part without prior written permission of cmostek. cmostek products are not authorized for use as critical components in life support devices or systems without express written approval of cmostek. the cmo stek logo is a registered trademark of cmostek microelectronics co., ltd. all other names are the property of their respective owners. copyright. cmostek microelectronics co., ltd. all rights are reserved.

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