ts3001 page 1 ? 2012 touchstone semiconductor, inc. all rights reserved. features ? ultra low supply current: 1a at 25khz ? sup ply voltage operation: 0.9v to 1.8 v ? programmable frequency range: o 5.2khz out 90khz ? fout period drift: 0.021 %/ c ? pwmout duty cycle range: 1 2 % to 90% ? single resistor set s output frequency ? outpu t driver resistance: 1 6 0? applications portable and battery - powered equipment low - parts - count nanopower oscillator compact nanopower replacement for crystal and ceramic oscillators nanopower pulse - width modulation control nanopower pulse - position modulation control nanopower clock generation nanopower sequential timing description the ts3001 is a single - supply cmos oscillator fully specified to operate at 1v while consuming a 1a supply current at an output frequency of 25khz. this oscillator is compact, easy - to - use, and versatile. optimized for ultra - long life, battery - powered applications, the ts3001 joins touchstones ts3002 cmos oscillator in the nanowatt nalog? high - per formance analog integrated circuits portfolio. t he ts3001 can operate from singl e - supply voltages from 0.9v to 1.8 v. requiring only a resistor t o set the output frequency, the ts3001 represent s a 66% reduction in pcb area and a factor - of - 10 reduction in p ower consumption over other cmos - based integrated circuit oscillators. when compared against industry - standard 555 - time r - based products, the ts3001 offer s up to 93% reduction in pcb area and four orders of magnitude lower power consumption. the ts3001 is fully specified over the - 40c to +85c temperature range and is available in a low - profile, 8 - pin 2x2mm tdfn package with an exposed back - side paddle . a 1v/1a easy - to - use resistor - tuned silicon oscillator/timer typical application circuit t he touchstone semicondu c tor logo and nanowatt nalog are registered t rademark s of touchstone semiconductor, incorporated. table 1: fout vs r set r set (m ? ) fout (khz) 1 110 2.49 44 4.32 25.5 6.81 16 9.76 11
ts3001 page 2 ts3001ds r1p0 rtfds absolute maximum rat ings v dd to gnd ................................ ................................ .. - 0.3v to +2 v v cntrl to gnd ................................ .............................. - 0.3v to +2v rset to gnd ................................ .............................. - 0.3v to +2v f out , pwmout to gnd ................................ ............ - 0.3v to +2 v short circuit duration fout, pwmout to gnd or v dd ................................ ................................ ................ continuous continuous power dissipation (t a = +70c) 8 - pin tdfn ( derate at 23.8 mw/c above +70c) ....... 1951 mw operating temperature range ................................ - 40c to +85c storage temperature range ................................ . - 65c to +150c lead temperature (s oldering, 10s) ................................ ..... +300c electrical and thermal s tresses beyond those listed under bsolute maximum atings may cause permanent damage to the device. these are stress ratings only and functional operation of the device at these or any other condition beyond those indicated in the operational sections of the specifications is not implied. exposure to any absolute maximum rating conditions for extended p eriods may affect device reliability and lifetime . package/ordering information order number part marking carrier quantity ts3001 itd822tp aa g tape & reel ----- ts3001 itd822t tape & reel 3000 lead - free program: touchstone semico nductor supplies only lead - free packaging. consult touchstone semiconductor for products specified with wider operating temperature ranges.
ts3001 ts3001ds r1p0 page 3 rtfds electrical character istics v dd = 1 v, v cntrl = v dd , r set = 4.32m? load(fout) = open circuit, c load(fout) = 0pf, c load(pwm) = 0pf unless otherwise noted. v alues are at t a = 25c unless otherwise noted. see note 1. parameter symbol conditions min typ max units supply voltage v dd 0.9 1 1.8 v supply current i dd 1 1.5 a - 40c t a 85c 2.8 v cntrl = 0.15 x v dd 2.1 3.7 - 40c t a 85c 5.4 fout period t fout 38.5 41.6 s - 40c t a 85c 36.8 44.6 fout period line regulation t fout /v 1v v dd 1.8 v 1.8 %/v fout period temperature coefficient t fout /t 0.0 21 %/c pwmout duty cycle dc(pwmout) v cntrl = 0.03 x v dd 6 10.5 15 % v cntrl = 0.15 x v dd 45 49.8 54.2 v cntrl = 0.27 x v dd 84 91 98 fout, pwmout rise time t rise see note 2, c l = 15pf 8.6 ns fout, pwmout fall time t fall see note 2, c l = 15pf 7.9 ns fout jitter see note 3 0.08 % rset pin voltage v(rset) 0.3 v cntrl output current i cntrl 25 45 na - 40c t a 85c 100 pwmout enable v pwm_en ( v dd - v cntrl ), 0.9v < v dd < 1.8v 375 mv pwmout disable v pwm_dis ( v dd - v cntrl ), 0.9v < v dd < 1.8v 131 mv high level output voltage, fout and pwmout v dd - v oh i oh = 1ma 160 mv low - level output voltage, fout and pwmout v ol i ol = 1ma 140 mv note 1: all devices are 100% production tested at t a = +25c and are guaranteed by characterization for t a = t min to t max , as specified. note 2: output rise and fall times are measured between the 10% and 90% of the v dd power - supply voltage levels. the specification is based on lab bench characterization and is not tested in production. note 3 : timing jitter is the ratio of the peak - to - peak variation of the period to the mean of the period. the specification is based on lab bench characterization and is not tested in production.
ts3001 page 4 ts3001ds r1p0 rtfds period - s supply current - a 40 80 1.5 0.5 supply current vs fout period 0 120 2 2.5 1 160 200 supply voltage - volt period - s 1.05 1.2 39.8 39.6 40.4 fout period vs supply voltage 0.9 1.35 40 40.2 1.5 c load - pf supply current - a 10 20 1.2 0.8 1.8 supply current vs c load(fout) 0 30 1.4 1.6 1 40 2 1.65 1.8 temperature - oc supply current - a 1.08 0.8 supply current vs temperature 1.22 1.36 0.94 1.5 - 15 10 - 40 35 60 85 supply voltage - volt start - up time - ms 1.2 1.24 1.1 1.66 start - up time vs supply voltage 0.9 1.38 1.52 1.5 1.8 1.8 temperature - oc period - s - 15 10 39.5 39 fout period vs temperature - 40 35 40 60 85 40.5 41 typical performance characteristics v dd = 1 v, v cntrl = v dd , r set = 4.32m? load(fout) = open circuit, c load(fout) = 5pf, unless otherwise noted. v alues are at t a = 25c unless otherwise noted.
ts3001 ts3001ds r1p0 page 5 rtfds typical performance characteristics v dd = 1 v, v cntrl = v dd , r set = 4.32m? load(fout) = open circuit, c load(fout) = 5pf, unless otherwise noted. v alues are at t a = 25c unless otherwise noted. r set - m period - s 4 8 80 0 200 period vs r set 0 12 120 160 40 16 20 percent of units - % supply current - a 0% supply current distribution 0.97 5% 10% 15% 20% 25% 30% 35% 0.99 1.01 1.03 fout and pwmout transient response v dd = 1v, v cntrl = 0.03 5 x v dd , c load = 22pf 5s/div fout 500mv/div pwmout 500mv/div fout and pwmout transient response v dd = 1 .5 v, v cntrl = 0.03 5 x v dd , c load = 22pf 5s/div fout 1v/div pwmout 1v/div fout transient response v dd = 1v, c load = 47 pf 5s/div fout transient response v dd = 1.5v, c load = 47 pf 5s/div fout 500mv/div fout 200mv/div
ts3001 page 6 ts3001ds r1p0 rtfds pin functions pin name function 1 fout fixed duty cycle output. a push - pull output stage with an output resistance of 160 ? the out pin swings from gnd to v dd . for lowest power operation, capacitive loads should be minimized and resistive loads should be maximized. 2 nc no connection. 3 pwmout pulse - width modulated output. a push - pull output stage with an output resistance of 1 60 ? the pwmout pin is wired anti - phase with respect to fout and swings from gnd to v dd . for lowest power operation, capacitive loads should be minimized and resistive loads should be maximized. 4 cntrl pwmout enable and duty cycle control input. an analog input pin, the v cntrl pin voltage enables the ts3001 s pwm engine and controls the duty cycle at pwmout from 12% (v cntrl = 0.03 x v dd ) to 90% (v cntrl = 0.27 x v dd ). enabling the pwm engine increases the ts3001 s nominal operating supply current. to disable the t s3001 s pwm engine ntl shall be connected to v dd . 5, 6 gnd ground C onnect this pin to the systems analog ground plane. 7 rset out programming esistor input. 4.32m resistor connected from this pin to gnd sets the ts3001 s internal oscillators output period to 40s (25khz). or optimal performance the composition of the rset resistor shall be consistent with tolerances of 1% or lower. the rset pin voltage is 0.3v at a 1v supply. 8 vdd power supply voltage input. while the ts3001 is fully specified at 1v the supply voltage range is 0.9v v dd 1.8v. it is always considered good engineering practice to bypass the v dd pin with a 0.1 ceramic decoupling capacitor in close proximity to the ts3001 . ep ----- exposed paddle is electrically connected to gnd .
ts3001 ts3001ds r1p0 page 7 rtfds block diagram theory of operation the ts3001 is a user - programmable oscillator where the period of the square wave at its f out terminal is generated by an exte rnal resistor . the output frequency is given by: out ( khz ) = 1 t out ( s ) 1 k x t m? where th e scalar k is approximately 9.09e3 . with an r set = 4.32m ? , the output frequency is approximately 25khz with a 50% duty cycle. as design aids, tables 1 lists ts3001 s typical fout for various standard values for r set . the ts3001 also provides a separate pwm output signal at its pwmout terminal that is anti - phase with respect to fout. in addition, applying a voltage at the cntrl both enables the ts3001 s internal pwm engine as well as adjusting the duty cycle from 12% to 90%. a dc control voltage equal to 0.03 x vdd applied to the cnt rl pin enables the pwm engine to set the duty cycle to 12%. a dc control voltage equal to 0.27 x vdd increases the duty c ycle to 90% and connecting cntrl to vdd disables the pwm engine altogether . configured for nom inal operation (pwm engine off), the supply current of the ts3001 is 1 a; enabling the pwm engine increases the ts3001 operating supply current as shown in the el ectrical specification table. table 1: fout vs r set r set (m ? ) fout (khz) 1 110 2.49 44 4.32 25.5 6.81 16 9.76 11
ts3001 page 8 ts3001ds r1p0 rtfds applications information minimizing power consumption to keep the ts3001 s power consumption low resistive loads at the fout and pwmout terminals increase dc power consumption and therefore should be as large as possible. capacitive loads at the fout and pwmout terminals increase the ts3001 s transient power consumption and as well, should be as small as possible. one challenge to minimizing the ts3001 s transient power consumption is the probe capacitance of oscilloscopes and frequen cy counter instruments. most instruments exhibit an input capacitance of 15pf or more. unles s buffered, the increase in transient load current can be as much as 4 00n a. to minimize capacitive loading, the technique shown in figure 1 can be used. in this circuit, the principle of series - connected capacitors can be used to reduce the effective capacitive load at the ts3001 s out and pwmout terminals. to determine the optimal value for c ext once the probe capacitance is known by simpl y solving for c ext using the following expression: t = 1 1 lo ( ) 1 po or example if the instruments input probe capacitance is 15pf and the desired effective load capacitance at either or both fout and pwmout terminals is to be 5pf, then the value of c ext should be 7.5p. ts3001 start - up time as the ts3001 is powered up, it s fout terminal (and pwmout terminal, if enabled) is active once the applied vdd is higher than 0.9 volt. once the applied vdd is higher than 0.9 volt, the master oscillator achieves steady - state operation within 1.2 ms. current - and voltage - controlled oscillators the ts3001 can be configured into a current - controlled oscillator as shown in figure 2 . with a current source sourcing a current of 223na to 262na, fout can generate an output signal with a frequency range of 5.2khz to 90khz. in a similar manner, a volt age - controlled oscillator can be configured as shown in figure 3 . in this case, a voltage source sourcing a voltage of 290mv to 341mv can generate an fout output signal frequency range of 5.2khz to 90khz as well. it is recommended to use resi stor values wi th a 1% tolerance. figure 1 : using an external capacitor in series with probes reduces effective capacitive load. figure 2 : configuring the ts3001 into a current - controlled oscillator. figure 3 : configuring the ts3001 into a voltage - controlled oscillator.
ts3001 ts3001ds r1p0 page 9 rtfds using a potentiometer to trim the ts3001 s output frequency by using a fixed resistor and a potentiometer, the output frequency of the ts3001 can be trimmed as shown in figure 4. by selecting a fixed resistor r1 with a tolerance of 0.1% and a potentiometer p1 with a 5% tolerance, the output frequency can be trimmed to provide a 2% trim ming range. as shown in figure 4, r1+p1 set the outpu t frequency to 25.052khz when p1 = 0 and with p1 =200k the resulting output frequency is 24.024khz. using standard resistors to increase fout resolution the ts3001 can be configured to provide a 0.1% resolution on the output frequency as shown in figure 5. to do so, r1 can be set to approximately 10% of the value selected for r2. in addition, r2 and r1 should be chosen with a 0.1% and 1% tolerance, respectively. sin ce r2 is 90% of the total resistance, it has the largest impact on the resolution of the output frequency. with 1 = 91k and 2 = 910k the output frequency is 90khz and with 1 = 400k and 2 = 4m the output frequency is 23kh z. figure 4: using a fixed resistor and a potentiometer to trim the t3001s figure 5: setting the t3001s output
ts3001 touchstone semiconductor, inc. page 10 630 alder drive, milpitas, ca 95035 ts3001ds r1p0 +1 (408) 215 - 1220 ? www.touchstonesemi.com rtfds p ackage outline drawing information furnished by touchstone semiconductor is believed to be accurate and reliable. however, touchstone semiconductor does not assume any responsibility for its use nor for an y infringements of patents or other rights of third parties that may result from its use , and all information provided by touchstone semiconductor and its suppliers is provided on an as is basis, without warranty of any kin d . touchstone semiconductor reser ves the right to change product specifications and product descriptions at any time without any advance notice. no license is granted by implication or otherwise under any patent or patent rights of touchstone semiconductor. touchstone semiconductor assume s no liability for applications assistance or customer product design. customers are responsible for their products and applications using touchstone semiconductor components. to minimize the risk associated with customer products and applicatio ns, custome rs should provide adequate design and operating safeguards. trademarks and registered trademarks are the property of their respective owners. bottom view side view note: all dimensions are in mm. compliant with jedec mo - 229 8 - pin tdfn22 package outline drawing (n .b., drawings are not to scale)
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