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d a t a sh eet product speci?cation supersedes data of september 1993 file under integrated circuits, ic16 1997 apr 16 integrated circuits PCF1174C 4-digit static lcd car clock
1997 apr 16 2 philips semiconductors product speci?cation 4-digit static lcd car clock PCF1174C features internal voltage regulator is electrically programmable for various lcd voltages time calibration is electrically programmable (no trimming capacitor required) lcd voltage adjusts with temperature for good contrast 4.19 mhz oscillator 12-hour or 24-hour mode operating ambient temperature: - 40 to +85 c 40-lead plastic smd, face down (vso40). general description the PCF1174C is a single chip, 4.19 mhz cmos car clock circuit providing hours, minutes and seconds functions. it is designed to drive a 4-digit static liquid crystal display (lcd). two external single-pole, single-throw switches will accomplish all time setting functions. time calibration and voltage regulator are electrically programmable via an on-chip eeprom. the circuit is battery-operated via an internal voltage regulator and an external resistor. ordering information notes 1. see fig.1 and chapter package outline for pin layout and package details. 2. see chapter chip dimensions and bonding pad locations for pad layout and package details. type number package name description version PCF1174Ct vso40 plastic very small outline package; 40 leads; face down (1) sot158-2 PCF1174Cu - uncased chip in tray (2) -
1997 apr 16 3 philips semiconductors product speci?cation 4-digit static lcd car clock PCF1174C pinning symbol pin description bp 1 backplane output pm 2 segment driver am 3 segment driver adeg1 4 segment driver c1 5 segment driver e2 6 segment driver d2 7 segment driver c2 8 segment driver e3 9 segment driver c3 10 segment driver e4 11 segment driver d4 12 segment driver c4 13 segment driver b4 14 segment driver s1 15 hour adjustment input data 16 eeprom data input osc in 17 oscillator input osc out 18 oscillator output v ss 19 negative supply mode 20 12/24-hour mode select input v pp 21 programming voltage input ts 22 test speed-up mode input enable 23 set enable input for s1 and s2 v dd 24 positive supply voltage flash 25 colon option input sel 26 eeprom select input s2 27 minute adjustment input a4 28 segment driver f4 29 segment driver g4 30 segment driver b3 31 segment driver ad3 32 segment driver f3 33 segment driver g3 34 segment driver col 35 segment driver b2 36 segment driver a2 37 segment driver f2 38 segment driver g2 39 segment driver b1 40 segment driver fig.1 pin configuration, PCF1174Ct, (vso40). v 1 2 3 4 5 6 7 8 9 10 11 12 13 40 39 38 37 36 35 34 33 32 31 30 29 28 27 14 15 16 17 18 19 20 21 22 23 24 25 26 PCF1174Ct bp pm am adeg1 c1 e2 d2 c2 e3 c3 e4 d4 c4 b4 s1 data osc in osc out ts flash sel s2 a4 f4 g4 b3 ad3 f3 g3 col b2 a2 f2 g2 enable b1 msa991 mode v ss pp v dd
1997 apr 16 4 philips semiconductors product speci?cation 4-digit static lcd car clock PCF1174C functional description and testing outputs the circuit outputs static data to the lcd. generation of bp and the output signals are shown in fig.4. the average voltages across the segments are: 1. v on(rms) =v dd 2. v off(rms) =0v. fig.2 segment designation of lcd. msa992 a2 g2 d2 f2 e2 b2 c2 p1 (p3) p2 (p4) a3 g3 d3 f3 e3 b3 c3 a4 g4 d4 f4 e4 b4 c4 am pm a1 g1 d1 e1 b1 c1 fig.3 typical displays. a. 12-hour mode. b. 24-hour mode. pm time msa993 (a) msa994 time (b) fig.4 backplane and output signals. msa996 v dd 0 bp v dd 0 off v dd 0 on segment 15.625 ms
1997 apr 16 5 philips semiconductors product speci?cation 4-digit static lcd car clock PCF1174C lcd voltage (see fig.5) the adjustable voltage regulator controls the supply voltage (see section lcd voltage programming) in relation to temperature for good contrast, for example when v dd = 4.5 v at +25 c, then: v dd = 3 to 4 v at +85 c. v dd = 5 to 6 v at - 40 c. fig.5 regulated voltage as a function of temperature (typical). (1) programmed to 4.0 v at 25 c (value within the specified operating range). (2) programmed to 4.5 v at 25 c (value within the specified operating range). (3) programmed to 5.0 v at 25 c (value within the specified operating range). 40 0 40 120 - 8 - 6 - 2 0 - 4 msa995 80 t ( c) o v ss (v) (2) (1) (3)
1997 apr 16 6 philips semiconductors product speci?cation 4-digit static lcd car clock PCF1174C 12/24-hour mode operation in 12-hour or 24-hour mode is selected by connecting mode to v dd or v ss respectively. power-on after connecting the supply, the start-up mode is: 1:00 am; 12-hour mode. 0:00; 24-hour mode. colon if flash is connected to v dd the colon pulses at 1 hz. if flash is connected to v ss the colon is static. time setting switch inputs s1 and s2 have a pull-up resistor to facilitate the use of single-pole, single-throw contacts. a debounce circuit is incorporated to protect against contact bounce and parasitic voltages. set enable inputs s1 and s2 are enabled by connecting enable to v dd or disabled by connecting to v ss . set hours when s1 is connected to v ss the hours displayed advances by one and after one second continues with one advance per second until s1 is released (auto-increment). set minutes when s2 is connected to v ss the time displayed in minutes advances by one and after one second continues with one advance per second until s2 is released (auto-increment). in addition to minute correction, the seconds counter is reset to zero. segment test/reset when s1 and s2 are connected to v ss , all lcd segments are switched on. releasing switches s1 and s2 resets the display. no reset occurs when data is connected to v ss (overlapping s1 and s2). test mode when ts is connected to v dd , the device is in normal operating mode. when connecting ts to v ss all counters (seconds, minutes and hours) are stopped, allowing quick testing of the display via s1 and s2 (debounce and auto-increment times are 64 times faster). ts has a pull-up resistor but for reasons of safety it should be connected to v dd . eeprom v pp has a pull-up resistor but for reasons of safety it should be connected to v dd . lcd voltage programming to enable lcd voltage programming, sel is set to open-circuit and a level of v dd - 5 v is applied to v pp (see fig.6). the first pulse (t e ) applied to the data input clears the eeprom to give the lowest voltage output. further pulses (t l ) will increment the output voltage by steps of typically 150 mv (t amb =25 c). for programming, measure v dd - v ss and apply a store pulse (t w ) when the required value is reached. if the maximum number of steps (n = 31) is reached and an additional pulse is applied the voltage will return to the lowest value. time calibration to compensate for the tolerance in the quartz crystal frequency which has been positively offset (nominal deviation +60 10 - 6 ) by capacitors at the oscillator input and output, a number (n) of 262144 hz pulses are inhibited every second of operation.
1997 apr 16 7 philips semiconductors product speci?cation 4-digit static lcd car clock PCF1174C the number (n) is stored in a non-volatile memory which is achieved by the following steps (see fig.6): 1. set sel to v ss and a level of v dd - 5 v to v pp 2. the quartz-frequency deviation d f/f is measured and (n) is calculated (see table 1) 3. a first pulse t e is applied to the data input clears the eeprom to give the highest backplane frequency 4. the calculated pulses (n) are entered in (t h , t l ). if the maximum backplane period is reached and an additional pulse is applied the period will return to the lowest value. 5. the backplane period is controlled and (when correct) fixed by applying the store pulse t w 6. release sel and v pp . table 1 time calibration ( d t = 3.81 m s; sel at v ss ) oscillator-frequency deviation d f/f ( 10 - 6 ) number of pulses (n) backplane period (ms) 0 0 15.625 +3.8 1 15.629 +7.6 2 15.633 +11.4 3 15.636 ... ... ... +117.8 31 15.743
1997 apr 16 8 philips semiconductors product speci?cation 4-digit static lcd car clock PCF1174C fig.6 programming diagram. msa997 PCF1174C sel v dd osc out osc in v ss 12 v r 6.8 k w c 47 m f ext v ss data v pp pulse generators 0 v t , t = 4 to 6 ms w e t = 1 m s h t = 1 to 1.5 m s l t e t h t l t h t l v dd t h t w n clears cells incrementing counters store pulse 5 v v dd data v pp v dd 5 v v dd 50 m s 50 m s 50 m s 50 m s
1997 apr 16 9 philips semiconductors product speci?cation 4-digit static lcd car clock PCF1174C limiting values in accordance with the absolute maximum rating system (iec 134). note 1. connecting the supply voltage with reverse polarity, will not harm the circuit, provided the current is limited to 10 ma by the external resistor. handling inputs and outputs are protected against electrostatic discharges in normal handling. however, to be totally safe, it is advisable to take handling precautions appropriate to handling mos devices. advice can be found in data handbook ic16, general, handling mos devices . symbol parameter conditions min. max. unit v dd supply voltage with respect to v ss - 8v i dd supply current v ss = 0 v; note 1 - 3ma v i input voltage all pins except v pp and data - 0.3 v dd + 0.3 v pins v pp and data - 3v dd + 0.3 v t amb operating ambient temperature - 40 +85 c t stg storage temperature - 55 +125 c
1997 apr 16 10 philips semiconductors product speci?cation 4-digit static lcd car clock PCF1174C characteristics v dd =3to6v; v ss =0v; t amb = - 40 to +85 c; crystal: f = 4.194304 mhz; r s =50 w ; c l = 12 pf; maximum frequency tolerance = 30 10 - 6 ; unless otherwise speci?ed. note 1. a suitable resistor (r) must be selected (example): a) v dd = 5 v; r max. (12 v - 5 v)/700 m a=10k w . b) v dd = 5 v; r typ. (12 v - 5 v)/900 m a = 7.8 k w (more reserve). c) i dd must not exceed 3 ma. symbol parameter conditions min. typ. max. unit supply v dd supply voltage voltage regulator programmed to 4.5 v at t amb =25 c 3 - 6v d v dd supply voltage variation s1 or s2 closed -- 50 mv tc supply voltage variation due to temperature -- 0.35 - %/k v dd = 4.5 v -- 16 - mv/k i dd supply current note 1 700 950 -m a c ext capacitance external capacitor 47 --m f oscillator t osc start time -- 200 ms d f/f frequency deviation nominal n = 0 0 60 10 - 6 110 10 - 6 d f/f frequency stability d v dd = 100 mv -- 1 10 - 6 r fb feedback resistance 300 1000 3000 k w c i input capacitance - 16 - pf c o output capacitance - 27 - pf inputs r o pull-up resistance s1, s2, ts, sel and data 45 90 180 k w i il leakage current flash, enable, mode -- 2 m a t d debounce time s1 and s2 only 30 65 100 ms v pp programming voltage i o2 output current v pp =v dd - 5v 70 - 700 m a during programming - 500 -m a backplane (high and low levels) r bp output resistance 100 m a -- 3k w segment r seg output resistance 100 m a -- 5k w lcd v offset(dc) dc offset voltage 200 k w /1 nf -- 50 mv
1997 apr 16 11 philips semiconductors product speci?cation 4-digit static lcd car clock PCF1174C chip dimensions and bonding pad locations fig.7 bonding pad locations, PCF1174Cu; 40 terminals. chip area: 6.4 mm 2 . bonding pad dimensions: 110 m m 110 m m. chip thickness: 381 25 mm. msa998 0 0 osc in osc out v ss mode v pp ts enable v dd 2.12 mm flash x sel s2 a4 f4 g4 b3 ad3 f3 g3 col b2 PCF1174Cu data s1 b4 c4 d4 e4 c3 e3 c2 d2 e2 c1 3.02 mm adeg1 am y pm bp b1 g2 f2 a2
1997 apr 16 12 philips semiconductors product speci?cation 4-digit static lcd car clock PCF1174C table 2 bonding pad locations (dimensions in m m) all x/y coordinates are referenced to the bottom left pad (osc in), see fig.7. pad x y pad x y bp 600 2676 v pp 800 0 pm 400 2676 ts 1000 0 am 200 2676 enable 1200 0 adeg1 0 2676 v dd 1400 0 c1 - 138 2448 flash 1538 168 e2 - 138 2228 sel 1538 388 d2 - 138 2008 s2 1538 608 c2 - 138 1808 a4 1538 808 e3 - 138 1608 f4 1538 1008 c3 - 138 1408 g4 1538 1208 e4 - 138 1208 b3 1538 1408 d4 - 138 1008 ad3 1538 1608 c4 - 138 808 f3 1538 1808 b4 - 138 608 g3 1538 2008 s1 - 138 388 col 1538 2208 data - 138 168 b2 1538 2448 osc in 0 0 a2 1400 2676 osc out 200 0 f2 1200 2676 v ss 400 0 g2 1000 2676 mode 600 0 b1 800 2676 chip corner (max. value) - 360 - 170
1997 apr 16 13 philips semiconductors product speci?cation 4-digit static lcd car clock PCF1174C application information fig.8 typical application diagram. (1) to be placed close to the ic. msa999 osc in osc out 17 18 oscillator am/pm counter hours counter minutes counter seconds counter adjustable divider eeprom control logic voltage regulator 21 v pp 25 flash 22 ts 23 enable s1 s2 15 data sel 26 16 27 20 19 v ss mode decoder decoder bp 1 2 - 14 28 - 40 segment drivers to lcd PCF1174C 12 v 6.8 k w i dd (1) 100 nf v dd c ext 47 m f
1997 apr 16 14 philips semiconductors product speci?cation 4-digit static lcd car clock PCF1174C package outline unit a 1 a 2 a 3 b p cd (1) e (2) eh e ll p qy w v q references outline version european projection issue date iec jedec eiaj mm inches 0.3 0.1 2.45 2.25 0.25 0.42 0.30 0.22 0.14 15.6 15.2 7.6 7.5 0.762 12.3 11.8 1.15 1.05 0.6 0.3 7 0 o o 0.1 0.1 dimensions (inch dimensions are derived from the original mm dimensions) note 1. plastic or metal protrusions of 0.4 mm maximum per side are not included. 2. plastic interlead protrusions of 0.25 mm maximum per side are not included. 1.7 1.5 sot158-2 x w m q a a 1 a 2 b p d h e l p q detail x e z e c l v m a (a ) 3 a y 40 21 20 1 pin 1 index 0.012 0.004 0.096 0.089 0.017 0.012 0.0087 0.0055 0.61 0.60 0.30 0.29 0.03 2.25 0.089 0.48 0.46 0.045 0.041 0.024 0.012 0.004 0.2 0.008 0.004 0.067 0.059 0.010 z (1) 0 5 10 mm scale 92-11-17 95-01-24 vso40: plastic very small outline package; 40 leads; face down sot158-2 a max. 2.70 0.11
1997 apr 16 15 philips semiconductors product speci?cation 4-digit static lcd car clock PCF1174C soldering introduction there is no soldering method that is ideal for all ic packages. wave soldering is often preferred when through-hole and surface mounted components are mixed on one printed-circuit board. however, wave soldering is not always suitable for surface mounted ics, or for printed-circuits with high population densities. in these situations reflow soldering is often used. this text gives a very brief insight to a complex technology. a more in-depth account of soldering ics can be found in our ic package databook (order code 9398 652 90011). re?ow soldering reflow soldering techniques are suitable for all vso packages. reflow soldering requires solder paste (a suspension of fine solder particles, flux and binding agent) to be applied to the printed-circuit board by screen printing, stencilling or pressure-syringe dispensing before package placement. several techniques exist for reflowing; for example, thermal conduction by heated belt. dwell times vary between 50 and 300 seconds depending on heating method. typical reflow temperatures range from 215 to 250 c. preheating is necessary to dry the paste and evaporate the binding agent. preheating duration: 45 minutes at 45 c. wave soldering wave soldering techniques can be used for all vso packages if the following conditions are observed: a double-wave (a turbulent wave with high upward pressure followed by a smooth laminar wave) soldering technique should be used. the longitudinal axis of the package footprint must be parallel to the solder flow. the package footprint must incorporate solder thieves at the downstream end. during placement and before soldering, the package must be fixed with a droplet of adhesive. the adhesive can be applied by screen printing, pin transfer or syringe dispensing. the package can be soldered after the adhesive is cured. maximum permissible solder temperature is 260 c, and maximum duration of package immersion in solder is 10 seconds, if cooled to less than 150 c within 6 seconds. typical dwell time is 4 seconds at 250 c. a mildly-activated flux will eliminate the need for removal of corrosive residues in most applications. repairing soldered joints fix the component by first soldering two diagonally- opposite end leads. use only a low voltage soldering iron (less than 24 v) applied to the flat part of the lead. contact time must be limited to 10 seconds at up to 300 c. when using a dedicated tool, all other leads can be soldered in one operation within 2 to 5 seconds between 270 and 320 c.
1997 apr 16 16 philips semiconductors product speci?cation 4-digit static lcd car clock PCF1174C definitions life support applications these products are not designed for use in life support appliances, devices, or systems where malfunction of these products can reasonably be expected to result in personal injury. philips customers using or selling these products for use in such applications do so at their own risk and agree to fully indemnify philips for any damages resulting from such improper use or sale. data sheet status objective speci?cation this data sheet contains target or goal speci?cations for product development. preliminary speci?cation this data sheet contains preliminary data; supplementary data may be published later. product speci?cation this data sheet contains ?nal product speci?cations. limiting values limiting values given are in accordance with the absolute maximum rating system (iec 134). stress above one or more of the limiting values may cause permanent damage to the device. these are stress ratings only and operation of the device at these or at any other conditions above those given in the characteristics sections of the speci?cation is not implied. exposure to limiting values for extended periods may affect device reliability. application information where application information is given, it is advisory and does not form part of the speci?cation.
1997 apr 16 17 philips semiconductors product speci?cation 4-digit static lcd car clock PCF1174C notes
1997 apr 16 18 philips semiconductors product speci?cation 4-digit static lcd car clock PCF1174C notes
1997 apr 16 19 philips semiconductors product speci?cation 4-digit static lcd car clock PCF1174C notes
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