cdt-3050v --- 1 CDT3050V p. 1 3-digit down timer ic description features the cdt3050h is a low voltage 3 digits lcd driver for advanced count down timer . minimal components are used. with start/stop and recall setting functions. lcd: 1/2 duty, 1/2 bias, 2 commons cmos technology supply voltage range 1.2 ~ 1.8vdc low standby current < 5 a with a trigger output capability time setting max: 999 minutes min: 1 minute 32768 hz crystal used lcd displays seconds until the last minute 16 seconds, 4hz (64 sounds) bibi alarm when time runs out ? ? - operating symbol ? s ? - seconds symbol applications device type type no. package CDT3050V chip form count down timer electronic timer setting control timer dc electronical characteristics characteristics symbol min type max unit operation voltage vdd 1.2 1.5 1.8 v operation current i dd - - 2.0 a bz driver current i bz 2.0 - - ma crystal - 32768 - hz lcd display freq - 32 - hz k0~k9 input current i key - - 5 a trigger output current i trig 1 - - ma above testing conditions are based on vdd=1.5v ?w??? chip design technology inc. 89 10 24
cdt-3050v --- 2 CDT3050V p. 2 3-digit down timer ic pad assignment pin descriptions chip pad symbol functions description 1 vdd positive power supply 2 vss negative power supply 3 osco oscillator output , with 32,768hz crystal 4 osci oscillator input 5 stap start/stop key, start, stop push switch 6 ts1 internal testing pin 7 8 9 10 11 12 13 14 15 16 k9 k8 k7 k6 k5 k4 k3 k2 k1 k0 time setting key (9) time setting key (8) time setting key (7) time setting key (6) time setting key (5) time setting key (4) time setting key (3) time setting key (2) time setting key (1) time setting key (0) 36 vee 35 com2 34 fe1 33 ag1 32 bc1 31 d1 30 fe2 29 ag2 28 bc2 27 d2 26 fe3 25 ag3 24 bc3 23 d3 21 22 / s com1 20 bz1 19 bz2 4 osci 5 stap 6 ts1 7 k9 8 k8 9 k7 10 k6 11 k5 12 k4 13 k3 14 k2 15 k1 16 k0 17 trig 18 ts2 1 2 vdd vss 3 osco 37 38 cap1 0512 CDT3050V chip size: 3180 x 2040 m ic vdd
cdt-3050v --- 3 CDT3050V p. 3 3-digit down timer ic chip pad symbol functions description 17 trig trigger output 18 ts2 internal testing pin 19 20 bz2 bz1 buzzer output buzzer output continues bibi alarm, 16sec 4hz ? 64 sounds 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 com1 /s d3 bc3 ag3 fe3 d2 bc2 ag2 fe2 d1 bc1 ag1 fe1 com2 lcd common1 ( ) timer is working ( s ) seconds symbol lcd segment lcd segment lcd segment lcd segment lcd segment lcd segment lcd segment lcd segment lcd segment lcd segment lcd segment lcd segment lcd common2 36 vee voltage doubled input 37 cap1 voltage doubled capacitor 38 0512 voltage doubled capacitor start 0 start stop
cdt-3050v --- 4 CDT3050V p. 4 3-digit down timer ic application circuits 10 keys setting timer lcd drawing com2 segments com1 start/stop k0 k1 k2 k3 k4 k5 k6 k7 k8 k9 osci osco cap1 cap2 vee bz1 bz2 vdd vss trig s com2 com1 buzzer 1.5v 104 104 32768hz 10pf 3 digit CDT3050V a g d c e f b a g d c e f b a g d c e f b s com2 f1 a1 b1 / f2 a2 b2 / f3 a3 b3 / / / e1 g1 c1 d1 e2 g2 c2 d2 e3 g3 c3 d3 s com1 com2 com1 e1 g1 c1 d1 e2 g2 c2 d2 e3 g3 c3 d3 s f1 a1 b1 f1 a2 b2 f3 a3 b3 digit1 digit2 digit3
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