其朋半導體股份有限公司 Chip Design Technology 89 年 10 月 24 日 CDT3050 P. 1 3-DIGIT DOWN TIMER IC ■ DESCRIPTION ■ FEATURES The CDT3050 is a low voltage 3 digits LCD driver for advanced Count Down Timer. CMOS Technology Supply Voltage Range：1.2 ~ 1.8VDC Low Standby Current < 5µA 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 Minimal components are used. With START/STOP and RECALL setting functions. LCD: 1/2 Duty, 1/2 Bias, 2 Commons ■ APPLICATIONS ■ DEVICE TYPE Count Down Timer Electronic Timer Setting Control Timer ■ Type No. Package CDT3050 Chip form DC ELECTRONICAL CHARACTERISTICS Characteristics Symbol Min Type Max Unit Operation Voltage VDD 1.2 1.5 1.8 V Operation Current Idd Ibz - - 2.0 µA 2.0 - - mA Crystal - 32768 - Hz LCD Display Freq - 32 - Hz - - 5 µA 1 - - mA BZ Driver Current K0~K9 Input Current Trigger Output Current Ikey Itrig ※ Above testing conditions are based on VDD=1.5V CDT-3050 --- 1 CDT3050 P. 2 3-DIGIT DOWN TIMER IC ■ PAD ASSIGNMENT 36 35 34 33 32 31 30 29 28 27 VEE COM2 FE1 AG1 BC1 D1 FE2 AG2 BC2 D2 25 24 23 /S 22 COM1 21 37 CAP1 38 0512 1 VDD 2 VSS BZ1 20 3 OSCO BZ2 19 CDT3050 Chip Size: 3180 X 2040μM ＊IC 底座接 VDD OSCI STAP TS1 4 ■ 26 FE3 AG3 BC3 D3 5 K9 K8 K7 K6 K5 K4 K3 K2 K1 K0 7 8 9 10 11 12 13 14 15 16 6 TRIG TS2 17 18 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) CDT-3050 --- 2 CDT3050 P. 3 3-DIGIT DOWN TIMER IC Chip PAD 17 Symbol TRIG Functions Description Trigger Output ： 0 START START STOP 18 19 20 TS2 BZ2 BZ1 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 COM1 ★/S D3 BC3 AG3 FE3 D2 BC2 AG2 FE2 D1 BC1 AG1 FE1 COM2 VEE CAP1 Internal Testing pin Buzzer Output Buzzer Output Continues BiBi Alarm, 16sec 4Hz – 64 Sounds 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 Voltage Doubled Input Voltage Doubled Capacitor 38 0512 Voltage Doubled Capacitor CDT-3050 --- 3 CDT3050 P. 4 3-DIGIT DOWN TIMER IC ■ APPLICATION CIRCUITS 10 KEYS SETTING TIMER ★ S COM2 COM1 3 Digit COM2 Segments COM1 Start/Stop K0 K1 K2 K3 K4 K5 K6 K7 K8 K9 BZ1 Buzzer BZ2 VDD CDT3050V 1.5V VSS TRIG OSCI OSCO CAP1 CAP2 VEE 104 10PF ■ 104 32768Hz LCD DRAWING DIGIT1 F1 E1 A1 G1 B1 C1 DIGIT2 D1 F1 E2 A2 G2 DIGIT3 B2 C2 F3 E3 D2 A3 G3 B3 C3 D3 ★ S COM2 COM1 a f g e a b f c e g d COM2 F1 / E1 ★ a b f c e b g s c d d A1 B1 / F2 A2 B2 / F3 A3 B3 / ★ / G1 C1 D1 E2 G2 C2 D2 E3 G3 C3 D3 S COM1 CDT-3050 --- 4