C4331E 4-DIGIT COUNTDOWN/UP TIMER CHINAIC SEMICONDUCTOR CORP., LTD. Edition Author Date Description V /4/6 C4331B
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1 CHINAIC SEMICONDUCTOR CORP., LTD. 4-DIGIT COUNTDOWN/UP TIMER Edition Author Date Description V /4/6 C4331B V /10/31 C4331C,The decode circuit of LCD use gate circuit in version 1.0,but replace with ROM decode circuit in version 2.0 V /10/ /10/2015 V3.0
2 1.General Descriptions is an UP/DOWN timer IC. It can directly drive a standard 4 digit 1/4 duty cycle LCD. Maximum countdown time is 59:59 or 99:59. Count up cycle time is 60 or 100 minutes by bonding option. Also bonding option is for alarm time 32 or 64 seconds, 2kHz, up/down or just down, and sleep function. Feasible input options and universal functions give this chip many uses such as parking alarm timer, pillbox timer, kitchen timer, etc. 2.Features Special alarm trigger output for switch control or for driving another melody IC Internal voltage doubler 32,768Hz quartz crystal time base Single 1.5V battery operation Direct drive buzzer 4 digit LCD display Maximum count 59:59 min or 99:59 min (bonding option) Just count-down timer repeat function by bonding option Minutes and Seconds set independently Timer reset when depressing MSET and SSET simultaneously Alarm sound 2kHz, 32 or 64 seconds (bonding option) 10 minutes sleep function (bonding option) /10/2012 V3.0
3 3.Function Block Diagram 4.Pad Diagram (Unit:um) START OPT1 CSLP VDD SSET MSET VA VB TEST OPT3 CS7 VC BZ1 GND OPT2 TRIG OSCI OSCO COM3 COM4 COM1 SEG8 COM2 SEG1 SEG2 SEG3 SEG4 SEG5 SEG6 SEG7 Notice: The substrate must be connected to VDD /10/2012 V3.0
4 No. Name X Y No. Name X Y 1 VA SEG VB COM TEST COM OPT OSCO CS OSCI VC TRIG COM OPT COM GND SEG BZ SEG VDD SEG CSLP SEG OPT SEG START SEG SSET SEG MSET Pin Descriptions NO. Name I/O Function 1 VA O Voltage Doubler Capacitor 2 VB O Voltage Doubler Capacitor 3 TEST I Test Input Pins 4 OPT3 I Bonding option for maximum count 5 CS7 I Bonding option for display 7 or 7 6 VC O voltage doubler supply for LCD driving 7 COM1 O LCD COM Pin 8 COM2 O LCD COM Pin 9-16 SEG1 SEG8 O LCD Segments Driving Pins 17 COM4 O LCD COM Pin 18 COM3 O LCD COM Pin /10/2012 V3.0
5 19 OSCO O Oscillator Output 20 OSCI I Oscillator Input 21 TRIG O Trigger Output 22 OPT2 I Bonding option for up/down or input down 23 GND P Ground 24 BZ1 O AlarmOutput 25 VDD P Power pins for positive power supply 26 CSLP I Bonding option for 10 minutes sleep 27 OPT1 I Bonding option for alarm time 28 START/STOP I Start or Stop Input 29 SSET I Second Setting Input 30 MSET I Minute Setting Input 5.1 OPT1 (Bonding option for alarm time) The alarm time will be 32 sec when this pin is disconnected and 64 sec when this pin is connected to GND. 5.2 OPT2 (Bonding option for up/down or input down) The up/down mode will be up when this pin is disconnected and down just mode when this pin is connected to GND. 5.3 OPT3 (Bonding option for maximum count) When it is disconnected the maximum MINUTE count is 99:59 and when it is connected to GND, the maximum MINUTE count is 59: CSLP (Bonding option for 10 minutes sleep function) The 10 minutes sleep function is disable when this pin is disconnected and enable when this pin is connected to GND. 5.5 CS7 (Bonding option for display 7 or 7 ) The LCD display 7 when this pin is disconnected and display 7 when this pin is connected to GND. 6.Functional Description 6.1 Countdown Timer Mode After power-on, LCD will display 00: Time is set by the SSET and MSET pins. Time setting is only effective in this mode and the timer must be in the stop or reset state. Each depression of these pins will make the /10/2012 V3.0
6 timer count advance one digit and if it is depressed more than one second, the timer will count one digit for every 1/8 second. The second and minute setting are independent. Colon will be on but not flash during the setting The timer will reset to 00:00, if SSET and MSET are depressed simultaneously After the time has been set, triggering the START/STOP pin will start the timer and colon will begin to flash (0.5 sec on, 0.5 sec off) When the timer is counting, it will be stopped by triggering off any key pin. When the timer is stopped by pressing MSET or SSET key, the preset time will be the time of last pressing one of this keys. In this stop state, the colon will be on, but not flash. The timer can also be set during this state. An additional trigger to START/STOP will terminate this state and start to count from the time which it displays When countdown time is reached, the LCD displays 00:00 and the colon will be on but not flash. At this moment, BZ1 will send out a 2048 x 8 x 1Hz signal for 32 second (or 64 sec by bonding option). During this alarm period, depress any pin will stop the output When the countdown timer reaches zero and the alarm signal ends (32 or 64 sec), the LCD will be returned to preset time. If alarm signal is stopped by depressing START/STOP, the LCD will be returned to preset time. If alarm is stopped by the SSET or MSET pin, the LCD displays 00:00 and then depressing START/STOP pin will be returned the LCD to preset time Countup Timer Mode The count-up timer will be triggering START/STOP start only when the chip has been reset and powered on without a set time. The countup timer will start by triggering Start/Stop after reset The countup timer has a cyclical count of 59 minutes (or 99 minutes by bonding option) after being started While the countup timer is counting, depressing the any key will stop it. Another trigger of START/STOP will start the timer continuously counting When the chip is in count up timer mode, the chip can change to count down timer mode after the countup timer is stopped by any key and then preset by MSET and SSET /10/2012 V3.0
7 7.Application Circuit 7.1 Three Keys Application: MSET SSET START/STOP 7.2 Four Keys Application: MSET SSET START/STOP RESET NOTE: The chip substrate must be connected to VDD /10/2012 V3.0
8 8.LCD FORMAT COM3 COM4 SEG8 SEG7 SEG6 SEG5 SEG4 SEG3 SEG2 SEG1 COM2 COM1 F A B COLON G E C D LCD Voltage: 3.0V, 1/2Bias, and 1/4Duty SEG8 SEG7 SEG6 SEG5 SEG4 SEG3 SEG2 SEG1 COM1 A1 B1 A2 B2 A3 B3 A4 B4 COM2 F1 G1 F2 G2 F3 G3 F4 G4 COM3 E1 C1 E2 C2 E3 C3 E4 C4 COM4 - D1 - D2 COLON D3 - D4 9.Electrical Characteristics (Ta = 25 C, GND =0V, VDD =-1.5V, FOSC = Hz,unless otherwise specified) Parameter Symbol Test Conditions Min. Typ. Max. Unit Operating Voltage VDD V Display Voltage VC V Supply Current ICC Without Load µa Sleep Current ISB 1 ua Output Drive Current (BZ, TRIG Output) I OH IOL VOH = 1.35V (TRIG Output) VOL = 0.15V (TRIG Output) VOL = 0.5V (BZ Output) µa 5 10 ma Frequency Stability Δf/f VCC = 1.25V to 1.70V 10 ppm Oscillator Built-in CD pf Capacitor Alarm Output Frequency FBZ x Hz x1 Oscillator Start up Time TOS VCC = 1.30V -- 2 sec /10/2012 V3.0
9 10.Absolute Maximum Ratings Parameter Symbol Limits Unit Supply Voltage VDD -0.3 ~ 5 V Input Voltage VI GND-0.3 ~ VDD+0.3 V Output Voltage VO GND-0.3 ~ VDD+0.3 V Operating Temperature TOPR 0 ~ 70 Storage Temperature TSTG -20 ~ Editions Editions Expression Date V1.0 C4331B 2004/4/6 C4331C, The decode circuit of LCD use gate circuit in V2.0 version 1.0,but replace with ROM decode circuit in version 2006/10/ V /10/15 12.Notices 1.The information contained herein could be changed without notice owing to product and /or technical improvements. Please make sure before using the product that the information you are referring to is up-to-date. 2.No responsibility is assumed by us for any consequence resulting from any wrong or improper operation, etc.of the product /10/2012 V3.0
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========================== CONTENTS =========================== 1. INTRODUCTION... 3 2. FEATURES... 3 3. BLOCK DIAGRAM... 4 4. PIN ASSIGNMENT... 5 5. FUNCTION DESCRIPTIONS... 6 5.1. OSCILLATOR... 6 5.2.
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