The countdown to 99 hours of 99 points

V2002

FUNCTIONS

* 4 digit countdown/up timer;

* It can directiy drive LCD; 

* Maximum countdown time is 99:59 hour;

* Bonding option is for alarm time 32 or 64 seconds;

* Bonding option is for up/down or just down function.

FEATURES

* Internal voltage doubler;

* 32,768Hz quartz crystal time base; 

* Minutes and Seconds set independently; 

* Direct drive buzzer; 

* Low power dissipation; 

* Protection against static discharge.

ELECTRICAL CHARACTERISTICS

Bonding option:

 OPT1                                 OPT2

dangling  Rings at the 30 s           dangling   Positive and negative timing function.

  VSS       Rings at 60 s.                    VSS             The timer function.

FUNCTION DESCRIPTION

The timing mode:

* add electric LCD display is prefer;

  * SSET, MSET key set time, time setting in the initial model and only

effective counter to stop or reset condition. Press the two key

independently, set up, the colon shows but not flashing;

  * press the SSET with MSET button at the same time,

the counter is reset to 00:00;

  Timing starts * time setting and trigger the START button, the colon START flashing.

  * in the process of the timer, press any key to stop time, press the MSET

key or SSET key at this time, the current time is preset time, the colon

shows but not flashing at this time. Counter in time setting state, trigger

START key timing starts time setting state.

  * the end of the timing, LCD display for 00:00 and colon but not flashing,

the rings at beginning

(rings at 30 seconds or 60 seconds long);

  * the end of the timing, and rings at the end, the LCD display the preset time.

(if is to press the START key rings at stop, LCD display preset time;

If it is according to the SSET or MSET key rings at stop, LCD display to 00:00,

then press the START button LCD display preset time.)

Is the timing mode:

  * is timing mode only when reset or power up haven't set a time effectively,

to trigger the START button and START the time.

* is timing start the time clock will cycle to 99 hours after;

  * is in the process of the timing, press any key to stop time,

at this time to trigger the START time key to continue;

  * is timing mode, press any key to stop,

then press MSET and SSET set the timing time, timer transform to the timing mode.

LCD field distribution

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

LCD 字形显示

APPLICATION INFORMATION

Pad	Name	X,Y	Pad	Name	X,Y
1	COM1	-709.60,-551.68	15	OPT2	709.84,287.68
2	GND	-709.60,-417.60	16	OSCO	709.84,155.68
3	TEST1	-709.60,-293.60	17	OSCI	709.84,-334.88
4	CAP2	-709.60,-177.60	18	COM3	709.84,-551.68
5	CAP1	-709.60,156.96	19	COM4	580.80,-551.68
6	TEST2	-709.60,280.96	20	S8	451.76,-551.68
7	SSET	-709.60,396.96	21	S7	322.72,-551.68
8	MSET	-709.60,551.68	22	S6	193.68,-551.68
9	START	-570.72,551.68	23	S5	64.64,-551.68
10	OPT1	-438.72,551.68	24	S4	-64.40,-551.68
11	VDD	-310.72,551.68	25	S3	-193.44,-551.68
12	TEST3	-186.72,551.68	26	S2	-322.48,-551.68
13	BZ	706,550	27	S1	-451.52,-551.68
14	VSS	709.84,419.20	28	COM2	-580.56,-551.68

APPLICATION DIAGRAM

 chip substrate VDD.

IC Size：1700um X 1400um