HT7500(2000) Просмотр технического описания (PDF) - Holtek Semiconductor

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Компоненты Описание

производитель

HT7500
(Rev.:2000)

Clinical Thermometer

Holtek Semiconductor 

HT7500

Pad Description

Pad No. Pad Name

1

LOWC

2

VSS

3

SC

4

RF

5

RS

6

VDD

7

PSW

8

TEST2

9

10

11

12

13

14~16

17~19

20~22

23~25

26

27

28

29

30

31

32

33

CLFH

OSCI

OSCO

BZ1

BZ2

COM1~COM3

SA1~SA3

SB1~SB3

SC1~SC3

SD1

VEE

CAP

C512

TV

TEST1

TIM

TS816

I/O

Function

B For the supply voltage detector, open the pin when not in use.

I Power supply GND

B Common point, NMOS open drain

O Connect reference resistor, PMOS open drain

O Connect sensor resistor, PMOS open drain

¾ Positive power supply

I Pull-low input pin, push switch to turn power on or off

Pull-low test pin, for production test, floating LCD displays

I the real time value, when connected to VDD, LCD displays

the highest value.

I Floating for °C, connect to VDD for °F

I For system oscillator in

O For system oscillator out

O Buzzer output 1

O Buzzer output 2

O LCD backplane drive, 3-level voltage out

O LCD segment drive

O LCD segment drive

O LCD segment drive

O LCD segment drive

O Generate negative voltage (-1.5V)

O For negative voltage, NMOS output

O For negative voltage, inverter output

B Test pin for IC

I Test pin for IC

I Test pin for IC

I Test pin for IC

3

August 8, 2000

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