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

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производитель

HT7500
(Rev.:2000)

Clinical Thermometer

Holtek Semiconductor 

Application Circuits

HT7500

1 .5 V

B a tte ry

400kW

2200~2700pF

REF

SENSO R

R OSC= 820kW

B uzzer

LO W C

VSS

SC

RF

RS

VDD

PSW

TEST2

C LFH

O SCI

O SCO

BZ1

BZ2

C 512

CAP

VEE

SD1

S C 1~3

S B 1~3

S A 1~3

COM 3

COM 2

COM 1

0 6%#

0 .0 2 2 m F

0 .0 2 2 m F

To LC D

Note: Substrate connect to VDD

VEE, CAP, and C512 are externally connected to capacitors for stabilizing VEE (=-1.5V).

BZ1 and BZ2 are connected to an external buzzer to generate sounds.

LOWC is connected to an external resistor for adjusting the detector level of a low voltage de-

tector. Open the pin when not in use.

OSCI, OSCO are connected to an external resistor, and form an RC oscillator with a built-in

capacitor for SYSTEM clock (=32kHz)

RS, RF, SC constitute an alternating RC oscillator, which allows one oscillator, namely RS or

RF, active at a time.

REF (reference resistor) is a resistor value equal to 503ET, sensor is value in 37.0 °C or 98.6 °F.

SENSOR is a 503ET thermistor.

7

August 8, 2000

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