HT7500 Просмотр технического описания (PDF) - Holtek Semiconductor

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HT7500

Clinical Thermometer

Holtek Semiconductor 

HT7500

k. When measurement is over, but if the

temperature rises within 8 min 40 sec, the °C (or °F)

mark will flash again (repeat from step 2-d), and

starts to count 8 min 40 sec again.

l. When beep sound is on for 4 sec, the temperature is

not measured.

· When power off: the standby current £ 1mA.

· The frequency of the buzzer is 5.3kHz

· Bonding option °C or °F

· Measurement to 0.1 degree in either °C or °F

· Sensor use 503ET

· Reference resistor is the value (sensor in 37.0°C)

· When battery voltage is low, the battery mark Ñ

flashes at the speed of 1Hz and the measurement

may not be accurate. The low voltage detect: 1.35V ±

0.05V.

· During the process of mass production, in order to ad-

just the reference resistance (RF), let test 2 be float-

ing, the measured temperature will be the actual

temperature of the measured environment. It can be

up or down, not always the higher one.

Flow Chart

P ow erO n

D is p la y A ll S e g m e n t

D is p la y L a s t M e a s u r e d

T e m p e ra tu re

D is p la y L C

2 sec

2 sec

0 .7 5 s e c

D is p la y

LC

M e a s u re

D is p la y th e

H ig h e s t V a lu e

D is p la y

HC

D is p la y

N o t C h a n g e d fo r

No

O ver 16 sec

A la r m

C N o t . la s h fo r 4 s e c

( C a n 't M e a s u r e )

T e m p e ra tu re

Y es

R is e s w ith in

8 m in 4 0 s e c

No

P o w e r O ff

Rev. 1.10

5

November 27, 2001

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