HT7500(2000) 查看數據表（PDF） - Holtek Semiconductor

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HT7500
(Rev.:2000)

Clinical Thermometer

Holtek Semiconductor 

HT7500

Function Description

· Power sw: push switch to power on or power

off.

· When power on: push the switch, then it will

generate a ²beep² sound for 0.125 sec.

a. First displays all the segments on for 2 sec.

b. After a. as described above, then shows the

last time measured temperature for 2 sec.

c. After b., shows L °C or °F for 0.75 sec.

d. After c., displays the measured temperature,

then °C or °F mark will flash at a speed of 1Hz.

e. If the temperature is < 32°C (or 90°F), the

display shows L °C (or °F).

f. If the temperature ³ 42°C (or 108°F the

display shows H °C (or °F ).

g. The display always shows the higher

temperature during the temperature

measurement.

h. If the measured temperature does not

change for more than 16 sec., the measure-

ment is over and the °C (or °F) mark flash

stops.

i. When measurement is over, if the

temperature > 37.5°C (or 99.5°F) the

buzzer alarms ²beep-beep-beep-beep-

beep-beep-² for 4 sec, as follows:

BI

BI

BI

0 .1 2 5 S 0 .1 2 5 S 0 .1 2 5 S 0 .1 2 5 S 0 .1 2 5 S 0 .1 2 5 S 0 .3 7 5 S

if the temperature £ 37.5°C (or 99.5°F), the

buzzer alarms ²beep-beep-beep-beep-² for

4 sec, as follows:

BI

0 .5 S 0 .5 S

j. It will automatically turn the power off when

measurement is over for 8 min 40 sec.

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 mea-

surement may not be accurate. The low volt-

age detect: 1.35V ± 0.05V.

· During the process of mass production, in or-

der to adjust the reference resistance (RF), let

test 2 be floating, the measured temperature

will be the actual temperature of the mea-

sured environment. It can be up or down, not

always the higher one.

5

August 8, 2000

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