HT7500 datasheet(4/7 Pages) HOLTEK

4 / 7 page

Electrical Characteristics

Ta=25

°C

Symbol

Parameter

Test Conditions

Min.

Typ.

Max.

Unit

VDD

Conditions

VDD

Operating Voltage

¾¾

1.3

1.5

1.65

IDD

Operating Current

1.5V

No load

100

ISTB

Standby Current

1.5V

¾¾

1.0

fOSC

Oscillating Frequency

1.5V

ROSC=820k

25.6

38.4

kHz

°C

Temperature Measurement Accuracy

at Range 35

°C~39°C

¾¾

-0.1

0.1

°C

°F

Temperature Measurement Accuracy

at Range 95

°F~102°F

¾¾

-0.2

0.2

°F

LCD Electrode Pattern

SA1

SA2

SA3

SB1

SB2

SB3

SC1

SC2

SC3

SD1

COM1

COM2

COM3

¾¾

Note: 1/3 duty, 1/2 bias (LCD uses 3V)

HT7500

Rev. 1.10

November 27, 2001

Function Description

· Power sw: push switch to power on or power off.

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

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

°Cor °F for 0.75 sec.

d. After c., displays the measured temperature,

then

°Cor °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 measurement 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:

if the temperature

£ 37.5°C (or 99.5°F), the

buzzer alarms

²beep-beep-beep-beep-² for

4 sec, as follows:

· j. It will automatically turn the power off when

measurement is over for 8 min 40 secretary.

B I

0 . 1 2 5 S 0 . 1 2 5 S 0 . 1 2 5 S 0 . 1 2 5 S

B I

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

B I

0 . 5 S

H 1

. 1

E 1

D 1

C 1

B 1

A 1

G 1

B 2

B 3

A 2

A 3

C 2

C 3

G 2

G 3

E 2

E 3

. 2

. 3

D 2

D 3

H 1

A 4

B 4

C 4

H 3

H 2

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