HT7500 Ver la hoja de datos (PDF) - Holtek Semiconductor
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HT7500 Datasheet PDF : 7 Pages
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HT7500
Electrical Characteristics
Symbol
Parameter
Test Conditions
VDD
Conditions
VDD
Operating Voltage
¾
¾
IDD
Operating Current
1.5V No load
ISTB
Standby Current
1.5V
¾
fOSC Oscillating Frequency
1.5V ROSC=820kW
Temperature Measurement Accuracy
R°C
at Range 35°C~39°C
¾
¾
Temperature Measurement Accuracy
R°F
at Range 95°F~102°F
¾
¾
Ta=25°C
Min. Typ. Max. Unit
1.3
1.5
1.65
V
¾
60
100
mA
¾
¾
1.0
mA
25.6
32
38.4 kHz
-0.1
¾
0.1
°C
-0.2
¾
0.2
°F
LCD Electrode Pattern
A1
A2
A3
A4
H1
.1
B1 .2
B2
.3
B3
G1
G2
G3
B4
C4
H1
E1
C1 E2
C2
E3
C3
H3
D1
D2
H2
D3
SA1
SA2
SA3
SB1
SB2
SB3
SC1
SC2
SC3
SD1
COM1
F1
A1
B1
F2
A2
B2
F3
A3
B3
A4
COM2
E1
G1
C1
E2
G2
C2
E3
G3
C3
B4
COM3
H1
D1
¾
¾
D2
H2
¾
D3
H3
C4
Note: 1/3 duty, 1/2 bias (LCD uses 3V)
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 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:
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 secretary.
Rev. 1.10
4
November 27, 2001
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