HT7500_01 Datasheet, PDF (1/7 Pages) Holtek Semiconductor Inc – Clinical Thermometer

HT7500
Clinical Thermometer
Features
· Single-chip CMOS construction
· Single 1.5V battery operation
· Measurement range: +32.0~+42.0°C
(+90.0~+108.0°F)
Measurement accuracy: ±0.1°C (±0.2°F)
Resolution: 0.1°C (0.1°F)
· Bonding option for Centigrade/Fahrenheit measure-
ment
General Description
The HT7500 is a CMOS digital clinical thermometer IC
for measuring body temperature in Centigrade (°C) or
Fahrenheit (°F) mode by its bonding option. It also pro-
vides alarm and auto power off functions. The other
· Alarm warning for fever
· Highest temperature hold
· Auto power off after 8 min 40 sec
· One-key input switch for ON/OFF
· Displays last time measured temperature
electronic components are LCD display, thermister,
1.5V battery, ON/OFF switch, buzzer, resistors and ca-
pacitors.
Block Diagram
O SCI
O SCO
TEST2
PSW
C L.H
R.
RS
SC
VDD
VSS
S y s te m
O SC
C o n tro l
C ir c u it
S ensor
O SC
C o u n te r a n d
C o m p a ra to r
T IM E R
P u ls e
G e n e ra to r
P u ls e
T a b le
V o lta g e
D o u b le r
C o u n te r ,
C o m p a ra to r a n d
L a tc h
L C D D r iv e r
LO W C
BZ1
BZ2
C 512
CAP
VEE
C O M 1~3
S A 1~S D 1
Rev. 1.10
1
November 27, 2001