Holtek Semiconductor HT7500
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 provides alarm and auto power off functions. The other electronic components are LCD display, thermister, 1.5V battery, ON/OFF switch, buzzer, resistors and capacitors.FEATURES
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● 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 measurement
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● 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
GENERAL DESCRIPTION
Block Diagram O S C I O S C O T E S T 2 P S W C L F H R F R S S C V D D V S S S y s te m O S C C o u n te r a n d C o m p a ra to r T IM E R L O W C B Z 1 B Z 2 C 5 1 2 C A P V E E C o n tro l C ir c u it 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 S e n s o r O S C P u ls e G e n e ra to r P u ls e T a b le L C D D r iv e r C O M 1 ~ 3 S A 1 ~ S D 1 T V T IM T E S T 1 T S 8 1 6 1 August 8, 2000 HT7500 Pad Assignment T E S T 1 T S 8 1 6 3 3 C 5 1 2 C A P S D 1 V E E S C 3 T IM 3 2 T V 3 0 3 1 2 9 2 8 2 7 2 6 2 5 2 4 2 3 2 2 2 1 S C 2 S...