Application Circuits
HT7501
Notes: Substrate connect to VDD.
VEE, CAP and C512 are externally connected to capacitors for stabilizing VEE (=–1.5V).
BZ1 and BZ2 are connected to an external Buzzer for generating sounds.
LOWC is connected to an external resistor for adjusting the detector level of a low voltage
detector. Open the pin when not in use.
OSCI, OSCO are connected to an external resistor, and form an RC oscillator with a built-in
capacitor for SYSTEM clock (=32kHz)
RS, RF, SC constitute an alternating RC oscillator, which allows one oscillator, namely RS or
RF, active at a time.
REF (reference resistor) is a resistor value equal to 503ET sensor in 37.00°C.
SENSOR is a 503ET thermistor.
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8th Feb ’99