Application Circuits

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

SENSOR is a 503ET thermistor.

HT7501

7

8th Feb ’99