ETC CH2111S

 1. General Descriptions
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4. Pin Descriptions
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7. Absolute Maximum Ratings
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Note: These are stress ratings only. Stresses exceeding the range specified under “Absolute Maximum
Ratings” may cause substantial damage to the device. Functional operation of this device at other
conditions beyond those listed in the specification is not implied and prolonged exposure to extreme
conditions may affect device reliability.
8. Electrical Characteristics
(All voltage referenced to GND, Ambient temperature=25
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Note: 1/3 duty, 1/2 bias, (LCD uses 3V)
9. Pad Diagram
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10. Application Circuit
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Note: 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 to generate 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 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 is value in 37.0 or 98.6.
SENSOR is a 503ET thermistor.
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