GENERAL DESCRIPTION

The PCF1178C is a single chip, 4.19 MHz CMOS car clock circuit providing hours, minutes and seconds functions. It is designed to drive a 4-digit duplex liquid crystal display (LCD).

Two external single-pole, single-throw switches will accomplish all time setting functions. Time calibration and voltage regulator are electrically programmable via an on-chip EEPROM. The circuit is battery-operated via an internal voltage regulator and an external resistor.

FEATURES

? Internal voltage regulator is electrically programmable for various LCD voltages

? Time calibration is electrically programmable (no trimming capacitor required)

? LCD voltage adjusts with temperature for good contrast

? 4.19 MHz oscillator

? 12-hour or 24-hour mode

? Operating ambient temperature: ?40 to +85 °C

? 28-lead plastic SMD (SO28)

? 1 Hz set mode.