The PCF1175C 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.
The Philips PCF1175C is a single-chip CMOS integrated circuit designed to drive a 4-digit duplex liquid crystal display (LCD). It provides hours, minutes, and seconds functions and includes an internal voltage regulator that is electrically programmable for various LCD voltages. The device operates at a 4.19 MHz oscillator frequency and supports both 12-hour and 24-hour modes.
| Oscillator Frequency | 4.19 MHz |
|---|---|
| Operating Ambient Temperature | -40 to +85 °C |
| Package Type | 28-lead plastic SMD (S028) |
| Package Name | SOT136-1 |
| Maximum LCD Voltage Steps | 31 |
To enable programming, SEL is set to open-circuit and a level of Vpp - 5 V is applied to Vpp.
The device operates within an ambient temperature range of -40 to +85 °C.
When the temperature is +85 °C, the voltage drops from 4.5 V to 4 V.