描述 Description

The PCF8564A is a CMOS real-time clock and calendar optimized for low power consumption. A programmable clock output, interrupt output and voltage low detector are also provided. All addresses and data are transferred serially via a two-line bidirectional I2C-bus. Maximum bus speed is 400 kbit/s. The built-in word address register is incremented automatically after each written or read data byte.

特性 Features

Provides year, month, day, weekday, hours, minutes, and seconds based on a 32.768 kHz quartz crystal
Wide clock operating voltage: 1.0 V to 5.5 V
Low back-up current typical 250 nA at 3.0 V and 25 ℃
400 kHz two-wire I2C interface (1.8 V to 5.5 V)
Low-voltage detector
Alarm and timer functions
Two integrated oscillator capacitors
Programmable clock output for peripheral devices (32.768 kHz, 1.024 kHz, 32?Hz, and 1?Hz)
Internal Power-On Reset (POR)
I2C slave address: read A3h, write A2h

應(yīng)用 Application

Timing devicesTime of the day tracking
Process timing
Alarm

Portable instruments
Electronic metering
Battery powered products