描述 Description

AT8564A is a CMOS real-time clock/calendar chip optimized for low power consumption. The timing counter consists of century, year, month, day, date, hour, minute and second bits. External MPU can read or set the time as well as timer or alarmer when it is necessary. As exchanging data by the advance serial bus I2C, lines number on PCB can be reduced dramatically, which is very suitable in a complicated system.

特性 Features

? An external 32.768 kHz crystal is needed to generated time base

? Wide operating supply voltage range: 1.0 to 5.5 V

? Low back-up current; typical 0.25 μA at VDD = 3.0 V and Tamb = 25 °C

? 400 kHz two-wire I2C-bus interface (at VDD = 1.8 to 5.5 V)

? Programmable clock output for peripheral devices: 32.768 kHz, 1024 Hz 32 Hz and 1 Hz

? Alarm and timer functions

? Voltage-low detector

? Integrated oscillator capacitor

? Internal power-on reset

? I2C-bus slave address: read A3H; write A2H