General description

The PCA8565 is a CMOS real time clock/calendar optimized for low power consumption. A programmable clock output, interrupt output and voltage-low detector are also provided. All address 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.

Features

Provides year, month, day, weekday, hours, minutes and seconds based on 32.768 kHz quartz crystal

Century flag

Clock operating voltage: 1.8 to 5.5 V

Extended operating temperature range:−40 to +125°C

Low backup current; typical 0.5µA 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

Integrated oscillator capacitor

Internal power-on reset

I2C-bus slave address: read A3H and write A2H

Open-drain interrupt pin.

Applications

Automotive

Industrial

Other applications that require a wide operating temperature range.