PCA8565: Real-time clock/calendar

Overview

The PCA8565A is a CMOS Real-Time Clock (RTC) 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.

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Features

AEC-Q100 compliant for automotive applications
Provides year, month, day, weekday, hours, minutes, and seconds based on 32.768 kHz quartz crystal
Clock operating voltage: 1.8 V to 5.5 V
Extended operating temperature range: -40 °C to +125 °C
Low backup current: typical 0.65 μA at V_DD = 3.0 V and T_amb = 25 °C
400 kHz two-line I²C-bus interface (at V_DD = 1.8 V to 5.5 V)
Programmable clock output for peripheral devices (32.768 kHz, 1.024 kHz, 32 Hz, and 1 Hz)
Alarm and timer functions
Two integrated oscillator capacitors
Internal Power-On Reset (POR)
I²C-bus slave address: read A3h; write A2h
Open-drain interrupt pin

Target Applications

Automotive
Industrial
Applications that require a wide operating temperature range

MoreLess

Features

AEC-Q100 compliant for automotive applications
Provides year, month, day, weekday, hours, minutes, and seconds based on 32.768 kHz quartz crystal
Clock operating voltage: 1.8 V to 5.5 V
Extended operating temperature range: -40 °C to +125 °C
Low backup current: typical 0.65 μA at V_DD = 3.0 V and T_amb = 25 °C
400 kHz two-line I²C-bus interface (at V_DD = 1.8 V to 5.5 V)
Programmable clock output for peripheral devices (32.768 kHz, 1.024 kHz, 32 Hz, and 1 Hz)
Alarm and timer functions
Two integrated oscillator capacitors
Internal Power-On Reset (POR)
I²C-bus slave address: read A3h; write A2h
Open-drain interrupt pin