PCF8564A Datasheet, PDF (1/44 Pages) NXP Semiconductors – Real time clock and calendar

PCF8564A
Real time clock and calendar
Rev. 1 — 8 October 2009
Product data sheet
1. General description
The PCF8564A is a CMOS¹ 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.
2. Features
I Provides year, month, day, weekday, hours, minutes, and seconds based on a
32.768 kHz quartz crystal
I Century flag
I Wide clock operating voltage: 1.0 V to 5.5 V
I Low back-up current typical 250 nA at 3.0 V and 25 °C
I 400 kHz two-wire I²C interface (1.8 V to 5.5 V)
I Low-voltage detector
I Alarm and timer functions
I Two integrated oscillator capacitors
I Programmable clock output for peripheral devices (32.768 kHz, 1.024 kHz, 32 Hz and
1 Hz)
I Internal Power-On Reset (POR)
I I²C slave address: read A3h, write A2h
3. Applications
I Mobile telephones
I Portable instruments
I Electronic metering
I Battery powered products
1. The definition of the abbreviations and acronyms used in this data sheet can be found in Section 20.