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PCF8564A_10 Datasheet, PDF (1/45 Pages) NXP Semiconductors – Real time clock and calendar | |||
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PCF8564A
Real time clock and calendar
Rev. 02 â 30 September 2010
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 and benefits
 Provides year, month, day, weekday, hours, minutes, and seconds based on a
32.768 kHz quartz crystal
 Century flag
 Wide clock operating voltage: 1.0 V to 5.5 V
 Low back-up current typical 250 nA at 3.0 V and 25 °C
 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
3. Applications
 Mobile telephones
 Portable instruments
 Electronic metering
 Battery powered products
1. The definition of the abbreviations and acronyms used in this data sheet can be found in Section 20.
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