PCF8563T SOP8 8-bit ADC DAC Real - time Clock Timing IC chip

1. General description

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

■ Century flflag

■ Clock operating voltage: 1.8 V to 5.5 V

■ Low backup 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 V 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

■ ElectroStatic Discharge (ESD) protection exceeds 2000 V Human Body Model (HBM) per JESD22-A114,

200 V Machine Model (MM) per JESD22-A115 and 2000 V Charged Device Model (CDM) per JESD22-C101

■ Latch-up testing is done to JEDEC standard JESD78 which exceeds 100 mA

■ plastic small outline package; 8 leads; body width 3.9 mm

3. Applications

■ Mobile telephones

■ Portable instruments

■ Electronic metering

■ Battery powered products

4.Functional description

The PCF8563 contains sixteen 8-bit registers with an auto-incrementing address register,

an on-chip 32.768 kHz oscillator with one integrated capacitor, a frequency divider which

provides the source clock for the Real-Time Clock/calender (RTC), a programmable clock

output, a timer, an alarm, a voltage-low detector and a 400 kHz I2C-bus interface.

All 16 registers are designed as addressable 8-bit parallel registers although not all bits

are implemented. The fifirst two registers (memory address 00h and 01h) are used as

control and/or status registers. The memory addresses 02h through 08h are used as

counters for the clock function (seconds up to years counters). Address locations 09h

through 0Ch contain alarm registers which defifine the conditions for an alarm.

Address 0Dh controls the CLKOUT output frequency. 0Eh and 0Fh are the timer control

and timer registers, respectively.

The seconds, minutes, hours, days, weekdays, months, years as well as the minute alarm,

hour alarm, day alarm and weekday alarm registers are all coded in Binary Coded

Decimal (BCD) format.

When one of the RTC registers is read the contents of all counters are frozen. Therefore,

faulty reading of the clock/calendar during a carry condition is prevented.

4.1 Alarm function modes

4.2 Timer

4.3 Clock output

4.4 Reset

4.5 Voltage-low detector

4.6 Register organization

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