User manual

CHAPTER 4

THE PCF8563 CMOS REAL-TIME CLOCK

4. Introduction to the chapter

In this chapter is located the information about the heart of MOD-RTC. The information is a

modified version of the datasheet provided by its manufacturers.

4.1 The PCF8563

• Provides year, month, day, weekday, hours, minutes, and seconds based on

• 32.768 kHz quartz crystal

• Century flag

• Clock operating voltage: 1.0 V to 5.5 V at room temperature

• Low backup current; typical 0.25 A 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, 1.024 kHz, 32 Hz, and 1

Hz)

• Alarm and timer functions

• Integrated oscillator capacitor

• Internal Power-On Reset (POR)

• I2C-bus slave address: read A3h and write A2h

• Open-drain interrupt pin

For comprehensive information on the PCF8563 visit the NXP’s web page for a datasheet. It is

highly recommended to have a look at that datasheet.

At the moment of writing the microcontroller datasheet can be found at the following link:

http://www.nxp.com/documents/data_sheet/PCF8563.pdf

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