PCF85263ATLSLASHA datasheet(60/92 Pages) NXP

60 / 92 page

NXP Semiconductors

PCF85263A

Tiny Real-Time Clock/calendar with alarm function, battery switch-over, time stamp input, and I2C-bus

• read data (master sends acknowledge bit)

• :

• read data (master sends not-acknowledge bit)

• I2C STOP condition. An I2C RE-START condition is also possible.

The master must indicate that the last byte has been read by generating a not-

acknowledge after the last read byte.

9.3 Slave addressing

9.3.1 Slave address

One I2C-bus slave address (1010 001) is reserved for the PCF85263A. The entire I2C-

bus slave address byte is shown in Table 64.

Slave address

Bit

MSB

LSB

R/W

Table 64. I2C slave address byte

After a START condition, the I2C slave address has to be sent to the PCF85263A device.

Slave address can also be written in a hexadecimal format:

• A2h - Write slave address

• A3h - Read slave address

10 Application design-in information

In this application, stop-watch mode is used to implement an elapsed time counter. The

TS pin is used with a mechanical switch to start and stop the time. Each time the time is

stopped, timestamp2 is loaded with the current time and an interrupt is generated on the

INTA pin.

PCF85263A

All information provided in this document is subject to legal disclaimers.

Product data sheet

Rev. 5 — 1 February 2021

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PCF85263ATL/A Datasheet(PDF) 60 Page - NXP Semiconductors