PCF85263ATLSLASHA datasheet(59/92 Pages) NXP

59 / 92 page

NXP Semiconductors

PCF85263A

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

When written to, the slave will generate an acknowledge after the reception of each byte.

After the acknowledge, another byte may be transmitted. It is also possible to send a

STOP or START condition.

When read from, the master receiver must generate an acknowledge after the reception

of each byte. When the master receiver no longer requires bytes to be transmitter, it

must generate a not-acknowledge. After the not-acknowledge, either a STOP or START

condition must be sent.

A detailed description of the I2C-bus specification is given in [8].

9 Interface protocol

The PCF85263A uses the I2C interface for data transfer. Interpretation of the data is

determined by the interface protocol.

9.1 Write protocol

After the I2C slave address is transmitted, the PCF85263A requires that the register

address pointer is defined. It can take the value 00h to 2Fh. Values outside of that

range will result in the transfer being ignored, however the slave will still respond with

acknowledge pulses.

After the register address is transmitted, write data is transmitted. The minimum number

of data write bytes is 0 and the maximum number is unlimited. After each write, the

address pointer increments by one. After address 2Fh, the address pointer will roll over

to 00h.

• I2C START condition

• I2C slave address + write

• register address

• write data

• :

• write data

• I2C STOP condition; an I2C RE-START condition is also possible.

9.2 Read protocol

When reading the PCF85263A, reading starts at the current position of the address

pointer. The address pointer for read data should first be defined by a write sequence.

• I2C START condition

• I2C slave address + write

• register address

• I2C STOP condition; an I2C RE-START condition is also possible.

After setting the address pointer, a read can be executed. After the I2C slave address

is transmitted, the PCF85263A will immediately output read data. After each read, the

address pointer increments by one. After address 2Fh, the address pointer will roll over

to 00h.

• I2C START condition

• I2C slave address + read

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) 59 Page - NXP Semiconductors

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