PCF85363ATLSLASHAX datasheet(59/86 Pages) NXP

59 / 86 page

NXP Semiconductors

PCF85363A

Tiny Real-Time Clock/calendar with 64 byte RAM, alarm function, battery switch-over time stamp input,

and I2C-bus

9 Interface protocol

The PCF85363A 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 PCF85363A 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 PCF85363A, 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 PCF85363A 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

• 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

PCF85363A

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

Product data sheet

Rev. 3.1 — 18 June 2021

59 / 86

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