PCF8536AT datasheet(28/53 Pages) NXP

28 / 53 page

NXP Semiconductors

PCA8551

Automotive 36 × 4 LCD segment driver

10.1.4 I2C interface protocol

The PCA8551A uses the I2C interface for data transfer. Interpretation of the data is

determined by the interface protocol.

10.1.4.1 Write protocol

After the I2C slave address is transmitted, the PCA8551A requires that the register

address pointer is defined. It can take the value 00h to 17h. 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 has been 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 17h, the address pointer stops

incrementing at 18h.

• I2C START condition

• I2C slave address + write

• start register pointer

• write data

• :

• write data

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

10.1.4.2 Read protocol

When reading the PCA8551A, 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

• start address pointer

• 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 PCA8551A will immediately output read data. After each read,

the address pointer increments by one. After address 17h, the address pointer stops

incrementing at 18h.

• I2C START condition

• I2C slave address + read

• read data (master sends acknowledge bit)

• :

10.1.4.3 I2C-bus slave address

Device selection depends on the I2C-bus slave address (see Table 12).

PCA8551

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Product data sheet

Rev. 3.1 — 3 May 2021

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