PCA8553DTTSLASHAY datasheet(27/52 Pages) NXP

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NXP Semiconductors

PCA8553

Automotive 40 × 4 LCD segment driver

10.1.4 I2C interface protocol

The PCA8553 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 target address is transmitted, the PCA8553 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 target 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 target 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 PCA8553, 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 target 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 target address is

transmitted, the PCA8553 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 target address + read

• read data (controller sends acknowledge bit)

10.1.4.3 I2C-bus target address

Device selection depends on the I2C-bus target address. Four different I2C-bus target

addresses can be used to address the PCA8553 (see Table 12).

PCA8553

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Product data sheet

Rev. 4 — 1 October 2021

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