PCF8553 datasheet(28/51 Pages) NXP

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NXP Semiconductors

PCF8553

40 × 4 LCD segment driver

Bit

Symbol

Value

Description

data read or write selection

write data

R/W

read data

6 to 5

default value

pointer to register start address

4 to 0

AP[4:0]

00h to 17h

valid range; other addresses are ignored

Table 15. Address byte definition

After the register address byte, the register contents follows with the address pointer

being auto-incremented after every eighth bit sent (see Section 7.1).

10.2.1.1 Write protocol

After the CE is set LOW, the PCF8553 requires that R/W and 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.

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.

• CE set LOW

• R/W = 0 and register address

• write data

• :

• write data

• CE set HIGH

aaa-011951

AP[4:0]

R/W default

SCL

SDIO

Data transfers are terminated by de-asserting CE (set CE to logic 1).

Figure 19. SPI-bus write example: writing two data bytes to registers 00h and 01h

10.2.1.2 Read protocol

When reading the PCF8553, reading starts at the defined position of the address pointer.

After setting the address pointer, the read can be executed. After each read, the address

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

18h.

• CE set LOW

PCF8553

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Product data sheet

Rev. 4 — 20 April 2021

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