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PCAL6408A

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Product data sheet

Rev. 3 — 18 September 2013

15 of 49

NXP Semiconductors

PCAL6408A

Low-voltage translating, 8-bit I2C-bus/SMBus I/O expander

Bus transactions

The PCAL6408A is an I2C-bus slave device. Data is exchanged between the master and

PCAL6408A through write and read commands using I2C-bus. The two communication

lines are a serial data line (SDA) and a serial clock line (SCL). Both lines must be

connected to a positive supply via a pull-up resistor when connected to the output stages

of a device. Data transfer may be initiated only when the bus is not busy.

8.1 Write commands

Data is transmitted to the PCAL6408A by sending the device address and setting the

Least Significant Bit (LSB) to a logic 0 (see Figure 7 for device address). The command

byte is sent after the address and determines which register receives the data that follows

the command byte. There is no limitation on the number of data bytes sent in one write

transmission.

Fig 10. Write to Output port register

slave address

START condition

R/W

acknowledge

from slave

002aaf825

0000001

command byte

acknowledge

from slave

12345678

SCL

SDA

DATA 1

write to port

data out from port

tv(Q)

acknowledge

from slave

DATA 1 VALID

data to port

10000

STOP

condition

Fig 11. Write to Configuration or Polarity inversion registers

slave address

START condition

R/W

acknowledge

from slave

002aah090

1/0 0

0 1/0 1/0 1/0

command byte

acknowledge

from slave

12345678

SCL

SDA

DATA 1

acknowledge

from slave

data to register

10000

STOP

condition

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