JAJSKX7A July 2021 – December 2021 TCA9536
PRODUCTION DATA
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Following the successful acknowledgment of the address byte, the bus controller sends a command byte that is stored in the control register in the TCA9536. This data byte state the operation (read or write) and the internal register (Input, Output, Polarity Inversion, Configuration, or Special Function) that will be affected. This register can be written or read through the I2C bus. The command byte is sent only during a write transmission.
Once a command byte has been sent, the register that was addressed continues to be accessed by reads until a new command byte has been sent.
COMMAND BYTE (HEX) | REGISTER | PROTOCOL | POWER-UP DEFAULT |
---|---|---|---|
0x00 | Input Port | Read byte | 1111 XXXX |
0x01 | Output Port | Read/write byte | 1111 1111 |
0x02 | Polarity Inversion | Read/write byte | 0000 0000 |
0x03 | Configuration | Read/write byte | 1111 1111 |
0x50 | Special Function | Read/write byte | 0000 0000 |