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PCA9534A: Register access

Adiel Freiman
Prodigy 10 points
Part Number: PCA9534A

Hey, we tend to use this device on our board.

In a case of write operation, when the master send the command byte wrong with a sixth 6 MSbits other than zeros ("0") how would the slave acts? 

For example instead of 0x03 it sends 0x83 or 0x23, would the slave send a "NACK" back or nevertheless bring an access to the configuration register?

  • 0
    TI__Mastermind 42023 points

    Adiel,

    The 9534A slave device should NACK if you send a control register address of something other than all zeroes for the first 4 bits i.e. 0x83 and 0x23 would not be recognized as the configuration register, and device should NACK, since this is not in the register map. 

    0x00 - 0x03 should be the only command bytes that ACK for this device.

    Regards,

    Tyler