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PCA9545A: To access Control register

Sibasish Pattanaik
Prodigy 60 points
Part Number: PCA9545A

I have connected A0 and A1 to Ground. So device address is 0x70.

How to access "Control Register". This register has no address.

How to write data to "Control Register" to enable different channels.

  • +1
    TI__Genius 15345 points

    Hello,

    The control registers is accessed by directly writing to the device as shown below:

    The control register is the only register in the device so there is no address for it. You send your device address along with the write bit. After the ACK from you device you send the byte that you want to write to the control register. So it just take two bytes of data.

    Let me know if that makes sense or if you have any questions.

    Best,

    Chris