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TCA9617A: About the necessity of high pulse of SDA after the first ACK of TCA9617A

user1492423
Prodigy 70 points
Part Number: TCA9617A
In Figure 7. of the TCA9617A data sheet, there is a high pulse on the SDA line while SCL is LOW after Acknowledge.
Is this high pulse necessary to operate the TCA9617A properly?
  • 0
    TI__Guru 73181 points
    Hey User,

    TCA9617A is a repeater, which means it will just repeat what it sees on the input to the output. Figure 7 that you are referencing shows a master writing to a slave and the slave releasing the SDA line after ACKing (the master does not retake control of the SDA line or try to drive it low). This is just an example of what communication with the device could look like. If you do not want to drive the signal high after the ACK then that is up to the master, our device will not care if you decide to drive high or low, it only copies who ever is driving low.

    "Is this high pulse necessary to operate the TCA9617A properly?"

    Short answer: No, this was just an example where SDA got released and went to a logic high state because no one drove SDA low.

    Thanks,
    -Bobby