TPA2028D1: Using EN Control to Share I2C Bus Between 2 Amps

Antonio Fadhel

Part Number: TPA2028D1

Hi Team,

Is it possible to have 2 TPA2028D1 on the same I2C bus (same address) as long as one is disabled via the EN pin while the other is communicating with the master? Disabling the IC seems to make the I2C pins high impedance so it looks feasible, but just want to confirm that I'm not missing anything.

Thanks,
Antonio

over 5 years ago

0 Ivan Salazar over 5 years ago

TI__Guru* 95335 points

Hi Antonio,

As you mention, this seems feasible. I would only test if registers from TPA2028D1 are not erased by pulling EN pin low.

Best regards,
-Ivan Salazar
Applications Engineer - Low Power Audio & Actuators

0 Antonio Fadhel over 5 years ago in reply to Ivan Salazar

TI__Genius 9410 points

Hi Ivan,

That is my main concern. Can you please confirm that the registers will not be erased? My customer would need to know before they decide to move forward with the amp on their design.

Thanks,
Antonio

0 Ivan Salazar over 5 years ago in reply to Antonio Fadhel

TI__Guru* 95335 points

Antonio,

I tried this on a EVM. Unfortunately the registers are erased when EN pins is pulled down.

Best regards,
-Ivan Salazar
Applications Engineer - Low Power Audio & Actuators

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TPA2028D1: Using EN Control to Share I2C Bus Between 2 Amps