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TPS25750: I2C address setting question

Part Number: TPS25750

Hello expert,

My customer is using TPS25750D and have a question on I2C address setting (by the way you might need to also upload the voltage divider table mapping with decoder value in datasheet). We measured ADCIN1 and ADCIN2 voltage is 0.983V(7) and 0.563(5), based on datasheet we should map to I2C address index #1 which is 0x20. But customer can only find the device at 0x21 but cannot find device at 0x20. May we know if anything else we need to check to know the root cause? Thanks a lot!

Best regards,

Ann Lien