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TXB0106: Question of configuration

Part Number: TXB0106

Hi team,

Can you advise what is the problem for below configuration?

-. The SPI bus voltage between TXB0106 (B side) and Device is about 2V, not 5V and TXB0106(A side) keep 0V. 

-. Not detailed info for the device except for 5V I/O, and it works between MCU A and Device when disconnecting TXB0106.

Thanks,

Sam Lee