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TXB0104

Rakesh Hegden

Prodigy 20 points

Other Parts Discussed in Thread: TXB0104

Hello Myself Rakesh,

We are using the TXB0104 to convert a 3.3V SPI Signal to 2.5 and vice versa, But when we are trying the output is not coming as expected i.e. the level translation is not happening properly. The SPI Speed is 1 MHz, Here with I am attaching the schematic of the circuit and the input and output wave forms we captured input circuit.

over 11 years ago

0 Michael Peffers over 11 years ago

TI__Mastermind 20820 points

Hi Rakesh,

The TXB0104 is supported by the logic group so I am going to move this post over to their forum.

0 Wei Lang over 11 years ago in reply to Michael Peffers

TI__Expert 6430 points

Hi Rakesh,

Any pull-down or pull-up resistor on B side port? If yes, please remove them and test again.

Thanks

Wei

0 Rakesh Hegden over 11 years ago in reply to Wei Lang

Prodigy 20 points

Hi Wei,

There is no pull up or pull down resistors in the A or B Side.

Thanks

Rakesh

0 Wei Lang over 11 years ago in reply to Rakesh Hegden

TI__Expert 6430 points

Hi Rakesh,

The possible reason is B side output capacitor load is great. Could you remove B side SPI slaver and test again? How long PCB trace on B side pins?

Thanks

Wei