TXS0102: TXS0102 affect I2C communication

Yvan Young

Part Number: TXS0102
Other Parts Discussed in Thread: TCA9800, LSF0102

Txs0102 performs level conversion on I2C, and there is a spike when the clock and data switch, resulting in communication failure. How to solve this phenomenon?

over 3 years ago

0 Clemens Ladisch over 3 years ago

Guru 317370 points

I do not see any spikes that would be large enough to be harmful.

Anyway, this looks like insufficient decoupling, or crosstalk between the SCL/SDA traces. Are you using any cables? Can you increase the distance between the I²C traces, or place a ground trace between them?

0 Yvan Young over 3 years ago in reply to Clemens Ladisch

Prodigy 30 points

Yes， the cables is about 20 cm. But when Txs0102 is not used, the signal is normal.

0 Clemens Ladisch over 3 years ago in reply to Yvan Young

Guru 317370 points

The TXS is designed for high-speed signals, and generates fast edges.

If you cannot reduce the crosstalk of that cable, use a slower translator like the TCA9800.

0 Dylan Hubbard over 3 years ago in reply to Clemens Ladisch

TI__Mastermind 46045 points

Hi Yvan,

To add to Clemens suggestion, you can also use the LSF0102 device which also supports I2C translation. It lacks edge rate acceleration, so it will likely not face the same crosstalk issues.

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TXS0102: TXS0102 affect I2C communication