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Multiple voltage level on I2C with TXS0102

Mattias Moritz
Prodigy 60 points
Other Parts Discussed in Thread: OMAP3530, TXS0102, TXB0102

Hello,

we need to connect devices with different voltages (5V, 3V) to an OMAP3530 I2C (1.8V).

Currently we are using the TXS0102 to convert five I2C devices from 5V to 1.8V. Now we need to connect only one 3V device on the same I2C Bus.

Is it possible to wire an additional (parallel)  TXS0102 on the OMAP 1.8V (VCCA) side of the bus to perform the conversion to 3V ?

Or would a TXB0102 be a better fit because the TXS0102 has internal pullups ?

Thanks,

Mattias

 

 

  • 0
    TI__Intellectual 2286 points

    Hey Mattias,

    Using the TXS0102 in a parallel fashion to the main I2C line should not be a problem. You are running to only one specific 3V peripheral device, right? Not multiples?

    TXS0102 is optimized for open-drain applications, so it would be a better fit for this application compared to the TXB0102.

     

    Thanks, Dwight