LSF0102: Vref_A and Vref_B voltage selection

Rock Su

Intellectual 2220 points

Part Number: LSF0102
Other Parts Discussed in Thread: TXS0102

Dear colleague,

Our customer wants to use realize 1.2V and 1.8V transition based on I2C.

But we find it in datasheet, we don't know which one is right.

Thanks a lot!

Best Regards,

Rock Su

over 3 years ago

0 Clemens Ladisch over 3 years ago

Guru 243180 points

The high-level signal voltages are determined only by the pull-up resistors on the signals. The Vref_A/Vref_B voltages are independent from those.

Just connect Vref_A to 1.2 V, and the Vref_B resistor to 2.5/3.3/5 V.

Using the TXS0102 instead would save the five external resistors.

0 Rock Su over 3 years ago in reply to Clemens Ladisch

TI__Intellectual 2220 points

We need 1.2<->1.8V

0 Clemens Ladisch over 3 years ago in reply to Rock Su

Guru 243180 points

As I already said above, and as shown in the last line of table 4, and in section 9.2.2 of the datasheet, the Vref voltages are independent from the signal voltages.

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LSF0102: Vref_A and Vref_B voltage selection