TCA9546A: TCA9546A

Lynn Hsiao

Part Number: TCA9546A

Can you help to check if TCA9546 can use different PU power for each SD/SC0, SD/SC1, SD/SC2, SD/SC3?

Ex: I need P3V3 for Vcc, P3V3 for SDA/SCL, 1.8V for SD/SC0,1 ; 3.3v for ch2 and ch3.

+1 Clemens Ladisch over 3 years ago

Guru 316920 points

Yes; all five I²C bus segments can have different voltage.

The only restriction is the V_CC must not be too high; just use the lowest voltage (1.8 V).

0 Lynn Hsiao over 3 years ago in reply to Clemens Ladisch

If Vcc is 1.8V, 1.8V for SD/SC0,1 ; 3.3v for ch2 and ch3.

Which power rail should I used for ADDR,Reset and SDA/SCL?

+1 Clemens Ladisch over 3 years ago in reply to Lynn Hsiao

Guru 316920 points

The SDA/SCL pins are overvoltage tolerant. For Ax/RESET, use V_CC.

0 Lynn Hsiao over 3 years ago in reply to Clemens Ladisch

Is that means I can use P3V3 for SDA/SCL and P1V8 for Ax/RESET,, right?

+1 Clemens Ladisch over 3 years ago in reply to Lynn Hsiao

Guru 316920 points

Yes.

+1 Eric Schott1 over 3 years ago in reply to Clemens Ladisch

Thanks Clemens!

Hi Lynn,

Let us know if you have any more questions.

Regards,
Eric Schott

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