TCA9548A: Vcc, Reset, A0-A2, PU levels

Ishay Shavit24

Part Number: TCA9548A
Other Parts Discussed in Thread: TPS3808

Hi,

I'm having a design which I got a global reset signal (TPS3808), pulled to 1.8V, and I want to connect it to the TAC9548A.

Do I need a level translation, or that I can connect VCC, A0-A2 and RESET to 1.8V level power/signal?

The master side is 3.3V, and the slave side is a mix of 3.3V and 1.8V.

Thanks.

over 6 years ago

0 Ishay Shavit24 over 6 years ago

Intellectual 310 points

Prepared schematic

0 BOBBY over 6 years ago

TI__Guru 72161 points

Hey Ishay,

"VCC, A0-A2 and RESET to 1.8V level power/signal?"
If your lowest pull up voltage is 1.8V I would recommend you use Vcc at 1.8V which would also allow for A0-A2 and reset to be tied to 1.8V.

If you make Vcc of this device 3.3V you are violating Figure 14 of the datasheet which would mean your device not separate the 1.8V and 3.3V rails correctly.

BTW i cannot see your schematic.

Thanks,
-Bobby

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TCA9548A: Vcc, Reset, A0-A2, PU levels