TCAN1044V-Q1: how to deal with Vio for 5V system

Aki Li

Part Number: TCAN1044V-Q1

Customer would like to use TCAN1044V-Q1 for their MCU with 5V. Should they directly connect VIO to VCC? And they used 100nF+10uF for VCC now, should they also use the same 2 caps for Vio?

over 4 years ago

+1 Clemens Ladisch over 4 years ago

Guru 316440 points

V_CC and V_IO can be the same.

There should be 100 nF near each supply pin; see section 10 of the datasheet. (If the two capacitors end up near each other, you can merge them, but then they would not be near their pins.)

0 Aki Li over 4 years ago in reply to Clemens Ladisch

TI__Genius 9735 points

Clemens,

Thank you. Is bypass capacitor like 10uF required for Vio, in addition to 100nf?

+1 Eric Schott1 over 4 years ago in reply to Aki Li

TI__Guru 53515 points

Thanks Clemens!

Hi Aki,

No, there does not need to be a unique 10µF capacitor for Vio if one is already present for Vcc. The bulk capacitance supplied by this capacitor is mainly needed for the relative large and dynamic current draw from the Vcc pin. Only the 100nF capacitors are required for each supply pin as Clemens described.

Let us know if you have any more questions.

Regards,
Eric Schott

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TCAN1044V-Q1: how to deal with Vio for 5V system