PCA9306 VEN&VREF2 > SCL&SDA

Tomohiko Sugiyama

Intellectual 815 points

If VEN&VREF2 is larger than SCL&SDA ,will be problems ?

For example

Vref1&SCL1&SDA1=+1.2V(pull up)

VEN&VREF2=3.3V CMOS (High:3.2V~3.3V,Low:0V~0.1V)

SCL&SDA = +3.3V (pull up)

I'm worried about the state of VEN & VREF2 = 3.2V.

Best regards

over 12 years ago

0 Chris Kraft over 12 years ago

TI__Intellectual 2020 points

Hi Tomohiko,

There is no concern with VEN & VREF2 at 3.2V instead of 3.3V as long as the 200k ohm resistor is included. There will be a voltage drop across the 200k ohm resistor that will set the voltage at VREF2 and EN pins to roughly VREF1 + 0.6V. This means there is no concern having the voltage at 3.2V.

Regards
Chris Kraft

0 Tomohiko Sugiyama over 12 years ago in reply to Chris Kraft

Intellectual 815 points

Hi Chris-san ,

Thank you for the Answer .

Best regards

Tomohiko

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PCA9306 VEN&VREF2 > SCL&SDA