HDC3020: Can HDC3020 be reverse bias via I2C resistors when device is non-powered?

Björn Hellerstedt

Part Number: HDC3020

I have a question regarding HDC3020.

The device itself is supplied via +3.3VDD2 and the pulp-up resistors for I2C are supplied via +3.3VDD1.

If +3.3VDD2 is switched off ( 0V ) but +3.3VDD1 is still active ( pull-up resistors ).

Is there any chance for HDC2030 to be "reversed supplied" via I2C resistors and causing a problem on the I2C bus since other devices will use this bus when HDC2030 is switched off.

Is this state acceptable ?

Thank you for your help!

over 1 year ago

0 Alex Thompson over 1 year ago

TI__Genius 12585 points

Hi Bjorn,

It will not be a problem to have VDD to the HDC3020 go to 0V and the SDA & SCL pins still pulled to 3.3V via a pull-up resistor. There is no ESD connection from those two pins to VDD to create a "reverse supplied" situation.

Regards

-Alex Thompson

0 Björn Hellerstedt over 1 year ago

Prodigy 190 points

Thank you for your help!

0 Björn Hellerstedt over 1 year ago in reply to Alex Thompson

Prodigy 190 points

Thank you for your answer. Great

Sensors

Sensors forum

HDC3020: Can HDC3020 be reverse bias via I2C resistors when device is non-powered?