TCA9511A: EN is not connected to VCC.

Charlie Xiao

Part Number: TCA9511A

Hi Team,

If EN is not connected to VCC, but to another power supply, and pull up the output signal (SDA_OUT/SCL_OUT) to the power supply where the EN pin is located, is there any risk in this use? Thanks.

Regards, Charlie

over 1 year ago

+1 Clemens Ladisch over 1 year ago

Guru 271360 points

EN and the I/O pins are overvoltage tolerant.

The I/O pins work with any supply. The EN pin requires a high-level voltage of at least 0.7 × V_CC.

+1 BOBBY over 1 year ago

TI__Guru 56660 points

Charlie,

There shouldn't be any issues in the situation you've provided. As long as you provide a high enough bias on EN (as clemens pointed out) then the device should work. If the EN voltage is higher than the Vcc voltage, you may see some slight leakage current but it shouldn't affect the operation/application.

-Bobby

0 Charlie Xiao over 1 year ago in reply to BOBBY

TI__Expert 5400 points

Hi Bobby,

Thanks for your update. What if the voltage of EN is equal to the voltage of VCC? How does slight leakage current arise? Thanks.

Regards, Charlie.

0 Charlie Xiao over 1 year ago in reply to Clemens Ladisch

TI__Expert 5400 points

Thanks Clemens.

Interface

Interface forum

TCA9511A: EN is not connected to VCC.