LP5861: Max input current on VIO_EN pin

WST

Part Number: LP5861

Tool/software:

I'm planning on just tying the VIO_EN pin high, but was wondering why the datasheet doesn't specify the VIO_EN current when active.
I'm guessing that my uController could supply enough current using a typical GPIO since that is what the LP5861 datasheet says it can connect to (with a 1000pF cap near the pin), but the 5uA seems minimal and not the correct value for the OE_ function when the part is being programmed.

Is there a GPIO max current spec for this input?

2 months ago

0 Felix Wang 2 months ago

TI__Expert 5560 points

Hi WST,

There is not a spec for the VIO current when interface is in active mode.

But a typical GPIO of uController should supply enough current to the VIO_EN pin.

Best regards,

Felix

0 WST 2 months ago in reply to Felix Wang

Expert 1005 points

Have to say that the statement below from the datasheet is misleading. It seems to rule out a GPIO pin.

+1 Felix Wang 2 months ago in reply to WST

TI__Expert 5560 points

Hi WST,

The peak current of the VIO_EN occurs when the interface pin state is toggling. Based on the simulation data the peak current should be less than 5mA. As I know most GPIO should have the current capability. And there is a 1nF capacitor connected to the VIO_EN that can improve the voltage transient drop further.

Best regards,

Felix

0 WST 2 months ago in reply to Felix Wang

Expert 1005 points

Thanks for checking it out. The datasheet could be more clear, but from your answer it looks like a GPIO pin can be used with no issues.

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LP5861: Max input current on VIO_EN pin