[SOLVED] How to rework input floating pin to pull-high

[Enshuo]

Hi experts,
Since there is a design error, we didn't add a pull-high resistor to an input pin. It's floating now and caused malfunction sometimes (the status should be active low). Are there any suggestions for quick rework on PCB? wire to another pull-high resistor? Many thanks!

 

[KlausST]

Hi,

Wiring it to a pull up resistor surely will not make it (active) LOW.

If you want it to be LOW, then you need to provide a valid low level at this pin.
Either it can be "configured" internally, or you ned to wire it externally.

Sadly you hide the IC type, the IC package, the PCB layout. Thus we are not able to give detailed assistence.

Klaus

 

[Enshuo]

Thanks, KS. It's Renesas IC. Checked with them. Can't solve by FW. Need to rework to wire it sadly.

 

[KlausST]

Hi,

It's Renesas IC.

...and Renesas only produces this one IC?

Klaus