NRF52832-QFAA-R GPIO abnormal

[Albert Qiu]

Hi Nordic expert,

We are K5DET1/3/5/7/9/11 output high level, then string 10K resistor, K5DET2/4/6/8/10/12 through the mercury switch to read this high level, while adding 1M puldown resistor.

Normally, after the mercury switch is on, the K5DET2-12 pin level should be about 3.6V, but some pins will actually measure 1.2, 1.8, 2.1 and other abnormal levels.

Please help to check whether there is any problem with the hardware. What may cause an I/O exception?

The battery is a lithium sub battery with an open circuit voltage of 3.66V and a maximum continuous discharge current of 50MA.

Looking forward to your professional answers,,thanks.

 

[Kazi Afroza Sultana]

Hello,

I have few questions-

1. K2DET2,K2DET4,K2DET6,K2DET8,K2DET10,K2DET12 Are these using the 1M Ohm resistor?

2. K5DET1,3,5,7,9,11 are using the 10K Ohm,

3. Is the voltage issue on both the GPIO's that have 10K and 1M Ohm pulldowns?

Moreover it would be good if you would send a clear schematic of this design. This is a bit blur image.

Thanks.

BR

Kazi

[Albert Qiu]

Hi  nordic expert

Can you give me some suggestions or solutions to the problem? thank you.