CC1352P: why is low on GPIO/Input pin draws about 1mA current out of MCU?

Zhiyong Li (FT)

Part Number: CC1352P

Hi,

When we were experimenting on GPIO pin interrupt, we noticed when DIO_22 is connected to another MCU, if the other MCU sets DIO_22 low, there will be an extra 1mA drawn out of CC1352P, and none when the other MCU sets DIO_22 high.

My question is, why this happens? and how do we limit this current draw? We tried to put some resistor in series. That didn't work. GPIO interrupt doesn't fire.

Thanks in advance.

over 3 years ago

0 TER over 3 years ago

TI__Guru**** 317180 points

Which harware are you using? If you are using a custom board, please share a schematic.

0 Zhiyong Li (FT) over 3 years ago in reply to TER

Expert 2450 points

CC1352P1 launchpad. I just connected both GND and DIO_22 to a STM32 nucleo board.

TER said:

Which harware are you using? If you are using a custom board, please share a schematic.

0 TER over 3 years ago in reply to Zhiyong Li (FT)

TI__Guru**** 317180 points

If you look at the schematic for the CC1352P-1 LP () you will see that this DIO has a 3.3 k pull-up since this is prepeared for I2C.

The best is to select a DIO without pull-up or remove the pull-up if you don't need it.

0 Zhiyong Li (FT) over 3 years ago in reply to TER

Expert 2450 points

That's embarrassing but thanks.

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CC1352P: why is low on GPIO/Input pin draws about 1mA current out of MCU?