STM32G070CBT6 0.7V on input pin PD0 with external 10k pullup.

transistor · ‎2026-03-16

Hello i use STM32G070CBT6 with PD0 and others pins.

PD0 as input pin with no internal pull-up/down with extrenal 10k pullup gives only 0.7V, when i set the pin to output and set state to high there is 3.3V.

Where is the problem?

transistor · ‎2026-03-17

I used deactive dead battery pull-up. Thanks for help.

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TDK · ‎2026-03-16

What else is PD0 connected to externally? Show your schematic. Likely something externally is pulling it down. Enable the internal pullup/pulldown to quantify the change in the output level.

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transistor · ‎2026-03-16

PD1 and PD2 are connected in the same way and they work right.

gbm · ‎2026-03-16

PD0 is one of UCPD pins. Either connect PD1 to GND or disable the default operation in software. The topic was discussed many times.

My STM32 stuff on github - compact USB device stack and more: https://github.com/gbm-ii/gbmUSBdevice

Andrew Neil · ‎2026-03-16

@gbm wrote:
The topic was discussed many times.

Indeed.

@transistor - some examples:

https://community.st.com/t5/stm32-mcus-products/stm32g071-portd-pullups/m-p/881555

https://community.st.com/t5/stm32-mcus-products/stm32g0b0-writing-to-pd1-affects-pd0/m-p/699254

A complex system that works is invariably found to have evolved from a simple system that worked.
A complex system designed from scratch never works and cannot be patched up to make it work.

transistor · ‎2026-03-17

I used deactive dead battery pull-up. Thanks for help.