Description
The reset state of GPIO pins contains weak pullup (40-47K ~80uA). This cause spureous output activation in reset state and program download.
The output pulldown is 100K for CIAA-NXP and 330K for EDU-CIAA. this put the FET or BJT in polarized state.
FIX recomendation
- Shrink the pulldown to ~10K due to prevent output transistor polarization, or...
- Invert activation polarity of output circuit, or...
- Detect in and-fashion circuit reset condition and disable all outputs
Description
The reset state of GPIO pins contains weak pullup (40-47K ~80uA). This cause spureous output activation in reset state and program download.
The output pulldown is 100K for CIAA-NXP and 330K for EDU-CIAA. this put the FET or BJT in polarized state.
FIX recomendation