I wasn't suggesting a 1M resistor is a good pull-down. However, it does have applications. We have a generic implementation of capacitive touch which uses a 1M pull-down. We pull the pin up by switching to an output, then switch it back to being an input, and measure how long it takes to go back to being read as low. When I filed https://github.com/raspberrypi/pico-feedback/issues/401, I was debugging why our touch implementation wasn't working.
On RP2040 and other chips, the pin does go to low. On RP2350, it never does, because of the "stuck" nature of the E9 problem.And the 60-80k internal pulldown is not good enough to unstick the input either.
On RP2040 and other chips, the pin does go to low. On RP2350, it never does, because of the "stuck" nature of the E9 problem.And the 60-80k internal pulldown is not good enough to unstick the input either.
Statistics: Posted by dhalbert — Mon Sep 16, 2024 9:29 pm