Re: GPIO15 remains high. Is this normal??
Posted: Thu Jul 20, 2017 10:25 amThe 10k ohm resistor is sufficient. Look at GPIO15 chip restarting chart https://www.mjt.me.uk/posts/esp8266-gpio-deep-sleep-and-reset/
ESP8266 Community Forum
Open Community Forum for ESP8266, Come share Arduino and IoT (Internet of Things)
https://www.esp8266.com/
GPIO15 remains high. Is this normal??
Page 2 of 2
Posted: Thu Jul 20, 2017 10:25 amRe: GPIO15 remains high. Is this normal??
Posted: Thu Jul 20, 2017 12:58 pmEspressif uses 12.5K pull down on their ESP-12S modules. I don't believe pull ups are enabled on GPIO15. EDIT: see below posts
Re: GPIO15 remains high. Is this normal??
Posted: Fri Jul 21, 2017 5:01 amThe chart referred to indicates a weak pull up on GPIO15 with reset pulled low.
That is same as what I find and on the ESP-12F modules I measure it at around 37K. 12.5K pulls that down to 0.83V (3.3V supply). I find that a bit marginal for a reliable logic 0 which is supposed to be below 0.25xVd
Obviously the weak pull up will vary a bit but I can't find a spec on its limits.
That is same as what I find and on the ESP-12F modules I measure it at around 37K. 12.5K pulls that down to 0.83V (3.3V supply). I find that a bit marginal for a reliable logic 0 which is supposed to be below 0.25xVd
Obviously the weak pull up will vary a bit but I can't find a spec on its limits.
Re: GPIO15 remains high. Is this normal??
Posted: Fri Jul 21, 2017 7:38 amI measured one of my ESP8266 modules and I see the same weak pull up on reset on GPIO15. Pretty dumb.