TX pin current leak in deep sleep

[dontsov]

I have a LED connected to ESP TX pin.


The LED is very bright. When I turn off pin and call deepSleep the LED doesn't turn off fully. 4uA are leaking through pin. See the picture:


If i touch TX pin by oscilloscope it turned off and scheme consumption decreased. Sometimes it turned off by finger touch...

Code: Select all

 Serial.flush(); Serial.end();  --- doesn't help
twi_stop();    //turn off i2c line   --- doesn't help
ESP.deepSleep(0, RF_DEFAULT);
//..... 50 ms .....
// EN set to LOW by attiny

What I do wrong?

[ESP_houwenxiang]

Can you try to set tx pin to input mode when entering seep_mode?

[dontsov]

It doesn't help.
Interesting ,that if I don't use UART in my code I see TX only in booting (bootload message). During my loop LED is full OFF, but in deep sleep it shines dusk.

[ESP_Sprite]

4uA is very little... are you sure that e.g. contaminated flux isn't causing leakage from 3.3V? That would also explain why the LED is full off when not in deep sleep (as the pin is driven hard-low then)