I'm trying to use the Deep Sleep feature of the ESP8266 with an inexpensive ESP-01 module. These need to be modified to bridge GPIO16 to RST, in order to wake up from deep sleep. Also, I have removed the power LED.
I'm using the Arduino implementation. The device enters deep sleep for the specified amount, and wakes up. The problem is: most specs state in this mode, current draw should be in the "sub-100uA" range. I'm seeing about 3mA.
I have lifted all pins, even the FLASH chip VDD, but I simply can't seem to reduce the current draw. I have measured with two different instruments and the current reads the same, about 3mA.
There is no regulator in the circuit as it's all running from a lab supply for now.