- Wed Mar 23, 2016 11:25 am
#43889
I'm working on the Wi-T kit. I found out that most of the current was sinking on the regulator (almost 3.5mA). I took off the built-in LED and light sensor; then I installed a pin on the capacitor and powered the chip directly by 3.3V. The current went below 100mA.
While in deep sleep mode, the built-in LED was still slightly ON. So there might be some sinking current as you said. I think this can be dealed with by using pull-up resistors.
Skedaddles wrote:We're having a similar problem on our design. We're getting 140uA in deep sleep on a WROOM-02 module, which is also listed as 10uA in deep sleep. We even see this current when we turn off the enable pin; in that state it is only supposed to be using 5uA. We're concerned that the default pin state in the power-down mode might have them sinking small currents from the our LEDs or some other component on our board (normally our LED pins are active-low outputs and the LEDs are pulled high to 3.3v). Unfortunately, I can't find any solid information about how these pins behave when in deep sleep or chip disabled states.
Did you ever figure out where your current was going?
--Sid
I'm working on the Wi-T kit. I found out that most of the current was sinking on the regulator (almost 3.5mA). I took off the built-in LED and light sensor; then I installed a pin on the capacitor and powered the chip directly by 3.3V. The current went below 100mA.
While in deep sleep mode, the built-in LED was still slightly ON. So there might be some sinking current as you said. I think this can be dealed with by using pull-up resistors.
