ESP32 Forum

This is on a custom board that I have designed which is probably the issue. I have attached the strapping pin capture from my logic analyzer and a schematic. I have the reset circuitry external to the board but I don't think this makes a difference. In the screen capture, i'm trying to put the ESP into fw download mode but there is no response on the UART

GPIO2 is pulled high.

Does this seem like a power supply issue? Soldering issue to the chip?

When i have the EN line pulled to ground, my PSU says 0.02A on the output. Once it goes back high... 0.01A. Pretty sure this is way too little draw for the chip to be on.

Yeah, that's likely an issue with either the power supply or the EN pin logic. It should pull more current than that when it's active.

ESP_Sprite wrote: ↑

Fri Nov 15, 2024 7:59 am

Yeah, that's likely an issue with either the power supply or the EN pin logic. It should pull more current than that when it's active.

Thanks. Any recommendations for what to look for? I'll probe around and check if the 3v3 inputs are all getting that.

Getting0508 wrote: ↑

Sat Nov 16, 2024 7:47 pm

Thanks. Any recommendations for what to look for? I'll probe around and check if the 3v3 inputs are all getting that.

Do you have multiple boards that all show this issue, or only one? If the latter, suggest you build a few more boards, see if it's not a physical issue.