ESP-S3-WROOM-1 - Download Mode

[Osraldo]

Hey guys,

currently I try to flash an ESP-S3-WROOM-1 (soldered on a plain PCB breakout board).
Unfortunately with limited success...

My wiring looks as follow:

All GNDs -> Battery -
3V3 -> Battery +
EN -> pulled high, with help of a 10kOhm resistor connected to Battery +
IO0 -> pulled low, connected to GND
IO19 -> USB_D-
IO20 -> USB_D+

What I have observed, that the S3 does not even enter download mode nor standard boot mode, while IO0 is pulled down. So in other words: if I pull down IO0 the S3 does not start at all. My osci does not show any consumption then...

Did I forget something?

Any help is greatly appreciated.

Thanks.
Osraldo

[chegewara]

When you connect D+/- your OS should detect new device. Its not important if new device will install proper driver, but new device should be detected. If its not, then you should check wiring.

[ESP_Sprite]

You don't have a power-on-reset circuit. Add an 100n to 1uF capacitor from EN to ground. Also, what voltage is 'battery +'?