Brownout Detection error LiPo powered ESP-32 WROOM PCB

[Mojies]

Hi all,

For a project I created a custom PCB.

It's a LiPo powered PCB with ESP32-WROOM-32E module, Lipo charging module, 3.3V Voltage regulator and MPU6050 Acc/Gyro unit. Charging via USB-C connector. The ESP-32 module being programmed by using a programming header (and external FTDI232 module, to be attached on position “H1:program” in the schematic below.)

After uploading the code and powering via the FTDI232 module, attached to my USB port in computer (LiPo and USB-C disconnected) everything runs fine.

But when trying to power only from LiPo (2000mah) and even when supported with charging power from USB the script is triggering a Brownout Detector error. When uploading a blink or ‘bare minimum’ script everything is working fine om LiPo-only power. My assumption is that the final script (using Wifi, BLE, MPU sensor) is triggering the error while consuming to much current? But I don’t understand why I don’t have this issue when powering via FTDI232 module.

Is my schematic correct (looking at the choice of voltage regulator HT7333-7, placing of capacitors etc)? Any suggestions how I could further investigate and solve the error in a future design are really welcome.

Thanks,

Mojies

[srnet]

@Mojies

My assumption is that the final script (using Wifi, BLE, MPU sensor) is triggering the error while consuming to much current?

Not surprised by that, the HT7333 is only 250mA output.

The ESP32 is well known for drawing a short high current spike when the WiFi turns on. You need a circa 500mA regulator, the HT7833 for instance.

Did you breadboard the circuit with the HT7333 ?