![Image 1 — [Review Request] Sequel to ESP32 DRV8833 PCB](https://preview.redd.it/lxjbb7l6ivah1.png?width=681&format=png&auto=webp&s=69fb1a0872f63a7cbce0cae1be1d5f7b20954318)
![Image 2 — [Review Request] Sequel to ESP32 DRV8833 PCB](https://preview.redd.it/22uki7l6ivah1.png?width=724&format=png&auto=webp&s=1e9ce3596a7aea59a9e7319cdda7f53efa893cf1)
![Image 3 — [Review Request] Sequel to ESP32 DRV8833 PCB](https://preview.redd.it/d0ywz7l6ivah1.png?width=694&format=png&auto=webp&s=6ff9267d6668927c31ae6427b66ac2b28d04bab0)
![Image 4 — [Review Request] Sequel to ESP32 DRV8833 PCB](https://preview.redd.it/v6qms2bhivah1.png?width=1285&format=png&auto=webp&s=b9998f977c74528ba9753390cb104716343c8168)
![Image 5 — [Review Request] Sequel to ESP32 DRV8833 PCB](https://preview.redd.it/84zlz2bhivah1.png?width=1135&format=png&auto=webp&s=9eaed0ed2deb522c7df5621cec9e446a4dbac990)
I've made some revisions to my last version:
- Added pfet to the battery port for RPP
- Switched my SBR2A40P1-7 for the LM66100DCKT ideal diode
- Added a TPS22918 for inrush current control to keep bypass the 10uF limit on USB VBUS line
I just wanted some feedback on the added features to see if I wired them correctly. I still haven't tested using the correct USBC port, but will ASAP
This is a design for a battery powered ESP32 controlled DRV8833 car. Forgot to include in the pictures, but I am using a 103450 battery.
My main questions are:
- Will my 3V3 configuration work for the CH340C
- Is the soft start/load switching circuit functional
Every time I leave my laptop unplugged and unattended for more than 30 minutes, it seems to just freeze without explanation. Pressing the power button for a second does nothing, and the caps lock light doesn't change when I press it. Every time I need to hard shut down my laptop before it will work again.
Sometimes when I try to change the brightness (Fn + up/down arrow), the brightness bar will appear, but the level wouldn't change, and it seems like a precursor sign to my laptop freezing.
My BIOS is up to date, and my laptop passed all the quick scan tests.
This is an ESP32 board designed to control two 300mA stall current motors via DRV8833. It has a load switching circuit with a battery. It also has exposed I2C and SPI pins for when I want to add additional header boards.
I already got my board made and soldered the components myself, although I definitely should have tried getting feedback first.
Here's the list of things that happened in the process of testing (battery disconnected for the entire process):
- Tested for any shorts between adjacent pins with a multimeter (no issues)
- Tested for continuity between IC pins and where they should connect on another component to make sure solder joints were ok
- Plugged the PCB into my computer via USBA cable
- Found the voltage on the 5V rail read ~1.4V (multimeter found no shorts on the voltage rails)
- I thought the issue could be with the USBC 10uF max capacitance, so I removed the 47uF bulk caps on the DRV8833 and the 22uF cap next to the LDO (didn't fix)
- Removed D3 (part of the load switching circuit) and the TVS diode for the USBC port (didn't fix)
- Finally re-did the joints on the connector, and it worked :D, but when I reconnected D3 the voltage at the EN pin of the LDO only read 1.6V (turns out I broke one of the diode pins while desoldering it)
- I shorted D3 with a wire, then my CH340C gets hella hot, immediately unplugged. I replaced it with a fresh chip, thinking that previous work fried it, but it got immediately fried again.
A few things that I should probably fix:
- Decoupling cap for the CH340C is placed next to the wrong pin
- Change the CH340C to 5V configuration (?)
Thank you for reading this far, I really don't want to spend more money on components, so I would appreciate any help I could get.