Schematic Review Request: ESP32-S3 Mini-1U + SDNand Flash + I2S Microphone for Drone Audio Logger

[real_mon2]

Throwing in my 2 bits...

1) Consider the TI ESDS312 sot23 packaged device to protect the USB lines.

https://www.ti.com/product/ESDS312?utm_ ... CMQAvD_BwE

2) Consider the use of a USB load switch over the diode that is currently in place. This load switch can offer a slow start for protection against in-rush currents on VBUS which are very deadly to semiconductors.

WCH CH213K = Diodes AP2331

https://www.lcsc.com/product-detail/C5456874.html

English documentation:

https://akizukidenshi.com/goodsaffix/CH213.pdf

https://www.diodes.com/part/view/AP2331

3) In addition to the above, we apply series EMI filters onto the USB lines.

Kingcore WCM-1210HS-600T (lots of drop in replacements for this footprint and part but Kingcore is a very high quality mfr of the same product for other OEMs under private label. They are in Taiwan).

https://www.kingcore.com/storage/produc ... %20A05.pdf

We are a long time design house and manufacturer for tier 1 OEMs including Foxconn. The above combination of parts are used on our medical products with very high shipped volumes and zero failures.

Hope this helps.