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usb-to-uart's Introduction

USB-C UART Converter based on CH330

3D Render of the board

CH330 is crystal-less, <$0.35 USB UART converter in a SOIC-8 package. The CH330N enumerates as CH340 or CH341 and its transfer speed goes up to ~2Mb/s.

Initially based on Jan Henrik's prototype board

Schematics

Schematics

BOM

Reference Value Mfr. Part Price
U1 CH330N CH330N US$ 0.5518
C2, C2 100n CC0603KRX7R9BB104 US$ 0.175 for 50
D1, D2 LED 19-217/R6C-AL1M2VY/3T US$ 0.282 for 20
R1, R2 220 0603WAF2200T5E US$ 0.12 for 100
R3, R4 5.1k 0603WAJ0512T5E US$ 0.12 for 100
P1 USB_C_Plug_USB2.0 U262-161N-4BVC11 US$ 0.32
J2
PCB US$ 20 for 5 with shipping

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