WCH
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USB to UART bridge — the chip on most inexpensive Arduino clones and USB-TTL cables.
| Part number | CH340G |
|---|---|
| Manufacturer | WCH |
| Category | Integrated Circuits › USB & UART Bridge ICs |
| Package | SOIC-16 |
| Pins | 16 |
CH340G pinout
| Pin | Name | Type | Description |
|---|---|---|---|
| 1 | GND | ground | Ground |
| 2 | TXD | output | UART transmit |
| 3 | RXD | input | UART receive |
| 4 | V3 | power | 3.3V regulator pin — 100nF to ground at 5V operation |
| 5 | UD+ | bidirectional | USB D+ |
| 6 | UD- | bidirectional | USB D- |
| 7 | XI | clock | Crystal in |
| 8 | XO | clock | Crystal out |
| 9 | GND | ground | Ground |
| 10 | CTS | input | Clear to send |
| 11 | DSR | input | Data set ready |
| 12 | RI | input | Ring indicator |
| 13 | DCD | input | Carrier detect |
| 14 | DTR | output | Data terminal ready |
| 15 | RTS | output | Request to send |
| 16 | VCC | power | Supply, 5V |
Schematic symbol and footprint
Schematic symbol
Footprint: SOIC-16 — to scale, pad 1 in yellow (mm). Check against the datasheet before ordering PCBs.