USB-to-UART Bridge Chips

USB to UART bridge chips which have been included on ESP32-based development boards are listed below.

FTDI

Future Technology Devices International Ltd.

Drivers:
- Virtual COM Port (VCP) Drivers (Recommended)
- D2XX Direct Drivers (Allows direct access to the USB device through a DLL.)
Guide: How to Install FTDI Drivers
(Uses FT232RL in the example, but the general process of the installation is the same.)

Series

Maximum Bit Rate

Notes

FT230X

3 Mbit/s

Chips:

Identifier	Package	Pins	Clock	Embed. EEPROM	ESP32 Dev. Boards
FT230XQ	QFN16	16+1	Built‑in	Yes	Pesky ESP32 Dev. Board
FT230XS	SSOP-16	16	Built‑in	Yes	(None)

Datasheet

FT231X

3 Mbit/s

Chips:

Identifier	Package	Pins	Clock	Embed. EEPROM	ESP32 Dev. Boards
FT231XQ	QFN20	20+1	Built‑in	Yes	Gravitech/MakerAsia Nano32
FT231XS	SSOP-20	20	Built‑in	Yes	Ayarafun/LamLoei Node32S, EzSBC ESP32 Dev. Board, Magic Cauldron ESP-WROOM-32 Breakout, Makestro/DycodeX ESPectro32, Microwavemont ESP32 Super Board, Microwavemont ESP32 Monster Board, Microwavemont ESP32 CAN CAN Board, Microwavemont ESP32-ADB (Rev. 1), Microwavemont ESP32-ADB Type R, Microwavemont ESP32 Web Radio & BT Receiver with Class-D Amp, ProtoCentral Kalam32-Dev, Sparkfun ESP32 Thing, Switch Science ESPr Developer 32

Datasheet

FT232R

3 Mbit/s

Chips:

Identifier	Package	Pins	Clock	Embed. EEPROM	ESP32 Dev. Boards
FT232RQ	QFN32	32+1	Built‑in	Yes	Asukiaaa ESP32BB (Rev. 1.0–1.4), dotstudio Nefry BT
FT232RL	SSOP-28	28	Built‑in	Yes	Espressif ESP32 Demo Board V2, Keri's Lab KERISP32

Datasheet

FT2232H

12 Mbit/s

Chips:

Identifier	Package	Pins	Clock	Embed. EEPROM	ESP32 Dev. Boards
FT2232HL	LQFP-64	64	External	No	Espressif ESP-WROVER-KIT, Baoshi JESP32 JTAG
FT2232HQ	QFN64	64+1	External	No	(None)
FT2232H-56Q	VQFN-56	56+1	External	No	(None)

Datasheet

SiLabs

Silicon Laboratories

Drivers:
- CP210x USB to UART Bridge VCP Drivers (Recommended)
- Direct Access Drivers

Series

Maximum Bit Rate

Notes

CP2102

1 Mbit/s

Chip:

Identifier	Package	Pins	Clock	Embed. EEPROM	ESP32 Dev. Boards
CP2102	QFN28	28+1	Built‑in	Yes	Ai-Thinker NodeMCU-32S, AnalogLamb ESP32 Dev. Board, Asukiaaa ESP32BB (Rev 2.0), Asukiaaa ESP32Stack, DOIT ESP32 DevKit, Dongsen Tech D-duino-32, Dongsen Tech Pocket 32, Dongsen Tech X-32, eBox ESP32-T, eBox ESP32-ST, Elecrow ESP32 WIFI/BLE Board, ESP32.vn ESP-IoT-Uno, Espressif ESP32-DevKitC, Explore Embedded Hornbill ESP32 Dev, Freematics ESPRIT, GOOUUU-ESP32, Heltec WIFI Kit 32, Heltec WIFI LoRa 32, Kilobyte ESP32 Tiny Module, Microwavemont ESP32-ADB (Rev. 2), Noduino Quantum, Robotika Brno RB3200-ESP32universal, Spencer/Gratton ESPlant, thingTronics WiTooth, WeMos-fake LoLin OLED, WeMos-fake WiFi&Bluetooth Battery, WeMos-fake X-32, XiaoJ ESP-WROOM-32 Flashing/Testing Fixture, XiaoJ ESP32-Mini-Board

Datasheet
Data sizes of 5 and 6 bits are not supported at baud rates above 921.6 kbit/s. (7 or 8 data bits only.)

CP2104

2 Mbit/s

Chip:

Identifier	Package	Pins	Clock	Embed. EEPROM	ESP32 Dev. Boards
CP2104	QFN24	24+1	Built‑in	Yes	Adafruit HUZZAH32, AnalogLamb Maple ESP32, AprilBrother ESPea32, Electronic Sweet Peas ESP320, GNDTeknik ESP32 Breakout Kit, IntoRobot Fig, MH-ET LIVE ESP32 DevKit, MH-ET LIVE ESP32 MiniKit, WEMOS LoLin32, Widora-Air

Datasheet
Data sizes of 5 and 6 bits are not supported at baud rates above 921.6 kbit/s. (7 or 8 data bits only.)

CP2102N

3 Mbit/s

Chips:

Identifier	Package	Pins	Clock	Embed. EEPROM	ESP32 Dev. Boards
CP2102N-QFN20	QFN20	20+1	Built‑in	Yes	(None)
CP2102N-QFN24	QFN24	24+1	Built‑in	Yes	iohippo ESP32 Dev. Board, Kilobyte ESP32 Breakout, Watterott ESP-WROOM-32-Breakout
CP2102N-QFN28	QFN28	28+1	Built‑in	Yes	(None)

Documentation:
- Datasheet
- CP2101/2/3/4/9 to CP2102N Porting Guide

WCH

WinChipHead / Jiangsu Qinheng Co., Ltd. — previously known as Nanjing Qinheng Electronic Co., Ltd.

Websites:
- Chinese
  Most up-to-date.
- English
  Lagging behind; lacking content.
Drivers:
Don't worry, you're supposed to use the CH341 driver for CH340.
- Windows
- macOS (signed)
  Recommended. Driver for use with OS X 10.9 through macOS 10.12 (Sierra).
- macOS (official)
  See also: CH340 CH341 serial adapters on macOS 10.12 Sierra and Chinese Arduinos with CH340/CH341 Serial/USB Chip on OS X Yosemite.
- Linux
- Android

Series

Maximum Bit Rate

Notes

CH340

2 Mbit/s

Chips:

Identifier	Package	Pins	Clock	Embed. EEPROM	ESP32 Dev. Boards
CH340G	SOP-16	16	External	No	(None)
CH340C	SOP-16	16	Built‑in	No	Geekworm Easy Kit ESP32-B1
CH340B	SOP-16	16	Built‑in	Yes	(None)
CH340E	MSOP-10	10	Built‑in	No	(None)
CH340T	SSOP-20	20	External	No	Olimex ESP32-EVB (Rev. B), Olimex ESP32-Gateway

CH340G, CH340C, CH340B, CH340E, and CH340T are for USB to serial UART. For obvious reasons, chips in the CH340 series used for USB to something else other than serial UART have been excluded. (CH340R is for USB to serial IrDA. CH340H and CH340S are for USB to IEEE-1284 parallel printer interface.) The CH340 SOP-16 chip used in the fake-WeMos D1 R32 board is not positively identified; thus the board is absent from this table.

Product page
Datasheets (PDF):
- CH340 Series USB⇔Serial Datasheet (Chinese)
  Document version 2C; includes information on CH340G, CH340C, CH340B, CH340E, CH340T, and CH340R.
- CH340 Series USB⇔Serial Datasheet (English)
  Document version 1D; includes information on CH340T and CH340R.
- CH340G USB⇔Serial Datasheet (English)
  Document version 1E; translated by DreamCity Innovations.
Hardware design: CH340G in EAGLE EDA