CP2104

USB UART bridge

The CP2104 is a USB-to-UART bridge controller that supports UART data transfer and includes GPIO functionality for status and control.

In stock

Specifications

Pin	Name	Functions	Notes
6	VDD	POWER	Power Supply Voltage Input.
5	VIO	POWER	I/O Supply Voltage Input.
2	GND	GND	Ground. Must be tied to ground.
9	RST	GPIO	Device Reset. Open-drain output of internal POR or VDD monitor.
7	REGIN	POWER	5 V Regulator Input.
8	VBUS	GPIOPOWER	VBUS Sense Input. Connect to USB network's VBUS signal.
16	VPP	—	Connect a 4.7 µF capacitor between this pin and ground for ROM programming via USB interface.
3	D+	SPIUART	USB D+
4	D-	SPIUART	USB D-
21	TXD	UART	Asynchronous data output (UART Transmit)
20	RXD	UART	Asynchronous data input (UART Receive)
18	CTS	UART	Clear to Send control input (active low)
19	RTS	UART	Ready to Send control output (active low)
22	DSR	UART	Data Set Ready control input (active low)
23	DTR	UART	Data Terminal Ready control output (active low)
24	DCD	UART	Data Carrier Detect control input (active low)
1*	RI	UART	Ring Indicator control input (active low)
17	SUSPEND	SPIUART	This pin is logic high when the CP2104 is in the USB Suspend state.
15	SUSPEND	SPIUART	This pin is logic low when the CP2104 is in the USB Suspend state.
11	GPIO.3	GPIO	User-configurable input or output.
12	GPIO.2	GPIO	User-configurable input or output.
13	GPIO.1	GPIO	User-configurable input or output.
14	GPIO.0	GPIO	User-configurable input or output.
10*	NC	—	This pin should be left unconnected or tied to VIO.

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CP2104

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