FT230X USB-to-UART bridge pinout

FT230X is a Full Speed USB UART bridge with RTS/CTS and four configurable CBUS leads. FT230XS and FT230XQ have different pin numbers.

SSOP-16 16 contacts

QFN-16

17 contacts Current package

FTDI · FT230XQ with ground pad

QFN-16 pinout

QFN-16

Top view. Match pin 1 to the package mark. The numbers advance counterclockwise. Scroll the map to reach all contacts.

Selected pin details

EP · EP

Return · Ground

Exposed underside paddle. Solder to the PCB ground pad.

FTDI FT_000566, version 1.7, §3.1.1

Electrical limits · Link to this pin

All 17 pins

Pin	Signal	Direction	Function
1	VCCIO Supply input	Supply input	Sets the UART and configurable pin logic levels.
2	RXD Input	Input	Asynchronous receive. Connect to the transmitter of the external logic-level UART.
3	GND Return	Return	Connect to the circuit ground plane.
4	CTS# Input	Input	Clear to Send, active low.
5	CBUS2 Configurable	Configurable	Configure this signal in the device’s MTP memory. See the CBUS signal options for available functions.
6	USBDP Bidirectional	Bidirectional	USB D+ line. Route with the other data line as a differential pair and use the manufacturer’s reference circuit.
7	USBDM Bidirectional	Bidirectional	USB D− line. Route with the other data line as a differential pair and use the manufacturer’s reference circuit.
8	3V3OUT Regulator output	Regulator output	Nominal 3.3 V regulator output. Bypass to ground with 100 nF.
9	RESET# Input	Input	Active-low reset. The internal power-on reset handles a normal bus-powered start.
10	VCC Supply input	Supply input	Main supply input. Connect to the specified operating rail and decouple locally.
11	CBUS1 Configurable	Configurable	Configure this signal in the device’s MTP memory. See the CBUS signal options for available functions.
12	CBUS0 Configurable	Configurable	Configure this signal in the device’s MTP memory. See the CBUS signal options for available functions.
13	GND Return	Return	Connect to the circuit ground plane.
14	CBUS3 Configurable	Configurable	Configure this signal in the device’s MTP memory. See the CBUS signal options for available functions.
15	TXD Output	Output	Asynchronous transmit. Connect to the receiver of the external logic-level UART.
16	RTS# Output	Output	Request to Send, active low.
EP	EP Return	Return	Exposed underside paddle. Solder to the PCB ground pad.

Signal assignments

USB data pair

Keep the D+ and D− polarity consistent at the connector and the bridge. Use the package-specific application circuit for matching and bypass components.

Asynchronous UART

Use the receive and transmit pair with a common ground. The signals use logic-level voltages. A separate transceiver is needed for bipolar RS-232.

Electrical limits

Parameter	Limit	Conditions and source
VCC3.3–5.25 V	3.3–5.25 V	The companion uses the USB 5 V bus-powered configuration. FTDI FT_000566, version 1.7, §6
VCCIO1.8–3.3 V nominal	1.8–3.3 V nominal	Sets the I/O voltage. Use the internal 3.3 V regulator for the 3.3 V bench configuration. FTDI FT_000566, version 1.7, §3
UART maximum3 Mbit/s	3 Mbit/s	Use a rate supported by both endpoints. FTDI FT_000566, version 1.7, §1

Models and documents

The interactive maps cover FT230XS in SSOP-16 and FT230XQ in QFN-16. Match the suffix and pad arrangement before placing the device.

FT230XQ: FT230XQ with ground pad

FTDI FT230X datasheet· FT_000566 v1.7, §3 pin assignments and Fig. 6.1 bus-powered example.