Logical pinout · physical placement not verified

5V
USB VBUS pass-through (4.0–5.25V from the host USB port). Available on most CP2102 breakouts to power 5V targets.
Type · PowerVoltage · 5
3V3
Regulated 3.3V output from the CP2102 internal LDO. Useful for powering small 3.3V loads (a few tens of mA); not intended to power a full ESP32 module.
Type · PowerVoltage · 3.3
GND
Common ground between the module, the host USB cable, and the target board.
Type · Ground
TXD
UART transmit from the CP2102 to the target MCU. Drives the target's RX. Logic level depends on the module's VIO jumper (typically 3.3V on modern CP2102 breakouts; some legacy boards are 5V).
Type · UART
RXD
UART receive from the target MCU into the CP2102. Connects to the target's TX. CP2102 RXD inputs are 5V tolerant on the chip itself, but logic levels follow the module's selected VIO.
Type · UART
DTR
Data Terminal Ready modem control (driven by the host PC). Most commonly used together with RTS to drive the auto-reset / auto-bootloader sequence on ESP8266, ESP32 and Arduino targets (DTR -> EN/RESET via a transistor pair).
Type · GPIO
RTS
Request To Send modem control (driven by the host PC). Paired with DTR for the ESP8266/ESP32/Arduino auto-bootloader strap (RTS -> GPIO0/IO0 via a transistor pair).
Type · UART

Pin	Type	Function	Voltage
5V	Power	USB VBUS pass-through (4.0–5.25V from the host USB port). Available on most CP2102 breakouts to power 5V targets.	5
3V3	Power	Regulated 3.3V output from the CP2102 internal LDO. Useful for powering small 3.3V loads (a few tens of mA); not intended to power a full ESP32 module.	3.3
GND	Ground	Common ground between the module, the host USB cable, and the target board.
TXD	UART	UART transmit from the CP2102 to the target MCU. Drives the target's RX. Logic level depends on the module's VIO jumper (typically 3.3V on modern CP2102 breakouts; some legacy boards are 5V).
RXD	UART	UART receive from the target MCU into the CP2102. Connects to the target's TX. CP2102 RXD inputs are 5V tolerant on the chip itself, but logic levels follow the module's selected VIO.
DTR	GPIO	Data Terminal Ready modem control (driven by the host PC). Most commonly used together with RTS to drive the auto-reset / auto-bootloader sequence on ESP8266, ESP32 and Arduino targets (DTR -> EN/RESET via a transistor pair).
RTS	UART	Request To Send modem control (driven by the host PC). Paired with DTR for the ESP8266/ESP32/Arduino auto-bootloader strap (RTS -> GPIO0/IO0 via a transistor pair).

Logical pinout · physical placement not verified

Pin details

7 connections

5V
USB VBUS pass-through (4.0–5.25V from the host USB port). Available on most CP2102 breakouts to power 5V targets.
PowerVoltage · 5
3V3
Regulated 3.3V output from the CP2102 internal LDO. Useful for powering small 3.3V loads (a few tens of mA); not intended to power a full ESP32 module.
PowerVoltage · 3.3
GND
Common ground between the module, the host USB cable, and the target board.
Ground
TXD
UART transmit from the CP2102 to the target MCU. Drives the target's RX. Logic level depends on the module's VIO jumper (typically 3.3V on modern CP2102 breakouts; some legacy boards are 5V).
UART
RXD
UART receive from the target MCU into the CP2102. Connects to the target's TX. CP2102 RXD inputs are 5V tolerant on the chip itself, but logic levels follow the module's selected VIO.
UART
DTR
Data Terminal Ready modem control (driven by the host PC). Most commonly used together with RTS to drive the auto-reset / auto-bootloader sequence on ESP8266, ESP32 and Arduino targets (DTR -> EN/RESET via a transistor pair).
GPIO
RTS
Request To Send modem control (driven by the host PC). Paired with DTR for the ESP8266/ESP32/Arduino auto-bootloader strap (RTS -> GPIO0/IO0 via a transistor pair).
UART

Converters

113 other options

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