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Raspberry Pi Pico 2 pinout

The second-generation Pico with the faster RP2350 chip, twice the memory and 4 MB flash. Same 40-pin layout as the Pico, 3.3 V logic.

Raspberry Pi Pico 2 pinoutRP2350AGP0UART0_TXGP1UART0_RXGNDGNDGP2UART0_CTSGP3UART0_RTSGP4I2C_SDAGP5I2C_SCLGNDGNDGP6UART1_CTSGP7UART1_RTSGP8UART1_TXGP9UART1_RXGNDGNDGP10UART1_CTSGP11UART1_RTSGP12UART0_TXGP13UART0_RXGNDGNDGP14UART0_CTSGP15UART0_RTSGP16SPI_MISOGP17SPI_CSGNDGNDGP18SPI_SCKGP19SPI_MOSIGP20UART1_TXGP21UART1_RXGNDGNDGP22UART1_CTSRUNRESETGP26ADC0GP27ADC1AGNDGNDGP28ADC2ADC_VREFADC_VREF3V3(OUT)3V3_OUT3V3_EN3V3_ENGNDGNDVSYSVSYSVBUSVBUSSWCLKSWD_CLKGNDGNDSWDIOSWD_IO
Top view, USB connector on the left. Colors: red power, grey ground, green GPIO, yellow analog, orange USB serial, blue I2C.
BoardPilot showing the Raspberry Pi Pico 2 in 3D
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At a glance

Chip
RP2350 (RP2350A)
Processor
Dual-core Arm Cortex-M33 or RISC-V Hazard3 at 150 MHz, 520 KB SRAM, 4 MB flash
Logic level
3.3 V. Not 5 V tolerant unless marked below.
Flashing tool
picotool (UF2)
Arduino board (FQBN)
rp2040:rp2040:rpipico2
Live pin view in BoardPilot
Yes (diagnostic agent available)

Pins to avoid or use with care

Debug port: SWCLK, SWDIO

SWD/JTAG. Using them can stop a debugger from reaching the chip.

Good pins for LEDs, buttons and signals

GP15, GP14, GP13, GP12, GP11, GP10, GP22, GP21, GP20, GP6, GP7, GP2, GP3

Default pins in Arduino

I2C
SDA = GP4, SCL = GP5. Only these pins work with the Wire library defaults. Only certain pin pairs can be I2C on this chip, and SDA and SCL cannot be swapped in software. Wire uses GP4 (SDA) and GP5 (SCL); Wire.setSDA()/Wire.setSCL() before Wire.begin() can move I2C0 to GP0/GP1, GP8/GP9, GP12/GP13, GP16/GP17 or GP20/GP21. Wire1 defaults to GP26/GP27.
SPI
MOSI = GP19, MISO = GP16, SCK = GP18, CS = GP17.
Analog inputs
GP26, GP27, GP28 (0–3.3 V)
5 V tolerant pins
GP0, GP1, GP2, GP3, GP4, GP5, GP6, GP7, GP8, GP9, GP10, GP11, GP12, GP13, GP14, GP15, GP16, GP17, GP18, GP19, GP20, GP21, GP22

How to flash it

If the board is not found, hold the BOOTSEL button while plugging in the USB cable.

All 43 pins

PinGPIOChip pinFunctionsNotes
GP00GPIO, UART0_TX, SPI0_MISO, I2C0_SDA, PWM0_A, Serial1_TXTolerates 5 V inputs, but only while the board is powered.
GP11GPIO, UART0_RX, SPI0_CS, I2C0_SCL, PWM0_B, Serial1_RXTolerates 5 V inputs, but only while the board is powered.
GND—GND
GP22GPIO, UART0_CTS, SPI0_SCK, I2C1_SDA, PWM1_ATolerates 5 V inputs, but only while the board is powered.
GP33GPIO, UART0_RTS, SPI0_MOSI, I2C1_SCL, PWM1_BTolerates 5 V inputs, but only while the board is powered.
GP44GPIO, I2C_SDA (default), UART1_TX, SPI0_MISO, I2C0_SDA, PWM2_ATolerates 5 V inputs, but only while the board is powered.
GP55GPIO, I2C_SCL (default), UART1_RX, SPI0_CS, I2C0_SCL, PWM2_BTolerates 5 V inputs, but only while the board is powered.
GND—GND
GP66GPIO, UART1_CTS, SPI0_SCK, I2C1_SDA, PWM3_ATolerates 5 V inputs, but only while the board is powered.
GP77GPIO, UART1_RTS, SPI0_MOSI, I2C1_SCL, PWM3_BTolerates 5 V inputs, but only while the board is powered.
GP88GPIO, UART1_TX, SPI1_MISO, I2C0_SDA, PWM4_A, Serial2_TXTolerates 5 V inputs, but only while the board is powered.
GP99GPIO, UART1_RX, SPI1_CS, I2C0_SCL, PWM4_B, Serial2_RXTolerates 5 V inputs, but only while the board is powered.
GND—GND
GP1010GPIO, UART1_CTS, SPI1_SCK, I2C1_SDA, PWM5_ATolerates 5 V inputs, but only while the board is powered.
GP1111GPIO, UART1_RTS, SPI1_MOSI, I2C1_SCL, PWM5_BTolerates 5 V inputs, but only while the board is powered.
GP1212GPIO, UART0_TX, SPI1_MISO, I2C0_SDA, PWM6_ATolerates 5 V inputs, but only while the board is powered.
GP1313GPIO, UART0_RX, SPI1_CS, I2C0_SCL, PWM6_BTolerates 5 V inputs, but only while the board is powered.
GND—GND
GP1414GPIO, UART0_CTS, SPI1_SCK, I2C1_SDA, PWM7_ATolerates 5 V inputs, but only while the board is powered.
GP1515GPIO, UART0_RTS, SPI1_MOSI, I2C1_SCL, PWM7_BTolerates 5 V inputs, but only while the board is powered.
GP1616GPIO, SPI_MISO (default), UART0_TX, SPI0_MISO, I2C0_SDA, PWM0_ATolerates 5 V inputs, but only while the board is powered.
GP1717GPIO, SPI_CS (default), UART0_RX, SPI0_CS, I2C0_SCL, PWM0_BTolerates 5 V inputs, but only while the board is powered.
GND—GND
GP1818GPIO, SPI_SCK (default), UART0_CTS, SPI0_SCK, I2C1_SDA, PWM1_ATolerates 5 V inputs, but only while the board is powered.
GP1919GPIO, SPI_MOSI (default), UART0_RTS, SPI0_MOSI, I2C1_SCL, PWM1_BTolerates 5 V inputs, but only while the board is powered.
GP2020GPIO, UART1_TX, SPI0_MISO, I2C0_SDA, PWM2_ATolerates 5 V inputs, but only while the board is powered.
GP2121GPIO, UART1_RX, SPI0_CS, I2C0_SCL, PWM2_BTolerates 5 V inputs, but only while the board is powered.
GND—GND
GP2222GPIO, UART1_CTS, SPI0_SCK, I2C1_SDA, PWM3_ATolerates 5 V inputs, but only while the board is powered.
RUN—RESETReset pin. Connect it to GND for a moment to restart the board. It has an internal pull-up.
GP2626GPIO, ADC0, UART1_CTS, SPI1_SCK, I2C1_SDA, PWM5_A, Wire1_SDAAnalog input ADC0 (0 to 3.3 V). Never put more than 3.3 V on this pin.
GP2727GPIO, ADC1, UART1_RTS, SPI1_MOSI, I2C1_SCL, PWM5_B, Wire1_SCLAnalog input ADC1 (0 to 3.3 V). Never put more than 3.3 V on this pin.
AGND—GND, ADC_GNDAnalog ground for GP26 to GP28. Use it as the ground for analog sensors.
GP2828GPIO, ADC2, UART0_TX, SPI1_MISO, I2C0_SDA, PWM6_AAnalog input ADC2 (0 to 3.3 V). Never put more than 3.3 V on this pin.
ADC_VREF—ADC_VREFReference voltage for the analog inputs (filtered 3.3 V). Do not power parts from it.
3V3(OUT)—3V3_OUT3.3 V output for sensors and modules. Keep the load under 300 mA.
3V3_EN—3V3_ENTurns the 3.3 V supply on or off. Leave it unconnected; connecting it to GND switches the board off.
GND—GND
VSYS—VSYSMain power input (1.8 to 5.5 V). From USB it is about 4.7 V (5 V minus a diode drop).
VBUS—VBUS5 V straight from the USB cable. It is 0 V when USB is not plugged in.
SWCLK—SWD_CLKDebug clock for a debug probe (SWD). Not a GPIO.
GND—GNDGround pin of the 3-pin debug header.
SWDIO—SWD_IODebug data for a debug probe (SWD). Not a GPIO.

Questions

Which pins are I2C on the Raspberry Pi Pico 2?

SDA is GP4 and SCL is GP5 (the defaults of the Arduino Wire library). Only certain pins support I2C in hardware, so use these unless you know your core allows others.

Which Raspberry Pi Pico 2 pins should I avoid?

SWCLK, SWDIO (debug port).

Is the Raspberry Pi Pico 2 5 V tolerant?

The chip runs at 3.3 V, but these pins tolerate 5 V inputs: GP0, GP1, GP2, GP3, GP4, GP5, GP6, GP7, GP8, GP9, GP10, GP11, GP12, GP13, GP14, GP15, GP16, GP17, GP18, GP19, GP20, GP21, GP22. The others take at most 3.3 V.

Which pins can read analog voltage on the Raspberry Pi Pico 2?

GP26, GP27, GP28, from 0 to 3.3 V.

How do I upload code to the Raspberry Pi Pico 2?

In the Arduino IDE pick the board rp2040:rp2040:rpipico2 (core rp2040:rp2040). If the board is not found, hold the BOOTSEL button while plugging in the USB cable.

Wiring guides for the Raspberry Pi Pico 2

Step-by-step wiring, voltage checks and test code for the most used parts:

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Compare

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Learn the basics

Lesson: What is a microcontroller? Lesson: Hardware basics for software developers Lesson: GPIO: pins in and out Pinout GPIO Logic level (HIGH and LOW) UF2 Bootloader

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