Raspberry Pi Pico RP2040 Microcontroller Board – Pinout Diagram & Arduino Pin Reference

Raspberry Pi Pico is a small form-factor development board and PCB module based on the RP2040 dual-core microcontroller from the Raspberry Pi Foundation, UK. On this page, you will find the pinout diagrams and references for the Raspberry Pi Pico board. If you want to learn more about the board, we have a getting started tutorial that you can find below.

Pinout Diagram

Raspberry Pi has a pinout diagram for the Pico board here. But we thought we could a better job at designing one ourselves that also includes the Arduino pins. You are free to download, modify and redistribute the design under Creative Commons Attribution 4.0 International License. This pinout is also applicable for other board variants such as Raspberry Pi Pico H, W, and the WIZnet WizFi360 Pico.

Latest Revision: r0.3, 06-12-2022
Design by: Vishnu Mohanan
License: CC-BY-SA 4.0

Pinouts are based on the latest documentation from Raspberry Pi. While we try our best to be accurate and up-to-date here, we can not guarantee correctness. Please also double-check the pin assignments with that from the official documentation. If you found any errors here, please let us know in the comments. We will update our designs ASAP.

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Old Versions

1. Version 0.1 – Raspberry-Pi-Pico-Pinout-r0.1-CIRCUITSTATE-Electronics.pdf
2. Version 0.2 – Raspberry-Pi-Pico-Pinout-r0.2-CIRCUITSTATE-Electronics.pdf

RP2040 Pinout

Pinout Reference

Power & Control

Here is a list of pins used to supply power, clock, and other control signals. Pins with similar names are internally connected together and it is also recommended to the connections externally when designing a PCB.

Name	Pins	Description
IOVDD	1, 10, 22, 33, 42, 49	Power supply for digital GPIOs, nominal voltage 1.8V to 3.3V
DVDD	23, 50	Digital core power supply, nominal voltage 1.1V. Can be connected to VREG_VOUT, or to some other board-level power supply.
ADC_AVDD	43	Power supply for analogue-to-digital converter, nominal voltage 3.3V
USB_VDD	48	Power supply for internal USB Full Speed PHY, nominal voltage 3.3V
VREG_VIN	44	Power input for the internal core voltage regulator, nominal voltage 1.8V to 3.3V
VREG_VOUT	45	Power output for the internal core voltage regulator, nominal voltage 1.1V, 100mA max current
GND	Exposed Pad (EP)	Single external ground connection, bonded to a number of internal ground pads on the RP2040 die.
RUN	26	Global asynchronous reset pin. Reset when driven low, run when driven high. If no external reset is required, this pin can be tied directly to IOVDD.
TESTEN	19	Factory test mode pin. Tie to GND.
XIN and XOUT	20, 21	Connect a crystal to RP2040’s crystal oscillator. XIN can also be used as a single-ended CMOS clock input, with XOUT disconnected. The USB bootloader requires a 12MHz crystal or 12MHz clock input.

Memory

These pins are used to interface an external flash memory since RP2040 does not have an internal flash capacity. A Quad SPI (SPI with four data lines) interface is used for the flash interface. The QSPI pins can also be used as GPIOs if not used to interface a flash.

Name	Pins	Description
QSPI_SD3	51	Serial Data 3
QSPI_SCLK	52	Serial Clock
QSPI_SD0	53	Serial Data 0
QSPI_SD2	54	Serial Data 2
QSPI_SD1	55	Serial Data 1
QSPI_SS_N	56	SPI Chip Select

SWD

Serial Wire Debug (SWD) is the interface used to program and debug the RP2040 microcontroller. Only three pins (including GND) are required for this interface and they can not be used for anything else.

Name	Pins	Description
SWCLK	24	SWD Clock
SWDIO	25	SWD Data In and Out

USB

RP2040 contains a single USB 2.0 controller that can act as both host and peripheral. But the speeds are limited to Low-Speed (1.5 Mbps) and Full-Speed (12 Mbps) due to the usage of a USB 1.1 PHY (Physical Layer). When wiring up a USB connector, you need at least four lines; DP, DM, VBUS, and GND. VBUS is a +5V supply sourced by an external host when RP2040 is in peripheral mode. You can use it to power the microcontroller. In USB host mode, you must use the VBUS to supply +5V to the connected device.

The USB data lines can not be used for anything else and should be left floating if not used.

Name	Pins	Description
USB_DP	47	USB Data Positive (D+)
USB_DM	46	USB Data Negative (D-)

GPIO Function Matrix

The RP2040 has 30 General Purpose Input/Output (GPIO) pins; an odd number indeed. This set of pins is referred to as Bank 0 in the datasheet. Maybe we will get an additional Bank 1 with a newer version of RP2040. GPIO pins also have special functions other than digital input and output which are listed below.

GPIO	F1	F2	F3	F4	F5	F6	F7	F8	F9
0	SPI0 RX	UART0 TX	I2C0 SDA	PWM0 A	SIO	PIO0	PIO1		USB OVCUR DET
1	SPI0 CSn	UART0 RX	I2C0 SCL	PWM0 B	SIO	PIO0	PIO1		USB VBUS DET
2	SPI0 SCK	UART0 CTS	I2C1 SDA	PWM1 A	SIO	PIO0	PIO1		USB VBUS EN
3	SPI0 TX	UART0 RTS	I2C1 SCL	PWM1 B	SIO	PIO0	PIO1		USB OVCUR DET
4	SPI0 RX	UART1 TX	I2C0 SDA	PWM2 A	SIO	PIO0	PIO1		USB VBUS DET
5	SPI0 CSn	UART1 RX	I2C0 SCL	PWM2 B	SIO	PIO0	PIO1		USB VBUS EN
6	SPI0 SCK	UART1 CTS	I2C1 SDA	PWM3 A	SIO	PIO0	PIO1		USB OVCUR DET
7	SPI0 TX	UART1 RTS	I2C1 SCL	PWM3 B	SIO	PIO0	PIO1		USB VBUS DET
8	SPI1 RX	UART1 TX	I2C0 SDA	PWM4 A	SIO	PIO0	PIO1		USB VBUS EN
9	SPI1 CSn	UART1 RX	I2C0 SCL	PWM4 B	SIO	PIO0	PIO1		USB OVCUR DET
10	SPI1 SCK	UART1 CTS	I2C1 SDA	PWM5 A	SIO	PIO0	PIO1		USB VBUS DET
11	SPI1 TX	UART1 RTS	I2C1 SCL	PWM5 B	SIO	PIO0	PIO1		USB VBUS EN
12	SPI1 RX	UART0 TX	I2C0 SDA	PWM6 A	SIO	PIO0	PIO1		USB OVCUR DET
13	SPI1 CSn	UART0 RX	I2C0 SCL	PWM6 B	SIO	PIO0	PIO1		USB VBUS DET
14	SPI1 SCK	UART0 CTS	I2C1 SDA	PWM7 A	SIO	PIO0	PIO1		USB VBUS EN
15	SPI1 TX	UART0 RTS	I2C1 SCL	PWM7 B	SIO	PIO0	PIO1		USB OVCUR DET
16	SPI0 RX	UART0 TX	I2C0 SDA	PWM0 A	SIO	PIO0	PIO1		USB VBUS DET
17	SPI0 CSn	UART0 RX	I2C0 SCL	PWM0 B	SIO	PIO0	PIO1		USB VBUS EN
18	SPI0 SCK	UART0 CTS	I2C1 SDA	PWM1 A	SIO	PIO0	PIO1		USB OVCUR DET
19	SPI0 TX	UART0 RTS	I2C1 SCL	PWM1 B	SIO	PIO0	PIO1		USB VBUS DET
20	SPI0 RX	UART1 TX	I2C0 SDA	PWM2 A	SIO	PIO0	PIO1	CLOCK GPIN0	USB VBUS EN
21	SPI0 CSn	UART1 RX	I2C0 SCL	PWM2 B	SIO	PIO0	PIO1	CLOCK GPOUT0	USB OVCUR DET
22	SPI0 SCK	UART1 CTS	I2C1 SDA	PWM3 A	SIO	PIO0	PIO1	CLOCK GPIN1	USB VBUS DET
23	SPI0 TX	UART1 RTS	I2C1 SCL	PWM3 B	SIO	PIO0	PIO1	CLOCK GPOUT1	USB VBUS EN
24	SPI1 RX	UART1 TX	12C0 SDA	PWM4 A	SIO	PIO0	PIO1	CLOCK GPOUT2	USB OVCUR DET
25	SPI1 CSn	UART1 RX	I2C0 SCL	PWM4 B	SIO	PIO0	PIO1	CLOCK GPOUT3	USB VBUS DET
26	SPI1 SCK	UART1 CTS	I2C1 SDA	PWM5 A	SIO	PIO0	PIO1		USB VBUS EN
27	SPI1 TX	UART1 RTS	I2C1 SCL	PWM5 B	SIO	PIO0	PIO1		USB OVCUR DET
28	SPI1 RX	UART0 TX	I2C0 SDA	PWM6 A	SIO	PIO0	PIO1		USB VBUS DET
29	SPI1 CSn	UART0 RX	I2C0 SCL	PWM6 B	SIO	PIOO	PIO1		USB VBUS EN

Function Name	Description
SPIx	Connect one of the internal PL022 SPI peripherals to GPIO
UARTx	Connect one of the internal PL011 UART peripherals to GPIO
I2Cx	Connect one of the internal DW I2C peripherals to GPIO
PWMx A/B	Connect a PWM slice to GPIO. There are eight PWM slices, each with two output channels (A/B). The B pin can also be used as an input, for frequency and duty cycle measurement.
SIO	Software control of GPIO, from the single-cycle IO (SIO) block. The SIO function (F5) must be selected for the processors to drive a GPIO, but the input is always connected, so software can check the state of GPIOs at any time.
PIOx	Connect one of the programmable IO blocks (PIO) to GPIO. PIO can implement a wide variety of interfaces, and has its own internal pin mapping hardware, allowing flexible placement of digital interfaces on bank 0 GPIOs. The PIO function (F6, F7) must be selected for PIO to drive a GPIO, but the input is always connected, so the PIOs can always see the state of all pins.
CLOCK GPINx	General purpose clock inputs. Can be routed to a number of internal clock domains on RP2040, e.g. to provide a 1Hz clock for the RTC, or can be connected to an internal frequency counter.
CLOCK GPOUTx	General purpose clock outputs. Can drive a number of internal clocks (including PLL outputs) onto GPIOs, with optional integer divide.
USB OVCUR DET, VBUS DET, VBUS EN	USB power control signals to/from the internal USB controller

Arduino-Pico

Here we have a list of pins that you can use in your Arduino sketches if you are using the Arduino-Pico core from @earlephilhower. These references are taken from the pins_arduino.h file.

GPIO

The 30 GPIO pins can be referenced from 0 to 29 in your Arduino sketch. But among the 30 pins, only 26 are broken out on the official Pico boards. A few of the pins are used for different control and measurement tasks. You can also reference the GPIO pins with the D prefix, eg. D21. All GPIO pins have pull-up and pull-down resistors associated with them which you can enable from the software.

• GP29/ADC3 is used to measure VSYS.
• GP25 is used by the debug LED.
• GP24 is used for VBUS sense.
• GP23 is connected to the SMPS Power Save pin.

LED

The onboard LED is connected to GPIO25.

UART

RP2040 has two dedicated UART ports (UART0 and UART1) with flow control pins. Functions of both UART instances can be assigned to multiple pins which are listed below. Additionally, the USB port can be enumerated as USB-CDC serial port which is the default Serial of Raspberry Pi Pico boards. The hardware UARTs can be invoked as Serial1 (UART0) and Serial2 (UART1). There are default pins assignments for both UARTs. But these pin assignments can be changed to other valid pins using setRX() and setTX() functions as described here. The alternative pins are given inside the brackets.

Additionally, you can use the PIO blocks to implement additional UARTs.

Arduino Instance	RX	TX	RTS	CTS
Serial1 (UART0)	1 (13, 17, 29)	0 (12, 16, 28)	3, 15, 19	2, 14, 18
Serial2 (UART1)	9 (5, 21, 25)	8 (4, 20, 24)	7, 11, 23, 27	6, 10, 22, 26

SPI

There are two hardware SPI peripherals inside the RP2040. Similar to the UARTs, we can assign SPI functions to multiple sets of pins. Below is a list of default pins and alternative pins you can use in your Arduino sketches. You can change the pins using setRX(), setTX(), setCTS() and setSCK() functions as described here.

Additionally, you can use the PIO blocks to implement extra SPI interfaces.

Arduino Instance	SCK	COPI	CIPO	CS
SPI (SPI0)	18 (2, 6, 22)	19 (3, 7, 23)	16 (0, 4, 20)	17 (1, 5, 21)
SPI1 (SPI1)	14 (10, 26)	15 (11, 27)	12 (8, 24, 28)	13 (9, 25, 29)

I2C

RP2040 has two I2C (Two Wire Interface) peripherals inside. These interfaces are referenced as Wire (I2C0) and Wire1 (I2C1) in the Arduino sketches. There are default pin assignments as well as alternative pins you can assign with functions setSCL() and setSDA() as explained here.

Arduino Instance	SDA	SCL
Wire (I2C0)	4 (0, 8, 12, 16, 20, 24, 28)	5 (1, 9, 13, 17, 21, 25, 29)
Wire1 (I2C1)	26 (2, 6, 10, 14, 18, 22)	27 (3, 7, 11, 15, 19, 23, 27)

PWM

RP2040’s PWM block has 8 slices. Each slice can drive up to 2 pins. That gives 16 individually controlled PWM pins with 16-bit precision. All GPIO pins can be used for PWM output.

ADC

RP2040 has a single SAR ADC block inside with a maximum sampling rate of 500ksps and 12-bit precision. GPIO pins 26 to 29 can act as ADC inputs. In the Arduino, these pins are references as given below.

Arduino Pin	GPIO
A0	26
A1	27
A2	28
A3	29

External Interrupts

RP2040 supports level (HIGH and LOW) and edge (rising and falling) triggered interrupts on all GPIO pins.

PIO

There are two identical Programmable IO (PIO) blocks inside the RP2040, each block with four state machines. The PIO block can be configured as a variety of hardware peripherals such as SPI, UART, SDIO, I2C, etc. All 30 GPIOs of the RP2040 can be used for PIO functions.

Arduino Mbed

There are two framework implementations for working with RP2040 in an Arduino environment. The Arduino-Pico core is maintained by @earlephilhower, and is based on the official RP2040 C/C++ SDK. Another one is the Arduino-Mbed package based on the open-source Mbed OS for microcontrollers. RP2040 pin assignments are different for both packages. Here we have the RP2040 pin assignments for the Arduino-Mbed.

GPIO

The GPIO pins can be referenced in the same way we did before, starting from 0 to 29.

UART

Only one UART is available in the Arduino-Mbed package for Raspberry Pi Pico, Serial1. The default Serial is the USB-CDC port.

Arduino Instance	RX	TX
Serial1	1	0

SPI

Only one SPI instance is available in the Arduino-Mbed package; SPI.

Arduino Instance	SCK	COPI	CIPO	CS
SPI	18	19	16	17

I2C

Only one I2C instance is available.

Arduino Instance	SDA	SCL
Wire	4	5

ADC

ADC pin assignments are the same for Arduino-Pico and Arduino-Mbed packages for Raspberry Pi Pico.

Arduino Pin	GPIO
A0	26
A1	27
A2	28
A3	29

Links

1. Raspberry Pi Pico Datasheet
2. RP2040 Datasheet
3. Getting Started with Raspberry Pi Pico : RP2040 Microcontroller Board – Pinout, Schematic and Programming Tutorial

Short Link

• Short URL to this page: https://circuitstate.com/rpipicopinout