Board

Raspberry Pi Pico specs, pinout & datasheets

Microcontroller board · Raspberry Pi · Released January 2021

Raspberry Pi’s first microcontroller board: the RP2040 with 2 MB of flash on a $4, breadboard-friendly board.

Photo: Ogidya, CC BY-SA 4.0, via Wikimedia Commons

Chip / SoC: Raspberry Pi RP2040
CPU: 2 × Arm Cortex-M0+
Clock: Up to 133 MHz
RAM: 264 KB SRAM
Flash: 2 MB QSPI
I/O voltage: 3.3 V
Released: January 2021
Status: In production

Specs checked against the cited sources on 1 October 2026 (AI-assisted source check). Spotted a mistake? Use the form at the end of the page.

Specifications

13 specs

Chip / SoC: Raspberry Pi RP2040^[1]
CPU: 2 × Arm Cortex-M0+^[1]
Clock: Up to 133 MHz^[1]
RAM: 264 KB SRAM^[1]
Flash: 2 MB QSPI^[1]
GPIO: 26 multi-function GPIO on two 20-pin edges^[1]
Analog: 3 ADC inputs (12-bit)^[1]
I/O voltage: 3.3 V^[1]
Input voltage: 1.8–5.5 V on VSYS; 5 V via micro-USB^[1]
USB: Micro-USB 1.1 device and host^[1]
Dimensions: 51 × 21 mm^[1]
Launch price: US$4^[4]
Upload limits: 2 MB flash, 264 KB RAM^[5]

Upload limits are what a sketch or firmware may use after the bootloader, as the build tools enforce them, not the chip’s full memory.

Can I still use it?

4 platforms

Arduino framework: Supported^[5]Arduino framework available through PlatformIO.
MicroPython: Supported^[3]
CircuitPython: Supported^[7]
Zephyr RTOS: Supported^[6]

As published by each project, checked weekly. A platform not listed has no published information here, which is not the same as no support.

Datasheets and documents

6 documents

Raspberry Pi Pico datasheetDatasheet
RP2040 datasheetDatasheet
Pico-series documentationGuide
Raspberry Pi Pico design files (KiCad/schematic)Schematic
Raspberry Pi Pico product pageProduct page
Raspberry Pi Pico product pageProduct page

Pinout

40 pins

Raspberry Pi Pico 40-pin edge^[1]

Power
Ground
GPIO
Special
Not connected

Pin table (40 pins)

Pico edge pins (USB at the top)
Pin	Label	Kind	Functions
1	GP0	GPIO	UART0 TX, I2C0 SDA, SPI0 RX
2	GP1	GPIO	UART0 RX, I2C0 SCL, SPI0 CSn
3	GND	Ground
4	GP2	GPIO	I2C1 SDA, SPI0 SCK
5	GP3	GPIO	I2C1 SCL, SPI0 TX
6	GP4	GPIO	UART1 TX, I2C0 SDA, SPI0 RX
7	GP5	GPIO	UART1 RX, I2C0 SCL, SPI0 CSn
8	GND	Ground
9	GP6	GPIO	I2C1 SDA, SPI0 SCK
10	GP7	GPIO	I2C1 SCL, SPI0 TX
11	GP8	GPIO	UART1 TX, I2C0 SDA, SPI1 RX
12	GP9	GPIO	UART1 RX, I2C0 SCL, SPI1 CSn
13	GND	Ground
14	GP10	GPIO	I2C1 SDA, SPI1 SCK
15	GP11	GPIO	I2C1 SCL, SPI1 TX
16	GP12	GPIO	UART0 TX, I2C0 SDA, SPI1 RX
17	GP13	GPIO	UART0 RX, I2C0 SCL, SPI1 CSn
18	GND	Ground
19	GP14	GPIO	I2C1 SDA, SPI1 SCK
20	GP15	GPIO	I2C1 SCL, SPI1 TX
21	GP16	GPIO	UART0 TX, I2C0 SDA, SPI0 RX
22	GP17	GPIO	UART0 RX, I2C0 SCL, SPI0 CSn
23	GND	Ground
24	GP18	GPIO	I2C1 SDA, SPI0 SCK
25	GP19	GPIO	I2C1 SCL, SPI0 TX
26	GP20	GPIO	UART1 TX, I2C0 SDA, SPI0 RX
27	GP21	GPIO	UART1 RX, I2C0 SCL, SPI0 CSn
28	GND	Ground
29	GP22	GPIO	I2C1 SDA, SPI0 SCK
30	RUN	Special	Reset (active low)
31	GP26	GPIO	I2C1 SDA, SPI1 SCK, ADC0
32	GP27	GPIO	I2C1 SCL, SPI1 TX, ADC1
33	AGND	Ground
34	GP28	GPIO	UART0 TX, I2C0 SDA, SPI1 RX, ADC2
35	ADC_VREF	Special	ADC reference
36	3V3(OUT)	Power
37	3V3_EN	Special	3.3 V regulator enable
38	GND	Ground
39	VSYS	Power
40	VBUS	Power

Pin names in firmware (30 pins)

From the firmware’s board definition^[9]
Chip pin	Board names
GPIO0	GP0
GPIO1	GP1
GPIO2	GP2
GPIO3	GP3
GPIO4	GP4
GPIO5	GP5
GPIO6	GP6
GPIO7	GP7
GPIO8	GP8
GPIO9	GP9
GPIO10	GP10
GPIO11	GP11
GPIO12	GP12
GPIO13	GP13
GPIO14	GP14
GPIO15	GP15
GPIO16	GP16
GPIO17	GP17
GPIO18	GP18
GPIO19	GP19
GPIO20	GP20
GPIO21	GP21
GPIO22	GP22
GPIO23	SMPS_MODE, GP23
GPIO24	VBUS_SENSE, GP24
GPIO25	LED, GP25
GPIO26	GP26_A0, GP26, A0
GPIO27	GP27_A1, GP27, A1
GPIO28	GP28_A2, GP28, A2
GPIO29	A3, VOLTAGE_MONITOR

Gotchas

3 known issues

Not 5 V tolerant. GPIO is 3.3 V and the RP2040's absolute maximum on an I/O pin is IOVDD + 0.5 V, so 5 V logic can damage it; use a level shifter.^[2]
ADC accuracy limits. The RP2040 ADC's differential non-linearity peaks at four codes (512, 1536, 2560 and 3584), erratum RP2040-E11, which is not fixed, and its reference comes from the noisy 3.3 V supply. For better accuracy, fit an external reference on ADC_VREF or use an external ADC.^[2]
GP25 is the LED. On the Pico the on-board LED is GPIO25. The Pico W drives its LED from the wireless chip instead, so LED code is not interchangeable between them.^[1]

What changed

From the specs

Next came the Raspberry Pi Pico W

Spec	Raspberry Pi Pico	Raspberry Pi Pico W
Analog	3 ADC inputs (12-bit)	—
Wireless	—	2.4 GHz 802.11n Wi-Fi; Bluetooth 5.2 (Infineon CYW43439)
Dimensions	51 × 21 mm	—
Launch price	US$4	US$6

Power and battery

2 facts

VSYS input range: 1.8–5.5 V^[1]
USB input: 5 V on VBUS^[1]

An on-board buck-boost converter makes 3.3 V from VSYS, so a single Li-ion cell or three AA cells in series can power it directly.

Size and mechanical

2 facts

Board size: 51 × 21 mm^[1]
Edge: Castellated pads, 2.54 mm pitch^[1]

History and use today

Editorial

History

Launched in January 2021 at $4, the Pico debuted the RP2040, the first chip designed in-house by Raspberry Pi, with programmable I/O (PIO) state machines that implement interfaces in hardware.^[4]

Still useful for

A cheap, well-documented choice for real-time I/O, USB devices and MicroPython teaching. Use the Pico W or Pico 2 W when you need wireless.

Projects from the archive

6 builds

Sources

9 sources

Raspberry Pi Pico datasheet
RP2040 datasheet
Pico-series microcontrollers, Raspberry Pi documentation
Meet Raspberry Silicon: Raspberry Pi Pico now on sale at $4, Raspberry Pi news
PlatformIO board definition (pico) at 6fc5dce8ef
Zephyr board definition (rpi_pico) at 3c61a12bdd
CircuitPython board definition (raspberry_pi_pico) at 83b54473a1
MicroPython board definition (RPI_PICO) at 19e685eca9
CircuitPython pin definitions (raspberry_pi_pico) at 395b187017

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