Debug (SWD)

BOOTSEL_BUTTON

RP2040

Infineon CYW43439

Wireless/Bluetooth Antenna

 can be used in both Device and Host mode. The Raspberry Pi Pico W exposes it as a USB Micro B port that can be used both to access the USB bootloader (BOOTSEL mode) stored in the 

USB Micro B

The board has a builtin LED that is connected to the 

 module. The LED is accessible via SDK and MicroPython.

General Purpose I/O

Here is the an example code showing how to turn it on or off in MicroPython:

In order to program the Raspberry Pi Pico W (i.e., copy your code to its Flash memory), you should hold down the BOOTSEL button when the board is being restarted.

To do this, unplug the power from the board, then hold the BOOTSEL button down and then connect the USB. The Pico will then appear as a USB Mass Storage Device to your computer. By dragging a special '.uf2' file onto the disk, you can write file to the Flash and restart the Raspberry Pi Pico W.

BOOTSEL Button

The main processor of the Raspberry Pi Pico W board is the RP2040 microcontroller made by Raspberry Pi company. It's a 32-bit processor in QFN56 package. The RP2040 features Dual Cortex M0+ processor cores, up to 133MHz, 264kB of embedded SRAM and 30 GPIO.

RP2040 Microcontroller

Connected to the ground (close coupled ground for differential USB signals).

Connected to the WL_GPIO1/SMPS PS pin (do not use)

Connected to the WL_GPIO0/LED (not recommended to be used)

 provides the 2.4GHz wireless and Bluetooth capabilities to the Raspberry Pi Pico W. It features includes:

Support for Bluetooth LE Central and Peripheral roles

The antenna is an onboard antenna licensed from ABRACON. 

The wireless interface is connected via SPI to the 

 monitor, so only when there isn’t an SPI transaction in progress can 

 DIN/DOUT and IRQ all share one pin on the 

Power

. Based on Raspberry Pi Pico W documentation, for best wireless performance, the antenna should be in free space. For instance, putting metal under or close by the antenna can reduce its performance both in terms of gain and bandwidth. Adding grounded metal to the sides of the antenna can improve the antenna’s bandwidth.

 supports the SWD debugging interface and these pins expose that interface so that it could be connected to the debug probe (a separate piece of hardware that can be purchased from Raspberry Pi). It's also possible to use another Raspberry Pi Pico W as a debugger.

The Raspberry Pi Pico W is a variation of the Raspberry Pi Pico board, adding Wi-Fi connectivity to the platform. It retains the same core features and form factor as the original Pico, including the 

 microcontroller, dual-core Arm Cortex-M0+ processors, and 26 GPIO pins. The primary difference is the on-board 2.4GHz 802.11n wireless interface using an 

It features flexible I/O options and support for multiple programming languages like C, C++, and MicroPython. Some of its major features include:

Dual-core Arm Cortex-M0+ processor, clocked up to 133 MHz

264 KB of SRAM and 2 MB of onboard flash memory

26 multi-function GPIO pins including 3 ADC

On-board single-band 2.4GHz wireless interfaces (802.11n, Bluetooth 5.2)

Support for Bluetooth LE Central and Peripheral roles and Bluetooth Classic

Provides 2 PIO (Programmable I/O) for custom peripheral interfacing

Support most of the well-known protocol like I2C, SPI, UART and PWM

Get comprehensive details on the Raspberry Pi Pico W development board: Pinout, Powering options, Peripherals & Programming.

 pins in the board can be used for PWM. The 

 has 8 independent PWM generators called slices, which each have two channels making it 16 PWM channels. The PWM frequency can be clocked from 8Hz to 62.5Mhz.

To generate a PWM signal in Arduino IDE on one of the PWM capable pins, you can use the 

The duty cycle of the PWM signal can be adjusted using the second parameter. By default the PWM uses the 8-bit resolution which means you can specify a value between 0 to 255 for the duty cycle.

In order to do any customization on the PWM signal, like changing the frequency or duty cycle, you can utilize functions like:

The Raspberry Pi Pico W has 26 multi-function GPIO pins, which can be used for digital input or output and configured for different communication protocols. They are named in the back of the board as 

All GPIOs support digital input and output, but 

 can also be used as inputs to the chip’s Analogue to Digital Converter (ADC).

 has also the following four GPIO pins that are used for the internal functions of the board:

 OP Controls the on-board SMPS Power Save pin

A GPIO pin can be used either as input or output pin. In the Arduino IDE, his should be specified first using the 

, the given pin will be internally connected to the 3.3V so that if the given pin is floated (i.e. you don't connect it to to either of 3.3V or GND) it will be read as 

The Raspberry Pi Pico W has the ability to set the current a pin can supply. The available current limits are 2mA, 4mA, 8mA and 12mA. By default, on a reset, the setting is 4mA (same as `pinMode(x, 

)`). You can also use the following values instead:

When the pin mode is set, you can read the value of an input pin like this:

Also to write a digital value to a pin, you can call the 

 function passing one of the constant values 

 along with the pin number to write it to:

GPIO

GP0,GP1,GP2,GP3,GP4,GP5,GP6,GP7,GP8,GP9,GP10,GP11,GP12,GP13,GP14,GP15,GP16,GP17,GP18,GP19,GP20,GP21,GP22,GP26,GP27,GP28

 pin, remember to connect at least one of the 

 pin of the board to your power supply ground. There are seven 

 pins in the Raspberry Pi Pico W, plus one exposed in the debug pins.

Ground

As it's connected to the USB ground wire, when the board is powered via USB, the 

 pins are already grounded to USB ground.

This is the main input voltage to the board in case it's not going to be powered by USB. It can vary in the range of 1.8V to 5.5V, and is used by the on-board SMPS to generate the 3.3V for the 

VSYS

This is connected to the micro-USB port input voltage. It is nominally 5V and when the USB is not connected or not powered, it will be in 0V level.

 (which is not exposed in the board) is set up via a voltage divider to monitor the existence of 

VBUS

This pin connects to the on-board SMPS enable pin, and is pulled high (to the 

) via a 100kΩ resistor. When you connect this pin to 

, it disables the 3.3V (which also de-powers the 

). So, you can use this pin to implement the power button for your board.

3V3_EN

The pin connects to the main 3.3V supply to the 

 and its I/O and is generated by the on-board SMPS. It can provide power to an external circuit. Th maximum output current depends on the 

 voltage. It is recommended to keep the load on this pin less than 300mA.

3V3 (OUT)

 and has an internal (on-chip) pull-up resistor to 3.3V of about ~50kΩ.

This pin is the ADC power supply and reference voltage. It is generated on Raspberry Pi Pico W by filtering the 3.3V supply. 

The board has a 12 bit ADC which means any analog input voltage will be converted to a number between 0 to 4095. By default the board considers the 3.3V as a reference and consider a signal on that level as 4095 and any signal with a value less than 3.3V will be converted to a number between 0 to 4094 accordingly. When the 

 is provided with another voltage level, that voltage will be considered as max (4095) and all the voltage levels below that will be mapped accordingly.

 can be powered at a nominal voltage between 1.8V and 3.3V, but the performance of the ADC will be compromised at voltages below 2.97V.

ADC_VREF

. In the Raspberry Pi Pico W, there is a separate analog ground plane running under these signals and terminating at this pin. If the ADC is not used or ADC performance is not critical, this pin can be connected to digital ground.

AGND

 processor of the Raspberry Pi Pico Whas a 4 channel 12-bit ADC at 500ksps, where three of them are exposed in the board as 

. The 12-bit ADC provides the resolution of 4096 value which means any analog input signal between 0V to 3.3V applied to these pins gets mapped proportionately to a value between 0 to 4095.

There is also another ADC channel that is dedicated to the internal temperature sensor in the 

. You can read the value in Arduino IDE by calling the 

. If you're supplying an external power to 

, then you have to specify that as a parameter to this method. Otherwise it assumes the 3.3V is used and the result will not be correct. This reading is not exceedingly accurate and of relatively low resolution.

ADC0,ADC1,ADC2

 is the Serial Clock pin used as clock signal between two chips communicating via the two-wire serial interface (TWI) also known as I2C.

I2C1 SCL

I2C0 SCL

I2C0 SDA

I2C1 SDA

 (Serial Clock) is a clock signal used to synchronize the processor and peripherals. The line is used as a shared line for all connected peripherals to a SPI bus.

SPI0 SCK

SPI1 SCK

 (Chip Select) is connected to each peripheral device and controller can enable or disable specific device using that. When controller set this pin for a specific device to low, it means that devices can communicate with the controller. When it's high, it means the device is disabled should ignore any data coming from the processor (i.e., 

). This enables the controller to connect to multiple SPI enabled peripherals and sharing the same 

SPI0 CSn

SPI1 CSn

 is for receiving data from the peripheral (e.g. a SPI LCD module) via SPI channel.

SPI0 RX

SPI1 RX

 is for sending data to the peripherals (e.g. a SPI LCD module) via SPI.

SPI0 TX

SPI1 TX

 is for sending data in a serial communication via UART channel.

USART

UART0 TX

UART

 is for receiving data in a serial communication via UART channel.

UART0 RX

UART1 RX

UART1 TX

The Raspberry Pi Pico W supports the SWD debugging protocol to debug the code running on he 

 pin is used for debug data I/O during the debugging process and it should be connected to the debugging probe. 

Serial Wire Debug

SWDIO

 pin is the clock used during the debugging process via SWD protocol and should be connected to the debugging probe. 

Digital I/O	23
Analog Input	3
PWM	16
ADC Resolution	4096
Interrupts	26

Input Voltage	5V
I/O Voltage	3.3V
I/O Current	12 mA

USB Micro B	1x
WiFi	802.11n Provided by Infineon CYW43439 module
Bluetooth	5.2 Provided by Infineon CYW43439 module

RTC	1x 32 bit
Timer	1x 64 bit
Watchdog Timer	1
Debug/Trace	SWD

Width	21 mm
Length	51 mm
Weight	10 g

Raspberry Pi Pico W Pinout, Projects & Spec

Related

Arduino Nano

Raspberry Pi Pico

Arduino Nano Every

Platform

I/O

Power

Communication Protocols

Connectivity

Peripherals

Dimensions

Manufacturer	Raspberry Pi
Processor	RP2040
Processor Family	Arm Cortex-M0+
Clock Speed	125 Mhz
Flash Memory	2 MB
SRAM	264 K
Programming	Arduino CLI Arduino IDE CircuitPython MicroPython PlatformIO Thonny