====== Raspberry Pi Edge Class Devices Hardware Review ======
{{:en:iot-open:czapka_b.png?50| General audience classification icon }}{{:en:iot-open:czapka_e.png?50| General audience classification icon }}\\
The Raspberry Pi Pico is the MCU development board that uses the chip RP2040, designed by Raspberry Pi in 2019. 

== Hardware ==

It is intended as a low-cost, low-power device with big computational possibilities and connectivity features. This device is intended to work with constrained power sources, mainly battery-powered. The MCU integrates all features, including 6 banks of RAM, an interrupt controller, DMA, timers, oscillators, I/O, voltage regulator and ROM in a single enclosure.\\
A compact, 7x7mm chip exposes 26 GPIOs and is one of the most affordable MCUs, estimated at 4 USD/piece only.

Currently, there are 2 types of development boards available: Raspberry Pi Pico and Raspberry Pico W. The last one provides wireless connectivity. It is also possible to have just MCUs (RP2040) as chips to be soldered; thus, third-party development boards are available in the market.
A genuine RPi Pico W development board is present in the figure {{ref>rpipicow}}.\\
With a built-in voltage regulator, the input voltage range is wide and starts from 1.8V up to 5.5V.

<figure rpipicow>
{{ :en:iot-open:hardware2:raspberrypi:rpipicow.jpg?400 | Rapsberry Pi Pico W development board}}
<caption>Rapsberry Pi Pico W development board</caption>
</figure>

== CPU ==
The CPU is an ARM Cortex-M0+ (double core) running up to 133 MHz (scalable). It supports DMA. There is no FPU, however. A Nested Vector Interrupt Controller is also present, along with a 24-bit timer. CPU and NIC can be put into the very low power mode.

== Memory ==
RPI Picos have 264kB of internal RAM (SRAM) and 2MB of built-in QSPI flash with the capability for an extension with external one up to 16MB. RAM uses DMA to perform CPU-less transfers.\\
There is a 16kB ROM that contains bootloaders, USB mass storage UF2 support and utility libraries such as FPU implementation.

== Networking ==
Only the Pico W series includes a built-in radio that is 802.11n (2.4 GHz WiFi) and Bluetooth 5.2.\\ IoT-specific protocols are supported only with external modules.

== Peripherals ==
The Pico MCU includes a rich set of peripheral interfaces:
    * 26 multipurpose GPIO inputs/outputs,
    * 2xUART,
    * 2xSPI,
    * 2xI2C,
    * 15 PWM channels,
    * 4xADC 12-bit (500ksps) converters where only 3 are usable, with a temperature sensor (for compensation),
    * 8 programmable state machines,
    * USB 1.1 controller (PHY) with HOST and DEV.