RP2040

The RP2040 is a 32-bit dual ARM Cortex-M0+ microcontroller integrated circuit by Raspberry Pi Foundation.[1][2][3] At the same time, it was released as part of the Raspberry Pi Pico board.[1]

RP2040 microcontroller

Overview

Announced on 21st January 2021, the RP2040 is the first microcontroller designed by the Raspberry Pi Foundation.[1][2] The microcontroller is low cost, with the Raspberry Pi Pico being introduced at US$4. The microcontroller can be programmed in C/C++ and MicroPython.[1] It is powerful enough to run TensorFlow Lite.[1]

At announcement time four other manufacturers (Adafruit, Pimoroni, Arduino, SparkFun) were at advanced stages of their product design, awaiting the widespread availability of chips to be put in to production.[4] SparkFun has since released products based around the RP2040.[5]

Hackaday notes the benefits of the RP2040 as being from the Raspberry Pi Foundation, having a good feature set, and being released in low-cost packages.[6]

Per the datasheet, there are multiple versions of the chip:
"The full source for the RP2040 bootROM can be found at https://github.com/raspberrypi/pico-bootrom.
This includes both version 1 and version 2 of the bootROM, which correspond to the B0 and B1 silicon revisions, respectively."

Features

The chip is 40nm silicon in a 7 × 7 mm QFN-56 SMD package.

  • Key features: [7]
    • 133 MHz dual ARM Cortex-M0+ cores (can be overclocked to over 400 MHz[8])
      • Each core has an integer divider peripheral, and two interpolators.
    • 264 KB SRAM in six independent banks
    • No internal Flash or EEPROM memory (after reset, the boot-loader loads firmware from either external flash memory or USB bus into internal SRAM)
    • QSPI bus controller, supporting up to 16 MB of external Flash memory
    • DMA controller
    • AHB crossbar, fully-connected
    • On-chip programmable LDO to generate core voltage
    • 2 on-chip PLLs to generate USB and core clocks
    • 30 GPIO pins, of which 4 can optionally be used as analog inputs
  • Peripherals:
    • 2 UARTs
    • 2 SPI controllers
    • 2 I²C controllers
    • 16 PWM channels
    • USB 1.1 controller and PHY, with host and device support
    • 8 PIO state machines

Boards

A number of manufacturers have announced their own boards using the RP2040.

Board name Manufacturer Size (mm) Header pins Debug connection Number of pads USB connector Other connectors Flash size GPIO pins ADC pins Buttons Other features Image
Pico[9] Raspberry Pi Foundation 51x21 40+3 via headers 6 micro-USB 2MB 26 3 BOOTSEL
Nano RP2040 Connect[10] Arduino 45x18 30 via pads 5+4+2 micro-USB 16MB 1 WiFi, Bluetooth, 9-axis IMU, microphone
Tiny 2040[11] Pimoroni 22.9x18.2x6 8+3 via headers USB-C 8MB 12 4 BOOTSEL + RESET
Keybow 2040[12] Pimoroni 0 (USB only) USB-C 16 keys
PicoSystem[13] Pimoroni 0 (self contained) USB-C 4 + joypad Color 240x240 LCD, onboard battery
Feather RP2040[14] Adafruit 50.8x22.8x7 28 via pins USB-C STEMMA QT, lipo battery 8MB 21 4 BOOTSEL + RESET Battery charger
ItsyBitsy RP2040[15] Adafruit 36x18x4 33 via headers micro-USB 4MB 23 4 BOOTSEL + RESET
Pro Micro - RP2040[16] Sparkfun 36x18 24 4+2 USB-C QWIIC 16MB 20 4 BOOTSEL + RESET
Thing Plus RP2040[17] Sparkfun 59x23 28 JTAG pins USB-C QWIIC, lipo battery 16MB 18 4 BOOTSEL + RESET Battery charger
MicroMod RP2040[18] Sparkfun 22x22 0 edge connector edge connector 16MB 29 3 none

See also
  • Arduino - a popular microcontroller board family
  • ESP32 - a series of low-cost, low-power system on a chip microcontrollers with integrated Wi-Fi and dual-mode Bluetooth.
  • STM32 - a family of 32-bit microcontroller integrated circuits
  • Raspberry Pi - Raspberry Pi's series of small single board computers

References
  1. "Meet Raspberry Silicon: Raspberry Pi Pico now on sale at $4". January 21, 2021.
  2. Adams, James (1 February 2021). "Raspberry Pi RP2040: Our Microcontroller for the Masses". Arm Blueprint. Retrieved 20 February 2021.
  3. "RP2040 Datasheet" (PDF). Raspberry Pi Foundation. Retrieved 20 February 2021.
  4. "Tweet". twitter.com. Retrieved 2021-02-18.
  5. "RP2040 - A microcontroller from Raspberry Pi - SparkFun Electronics". www.sparkfun.com. Retrieved 20 February 2021.
  6. Williams, Elliot (20 January 2021). "Raspberry Pi Enters Microcontroller Game With $4 Pico". Hackaday. Retrieved 20 February 2021.
  7. "RP2040 Datasheet" (PDF). RaspberryPi.org. Retrieved 2021-03-28.
  8. "Robin Grosset Takes a Raspberry Pi Pico's RP2040 to New Heights with an Overclock to 420MHz". Hackster.io. Retrieved 2021-03-28.
  9. "Buy a Raspberry Pi Pico".
  10. "Welcome Raspberry Pi to the world of microcontrollers". 20 January 2021.
  11. "Tiny 2040 – Pimoroni".
  12. "Keybow 2040 – Pimoroni".
  13. "PicoSystem – Pimoroni".
  14. "Adafruit Feather RP2040".
  15. "Adafruit ItsyBitsy RP2040".
  16. "SparkFun Pro Micro - RP2040 - DEV-18288 - SparkFun Electronics".
  17. "SparkFun Thing Plus - RP2040 - DEV-17745 - SparkFun Electronics".
  18. "SparkFun MicroMod RP2040 Processor - DEV-17720 - SparkFun Electronics".
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