RP2040

Announced on 21st January 2021, the RP2040 is the first microcontroller designed by Raspberry Pi Ltd (was Raspberry Pi Trading Ltd).[1][2] The microcontroller is low cost, with the Raspberry Pi Pico being introduced at US$4 and the RP2040 itself costing US$1. The microcontroller can be programmed in Assembly, Rust, 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 Raspberry Pi, 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."

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

A number of manufacturers have announced their own boards using the RP2040. A selection of the growing number is here:

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 Ltd	51x21	40+3	via headers	6	micro-USB		2MB	26	3	BOOTSEL
XIAO RP2040	Seeedstudio	20x17.5x3.5	30	Reset Button/ Boot Button		USB Type-C interface		2MB			1 RESET button, 1 BOOT button
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
QtPy RP2040[16]	Adafruit	20x17.5x3.5	30	Reset Button/ Boot Button		USB Type-C interface		8MB			1 RESET button, 1 BOOT button	3.3vdc regulator, NeoPixel LED
Pro Micro - RP2040[17]	Sparkfun	36x18	24		4+2	USB-C	QWIIC	16MB	20	4	BOOTSEL + RESET
Thing Plus RP2040[18]	Sparkfun	59x23	28	JTAG pins		USB-C	QWIIC, lipo battery	16MB	18	4	BOOTSEL + RESET	Battery charger
MicroMod RP2040[19]	Sparkfun	22x22	0			edge connector	edge connector	16MB	29	3	none

• 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

Wikimedia Commons has media related to RP2040.

• Official webpage