RP2350 General FeaturesThe SparkFun Thing Plus - RP2350 is a dynamic and powerful wireless development platform in the Thing Plus form factor. Built around the RP2350 microcontroller from the Raspberry Pi Foundation, this board includes their radio module for single-band 2.4 GHz WiFi 4 (802.11n) and Bluetooth® 5.2 along with standard hardware components found on all Thing Plus Boards. This includes on-board Lithium Ion (LiPo) battery charging and fuel gauge circuits, µSD card socket, Qwiic connector, and the Thing Plus pinout, allowing use of the RP2350 Thing Plus in a wide variety of both local and remote applications. The RP3250 is a unique dual-core microcontroller with two ARM® Cortex® M33 processors and two Hazard3 RISC-V processors, all running at up to 150 MHz! Now, this doesn't mean the RP2350 is a quad-core microcontroller. Instead, users can select which two processors to run on boot. You can run two processors of the same type or one of each. The RP2350 also features 520kB SRAM in ten banks, a host of peripherals including two UARTs, two SPI and two I2C controllers, and a USB 1.1 controller for host and device support. The Raspberry Pi Radio Module (RM2) operates over an SPI interface, and we've designed this board to use the same pins for the radio module as official Raspberry Pi boards, making it easy to use the radio module without having to adjust anything from those development boards. Along with supporting both WiFi 4 and Bluetooth® 5.2, the RM2 supports both basic (1 Mbps) and enhanced (2 or 3 Mbps) data rates for standard Bluetooth as well as BLE (Low Energy). The RP2350 Thing Plus includes two expanded memory options: 16MB of external Flash and 8MB PSRAM connected to the RP2350's QSPI controller. This Thing Plus board works with C/C using the Pico SDK, MicroPython, CircuitPython, and Arduino development environments. Warning: LiPo Battery Connector Polarity The LiPo battery connector on v10 of the Thing Plus - RP2350 is reversed from SparkFun's normal 2-pin JST battery connection. If you are using this board with a LiPo battery, follow the silkscreen markings on the board for correct polarity. v10 of the Thing Plus - RP2350 is incompatible with all single-cell LiPo batteries SparkFun carries. Future versions of this board will resolve this issue. Features & Specs SparkFun Thing Plus - RP2350 Features RP2350 21 Multifunctional GPIO* *"Freebie" pin tied to WS2812 Data Out 13x GPIO (3 Analog-capable pins) 1x UART 1x I2C 1x SPI Raspberry Pi Radio Module (RM2) WiFi 4 Bluetooth 5.2 BDR (1 Mbps) EDR (2 or 3 Mbps) Thing Plus Form-Factor: Dimensions: 2.3" x 0.9" Four Mounting Holes: 4-40 screw compatible 28 PTH Pins USB-C Connector 2-pin JST Connector for a LiPo Battery (not included) 4-pin JST Qwiic Connector µSD Card Slot MCP73831 LiPo Battery Charger MAX17048 Fuel Gauge LEDs:  PWR - Red power LED CHG - Yellow battery charge status LED STAT - Blue status LED tied to the RM2's GPIO0 WS2812 RGB LED - Data In tied to GPIO14 RP2350 General Features Dual ARM CortexM3 and Hazard3 RISC-V Processors User-selectable for dual-cores 520kB integrated SRAM in 10 banks 5V-tolerant GPIO (powered) with 3.3V failsafe (unpowered) Peripherals 2x UART 2x SPI 2x I2C 4 HSTX Pins (Rasbperry Pi's High-speed transmit interface) 24x PWM Channels 12x PIO State Machines Resources Hardware Schematic Eagle Files Board Dimensions RP2350 Product Brief Software SparkFun Pico SDK Library Arduino Pico Arduino Core MicroPython Firmware UF2 CircuitPython Downloads Datasheet RP2350 APS6404L PSRAM Guide Hookup Guide What is MicroPython? Other Documentation GitHub Hardware Repo Qwiic Info Page RP2350 Info Page RP2350 Documentation