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Std edition AS2040
Profile：Create a tiny expandable development board with an RP2040, USB-C, sensors, STEMMA I2C and plenty of IO.
License: CC-BY-NC-SA 3.0
Description
At the heart of the board is the RP2040. I chose it because it is a Dual-Core ARM Cortex-M0+ at 133MHz which is great performance at a low cost and small package. It provides unrivaled power and flexibility with large on-chip memory, symmetric dual-core processor complex, deterministic bus fabric, and rich peripheral set with unique Programmable I/O (PIO) subsystem. With detailed documentation, a polished MicroPython port, and a UF2 bootloader in ROM, it has the lowest possible barrier to entry.
AS2040 Board Features:
- RP2040 32-bit Cortex M0+ dual core running at ~125 MHz @ 3.3V logic and power
- 264 KB SRAM in six independent banks
- 16 MB SPI FLASH chip for storing files and code (no EEPROM)
- 11 x GPIO pins with following capabilities:
- 4x 12 bit ADCs
- I2C, SPI and UART peripherals
- PWM outputs - for servos, LEDs, etc
- PIO compatibility
- 3.3V, 5V and GND pins
- 3.3V regulator with 500mA peak current output
- 6-axis accelerometer and gyroscope
- RGB NeoPixel for full color indication
- 12 MHz crystal for perfect timing
- On-board STEMMA QT connector that lets you quickly connect any Qwiic/STEMMA QT or Grove I2C devices with no soldering
- Both Run button and Boot select button for quick restarts (no unplugging-replugging to relaunch code or upload firmware)
- Optional SWD debug port can be soldered in for debug access
- USB Type C connector lets you access built-in ROM USB bootloader and serial port debugging
- Mounting hole
- Measures (32mm x 26mm x 1mm) without headers soldered in
Design Drawing
schematic diagram
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PCB
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| ID | Name | Designator | Footprint | Quantity |
|---|---|---|---|---|
| 1 | 4pF | C2,C3 | C0402 | 2 |
| 2 | 100nF | C5,C6,C7,C9,C11,C12,C13,C14,C15,C17,C18 | C0402 | 11 |
| 3 | 1uF | C8,C10,C1,C4 | C0402 | 4 |
| 4 | NSR0320MW2T1G | D3,D1,D2 | SOD-323_L1.8-W1.3-LS2.5-RD | 3 |
| 5 | TC2020RGB-3CJH-TX1812Z5 | LED2 | LED-SMD_4P-L2.1-W2.1-TL_TC2020RGB | 1 |
| 6 | 1K | R1,R5 | R0402 | 2 |
| 7 | 10K | R2,R8 | R0402 | 2 |
| 8 | 27 | R3,R4 | R0402 | 2 |
| 9 | 5.1K | R9,R10,R12,R13,R14,R6,R7 | R0402 | 7 |
| 10 | GT-TC032A-H015-L1 | SW1,SW2 | SW-SMD_L3.1-W2.5-LS4.0 | 2 |
| 11 | RP2040 | U1 | LQFN-56_L7.0-W7.0-P0.4-EP | 1 |
| 12 | W25Q128JVPIQ | U2 | WSON-8_L5.0-W6.0-P1.27-BL-EP | 1 |
| 13 | 12MHz | X1 | OSC-SMD_4P-L3.2-W2.5-BL | 1 |
| 14 | 10uF | C19 | C0402 | 1 |
| 15 | OSG50402C1C | LED1 | LED0402-RD_GREEN | 1 |
| 16 | XL-1005UGC | LED3 | LED0R | 1 |
| 17 | 100K | R11 | R0402 | 1 |
| 18 | AP2112K-3.3TRG1 | U6 | SOT-25-5_L3.0-W1.8-P0.95-LS3.0-BR | 1 |
| 19 | MCP73831T-2ACI/OT | U8 | SOT-23-5_L3.0-W1.7-P0.95-LS2.8-BR | 1 |
| 20 | HDR_CON_TH_1x11_2.54 | J1,J2 | HDR_CON_TH_1X11_2.54 | 2 |
| 21 | SWD-10_SMD | SWD1 | SWD-10-SMD | 1 |
| 22 | USB3.1C16PFSMT | USBC1 | USB-C-SMD_TYPE-C-USB-17 | 1 |
| 23 | STEMMA_I2C_QT | CONN1 | JST_SH4 | 1 |
| 24 | LSM6DSRTR | U4 | LGA-14_L3.0-W2.5-P0.50-BR | 1 |
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