This repo contains all the files, including production-ready gerber files, for this PCB:
It contains all components on-board to keep the caravel management controller happy and breaks out the user IO lines into the same footprint as a DIP-40 IC. The board is meant for both prototyping, i.e. on a breadboard, or use as a module on another PCB.
Specifically, it has:
- Space for any GFMPW IC
- Socket for spiflash IC containing mangement controller firmware, plus required level shifters and 3.3V voltage regulator
- Power-on reset circuitry
- LED on
gpio - Breakouts for pins
mprj_io[37:5]as well asmprj_io[0],mprj_io[1]andmprj_io[4]
Note: the board does not have the capability to program the 25Q32 spiflash in-place. You will need to solder it to a breakout board such as this and socket it using female headers on the GFMPW breakout. To program it, any number of portable ROM programmers can be used, such as the CH341A (I recommend this device as it is supported by the flashrom utility on most Linux distros).
The pinout of the board is as such (a KiCad symbol is also available):
Note that 3V3 is a output from the on-board voltage regulator. The only power input is 5V.
To edit the KiCad files, you will need to add the Caravel_Board.pretty footprint files from the efabless/caravel_board repo, which can be obtained here.
| Designator(s) | Value | TME # | Mouser # |
|---|---|---|---|
| U1 | AMS1117-3.3 | AZ1117H-3.3TRE1 | 595-REG1117-3.3 |
| U2 | 25Q32 or compatible | MX25L1006EMI-10G | 454-W25Q32JVSSIMTR |
| U3 | MCP1319MT | MCP1319MT-29LT | 579-MCP1319MT29LE/OT |
| U4 | GFMPW IC | N/A | N/A |
| U5, U6, U7, U8 | SN74LV1T34 | SN74LV1T34DBVRG4 | 595-SN74LV1T34DBVRG4 |
| D1, D2 | LED 1206 (metric 3216) | 24-21SURC/S530-A2 | 630-HSMH-H150 |
| R1, R3, R3 | 1K 1206 (metric 3216) | 1206S4F1001T5E | 71-RCA12061K00JNEA |
| R2 | 10K 1206 (metric 3216) | 1206S4F1002T5E | 667-ERA-8VEB1002V |
| C1, C2, C3 | 100nF 1206 (metric 3216) | 1206B104J500CT | 581-KAM31BR71H104KT |