2 layers54.5 × 52.1 mm
Caravel pcb
efabless/caravel_board
This repo provides firmware examples, flash programming and diagnostic tools for testing Open MPW and chipIgnite projects using Caravel.
73 parts40
2 layers76.2 × 70.2 mm
Caravel pcb v3 FTDI flexy fixed
chipfoundry/caravel_board1This repository provides firmware examples, flash programming tools, and diagnostic utilities for testing chipIgnite projects using the Caravel SoC.
- Size
- 76.2 × 70.2 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 60
- Nets
- 86
- Pads
- 359
- Tracks, vias
- 836, 104
- Pours
- 2
- Routed
- Yes
- KiCad
- KiCad 6 (file 20211014)
- Created
- 6 May 2025
- Updated
- 30 Jun 2026
Overview
Caravel pcb v3 FTDI flexy fixed is an open-source printed circuit board by chipfoundry, from the chipfoundry/caravel_board repository on GitHub. It is a 2-layer board of 76.2 × 70.2 mm with 60 parts on 86 nets, routed with 836 tracks and 104 vias.
It is built around the SN74LVC1G125DCKR-GK, W25Q32FVSSIG and AZ1117CH-1.8TRG1, with the FT232H and CSTNE12M0GH5L000R0 among its other parts. Its parts include 22 capacitors, 13 resistors, 10 connectors, 7 ICs and 3 diodes.
Main components
5
SN74LVC1G125DCKR-GK
SOT-353SOT-353 Buffers, Drivers, Receivers, Transceivers ROHSGOODWORKBuffers, Drivers, Receivers, Transceivers
W25Q32FVSSIG
SOIC-8-208milSOIC-8-208mil NOR FLASH ROHSWinbond ElecNOR FLASH
AZ1117CH-1.8TRG1
SOT-223-20℃~+125℃@(Tj) 0.003%Vout 1 1.2V@(800mA) 1.35A 1.8V 15V 4mA 70dB@(120Hz) Fixed Over Current Protection、Over Temperature Protection Positive SOT-223 Voltage Regulators - Linear, Low Drop Out (LDO) Regulators ROHSDiodes IncorporatedVoltage Regulators - Linear, Low Drop Out (LDO) RegulatorsFT232H
UncategorisedFTDI
CSTNE12M0GH5L000R0
SMD3213-3P-40℃~+85℃ 12MHz 30Ω 33pF SMD3213-3P Ceramic Resonators ROHSMurataCeramic Resonators
README
README.mdCaravel Board
ChipFoundry - Firmware and hardware support for chipIgnite projects using Caravel.
This repository provides firmware examples, flash programming tools, and diagnostic utilities for testing chipIgnite projects using the Caravel SoC. It also includes schematics, layout files, and Gerber files for PCB evaluation and breakout boards.
chipIgnite Projects
This repository is optimized for chipIgnite shuttle projects. For detailed testing instructions and firmware examples, see the chipIgnite README.
Quick Start
The firmware/chipignite/ directory contains all the tools and examples you need to get started with your chipIgnite project.
Firmware
Requirements
- Python 3.6 or later
- RISC-V toolchain (see installation instructions below)
- USB micro B cable for connecting the evaluation board
Getting Started with chipIgnite
To program your chipIgnite project on Caravel, connect the evaluation board using a USB micro B connector.
pip3 install pyftdi
cd firmware/chipignite/blink
make clean flashInstall Toolchain for Compiling Code
For Mac
https://github.com/riscv/homebrew-riscv
For Linux
https://github.com/riscv/riscv-gnu-toolchain
Diagnostics
ChipFoundry provides diagnostic tools for chipIgnite projects:
firmware/chipignite/util/caravel_hkflash.py- Programs flash on the board through Caravel's housekeeping SPI interfacefirmware/chipignite/util/caravel_hkdebug.py- Menu-driven debug interface for Caravel via housekeeping SPI
These tools are used automatically by the Makefiles in the firmware project directories.
Hardware
The current evaluation board for Caravel can be found here
- The clock is driven by X1 with a frequency of 10MHz. To drive the clock with custom frequency, disable X1 through J6 and use the external pin for
xclk - The voltage regulator U5 and U6 supply
1.8Vand3.3Vthrough J8 and J9. The traces have to be cut if they are supplied externally. vccd1is connected to1.8Vthrough J3. The trace has to be cut if it is supplied externallyvddiois connected to3.3Vthrough J5. The trace has to be cut if it is supplied externally
The most updated breakout board for Caravel can be found here
ChipFoundry - Enabling chipIgnite projects with Caravel SoC support.
For more information, visit ChipFoundry on GitHub.
Parts
60| Qty | Value | Footprint | References |
|---|---|---|---|
| 9 | 0.1uf - CC0805KRX7R9BB104 | Capacitor_SMD:C_0805_2012Metric | C2, C3, C4, C5, C6, C7, C8, C15, C22 |
| 7 | 10k - RC0805FR-0710KL | Resistor_SMD:R_0805_2012Metric | R1, R7, R8, R9, R10, R12, R13 |
| 4 | 100uf - GRM31CR60J107ME39L | Capacitor_SMD:C_1206_3216Metric | C9, C10, C11, C12 |
| 4 | 10uf - CC0805KKX5R8BB106 | Capacitor_SMD:C_0805_2012Metric | C13, C14, C18, C19 |
| 4 | Conn_01x02_Male | Connector_PinHeader_2.54mm:PinHeader_1x02_P2.54mm_Vertical | J5, J6, J8, J9 |
| 3 | LED - 17-215SURC/S530-A2/TR8 | LED_SMD:LED_1206_3216Metric | D1, D2, D3 |
| 2 | 10k | Resistor_SMD:R_0805_2012Metric | R5, R6 |
| 2 | 150 - 0805W8J0151T5E | Resistor_SMD:R_0805_2012Metric | R3, R4 |
| 2 | 1uf | Capacitor_SMD:C_0805_2012Metric | C20, C21 |
| 2 | 22uf - CC0805MKX5R5BB226 | Capacitor_SMD:C_0805_2012Metric | C16, C17 |
| 2 | Conn_01x02_Female | Connector_PinHeader_2.54mm:PinHeader_1x02_P2.54mm_Vertical | J2, J3 |
| 2 | SN74LVC1G125DCKR | strive_foot_prints:SOT65P210X110-5N | U2, U3 |
| 1 | 0.01uf - CC0805JRX7R9BB103 | Capacitor_SMD:C_0805_2012Metric | C1 |
| 1 | 12K 1% - 0805W8F1202T5E | Resistor_SMD:R_0805_2012Metric | R2 |
| 1 | 82 - 0805W8F820JT5E | Resistor_SMD:R_0805_2012Metric | R11 |
| 1 | AZ1117-3.3 | Package_TO_SOT_SMD:SOT-223 | U5 |
| 1 | AZ1117CH-1.8TRG1 | Package_TO_SOT_SMD:SOT-223 | U4 |
| 1 | CSTNE12M0GH5L000R0 | strive_foot_prints:CSTNE12M0GH5L000R0 | Y1 |
| 1 | Conn_01x06_Female | Connector_PinHeader_2.54mm:PinHeader_1x06_P2.54mm_Vertical | J7 |
| 1 | Conn_01x20_Female | Connector_PinHeader_2.54mm:PinHeader_1x27_P2.54mm_Vertical | J11 |
| 1 | Conn_01x27_Female | Connector_PinHeader_2.54mm:PinHeader_1x27_P2.54mm_Vertical | J10 |
| 1 | DSC6001_10MHZ | strive_foot_prints:DSC6001JE1A-010.0000 | X1 |
| 1 | FT232H | FT232HQ-REEL:QFN50P800X800X90-49N | U1 |
| 1 | Logo | Caravel_Board:logo | T1 |
| 1 | Logo | Caravel_Board:ef_logo | T2 |
| 1 | SW_Push - SKQGADE010 | strive_foot_prints:SW4-SMD-5.2X5.2X1.5MM | SW1 |
| 1 | USB_B_Micro - 10118193-0001LF | strive_foot_prints:FCI_10118193-0001LF | J1 |
| 1 | W25Q32FVSS | strive_foot_prints:SOIC127P790X216-8N | U7 |
| 1 | caravel_breakout | Caravel_Board:caravel_breakout_flexy | U6 |
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Questions
How big is the Caravel pcb v3 FTDI flexy fixed PCB?
It measures 76.2 × 70.2 mm and has 2 copper layers, 1.6 mm thick.
What parts does the Caravel pcb v3 FTDI flexy fixed use?
60 parts, built around the SN74LVC1G125DCKR-GK, W25Q32FVSSIG, AZ1117CH-1.8TRG1 and FT232H. The full list of its parts is on this page, with links to each part's symbol and footprint where PCBKit's library has them.
Where can I download the Caravel pcb v3 FTDI flexy fixed KiCad files?
From the chipfoundry/caravel_board repository on GitHub, at the commit this page was made from: the board is hardware/development/_archive/caravel_pcb_v3_FTDI_prev/caravel_pcb_v3_FTDI_flexy_fixed.kicad_pcb. PCBKit opens the board in the browser, with nothing to install.
Can I use the Caravel pcb v3 FTDI flexy fixed design in my own project?
Its repository states no licence, so its author keeps all rights: ask chipfoundry before reusing the design.