4 layers53.3 × 73.7 mm
Tag breakout l432-u375-lipo v1
tag-designs/hardware
Hardware designs for tags and bases
55 parts2CERN-OHL-P-2.0
2 layers48.3 × 43.2 mm
MultiCharger
tag-designs/hardware2Hardware designs for tags and bases
- Size
- 48.3 × 43.2 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 26
- Nets
- 14
- Pads
- 80
- Tracks, vias
- 127, 13
- Pours
- 2
- Routed
- Yes
- KiCad
- KiCad 6 (file 20211014)
- Created
- 27 Apr 2026
- Updated
- 5 Nov 2026
Overview
MultiCharger is an open-source printed circuit board by tag-designs, from the tag-designs/hardware repository on GitHub, published under the CERN-OHL-P-2.0 licence. It is a 2-layer board of 48.3 × 43.2 mm with 26 parts on 14 nets, routed with 127 tracks and 13 vias.
It is built around the TLV6700DDC. Its parts include 8 resistors, 4 diodes, 4 connectors, 3 capacitors and 2 ICs.
Main components
1README
README.mdTag Designs: Hardware
Board and mechanical designs for the ultralight archival data loggers (tags) documented at https://tag-designs.github.io/.
| Path | Holds |
|---|---|
BoardDesigns/ | KiCad schematics and layouts for the tags and base boards, with their KiBot fabrication configurations |
Mechanical/ | OpenSCAD sources for cases, carriers and harness jigs |
docs/ | The hardware documentation site, published at https://tag-designs.github.io/hardware/ |
STM32_open_pin_data | ST's pin-data submodule, used by the design-rule helpers |
Board designs reach the shared symbol and footprint libraries through
${KIPRJMOD}/../../, so a board is tied to its depth in the directory tree.
Moving one between directories is more than a move.
Regenerating the figures
The documentation's board renders and schematic PDFs are generated from the KiCad files and committed, because the workflow that publishes the site has no KiCad in it. After editing a board:
cmake -S BoardDesigns -B build-boards
cmake --build build-boards --target board-docsBoardDesigns/REGENERATING.md covers the
targets, the three checks that guard the figures, what each of their messages
means, and why generation is not done in CI. Read it before chasing a render
that looks wrong — in particular, kicad-cli reports nothing at all when it
cannot find a 3D model.
License
Copyright © 2018–2026 The Trustees of Indiana University.
This source describes Open Hardware and is licensed under the CERN Open
Hardware Licence Version 2 — Permissive (CERN-OHL-P-2.0). You may
redistribute and modify this source and make products using it under the terms
of that licence, whose full text is in LICENSE and at
https://ohwr.org/cern_ohl_p_v2.txt.
This source is distributed WITHOUT ANY EXPRESS OR IMPLIED WARRANTY, INCLUDING OF MERCHANTABILITY, SATISFACTORY QUALITY AND FITNESS FOR A PARTICULAR PURPOSE. Please see the licence for applicable conditions.
The STM32_open_pin_data submodule is ST's and carries its own license. The
software that runs on these boards lives in a separate repository under the MIT
License; see the
project licensing summary.
Parts
26| Qty | Value | Footprint | References |
|---|---|---|---|
| 4 | Mounting_Hole | Mounting_Holes:MountingHole_2.2mm_M2 | MK101, MK102, MK103, MK104 |
| 3 | 1K | Resistor_SMD:R_0402_1005Metric | R101, R102, R105 |
| 2 | Conn_01x02 | Connector_JST:JST_PH_B2B-PH-K_1x02_P2.00mm_Vertical | J101, J102 |
| 1 | 0.1uF | Capacitor_SMD:C_0402_1005Metric | C101 |
| 1 | 130K | Resistor_SMD:R_0402_1005Metric | R104 |
| 1 | 1500 | Resistor_SMD:R_0402_1005Metric | R106 |
| 1 | 1uF | Capacitor_SMD:C_0402_1005Metric | C106 |
| 1 | 2.2uF | Capacitor_SMD:C_0402_1005Metric | C107 |
| 1 | 2000 | Resistor_SMD:R_0402_1005Metric | R107 |
| 1 | 620 | Resistor_SMD:R_0402_1005Metric | R1 |
| 1 | 910K | Resistor_SMD:R_0402_1005Metric | R103 |
| 1 | D | Diode_SMD:D_0402_1005Metric | D104 |
| 1 | Go | LED_SMD:LED_0603_1608Metric | D103 |
| 1 | LED | LED_SMD:LED_0603_1608Metric | D102 |
| 1 | No Go | LED_SMD:LED_0603_1608Metric | D101 |
| 1 | SW_DIP_x03 | Button_Switch_SMD:SW_DIP_SPSTx03_Slide_9.78x9.8mm_W8.61mm_P2.54mm | SW101 |
| 1 | TLV6700 | Package_TO_SOT_SMD:SOT-23-6 | U101 |
| 1 | TLV70A933_SOT23-5 | Package_TO_SOT_SMD:SOT-23-5 | U106 |
| 1 | Tagbase | MultiCharger:6pin_tagpoints_new_offset | J103 |
| 1 | USB_B_Mini | Connector_USB:USB_Mini-B_Lumberg_2486_01_Horizontal | J104 |
Questions
How big is the MultiCharger PCB?
It measures 48.3 × 43.2 mm and has 2 copper layers, 1.6 mm thick.
What parts does the MultiCharger use?
26 parts, built around the TLV6700DDC. 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 MultiCharger KiCad files?
From the tag-designs/hardware repository on GitHub, at the commit this page was made from: the board is BoardDesigns/Chargers/MultiCharger/MultiCharger.kicad_pcb. PCBKit opens the board in the browser, with nothing to install.
Can I use the MultiCharger design in my own project?
Its repository publishes it under the CERN-OHL-P-2.0 licence: you may reuse it on that licence's terms (keep the author's notice, and for a copyleft licence share your changes alike).
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