ShiboSoftwareDev/lp-msp430fr2476

This design implements a microcontroller-based development board featuring an MSP430FR2476 target MCU with associated power regulation, USB host interface with ESD protection, multiple headers for peripherals and BoosterPacks, and integrated status LEDs and sensors.

Version
1.0.0
License
unset
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README.md

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# LP-MSP430FR2476 — tscircuit edition

Fabrication-ready four-layer recreation of TI's LP-MSP430FR2476 LaunchPad. The design follows the four reference schematic sheets in TI SLAU802: eZ-FET host/USB, power, target and 40-pin headers, and LEDs/switches/sensor/battery.

## Implemented hardware

- MSP430FR2476TPT target in LQFP-48 with SBW programming and reset network
- MSP430F5528 eZ-FET host, protected Micro-USB data path, backchannel UART, and seven removable isolation links
- Conventional TLV70033 3.3 V LDO in place of TI's patented EnergyTrace switcher
- Standard 40-pin LaunchPad / BoosterPack header mapping
- 32.768 kHz crystal with removable 0 ohm links and 12 pF load capacitors
- S1 on P4.0, S2 on P2.3, reset button, green P1.0 LED, and RGB LED on P5.1/P5.0/P4.7
- TMP235A2 temperature sensor routed to A1/P1.1 through a removable power link and RC filter
- Bottom-side CR2032 holder with reverse-current diode and removable source jumper
- Four mounting holes, two fiducials, four copper layers, BOM, and pick-and-place output

For USB operation, fit all seven eZ-FET isolation shunts and leave the battery jumper open. For CR2032 operation, disconnect the eZ-FET 3V3 path and install the battery jumper. Remove `R_XIN` and `R_XOUT` if P2.1/P2.0 must be used as header GPIO instead of the 32.768 kHz crystal.

EnergyTrace current profiling is not implemented. The board remains programmable, debuggable, USB-UART capable, BoosterPack-compatible, and independently battery operable.

## Fabrication checks

- tscircuit `0.0.2332`
- default autorouter: 174 PCB traces and 173 vias
- via geometry: 0.30 mm finished hole, 0.45 mm pad
- Circuit JSON errors: 0
- source, readable-netlist, and placement checks: 0 errors and 0 warnings
- Gerber all-layer shorts check: clean at the default resolution and at 40 pixels/mm
- Gerber archive includes front/back/inner copper, masks, paste, silkscreen, edge cuts, plated drill, NPTH drill, BOM, and pick-and-place files

The two 32.768 kHz branches produce 10.25 mm and 12.14 mm advisory-length warnings against tscircuit's built-in 10 mm crystal limit. They are low-frequency, obstacle-aware routes and do not produce Circuit JSON DRC or Gerber-short errors.

## Rebuild

```sh
bun install
bunx tsci build
bunx tsci check source
bunx tsci check netlist
bunx tsci check placement
bunx tsci export index.circuit.tsx --format gerbers --output dist/gerbers.zip
bunx tsci check shorts index.circuit.tsx --mode gerber --layer all
bunx tsci check shorts index.circuit.tsx --mode gerber --layer all --pixels-per-mm 40
```

References: [TI LP-MSP430FR2476 product page](https://www.ti.com/tool/LP-MSP430FR2476), [TI SLAU802 user guide](https://www.ti.com/lit/ug/slau802/slau802.pdf), and [MSP430FR2476 datasheet](https://www.ti.com/lit/ds/symlink/msp430fr2476.pdf).