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Add the USB camera (IMX662, Sunplus UVC) to the BoM, with a first measurement report

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Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01DDwfd6Ki8UfG4hK6W5YpJz
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Mikkeli Matlock
2026-10-11 17:21:10 +09:00
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docs/BOM.md
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@@ -77,6 +77,25 @@ type: reference
The shunt value is unconfirmed; check the schematic before converting shunt mV to amps.
- No GPIO or shutdown signal on the module; the BOOT button may be needed to wake a battery that stopped outputting (FAQ).
## USB camera (IMX662, Sunplus UVC bridge)
| Field | Value |
|-------|-------|
| **Sensor** | Sony IMX662 per the seller (1/2.8", STARVIS 2, low-light); the USB bridge does not report it |
| **USB ID** | `1bcf:2d4f` (Sunplus Innovation Technology, "USB Camera 1080P"), USB 2.0 high-speed |
| **Purpose** | Camera for the Orin: recording, live view on the tablet, later inference (roles open; see project-yukart roadmap, Phase 5) |
| **Interface** | UVC (`uvcvideo`, `/dev/video0`) + UAC microphone (ALSA card `U1080P`, 48 kHz stereo). In-tree drivers, no setup |
| **Formats** | MJPEG up to 1920×1080 at 60 fps nominal; YUYV only at low rates (5 fps at 1080p). **No H.264** |
| **Documentation** | None beyond the seller's listing; facts from the device: [USB camera report](impl/reports/USB-CAMERA.md) |
### Notes
- Delivered frame rate follows the light: 17–20 fps indoors with auto exposure, full rate with a short fixed exposure.
- MJPEG is ~245 KB per 1080p frame, ~7.3 MB/s at 30 fps; too much for the tablet link (~5 MB/s) or for recording. The Orin Nano has
**no hardware video encoder**; software H.264 (`x264enc` ultrafast) costs ~1.3 cores at 19 fps, ~2 at 30.
- Shares the carrier board's internal USB 2.0 hub with the SIM7600; headroom is ample.
- UVC controls (exposure, white balance, power-line frequency) reset on re-enumeration; set them when opening the device.
## RTC backup battery
**Status: optional, low priority.** Battery choice settled (CR2032); footprint/R560 still to verify against NVIDIA's schematic.