mikkeli
9e5e41f071
The dev kit carrier has pads but no connector populated, so the RTC resets whenever power is removed. Captures the connector part NVIDIA's docs reportedly specify, the community substitute, and the R560 note; battery type and footprint still need checking against the schematic. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
74 lines
3.9 KiB
Markdown
74 lines
3.9 KiB
Markdown
---
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type: reference
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---
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# Bill of Materials
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## PEAK-System PCAN-USB
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| Field | Value |
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|-------|-------|
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| **Manufacturer** | PEAK-System Technik GmbH |
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| **Model** | PCAN-USB |
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| **USB ID** | `0c72:000c` |
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| **Purpose** | USB-to-CAN adapter for reading car CAN bus traffic |
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| **Interface** | SocketCAN netdev |
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| **Default bitrate** | 500 kbps |
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| **Driver** | PEAK proprietary driver 9.2.0 (netdev build) — out-of-tree module, must be rebuilt after kernel updates |
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### Notes
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- The mainline kernel driver `peak_usb` is not compiled into the NVIDIA Tegra kernel (JetPack r36.4), so PEAK's proprietary driver is required.
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- Must be built with `NET=NETDEV_SUPPORT` for standard SocketCAN tools (`candump`, `ip link`, etc.).
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- The module lives at `/lib/modules/$(uname -r)/misc/pcan.ko` and is loaded via `modprobe pcan`.
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- Jetson Orin Nano has a built-in CAN controller (exposed by GPIO pins). Kernel `canN` order is not stable, so both are pinned by udev: onboard → `can_onboard`, PCAN-USB → `can_pcan` ([device naming](impl/reports/DEVICE-NAMING.md)).
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## Waveshare SIM7600G-H-M.2
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[hat](https://www.waveshare.com/wiki/SIM7600G-H-M2_4G_HAT) [module](https://www.waveshare.com/wiki/SIM7600G-H-M.2)
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| Field | Value |
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|-------|-------|
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| **Manufacturer** | Waveshare (SIMCom SIM7600G-H-M.2 module) |
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| **Form factor** | M.2 B KEY |
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| **Purpose** | LTE Cat 4 cellular + multi-constellation GNSS (GPS, Beidou, GLONASS, GALILEO, QZSS) |
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| **Interface** | USB (ttyUSB* for AT commands/NMEA, QMI `cdc-wdm0` + `wwan0` for data) |
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| **Power** | 3V – 4.2V (board rail) |
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| **Antennas** | 3× IPEX (LTE main + LTE diversity + GNSS) |
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| **Max data rate** | 150 Mbps DL / 50 Mbps UL (LTE Cat 4) |
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### Required software
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| Package | Purpose |
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|---------|---------|
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| `gpsd` | Decode NMEA from the GNSS ttyUSB port |
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| `ModemManager` + `NetworkManager` | Manage the modem and the LTE data connection (QMI) |
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| `qmi_wwan` + `cdc-wdm` kernel modules | Not in the Tegra kernel; built out of tree in `~/infra/qmi_wwan/` |
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| `minicom` (or `picocom`) | AT command terminal for module configuration |
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### Notes
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- The module presents multiple USB serial ports (`/dev/ttyUSB0`–`/dev/ttyUSB4`) — ttyUSB2/3 for AT commands, ttyUSB1 for NMEA GPS data (symlinked as `/dev/sim7600-gps`).
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- Default USB composition (PID 9001) is used with QMI; no PID switch needed. PPP dial-up does not work with the povo SIM (network detaches).
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- Setup details: [SIM7600 setup report](impl/reports/SIM7600-SETUP.md).
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- M.2 B KEY is **not** mechanically compatible with Mini-PCIe.
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- Supply voltage should be ~4.0 V for reliable operation.
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- DO NOT hot-plug while powered.
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## RTC backup battery
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**Status: research pending.** Part choice and footprint not yet verified against NVIDIA's schematic.
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| Field | Value |
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|-------|-------|
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| **Purpose** | Keep the RTC (`rtc0`, `nvvrs-pseq-rtc`) running while the board is unpowered, so the clock is correct at boot without network or GPS |
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| **Carrier board** | P3768 (Orin Nano Developer Kit): pads present, **connector not populated** (needs soldering) |
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| **Connector (per NVIDIA docs, as quoted on the forum)** | Wieson AC2651-0011-003-HH, 2-pin, 1.25 mm pitch. A community-used substitute is Molex 53398-0271 header + 51021-0200 housing |
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| **Battery** | TBD: coin cell with leads; confirm chemistry/voltage against the carrier board spec (SP-11324-001) |
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| **Extra parts** | Forum reports also populating R560 (0.56 Ω, e.g. Panasonic ERJ2BQFR56X); confirm in the P3768 schematic |
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### Notes
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- Without it the clock boots at a stale date (seen 2026-10-08: June 4) until NTP syncs. See the [time sync report](impl/reports/TIME-SYNC.md).
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- Forum sources: [RTC battery on Orin Nano DevKit](https://forums.developer.nvidia.com/t/rtc-battery-on-jetson-orin-nano-developer-kit/296732), [How to add RTC battery](https://forums.developer.nvidia.com/t/how-to-add-rtc-battery-in-jetson-orin-nano/255792).
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- A reported side effect: the battery lead and socket make the case cover sit unevenly.
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