The Dragonwing IQ-8275 EVK includes an on-board IMU and a temperature sensor, both connected to the real-time subsystem (RTSS) domain.
Software support for the IMU and temperature sensors is not currently available.
| Reference Designator | Sensor Type | Protocol | MPN | Manufacturer |
|---|
| U97 | IMU sensor | I2C | ICM-42688 | TDK InvenSense |
| U109 | Temperature sensor | I2C (optional: SPI) | TMP411DQDGKRQ1 | Texas Instruments |
Hardware Interfaces
IMU (ICM-42688)
- I²C bus on SAIL domain for register access (no software support currently)
- Interrupt GPIO for data-ready signaling
Temperature Sensor (TMP411)
- I²C bus on main domain (shared with fan controller)
- Optional SPI interface for faster data reads
Additional I2C, SPI, and UART interfaces are available on the LS1 low-speed header for connecting external sensors.
Usage
IMU Sensor (ICM-42688) — Provides 6-axis motion data (accelerometer + gyroscope) for robotics, navigation, and sensor fusion. Ideal for real-time applications requiring low-latency motion feedback.
Temperature Sensor (TMP411) — Monitors board and ambient temperature for thermal management. Used by fan control logic for dynamic cooling.
Troubleshooting
| Issue | Possible Cause | Solution |
|---|
| IMU not detected on I²C | Incorrect device tree or bus number | Verify i2cdetect output; check DTS configuration; confirm power rails |
| IMU interrupt not firing | GPIO misconfiguration | Check DTS interrupt mapping; verify GPIO polarity; test with cat /proc/interrupts |
| Temperature sensor not reporting | Driver not loaded or bus conflict | Load tmp411 driver (modprobe tmp411); check fan controller sharing; confirm I²C address |
| Sensor read errors | Clock or power instability | Validate PMIC settings; check RTSS domain clocks; inspect dmesg |
