Sensors - Qualcomm Dragonwing Documentation

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. To use the temperature sensor with lm-sensors:

sudo apt-get install lm-sensors
sensors-detect
sensors

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`
Ubuntu tools show no data	Missing kernel modules	Enable sensor drivers in kernel config; rebuild BSP; confirm `/sys/class/hwmon`

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​Hardware Interfaces

​Usage

​Troubleshooting

Hardware Interfaces

Usage

Troubleshooting