Sensors - Qualcomm Dragonwing Documentation

The Dragonwing IQ-9075 EVK includes an on-board IMU and a temperature sensor, IMU sensor is connected real-time subsystem (RTSS) domain and temperature sensor is connected to MAIN 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`

​Hardware Interfaces

​Usage

​Troubleshooting

Hardware Interfaces

Usage

Troubleshooting