For advanced motion tracking features, Thingy uses a three-axis gyro, three-axis accelerometer, and three-axis magnetometer integrated device (U3).
The motion sensor is interfaced through the I2C bus (0x68). To reduce power consumption when the motion sensor is not in use, the power supply and signal lines are connected through an analog switch (U4). This enables the device to be completely cut off from the rest of the circuit when not in use. When the motion sensor is not in use, the GPIO used for the interrupt signal can be accessed on test point TP1.
Figure 1. Motion sensor schematic
