Hi, the configuration for the 9-axis sensor used in Thingy is interesting where a switch is used to cut the power line from the sensor. From the description: 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.
How much current would the signal lines MPU_INT, SDA and SCL draw when the sensor is not in use and assuming only the power line is cut, i.e. while the signal lines are still connected?
I am planing to implement a switch, although the planned connection with the BT chip is SPI. For my design, size and power consumption are of big importance. The NX3DV2567 used in Thingy is a four-pole double-throw analog switch. Maybe in the case of SPI, I can live with a smaller one-pole double-throw or (single load switch) for the power supply?
Note: I am 99% sure the answer for SPI power consumption can be found somewhere. So please answer this fully only if you are friendly excited to provide a quick answer, perhaps in case you have experienced the same situation and willing to share your finding on Devzone. Otherwise google is there. Many thanks!
Edit:
