MPU9250: ID vs. Address Explained
The MPU9250 is a popular sensor integrating an accelerometer, gyroscope, and magnetometer. Its ID and address are distinct due to the use of different communication protocols and register mapping.
'ID' refers to the sensor's unique identifier, signifying its type and manufacturer. In the MPU9250, the ID is 0x71, accessible by reading a specific register.
'Address' designates the sensor's location on the I2C or SPI bus. For the MPU9250, the I2C address can be set to either 0x68 or 0x69, determined by the AD0 pin's state. Grounding AD0 results in an address of 0x68, while a high level on AD0 sets the address to 0x69. The SPI address is selected through the chip select pin.
Therefore, the MPU9250's ID and address serve distinct purposes. The ID identifies the sensor's type and manufacturer, while the address uniquely designates the sensor device on the communication bus.
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