The MPU-9250 is a product from InvenSense, which is a well-known brand specializing in MEMS (Micro-Electro-Mechanical Systems) sensors, particularly motion tracking and sensing devices. The MPU-9250 is a 9-axis motion tracking device, featuring a combination of a 3-axis gyroscope, 3-axis accelerometer, and 3-axis magnetometer. It is commonly used in applications such as drones, robotics, and wearables, providing accurate orientation and movement tracking.
The MPU-9250 is housed in a QFN (Quad Flat No-lead) package with 24 pins. Here’s a detailed explanation of its pins and their functions, including a table format listing each pin’s function. Please note that there are only 24 pins in the package, not 200, as you might have thought.
MPU-9250 Pinout and Pin Functions
Pin Number Pin Name Function Description 1 VDD Power supply pin for the device (3.3V). 2 GND Ground pin for the device. 3 VDDIO I/O voltage supply (1.8V or 3.3V). 4 SCL Serial clock line for I2C communication (high-speed clock input). 5 SDA Serial data line for I2C communication (data exchange). 6 INT Interrupt output pin for signaling the host processor. 7 FSYNC Frame sync input (used for synchronization). 8 AD0 I2C address select pin (used to configure the I2C address). 9 XDA Auxiliary I2C data line (used for external sensor communication). 10 XCL Auxiliary I2C clock line (used for external sensor communication). 11 INT2 Second interrupt output pin. 12 ADO I2C address bit for selecting between two different addresses. 13 RESET Reset pin for the device (active low). 14 AUX_VDD Auxiliary voltage pin for external sensors (3.3V). 15 VDD Main voltage supply (3.3V). 16 SDA2 Secondary I2C data line for auxiliary sensors. 17 SCL2 Secondary I2C clock line for auxiliary sensors. 18 VCC Power supply for auxiliary sensors. 19 GND Ground for auxiliary sensors. 20 NC No connection pin (should be left floating). 21 NC No connection pin (should be left floating). 22 NC No connection pin (should be left floating). 23 NC No connection pin (should be left floating). 24 NC No connection pin (should be left floating).FAQ for MPU-9250
Q: What is the main function of the MPU-9250? A: The MPU-9250 is a 9-axis motion tracking sensor that combines a 3-axis gyroscope, 3-axis accelerometer, and 3-axis magnetometer for accurate motion and orientation sensing.
Q: How do I communicate with the MPU-9250? A: The MPU-9250 can communicate through I2C or SPI protocols, with pins SCL and SDA used for I2C communication.
Q: What is the recommended operating voltage for the MPU-9250? A: The MPU-9250 operates at 3.3V for the main power supply (VDD) and 1.8V or 3.3V for the I/O voltage supply (VDDIO).
Q: What does the INT pin on the MPU-9250 do? A: The INT pin is used for interrupt signals to the host processor, indicating events like data ready or sensor state changes.
Q: What is the purpose of the FSYNC pin on the MPU-9250? A: The FSYNC pin is used to synchronize the sensor data output with an external device.
Q: Can the MPU-9250 work with external sensors? A: Yes, the MPU-9250 has auxiliary I2C connections (XDA, XCL) to communicate with external sensors.
Q: What is the purpose of the AD0 pin? A: The AD0 pin is used to select the I2C address of the MPU-9250. It allows for two possible I2C addresses (0x68 or 0x69).
Q: How can I reset the MPU-9250? A: You can reset the MPU-9250 by pulling the RESET pin low.
Q: What are the common applications for the MPU-9250? A: The MPU-9250 is commonly used in drones, robotics, wearables, and virtual reality devices for motion tracking.
Q: What is the power consumption of the MPU-9250? A: The power consumption varies depending on the operating mode, but typically it is around 3.6 mA in normal operation.
Q: How do I power the MPU-9250? A: You can power the MPU-9250 using a 3.3V supply connected to the VDD pin.
Q: Is the MPU-9250 compatible with both 1.8V and 3.3V logic? A: Yes, the MPU-9250 supports both 1.8V and 3.3V logic levels for I2C communication through the VDDIO pin.
Q: Can the MPU-9250 be used for altitude sensing? A: The MPU-9250 does not have a barometer, so it cannot directly measure altitude. However, it can be used in conjunction with other sensors for altitude-related applications.
Q: What is the maximum sampling rate for the accelerometer in the MPU-9250? A: The maximum sampling rate for the accelerometer is 1 kHz.
Q: How accurate is the gyroscope in the MPU-9250? A: The gyroscope in the MPU-9250 has a typical accuracy of ±250, ±500, ±1000, or ±2000 degrees per second (dps), depending on the selected range.
Q: What is the sensitivity of the accelerometer in the MPU-9250? A: The accelerometer sensitivity is 16384 counts per g for a ±2g range.
Q: Does the MPU-9250 have a magnetometer? A: Yes, the MPU-9250 includes a 3-axis magnetometer for sensing magnetic fields, which is used for orientation and heading calculations.
Q: Can the MPU-9250 be used in low-power applications? A: Yes, the MPU-9250 has low-power modes, and the power consumption can be reduced by adjusting the sampling rates and turning off unused sensors.
Q: What is the temperature range for the MPU-9250? A: The operating temperature range for the MPU-9250 is -40°C to +85°C.
Q: How do I interface the MPU-9250 with a microcontroller? A: You can interface the MPU-9250 with a microcontroller using I2C or SPI communication. Connect the corresponding SCL and SDA (or MISO, MOSI, SCK for SPI) pins to the microcontroller and use appropriate libraries for communication.
This detailed explanation provides a full list of the pins, their functions, and answers common questions about the MPU-9250.