The LSM6DSOWTR is a motion sensor module manufactured by STMicroelectronics, specifically a 6-axis MEMS (Micro-Electro-Mechanical Systems) sensor. It includes a 3-axis gyroscope and a 3-axis accelerometer.
Here’s a comprehensive breakdown of its specifications, pin functions, and circuit instructions, along with FAQ in the requested format:
1. LSM6DSOWTR Pin Function and Specification:
The LSM6DSOWTR sensor is typically housed in a LGA-24 package, which has 24 pins. Below is the pinout and function description of all the 24 pins:
Pin Name Function Description 1 VDDIO Power supply for I/O (2.4V to 3.6V) 2 VDD Power supply (1.8V to 3.6V) 3 SCL I2C Clock input (Serial Clock) 4 SDA I2C Data input/output (Serial Data) 5 CS Chip Select for SPI (Active low) 6 SDI SPI Data input (MOSI) 7 SDO SPI Data output (MISO) 8 INT1 Interrupt 1 output (user-configurable) 9 INT2 Interrupt 2 output (user-configurable) 10 NC No connection 11 GND Ground 12 ODR Output Data Rate selection input 13 RST Reset (active low, reset the chip) 14 SDAO Output of the I2C (Open-drain) 15 3.3V Power supply (3.3V for the sensor) 16 VSSA Analog ground (for accelerometer and gyroscope) 17 VSS Ground pin (Common ground for analog and digital) 18 VDDIO2 Power supply for auxiliary I2C/SPI interface 19 VDD33 Supply voltage pin for analog section 20 ODR_CTRL Output Data Rate control signal 21 PD Power-down control (active high to power down sensor) 22 VDD2 Power supply for auxiliary interface 23 GND2 Ground pin for auxiliary interface 24 REFERENCE Reference voltage (for internal circuits)2. LSM6DSOWTR Package Details:
The LSM6DSOWTR comes in a LGA-24 package. The LGA (Land Grid Array) package features 24 leads that connect to the PCB through a grid of pads on the underside of the package.
3. Functional Description of Each Pin:
Here’s a detailed explanation of each pin function in the LGA-24 package:
VDD (Pin 2): The main power supply for the sensor, supporting voltages from 1.8V to 3.6V. VDDIO (Pin 1): The power supply for I/O voltage, ranging from 2.4V to 3.6V. SCL (Pin 3) and SDA (Pin 4): These are the serial clock and data lines for I2C communication, respectively. SCL provides the clock pulse, while SDA carries the data. CS (Pin 5): The chip select pin for SPI communication, active low. SDI (Pin 6): Data input pin for SPI, also referred to as MOSI (Master Out Slave In). SDO (Pin 7): Data output pin for SPI, also known as MISO (Master In Slave Out). INT1 (Pin 8) and INT2 (Pin 9): Interrupt outputs for external applications. These signals notify the user of certain conditions in the sensor, such as motion detection or error states. NC (Pin 10): This pin is unused and has no electrical connection. GND (Pin 11): The ground pin. ODR (Pin 12): A pin for selecting the output data rate for the sensor. RST (Pin 13): The reset pin for the sensor; when low, it will reset the chip. SDAO (Pin 14): Open-drain output pin for I2C data line. 3.3V (Pin 15): Power supply pin for the 3.3V voltage regulator. VSSA (Pin 16): The analog ground pin for the accelerometer and gyroscope circuits. VSS (Pin 17): The common ground for both analog and digital circuits of the sensor. VDDIO2 (Pin 18): Auxiliary power supply for secondary I2C/SPI interfaces. VDD33 (Pin 19): Supply voltage pin for the analog section of the sensor. ODR_CTRL (Pin 20): Control pin for configuring the output data rate. PD (Pin 21): The power-down control pin; when activated, it shuts down the sensor to conserve power. VDD2 (Pin 22): Power supply pin for the auxiliary interface (I2C/SPI). GND2 (Pin 23): Ground pin for the auxiliary interface. REFERENCE (Pin 24): Reference voltage input for internal use.4. LSM6DSOWTR FAQ:
Q1: What is the supply voltage for the LSM6DSOWTR sensor?A1: The LSM6DSOWTR operates with a supply voltage between 1.8V and 3.6V.
Q2: How do I connect the sensor to my microcontroller?A2: You can connect the LSM6DSOWTR to a microcontroller using either I2C (pins SCL and SDA) or SPI (pins CS, SDI, and SDO) communication protocols.
Q3: What is the output data rate for the LSM6DSOWTR?A3: The LSM6DSOWTR allows you to configure the output data rate using the ODR pin or through I2C/SPI commands.
Q4: How can I reset the LSM6DSOWTR?A4: To reset the sensor, pull the RST pin low for at least one clock cycle.
Q5: What is the function of the INT1 and INT2 pins?A5: These pins serve as interrupt outputs, indicating specific conditions or events, like motion detection or sensor errors.
Q6: Can I use the LSM6DSOWTR in a low-power application?A6: Yes, you can put the sensor into low power mode by setting the PD pin high to enter power-down mode.
Q7: What is the package size of the LSM6DSOWTR?A7: The LSM6DSOWTR is available in a LGA-24 package.
Q8: Can I use the LSM6DSOWTR with both I2C and SPI?A8: Yes, the LSM6DSOWTR supports both I2C and SPI communication protocols, and the user can select the interface via the CS pin for SPI.
Q9: What is the voltage range for the I/O pins on the LSM6DSOWTR?A9: The I/O voltage range is 2.4V to 3.6V, and the main supply voltage is 1.8V to 3.6V.
Q10: How do I configure the ODR (Output Data Rate)?A10: The ODR can be configured by setting the ODR_CTRL pin or via I2C/SPI commands to set the data rate for accelerometer and gyroscope outputs.
Q11: What is the purpose of the REFERENCE pin?A11: The REFERENCE pin provides a reference voltage for internal use in the sensor's circuits.
Q12: What is the meaning of the NC pin?A12: The NC pin is not connected and can be ignored during PCB design.
Q13: Can I use LSM6DSOWTR for both accelerometer and gyroscope applications?A13: Yes, the LSM6DSOWTR integrates both 3-axis accelerometer and 3-axis gyroscope, making it suitable for motion sensing applications.
Q14: How do I enable interrupts on the LSM6DSOWTR?A14: The interrupts are enabled via configuration registers that are accessed through I2C/SPI, and they are outputted on INT1 and INT2 pins.
Q15: Is the LSM6DSOWTR sensitive to temperature?A15: Yes, the LSM6DSOWTR has built-in temperature compensation, but extreme environmental conditions may still affect its performance.
Q16: How do I power down the LSM6DSOWTR to save energy?A16: Power-down mode is activated by setting the PD pin high, which reduces the sensor's power consumption significantly.
Q17: What does the VDDIO2 pin supply?A17: The VDDIO2 pin provides power to the auxiliary interface, such as an additional SPI or I2C interface.
Q18: How accurate is the LSM6DSOWTR in motion sensing?A18: The LSM6DSOWTR offers high precision in detecting motion with a 3-axis accelerometer and a 3-axis gyroscope, suitable for a variety of industrial applications.
Q19: Can I use the LSM6DSOWTR for orientation sensing?A19: Yes, the combined accelerometer and gyroscope can be used for accurate orientation and angular velocity detection.
Q20: Is there a software library available for the LSM6DSOWTR?A20: Yes, STMicroelectronics provides libraries and drivers to interface with the LSM6DSOWTR via I2C or SPI.
This detailed guide provides the specifications, functions, and configuration details for the LSM6DSOWTR along with answers to the most frequently asked questions.