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LSM330D 데이터시트(PDF) 20 Page - STMicroelectronics |
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LSM330D 데이터시트(HTML) 20 Page - STMicroelectronics |
20 / 66 page Functionality LSM330D 20/66 Doc ID 022562 Rev 2 4 Functionality The LSM330D is a system-in-package featuring a 3D digital accelerometer and a 3D digital gyroscope. The device includes specific sensing elements and two IC interfaces capable to measuring both the acceleration and angular rate applied to the module and to provide a signal to external applications through an SPI/I2C serial interface. The various sensing elements are manufactured using specialized micromachining processes, while the IC interfaces are developed using a CMOS technology that allows the design of a dedicated circuit which is trimmed to better match the sensing element characteristics. The LSM330D may also be configured to generate an inertial wakeup and free-fall interrupt signal according to a programmed acceleration event along the enabled axes. 4.1 Accelerometer 4.1.1 Normal mode, Low power mode The accelerometer sensor inside the LSM330D inertial module provides two different operating modes: Normal mode and Low power mode. Normal mode guarantees high resolution, while Low power mode further reduces current consumption. The table below summarizes how to select the operating mode and the corresponding characteristics. 4.1.2 Self-test Self-test allows the checking of sensor functionality without moving it. The self-test function is off when the self-test bit (ST) is programmed to ‘0’. When the self-test bit is programmed to ‘1’ an actuation force is applied to the sensor, simulating a definite input acceleration. In this case, the sensor outputs exhibit a change in their DC levels which are related to the selected full scale through the device sensitivity. When self-test is activated, the device output level is given by the algebraic sum of the signals produced by the acceleration acting on the sensor and by the electrostatic test-force. If the output signals change within the amplitude specified in Table 3, then the sensor is working properly and the parameters of the interface chip are within the defined specifications. Table 9. Operating mode selection Operating mode CTRL_REG1[3] (LPen bit) CTRL_REG4[3] (HR bit) BW [Hz] Turn-on time [ms] Low power mode (8-bit) 1 0 ODR/2 1 Normal mode (12-bit) 0 1 ODR/9 7/ODR(kHz) |
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