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H3LIS100DL Fiches technique(PDF) 14 Page - STMicroelectronics |
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H3LIS100DL Fiches technique(HTML) 14 Page - STMicroelectronics |
14 / 38 page Mechanical and electrical specifications H3LIS100DL 14/38 DocID027504 Rev 2 2.5 Terminology 2.5.1 Sensitivity Sensitivity describes the gain of the sensor and can be determined by applying 1 g acceleration to it. As the sensor can measure DC accelerations this can be done easily by pointing the axis of interest towards the center of the Earth, noting the output value, rotating the sensor by 180 degrees (pointing to the sky) and noting the output value again. By doing so, ±1 g acceleration is applied to the sensor. Subtracting the larger output value from the smaller one, and dividing the result by 2, leads to the actual sensitivity of the sensor. This value changes very little over temperature and time. The sensitivity tolerance describes the range of sensitivities of a large population of sensors. 2.5.2 Zero-g level The zero-g level offset (TyOff) describes the deviation of an actual output signal from the ideal output signal if no acceleration is present. A sensor in a steady-state on a horizontal surface measures 0 g for the X-axis and 0 g for the Y-axis whereas the Z-axis measures 1 g. The output is ideally in the middle of the dynamic range of the sensor (content of OUT registers 00h, data expressed as two’s complement number). A deviation from the ideal value in this case is called zero-g offset. Offset is, to some extent, a result of stress to the MEMS sensor and therefore can slightly change after mounting the sensor onto a printed circuit board or exposing it to extensive mechanical stress. Offset changes little over temperature, refer to “Zero-g level change vs. temperature” (see TCOff in Table 3). The zero-g level tolerance (TyOff) describes the standard deviation of the range of zero-g levels of a population of sensors. 2.5.3 Sleep-to-wakeup The “sleep-to-wakeup” function, in conjunction with low-power mode, allows further reducing the system power consumption and develop new smart applications. The H3LIS100DL may be set in a low-power operating mode, characterized by lower data rate refreshes. In this way the device, even if sleeping, continues to sense acceleration and generate interrupt requests. When the “sleep-to-wakeup” function is activated, the H3LIS100DL is able to automatically wake up as soon as the interrupt event has been detected, increasing the output data rate and bandwidth. With this feature the system may be efficiently switched from low-power mode to full performance, depending on user-selectable positioning and acceleration events, therefore ensuring power saving and flexibility. |
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