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ADXL362 Datasheet(PDF) 8 Page - Analog Devices |
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ADXL362 Datasheet(HTML) 8 Page - Analog Devices |
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8 / 40 page  ADXL362 Preliminary Technical Data Rev. PrB | Page 8 of 40 FUNCTIONAL DESCRIPTION The ADXL362 is a complete three-axis acceleration measurement system that operates at extremely low power consumption levels and enables system-level power savings. It measures both dynamic acceleration resulting from motion or shock and static acceleration, such as tilt. Acceleration is reported digitally and the device communicates via the SPI protocol. MECHANICAL DEVICE OPERATION The moving component of the sensor is a polysilicon surface- micromachined structure, also referred to as a beam, built on top of a silicon wafer. Polysilicon springs suspend the structure over the surface of the wafer and provide a resistance against acceleration forces. Deflection of the structure is measured using differential capacitors that consist of independent fixed plates and plates attached to the moving mass. Acceleration deflects the beam and unbalances the differential capacitor, resulting in a sensor output whose amplitude is proportional to acceleration. Phase- sensitive demodulation is used to determine the magnitude and polarity of the acceleration. OPERATING MODES The ADXL362 has two operating modes: Measurement Mode for continuous, wide-bandwidth sensing, and Wake-up Mode for limited-bandwidth activity detection. Measurement can be suspended altogether by placing the device in Standby. Measurement Mode Measurement Mode is the normal operating mode of the ADXL362. In this mode, acceleration data is read continuously and the accelerometer consumes less than 3 µA (typical) across its entire range of output data rates up to 400 Hz, with a 2.0V supply. All features described in this datasheet are available when operating in this mode. The ability to continuously output data from the minimum 12.5Hz to the maximum 400Hz data rate without aliasing any input signal while also still delivering less than 3 µA (typical) of current consumption is what makes the ADXL362 truly a breakthrough ultra-low power accelerometer. Other accelerometers derive low current by using a specific low power mode that power cycles acceleration sensing. This leads to a small effective bandwidth in the low-power modes and undersampling of input data and thus unwanted aliasing can occur. Undersampling and aliasing will not happen with the ADXL362 since it continuously samples the full bandwidth of its sensor at all data rates. Wake-up Mode Wake-Up Mode is ideal for simple detection of the presence or absence of motion, at extremely low power consumption (300 nA at a 2.0V supply voltage). This mode is useful particularly for implementation of a motion-activated on/off switch, allowing the rest of the system to be powered down until activity is detected. Wake-up Mode reduces current consumption to a very low level by measuring acceleration only about six times per second to determine whether motion is present. If motion is detected, the accelerometer can respond autonomously in several ways: it can switch into full-bandwidth measurement mode, signal an interrupt to a microcontroller, and/or wake up downstream circuitry, depending on configuration. Standby Placing the ADXL362 in Standby suspends measurement and reduces current consumption to merely 10nA (typical). Pending interrupts and data are preserved. No new interrupts are generated. The ADXL362 powers up in Standby with all sensor functions off. POWER/NOISE TRADEOFF The ADXL362 offers a few options for decreasing noise at the expense of only a small increase in current consumption. The noise performance of the ADXL362 in normal operation, typically 7 LSB RMS at 100 Hz bandwidth, will be adequate for most applications, depending upon bandwidth and the desired resolution. For cases where lower noise is needed, the ADXL362 provides two lower-noise operating modes that trade reduced noise for somewhat higher supply current. Table 6 shows the supply current values and noise densities obtained for normal operation and the two lower-noise modes, at a typical 2.0V supply. Operating the ADXL362 at a higher supply voltage also decreases noise. Table 7 shows the supply current values and noise densities obtained for normal operation and the two lower-noise modes the highest recommended supply, 3.3V. |
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