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ADXL375BCCZ Scheda tecnica(PDF) 10 Page - Analog Devices |
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ADXL375BCCZ Scheda tecnica(HTML) 10 Page - Analog Devices |
10 / 32 page ADXL375 Data Sheet Rev. 0 | Page 10 of 32 THEORY OF OPERATION The ADXL375 is a complete 3-axis acceleration measurement system with a measurement range of ±200 g. It measures both dynamic acceleration resulting from motion or shock and static acceleration, such as gravity. The sensor is a polysilicon surface-micromachined structure built on top of a silicon wafer. Polysilicon springs suspend the structure over the surface of the wafer and provide resistance against forces due to applied acceleration. Deflection of the structure is measured using differential capac- itors that consist of independent fixed plates and plates attached to the moving mass. Acceleration deflects the proof mass 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. POWER SEQUENCING Power can be applied to VS or VDD I/O in any sequence without damaging the ADXL375. Table 7 provides a description of all the power modes. The interface voltage level is set using the interface supply voltage, VDDI/O, which must be present to ensure that the ADXL375 does not create a conflict on the communi- cation bus. For single-supply operation, VDD I/O can be the same as the main supply, VS. In a dual-supply application, however, VDD I/O can differ from VS to accommodate the desired interface voltage, as long as VS is greater than or equal to VDD I/O. After VS is applied, the device enters standby mode. In standby mode, power consumption is minimized; the device waits for VDDI/O to be applied and for the command to enter measurement mode. This command can be initiated by setting the measure bit (Bit D3) in the POWER_CTL register (Address 0x2D). When the device is in standby mode, any register can be written to or read from. It is recommended that the device be configured in standby mode before enabling measurement mode. Clearing the measure bit returns the device to standby mode. CURRENT CONSUMPTION AND OUTPUT DATA RATE The ADXL375 automatically modulates its current consumption in proportion to its output data rate (see Table 6). The device bandwidth and output data rate are specified using the rate bits (Bits[D3:D0]) in the BW_RATE register (Address 0x2C). Table 6. Typical Current Consumption vs. Data Rate (TA = 25°C, VS = 2.5 V, VDDI/O = 1.8 V) Rate Bits Output Data Rate (Hz) Bandwidth (Hz) IDD (µA) 1111 3200 1600 145 1110 1600 800 90 1101 800 400 140 1100 400 200 140 1011 200 100 140 1010 100 50 140 1001 50 25 90 1000 25 12.5 60 0111 12.5 6.25 50 0110 6.25 3.13 40 0101 3.13 1.56 35 0100 1.56 0.78 35 0011 0.78 0.39 35 0010 0.39 0.20 35 0001 0.20 0.10 35 0000 0.10 0.05 35 Table 7. Power Modes Power Mode VS VDD I/O Description Power Off Off Off The device is completely off, but it is still possible for the device to create a conflict on the communication bus. Bus Disabled On Off The device is on in standby mode, but communication is unavailable and the device can create a conflict on the communication bus. Minimize the duration of the bus disabled state during power-up to prevent a conflict on the communication bus. Bus Enabled Off On No functions are available, but the device does not create a conflict on the communication bus. Standby or Measurement On On At power-up, the device is in standby mode, awaiting a command to enter measurement mode, and all sensor functions are off. After the device is instructed to enter measurement mode, all sensor functions are available. |
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