Datenblatt-Suchmaschine für elektronische Bauteile |
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ADXL312 Datenblatt(PDF) 11 Page - Analog Devices |
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ADXL312 Datenblatt(HTML) 11 Page - Analog Devices |
11 / 32 page ADXL312 Rev. 0 | Page 11 of 32 Table 6. Current Consumption vs. Data Rate (TA = 25°C, VS = VDD I/O = 3.3 V) Output Data Rate (Hz) Bandwidth (Hz) Rate Code IDD (μA) 3200 1600 1111 170 1600 800 1110 115 800 400 1101 170 400 200 1100 170 200 100 1011 170 100 50 1010 170 50 25 1001 115 25 12.5 1000 82 12.5 6.25 0111 65 6.25 3.125 0110 57 Table 7. Current Draw vs. Data Rate, Low Power Mode (TA = 25°C, VS = VDD I/O = 3.3 V) Output Data Rate (Hz) Bandwidth (Hz) Rate Code IDD (μA) 400 200 1100 115 200 100 1011 82 100 50 1010 65 50 25 1001 57 25 12.5 1000 50 12.5 6.25 0111 43 Autosleep Mode Additional power savings can be had by having the ADXL312 automatically switch to sleep mode during periods of inactivity. To enable this feature, set the THRESH_INACT register (Address 0x25) to an acceleration threshold value. Levels of acceleration below this threshold are regarded as no activity levels. Set TIME_INACT (Address 0x26) to an appropriate inactivity time period. Then set the AUTO_SLEEP bit and the link bit in the POWER_CTL register (Address 0x2D). If the device does not detect a level of acceleration in excess of THRES_INACT for TIME_INACT seconds, then the device is transitioned to sleep mode automatically. Current consumption at the sub-8 Hz data rates used in this mode is typically 30 μA for a VS of 3.3 V. Standby Mode For even lower power operation, standby mode can be used. In standby mode, current consumption is reduced to 0.1μA (typical). In this mode, no measurements are made. Standby mode is entered by clearing the measure bit (Bit 3) in the POWER_CTL register (Address 0x2D). Placing the device into standby mode preserves the contents of the FIFO. |
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