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ADXL212 数据表(PDF) 11 Page - Analog Devices |
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ADXL212 数据表(HTML) 11 Page - Analog Devices |
11 / 12 page ADXL212 Rev. 0 | Page 11 of 12 USING THE ADXL212 WITH OPERATING VOLTAGES OTHER THAN 5 V The ADXL212 is tested and specified at VS = 5 V; however, it can be powered with VS as low as 3 V or as high as 5.25 V. Some performance parameters change as the supply voltage varies. The ADXL212 sensitivity varies proportionally to supply voltage. At VS = 3 V, the sensitivity is typically 7.5%/g. The zero g bias output is ratiometric to supply voltage; therefore, the zero g output is nominally equal to 50% at all supply voltages. Self test response in g is roughly proportional to the square of the supply voltage. Therefore, at VS = 3 V, the self test response is equivalent to approximately 270 mg (typical), or 6%. The supply current decreases as the supply voltage decreases. Typical current consumption at VDD = 3 V is 450 μA. USING THE ADXL212 AS A DUAL AXIS TILT SENSOR A common application of the ADXL212 is tilt measurement. An accelerometer uses the force of gravity as an input vector to deter- mine its orientation in space. An accelerometer is most sensitive to tilt when its sensitive axis is perpendicular to the force of gravity, that is, parallel to the surface of the earth. At this orientation, its response to changes in tilt is highest: its output changes nearly 17.5 mg per degree of tilt. When the accelerometer is oriented on axis to gravity, that is, near its +1 g or –1 g reading, the change in output acceleration per degree of tilt is negligible. At 45°, its output changes by 12.2 mg per degree. Dual Axis Tilt Sensor: Converting Acceleration to Tilt When the accelerometer is oriented with both its x-axis and y-axis parallel to the surface of the earth (reading approximately 0 g), it can be used as a dual axis tilt sensor with a roll axis and a pitch axis. The output tilt in degrees is calculated as follows: Pitch = ASIN(AX/1 g) Roll = ASIN(AY/1 g) where AX and AY are accelerations in g, ranging from −1 g to +1 g. Be sure to account for overranges. It is possible for the accelerometers to output a signal greater than ±1 g due to vibration, shock, or other accelerations. |
类似零件编号 - ADXL212 |
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类似说明 - ADXL212 |
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