tailieunhanh - Nano - and Micro Eelectromechanical Systems - S.E. Lyshevski Part 9

Tham khảo tài liệu 'nano - and micro eelectromechanical systems - . lyshevski part 9', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | ADXL202 ADXL210 USING THE ANALOG OUTPUT The ADXL202 ADXL210 was specifically designed for use with its digital outputs but has provisions to provide analog outputs as well. Duty Cycle Filtering An analog output can be reconstructed by filtering the duty cycle output. This technique requires only passive components. The duty cycle period T2 should be set to 1 ms. An RC filter with a 3 dB point at least a factor of 10 less than the duty cycle frequency is connected to the duty cycle output. The filter resistor should be no less than 100 kO to prevent loading of the output stage. The analog output signal will be ratiometric to the supply voltage. The advantage of this method is an output scale factor of approximately double the analog output. Its disadvantage is that the frequency response will be lower than when using the XFILT YFILT output. XFILT YFILT Output The second method is to use the analog output present at the XFILT and Yfilt pin. Unfortunately these pins have a 32 kO output impedance and are not designed to drive a load directly. An op amp follower may be required to buffer this pin. The advantage of this method is that the full 5 kHz bandwidth of the accelerometer is available to the user. A capacitor still must be added at this point for filtering. The duty cycle converter should be kept running by using RSET 10 MO. Note that the accelerometer offset and sensitivity are ratiometric to the supply voltage. The offset and sensitivity are nominally 0 g Offset Vdd 2 V at 5 V aDxL202 Sensitivity 60 mV X VS g 300 mV g at 5 V VDD ADXL2l0 Sensitivity 20 mV X VS g 100 mV g at 5 V vDd USING THE ADXL202 ADXL210 IN VERY LOW POWER APPLICATIONS An application note outlining low power strategies for the ADXL202 ADXL210 is available. Some key points are presented here. It is possible to reduce the ADXL202 ADXL210 s average current from mA to less than 20 uA by using the following techniques 1. Power Cycle the accelerometer. 2. Run the accelerometer at a Lower .

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