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AN3308 Datasheet(PDF) 16 Page - STMicroelectronics |
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AN3308 Datasheet(HTML) 16 Page - STMicroelectronics |
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16 / 52 page ![]() High-pass filter AN3308 16/52 Doc ID 18198 Rev 1 4.1.1 Normal mode In this configuration the high-pass filter can be reset reading the reference register, instantly deleting the DC component of the acceleration. Figure 3. HP_FILTER_RESET readings 4.1.2 Reference mode In this configuration the output data is calculated as the difference between the input acceleration and the content of the reference register. This register is in 2’ complement representation and the value of 1 LSB of these 7-bit registers depends on the selected full scale (Table 9). Table 8. Low power mode - high-pass filter cut-off frequency [Hz] HPC ft [Hz] @ 1Hz ft [Hz] @ 10Hz ft [Hz] @ 25Hz ft [Hz] @ 50Hz ft [Hz] @ 100Hz ft [Hz] @ 200Hz ft [Hz] @ 400Hz ft [Hz] @ 1.6 kHz ft [Hz] @ 5 kHz 00 0.02 0.2 0.5 1 2 4 8 32 100 01 0.008 0.08 0.2 0.5 1 2 4 16 50 10 0.004 0.04 0.1 0.2 0.5 1 2 8 25 11 0.002 0.02 0.05 0.1 0.2 0.5 1 4 12 Table 9. Reference mode LSB value Full scale Reference mode LSB value (mg) 2~16 4~31 8~63 |
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