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전자부품 데이터시트 검색엔진 |
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전자부품 데이터시트 검색엔진 |
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MPR121QR2 데이터시트(PDF) 22 Page - Freescale Semiconductor, Inc |
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MPR121QR2 데이터시트(HTML) 22 Page - Freescale Semiconductor, Inc |
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22 / 57 page  MPR121 Sensors 22 Freescale Semiconductor AN3890: MPR121 Capacitance Sensing — Filtering and Timing INTRODUCTION The capacitance sensing front end of the MPR121 produces data at extremely high rates, which significantly improves the capabilities of a filtering system. The capacitance engine described in AN3889 act on a 1 μs - 32 μs per sample data rate. THis application note will discuss the first and second level filters in the MPR121 and how they impact timing and power consumption. Figure 18. Data Flow in the MPR121 The first level filter is configured through the use of the First Filter Iterations (FFI) and the Charge Discharge Time (CDT). AFE CONFIGURATION REGISTER The AFE Configuration Register is used to set both the CDC and the number of samples taken in the lowest level filter. The address of the AFE Configuration Register is 0x5C. Figure 19. AFE Configuration Register 7 6 543210 R FFI CDC W Reset: 0 0 000000 = Unimplemented AFE AQUISITION RAW DATA 2nd FILTER 1st FILTER BASELINE FILTER STATUS REGISTER IRQ TOUCH 1 - 32 μs 1 - 128 μs 4 - 2048 μs |
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