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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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MPR121QR2 датащи(PDF) 26 Page - Freescale Semiconductor, Inc |
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MPR121QR2 датащи(HTML) 26 Page - Freescale Semiconductor, Inc |
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26 / 57 page  MPR121 Sensors 26 Freescale Semiconductor AN3891: MPR121 Baseline System INTRODUCTION Touch acquisition takes a few different parts of the system in order to detect touch. The baseline filter and touch detection are tightly coupled. The purpose of the baseline filter is to “filter out touches” resulting in a system that is similar to a long term average but also takes into account that one specific signature. A touch must have different properties than noise and environmental change with respect to the filter response. This is accomplished through four register types that operate under different conditions. These are Max Half Delta (MHD), Noise Half Delta (NHD), Noise Count Limit (NCL) and Filter Delay Limit (FDL). Figure 24. Data Flow in the MPR121 MAX HALF DELTA (NHD) 7 6 543210 R0 0 MHD W Reset: 0 0 000000 = Unimplemented Table 22. Max Half Delta Register Field Descriptions Field Description 5:0 MHD Max Half Delta – The Max Half Delta determines the largest magnitude of variation to pass through the third level filter. 000000 DO NOT USE THIS CODE 000001 Encoding 1 – Sets the Max Half Delta to 1 ~ 111111 Encoding 63 – Sets the Max Half Delta to 63 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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