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MPR121 数据表(PDF) 51 Page - Freescale Semiconductor, Inc |
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MPR121 数据表(HTML) 51 Page - Freescale Semiconductor, Inc |
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51 / 57 page  MPR121 Sensors Freescale Semiconductor 51 The following sections describe what each of the defaults do and recommendations for variations. Section A Section B 0x7D AUTO-CONFIG USL Register 0x9C AN3889 F 0x7E AUTO-CONFIG LSL Register 0x65 AN3889 F 0x7F AUTO-CONFIG Target Level Register 0x8C AN3889 F Register Address Register Name Value Application Note 0x2B MHD Rising 0x01 AN3891 0x2C NHD Amount Rising 0x01 AN3891 0x2D NCL Rising 0x00 AN3891 0x2E FDL Rising 0x00 AN3891 Description: This group of setting controls the filtering of the system when the data is greater than the baseline. The setting used allow the filter to act quickly and adjust for environmental changes. Additionally, if calibration happens to take place while a touch occurs, the value will self adjust very quickly. This auto-recovery or snap back prevents repeated false negative for a touch detection. Variation: As the filter is sensitive to setting changes, it is recommended that users read AN3891 before changing the values. In most cases these default values will work Register Address Register Name Value Application Note 0x2F MHD Falling 0x01 AN3891 0x30 NHD Amount Falling 0x01 AN3891 0x31 NCL Falling 0xFF AN3891 0x32 FDL Falling 0x02 AN3891 Description: This group of setting controls the filtering of the system, when the data is less than the baseline. The settings slow down the filter as the negative charge is in the same direction as a touch. By slowing down the filter, touch signals are “rejected” by the baseline filter. While at the same time lon term environmental change that occur slower than at a touch are accepted. This low pass filter both allows for touches to be detected properly while preventing false positive by passing environmental change through the filter. Variation: As the filter is sensitive to setting changes, it is recommended that users read AN3891 before changing the values. In most cases these default values will work Register Address Register Name Value Application Note Section |
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