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MPR121 数据表(PDF) 40 Page - Freescale Semiconductor, Inc |
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MPR121 数据表(HTML) 40 Page - Freescale Semiconductor, Inc |
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40 / 57 page  MPR121 Sensors 40 Freescale Semiconductor Eleprox Baseline Value Register (0x2A) contains the 8 MSBs of the 10-bit baseline value for the 13th Proximity Detection electrode. Writing to Baseline Value Register updates the 8 MSBs of baseline value and clears the 2 LSBs to zero. The Baseline Value Registers can only be written when in Shutdown Mode, but the current values may be read at any time. 3.0 Proximity Sensing Status Indication MPR121 provides a single proximity sensing status bit (ELE[12] in table below) in the Touch Status Register. This status bit changes as a result of internal detection algorithm using the proximity raw data with the proximity baseline value and proximity touch/release threshold setting. When ELE[12] is set, the proximity is deemed as detected, and undetected when ELE[12] is 0. The update rate of this status bit will be determined by sampling rate and detection debounce setting. The status bit will not immediately change if the Debounce Register is non zero. This Debounce Register is globally effective to prevent possible flick noise for both touch and proximity sensing. The value in the Debounce Register determines how many numbers of sample inter- vals are needed to pass at the touch/release threshold before the status bit is finally changed. On ELEPROX status bit change, the interrupt pin will be asserted. 4.0 Proximity Detection Touch/Release Threshold Similar to the touch/release threshold for touch detection, the proximity detection also has a pair of touch/release threshold setting registers. The programmable threshold setting range is 0~63 count, representing the delta change below the baseline value when touched or released. The Threshold should be set according to the system SNR requirement and also provide ade- quate headroom for mass production variation. For normal application, set Touch Threshold slightly larger than Release Thresh- old so that there is no flick detection. Example: Touch Threshold = 0x08, Release Threshold = 0x05. Table 36. Eleprox Baseline Value Register 0x2A (Reset Default: 0x00) 0x2A Bit7 Bit6 Bit5 Bit4 Bit3 Bit2 Bit1 Bit0 D9 D8 D7 D6 D5 D4 D3 D2 Table 37. Status Register 0x00, 0x01 (Reset Default: 0x00) 0x00 Bit7 Bit6 Bit5 Bit4 Bit3 Bit2 Bit1 Bit0 ELE[7] ELE[6] ELE[5] ELE[4] ELE[3] ELE[2] ELE[1] ELE[0] 0x01 Bit7 Bit6 Bit5 Bit4 Bit3 Bit2 Bit1 Bit0 OVCF 0 0 ELE[12] ELE[11] ELE[10] ELE[9] ELE[8] Table 38. Debounce Register 0x5B (Reset Default: 0x00) 0x5B Bit7 Bit6 Bit5 Bit4 Bit3 Bit2 Bit1 Bit0 X DR[2] DR[1] DR[0] X DT[2] DT[1] DT[0] Table 39. Eleprox Touch Threshold Register 0x59 (Reset Default: 0x00) 0x59 Bit7 Bit6 Bit5 Bit4 Bit3 Bit2 Bit1 Bit0 D7 D6 D5 D4 D3 D2 D1 D0 Table 40. Eleprox Release Threshold Register 0x5A (Reset Default: 0x00) 0x5A Bit7 Bit6 Bit5 Bit4 Bit3 Bit2 Bit1 Bit0 D7 D6 D5 D4 D3 D2 D1 D0 |
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