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Datenblatt-Suchmaschine für elektronische Bauteile |
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Datenblatt-Suchmaschine für elektronische Bauteile |
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MPR121 Datenblatt(PDF) 52 Page - Freescale Semiconductor, Inc |
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MPR121 Datenblatt(HTML) 52 Page - Freescale Semiconductor, Inc |
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52 / 57 page  MPR121 Sensors 52 Freescale Semiconductor Section C Section D Register Address Register Name Value Application Note 0x41 ELE0 Touch Threshold 0x0F AN3892 0x42 ELE0 Release Threshold 0x0A AN3892 0x43 ELE1 Touch Threshold 0x0F AN3892 0x44 ELE1 Release Threshold 0x0A AN3892 0x45 ELE2 Touch Threshold 0x0F AN3892 0x46 ELE2 Release Threshold 0x0A AN3892 0x47 ELE3 Touch Threshold 0x0F AN3892 0x48 ELE3 Release Threshold 0x0A AN3892 0x49 ELE4 Touch Threshold 0x0F AN3892 0x4A ELE4 Release Threshold 0x0A AN3892 0x4B ELE5 Touch Threshold 0x0F AN3892 0x4C ELE5 Release Threshold 0x0A AN3892 0x4D ELE6 Touch Threshold 0x0F AN3892 0x4E ELE6 Release Threshold 0x0A AN3892 0x4F ELE7 Touch Threshold 0x0F AN3892 0x50 ELE7 Release Threshold 0x0A AN3892 0x51 ELE8 Touch Threshold 0x0F AN3892 0x52 ELE8 Release Threshold 0x0A AN3892 0x53 ELE9 Touch Threshold 0x0F AN3892 0x54 ELE9 Release Threshold 0x0A AN3892 0x55 ELE10 Touch Threshold 0x0F AN3892 0x56 ELE10 Release Threshold 0x0A AN3892 0x57 ELE11 Touch Threshold 0x0F AN3892 0x58 ELE11 Release Threshold 0x0A AN3892 Description: The touch threshold registers set the minimum delta from the baseline when a touch is detected 0x0F or 15 in decimal is an estimate of the minimum value for touch. Most electrodes will work with this value even if they vary greatly in size and shape. The value of 0x0A or 10 is the release threshold register allowed for hysteresis in the touch detection. Variation: For very small electrodes, smaller values can be used and for very large electrodes the reverse is true. One easy method is to view the deltas actually seen in a system and set the touch at 80% and release at 70% of delta for good performance. Register Address Register Name Value Application Note 0x5D Filter Configuration 0x04 AN3890 Description: There are three settings embedded in this register so it is only necessary to pay attention to one. The ESI controls the sample rate of the device. In the default, the setting used is 0x00 for 1 ms sample rate. Since the SFI is set to 00, resulting in 4 samples averaged, the response time will be 4ms. Variation: To save power, the 1 ms can be increased to 128 ms by increasing the setting to 0x07. The values are base 2 exponential thus 0x01 = 2 ms; 0x02 = 4 ms; and so on to 0x07 = 128 ms. Most of the time, 0x04 results in the best compromise between power consumption and response time. |
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