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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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STMPE1208S датащи(PDF) 14 Page - STMicroelectronics |
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STMPE1208S датащи(HTML) 14 Page - STMicroelectronics |
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14 / 51 page  Capacitive sensors STMPE1208S 14/51 5 Capacitive sensors The STMPE1208S capacitive sensor is based on fully digital, impedance change detection engine that is capable of detecting very small change in capacitance. Figure 8. Capacitive sensors 5.1 Capacitive sensing The STMPE1208S senses a human touch by the additional capacitance introduced to the pad (with respect to ground). This capacitance causes a delay in a clock signal on the sensing pad, and the delay in the sensing pad is compared with a reference clock and the difference is a direct representation of the additional capacitance introduced by the proximity/touch of finger. Figure 9. Capacitive sensing Automatic calibration Unit Calibration control parameters Data filtering Data filtering control Parameters 7-bit impedance value of each channel Touchkey Impedance sensor Calibrated impedance Touched keys |
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