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QST608KM0 Datasheet(PDF) 10 Page - STMicroelectronics |
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QST608KM0 Datasheet(HTML) 10 Page - STMicroelectronics |
10 / 51 page QST touch sensing technology QST108 10/51 Figure 3 shows an example of detection with DI=2 and EDI=2 meaning 3 consecutive samples are necessary to trigger the key detection or end of detection Figure 3. Detection signals 3.6 Self-calibration On power-up, all keys are self-calibrated to provide reliable operation under almost any conditions. The calibration phase is used to compute a reference value per key which is then used by the process determining if a key is touched or not. The reference is an average of 8 single acquisitions. As a result, the calibration time of the system can be simply calculated using the following formula: tCAL = 8 * Burst_Period. The methodology used to measure the burst period is described in application note AN2547. For a maximum calibration duration (tCAL), please refer to Section 6.6: Capacitive sensing characteristics on page 35. 3.7 Fast positive recalibration The device autorecalibrates a key when its signal reflects a decrease in capacitance higher than a fixed threshold (PosRecalTh) for a defined number of acquisitions (PosRecalI). 3.8 Forced key recalibration A recalibration of the device may be issued at any time by sending to the QST device the appropriate I2C command or by tying the RESET pin to ground. It is possible to recalibrate independently any individual key using an I2C command. Time Reference count Reference + EofDeTh Reference + DeTh Hysteresis Key Detection signal = Sampling point |
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