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STMPE821 Datasheet(PDF) 38 Page - STMicroelectronics |
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STMPE821 Datasheet(HTML) 38 Page - STMicroelectronics |
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38 / 55 page  Capacitive touch module registers STMPE821 38/55 CALIBRATED_IMPEDANCE Calibrated impedance Address: 0x70 - 0x77 Type: R Reset: 0x00 Description: Calibrated impedance is a reference value maintained by the device. IMPEDANCE Impedance Address: 0x80 - 0x87 Type: R Reset: 0x00 Description: Impedance is the instantaneous impedance value seen at the input pin of each cap. sensing pin. 7 654 3210 CAL_IMPEDANCE [7:0] CALIBRATED IMPEDANCE: Calibrated reference impedance 7 654 3210 IMPEDANCE [7:0] IMPEDANCE: Currently sensed impedance. This impedance reading decreases with the increase of the capacitance at sensing channel. When this register reads 0x7F, reference capacitance should be reduced. When this register reads 0x00, reference capacitance should be increased. |
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