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STMPE821 数据表(PDF) 33 Page - STMicroelectronics |
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STMPE821 数据表(HTML) 33 Page - STMicroelectronics |
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33 / 55 page  STMPE821 Capacitive touch module registers 33/55 FILTER_THRESHOLD Filter threshold Address: 0x29 Type: R/W Reset: 0x00 Description: Filter threshold. REFERENCE_DELAY Reference delay Address: 0x2A Type: R/W Reset: 0x00 Description: Shifting of capacitive sensor dynamic range. The capacitance value set into this register is in effect, equivalent to capacitor connected to the S_Ref pin. 7654 3 2 1 0 FILTER_THRESHOLD [7:0] FILTER_THRESHOLD: An internal "Filter Counter" is compared with Filter Threshold [7:0] to determine if a valid touch has occurred. 7654 3 2 1 0 RESERVED REFERENCE_DELAY [7] RESERVED [6:0] REFERENCE_DELAY: Valid range = 0-127 Each step represents capacitance value of 0.06 pF Warm reset is required after this value is updated |
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