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CAP1128 Datasheet(PDF) 31 Page - Microchip Technology |
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CAP1128 Datasheet(HTML) 31 Page - Microchip Technology |
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31 / 75 page  2015 Microchip Technology Inc. DS00001622B-page 31 CAP1128 During Power-On-Reset (POR), the default values are stored in the registers. A POR is initiated when power is first applied to the part and the voltage on the VDD supply surpasses the POR level as specified in the electrical character- istics. Any reads to undefined registers will return 00h. Writes to undefined registers will not have an effect. When a bit is “set”, this means that the user writes a logic ‘1’ to it. When a bit is “cleared”, this means that the user writes a logic ‘0’ to it. 6.1 Main Control Register The Main Control register controls the primary power state of the device. Bits 7 - 6 - GAIN[1:0] - Controls the gain used by the capacitive touch sensing circuitry. As the gain is increased, the effective sensitivity is likewise increased as a smaller delta capacitance is required to generate the same delta count values. The sensitivity settings may need to be adjusted along with the gain settings such that data overflow does not occur. APPLICATION NOTE: The gain settings apply to both Standby and Active states. B3h R Sensor Input 3 Calibra- tion Stores the upper 8-bit calibration value for sensor input 3 00h Page 63 B4h R Sensor Input 4 Calibra- tion Stores the upper 8-bit calibration value for sensor input 4 00h Page 63 B5h R Sensor Input 5 Calibra- tion Stores the upper 8-bit calibration value for sensor input 5 00h Page 63 B6h R Sensor Input 6 Calibra- tion Stores the upper 8-bit calibration value for sensor input 6 00h Page 63 B7h R Sensor Input 7 Calibra- tion Stores the upper 8-bit calibration value for sensor input 7 00h Page 63 B8h R Sensor Input 8 Calibra- tion Stores the upper 8-bit calibration value for sensor input 8 00h Page 63 B9h R Sensor Input Calibra- tion LSB 1 Stores the 2 LSBs of the calibration value for sensor inputs 1 - 4 00h Page 63 BAh R Sensor Input Calibra- tion LSB 2 Stores the 2 LSBs of the calibration value for sensor inputs 5 - 8 00h Page 63 FDh R Product ID Stores a fixed value that identifies each product 52h Page 63 FEh R Manufacturer ID Stores a fixed value that identifies Microchip 5Dh Page 64 FFh R Revision Stores a fixed value that represents the revision number 83h Page 64 TABLE 6-2: MAIN CONTROL REGISTER ADDR R/W Register B7 B6B5 B4 B3B2B1B0 Default 00h R/W Main Control GAIN[1:0] STBY DSLEEP - - - INT 00h TABLE 6-3: GAIN BIT DECODE GAIN[1:0] Capacitive Touch Sensor Gain 10 00 1 01 2 TABLE 6-1: REGISTER SET IN HEXADECIMAL ORDER (CONTINUED) Register Address R/W Register Name Function Default Value Page |
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