CAP1296 Datasheet, PDF (51/68 Pages) Microchip Technology – 6-Channel Capacitive Touch Sensor with Proximity

CAP1296
TABLE 5-51: SENSOR INPUT CALIBRATION REGISTERS (CONTINUED)
Addr
Register
R/W
B7
B6
B5
B4
B3
B2
B1
B0
Default
B5h
Sensor Input 5
Calibration
R
CAL5_9 CAL5_8 CAL5_7 CAL5_6 CAL5_5 CAL5_4 CAL5_3 CAL5_2
00h
B6h
Sensor Input 6
Calibration
R
CAL6_9 CAL6_8 CAL6_7 CAL6_6 CAL6_5 CAL6_4 CAL6_3 CAL6_2
00h
Sensor Input
B9h Calibration LSB
R
CAL4_1 CAL4_0 CAL3_1 CAL3_0 CAL2_1 CAL2_0 CAL1_1 CAL1_0
00h
1
Sensor Input
BAh Calibration LSB
R
-
-
-
-
CAL6_1 CAL6_0 CAL5_1 CAL5_0
00h
2
The Sensor Input Calibration registers hold the 10-bit value that represents the last calibration value. The value rep-
resents the capacitance applied to the internal sensing circuits to balance the capacitance of the sensor input pad. Min-
imum (000h) and maximum (3FFh) values indicate analog calibration failure (see Section 4.4, "Sensor Input
Calibration").
5.29 Calibration Sensitivity Configuration Registers
TABLE 5-52: CALIBRATION SENSITIVITY CONFIGURATION REGISTERS
Addr
80h
81h
Register
Calibration
Sensitivity
Config 1
Calibration
Sensitivity
Config 2
R/W B7
B6
B5
B4
B3
B2
B1
B0 Default
R/W CALSEN4[1:0] CALSEN3[1:0] CALSEN2[1:0] CALSEN1[1:0]
00h
R/W
-
-
-
-
CALSEN6[1:0] CALSEN5[1:0]
00h
CALSENx[1:0] - Controls the gain used by the calibration routine to enable sensor inputs to be more sensitive for prox-
imity detection. Gain is based on capacitance touch pad capacitance ranges, as shown in Table 5-53. Since each sensor
input can have a different pad capacitance, each sensor input has a control.
TABLE 5-53: CALSENX BIT DECODE
CALSENx[1:0]
1
0
0
0
0
1
1
0
Gain
1
2
4
Capacitive Touch Pad Capacitance
Range
5-50pF (default)
0-25pF
0-12.5pF
 2013-2015 Microchip Technology Inc.
DS00001569B-page 51