CAP1293 datasheet(48/63 Pages) MICROCHIP

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CAP1293

DS00001566B-page 48

 2013-2015 Microchip Technology Inc.

5.28

Sensor Input Calibration Registers

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 Register

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 5-51:

SENSOR INPUT CALIBRATION REGISTERS

Addr

R/W

Default

B1h

Sensor Input 1

Calibration

CAL1_9

CAL1_8

CAL1_7

CAL1_6

CAL1_5

CAL1_4

CAL1_3

CAL1_2

00h

B2h

Sensor Input 2

Calibration

CAL2_9

CAL2_8

CAL2_7

CAL2_6

CAL2_5

CAL2_4

CAL2_3

CAL2_2

00h

B3h

Sensor Input 3

Calibration

CAL3_9

CAL3_8

CAL3_7

CAL3_6

CAL3_5

CAL3_4

CAL3_3

CAL3_2

00h

B9h

Sensor Input

Calibration LSB

CAL3_1

CAL3_0

CAL2_1

CAL2_0

CAL1_1

CAL1_0

00h

TABLE 5-52:

CALIBRATION SENSITIVITY CONFIGURATION REGISTER

Addr

R/W

B7B6

B4B3B2B1B0

Default

80h

Calibration

Sensitivity

Config 1

R/W

CALSEN3[1:0]

CALSEN2[1:0]

CALSEN1[1:0]

00h

TABLE 5-53:

CALSENX BIT DECODE

CALSENx[1:0]

Gain

Capacitive Touch Pad Capacitance

Range

5-50pF (default)

0-25pF

0-12.5pF

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