CAP1298 datasheet(52/68 Pages) MICROCHIP

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CAP1298

DS00001571B-page 52

 2013-2015 Microchip Technology Inc.

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

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 5-19. Since each sensor

input can have a different pad capacitance, each sensor input has a control.

5.30

Product ID Register

B9h

Sensor Input

Calibration

LSB 1

CAL4_1

CAL4_0

CAL3_1

CAL3_0

CAL2_1

CAL2_0

CAL1_1

CAL1_0

00h

BAh

Sensor Input

Calibration

LSB 2

CAL8_1

CAL8_0

CAL7_1

CAL7_0

CAL6_1

CAL6_0

CAL5_1

CAL5_0

00h

TABLE 5-18:

CALIBRATION SENSITIVITY CONFIGURATION REGISTERS

Addr

R/W

B7B6

B4B3B2B1B0

Default

80h

Calibration

Sensitivity

Config 1

R/W

CALSEN4[1:0]

CALSEN3[1:0]

CALSEN2[1:0]

CALSEN1[1:0]

00h

81h

Calibration

Sensitivity

Config 2

R/W

CALSEN8[1:0]

CALSEN7[1:0]

CALSEN6[1:0]

CALSEN5[1:0]

00h

TABLE 5-19:

CALSENX BIT DECODE

CALSENx[1:0]

Gain

Capacitive Touch Pad Capacitance

Range

5-50pF (default)

0-25pF

0-12.5pF

TABLE 5-20:

PRODUCT ID REGISTER

Addr

R/W

B7B6B5B4B3B2B1

Default

FDh

Product ID

CAP1298

01110001

71h

TABLE 5-17:

SENSOR INPUT CALIBRATION REGISTERS (CONTINUED)

Addr

R/W

Default

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