CAP1133 datasheet(30/63 Pages) MICROCHIP

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CAP1133

DS00001625B-page 30

 2015 Microchip Technology Inc.

6.11

Calibration Activate Register

The Calibration Activate register forces the respective sensor inputs to be re-calibrated affecting both the analog and

digital blocks. During the re-calibration routine, the sensor inputs will not detect a press for up to 600ms and the Sensor

Input Base Count register values will be invalid. During this time, any press on the corresponding sensor pads will inval-

idate the re-calibration. When finished, the CALX[9:0] bits will be updated (see Section 6.39).

When the corresponding bit is set, the device will perform the calibration and the bit will be automatically cleared once

the re-calibration routine has finished.

Bit 2 - CS3_CAL - When set, the CS3 input is re-calibrated. This bit is automatically cleared once the sensor input has

been re-calibrated successfully.

Bit 1 - CS2_CAL - When set, the CS2 input is re-calibrated. This bit is automatically cleared once the sensor input has

been re-calibrated successfully.

Bit 0 - CS1_CAL - When set, the CS1 input is re-calibrated. This bit is automatically cleared once the sensor input has

been re-calibrated successfully.

6.12

Interrupt Enable Register

The Interrupt Enable register determines whether a sensor pad touch or release (if enabled) causes the interrupt pin to

be asserted.

Bit 2 - CS3_INT_EN - Enables the interrupt pin to be asserted if a touch is detected on CS3 (associated with the CS3

status bit).

• ‘0’ - The interrupt pin will not be asserted if a touch is detected on CS3 (associated with the CS6 status bit).

• ‘1’ (default) - The interrupt pin will be asserted if a touch is detected on CS3 (associated with the CS6 status bit).

Bit 1 - CS2_INT_EN - Enables the interrupt pin to be asserted if a touch is detected on CS2 (associated with the CS2

status bit).

Bit 0 - CS1_INT_EN - Enables the interrupt pin to be asserted if a touch is detected on CS1 (associated with the CS1

status bit).

6.13

Repeat Rate Enable Register

The Repeat Rate Enable register enables the repeat rate of the sensor inputs as described in Section 5.4.1.

Bit 2 - CS3_RPT_EN - Enables the repeat rate for capacitive touch sensor input 3.

• ‘0’ - The repeat rate for CS3 is disabled. It will only generate an interrupt when a touch is detected and when a

release is detected no matter how long the touch is held for.

• ‘1’ (default) - The repeat rate for CS3 is enabled. In the case of a “touch” event, it will generate an interrupt when a

touch is detected and a release is detected (as determined by the INT_REL_n bit - see Section 6.6). In the case of

a “press and hold” event, it will generate an interrupt when a touch is detected and at the repeat rate so long as

TABLE 6-21:

CALIBRATION ACTIVATE REGISTER

ADDR

R/W

B5B4

B3B2B1

Default

26h

R/W

Calibration

Activate

CS3_

CAL

CS2_

CAL

CS1_

CAL

00h

TABLE 6-22:

INTERRUPT ENABLE REGISTER

ADDR

R/W

Default

27h

R/W

Interrupt

Enable

CS3_

INT_EN

CS2_

INT_EN

CS1_

INT_EN

07h

TABLE 6-23:

REPEAT RATE ENABLE REGISTER

ADDR

R/W

B4B3B2B1

Default

28h

R/W

Repeat Rate

Enable

CS3_

RPT_EN

CS2_

RPT_EN

CS1_

RPT_EN

07h

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