CAP1203 datasheet(33/59 Pages) MICROCHIP

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 2013-2015 Microchip Technology Inc.

DS00001572B-page 33

APPLICATION NOTE: In the case above, do not check the Calibration Activate and Status bits for failures unless

the ACAL_FAIL bit is set. In addition, if a sensor input is newly enabled, do not check the

Calibration Activate and Status bits until time has elapsed to complete calibration on the

sensor input. Otherwise, the ACAL_FAIL bit may be set for one sensor input, but the newly

enabled sensor input may still be set to ‘1’ in the Calibration Activate and Status, not because

it failed, but because it has not been calibrated yet.

For all bits in this register:

• ‘0’ - No action needed.

• ‘1’ - Writing a ‘1’, forces a calibration on the corresponding sensor input. If the ACAL_FAIL flag is set and this bit is

set (see application note above), the sensor input could not complete analog calibration.

Bit 2 - CS3_CAL - Bit for CS3 input.

Bit 1 - CS2_CAL - Bit for CS2 input.

Bit 0 - CS1_CAL - Bit for CS1 input.

APPLICATION NOTE: Writing a ‘0’ to clear a ‘1’ may cause a planned calibration to be skipped, if the calibration

routine had not reached the sensor input yet.

5.11

Interrupt Enable Register

The Interrupt Enable register determines whether a sensor pad touch or release (if enabled) causes an interrupt (see

Section 4.8, "Interrupts").

For all bits in this register:

• ‘0’ - The ALERT# pin will not be asserted if a touch is detected on the specified sensor input.

• ‘1’ (default) - The ALERT# pin will be asserted if a touch is detected on the specified sensor input.

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

status bit).

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

status bit).

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

status bit).

5.12

Repeat Rate Enable Register

The Repeat Rate Enable register enables the repeat rate of the sensor inputs as described in Section 4.8.2, "Capacitive

Sensor Input Interrupt Behavior".

For all bits in this register:

• ‘0’ - The repeat rate for the specified sensor input is disabled. It will only generate an interrupt when a touch is

TABLE 5-21:

INTERRUPT ENABLE REGISTER

Addr

R/W

B4B3B2B1B0

Default

27h

R/W

Interrupt

Enable

CS3_

INT_EN

CS2_

INT_EN

CS1_

INT_EN

07h

TABLE 5-22:

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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