CAP1296 datasheet(38/68 Pages) MICROCHIP

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CAP1296

DS00001569B-page 38

 2013-2015 Microchip Technology Inc.

APPLICATION NOTE: In the case above, bits can be set by host or are automatically set by the device whenever

a sensor input is newly enabled (such as coming out of Deep Sleep, after power-on reset,

when a bit is set in the Sensor Enable Channel Enable register (21h) and the device is in

the Active state, or when a bit is set in the Standby Channel Enable Register (40h) and the

device is in the Standby state).

It serves as an indicator of an analog calibration failure. If any of the bits could not be cleared, the ACAL_FAIL

bit is set (see Section 5.2, "Status Registers"). A bit will fail to clear if a noise bit is set or if the calibration value

is at the maximum or minimum value.

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 5 - CS6_CAL - Bit for CS6 input.

Bit 4 - CS5_CAL - Bit for CS5 input.

Bit 3 - CS4_CAL - Bit for CS4 input.

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 4.9, "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 5 - CS6_INT_EN - Enables the ALERT# pin to be asserted if a touch is detected on CS6 (associated with the CS6

status bit).

Bit 4 - CS5_INT_EN - Enables the ALERT# pin to be asserted if a touch is detected on CS5 (associated with the CS5

status bit).

Bit 3 - CS4_INT_EN - Enables the ALERT# pin to be asserted if a touch is detected on CS4 (associated with the CS4

status bit).

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).

TABLE 5-23:

INTERRUPT ENABLE REGISTER

Addr

R/W

B4B3B2B1B0

Default

27h

R/W

Interrupt

Enable

CS6_

INT_EN

CS5_

INT_EN

CS4_

INT_EN

CS3_

INT_EN

CS2_

INT_EN

CS1_

INT_EN

3Fh

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