CAP1298 datasheet(32/68 Pages) MICROCHIP

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CAP1298

DS00001571B-page 32

 2013-2015 Microchip Technology Inc.

5.6

Configuration Registers

The Configuration registers control general global functionality that affects the entire device.

5.6.1

CONFIGURATION - 20H

Bit 7 - TIMEOUT - Enables the timeout and idle functionality of the SMBus protocol.

• ‘0’ (default) - The SMBus timeout and idle functionality are disabled. The SMBus interface will not time out if the

clock line is held low. Likewise, it will not reset if both the data and clock lines are held high for longer than 200us.

• ‘1’ - The SMBus timeout and idle functionality are enabled. The SMBus interface will reset if the clock line is held

low for longer than 30ms. Likewise, it will reset if both the data and clock lines are held high for longer than 200us.

Bit 5 - DIS_DIG_NOISE - Determines whether the digital noise threshold (see Section 5.20, "Sensor Input Noise Thresh-

old Register") is used by the device. Setting this bit disables the feature.

• ‘0’ - The digital noise threshold is used. If a delta count value exceeds the noise threshold but does not exceed the

touch threshold, the sample is discarded and not used for the automatic recalibration routine.

• ‘1’ (default) - The noise threshold is disabled. Any delta count that is less than the touch threshold is used for the

automatic recalibration routine.

Bit 4 - DIS_ANA_NOISE - Determines whether the analog noise filter is enabled. Setting this bit disables the feature.

• ‘0’ (default) - If low frequency noise is detected by the analog block, the delta count on the corresponding channel

is set to 0. Note that this does not require that Noise Status bits be set.

• ‘1’ - A touch is not blocked even if low frequency noise is detected.

Bit 3 - MAX_DUR_EN - Determines whether the maximum duration recalibration is enabled.

• ‘0’ (default) - The maximum duration recalibration functionality is disabled. A touch may be held indefinitely and no

recalibration will be performed on any sensor input.

• ‘1’ - The maximum duration recalibration functionality is enabled. If a touch is held for longer than the MAX_DUR

bit settings (see Section 5.8), the recalibration routine will be restarted (see Section 4.4.3, "Delayed Recalibra-

tion").

5.6.2

CONFIGURATION 2 - 44H

Bit 6 - BC_OUT_RECAL - Controls whether to retry analog calibration when the base count is out of limit for one or more

sensor inputs.

• ‘0’ - When the BC_OUTx bit is set for a sensor input, the out of limit base count will be used for the sensor input.

• ‘1’ (default) - When the BC_OUTx bit is set for a sensor input (see Section 5.17, "Base Count Out of Limit Regis-

ter"), analog calibration will be repeated on the sensor input.

Bit 5 - BLK_PWR_CTRL - Determines whether the device will reduce power consumption while waiting between con-

version time completion and the end of the sensing cycle.

• ‘0’ (default) - The device will reduce power consumption during the time between the end of the last conversion

and the end of the sensing cycle.

• ‘1’ - The device will not reduce power consumption during the time between the end of the last conversion and the

end of the sensing cycle.

TABLE 5-11:

CONFIGURATION REGISTERS

Addr

R/W

Default

20h

R/W

Configuration

TIME

OUT

DIS_

DIG_

NOISE

DIS_

ANA_

NOISE

MAX_

DUR_EN

20h

44h

R/W

Configuration

BC_

OUT_

RECAL

BLK_

PWR_

CTRL

BC_

OUT_

INT

SHOW_

RF_

NOISE

DIS_

RF_

NOISE

ACAL

_FAIL

_INT

INT_

REL_

40h

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