CAP1293 datasheet(29/63 Pages) MICROCHIP

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DS00001566B-page 29

CAP1293

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.

TABLE 5-10:

BASE_SHIFT BIT DECODE

BASE_SHIFT[3:0]

Data Scaling Factor

16x

32x

64x

128x

256x

All others

256x

(default = 1111b)

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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