CAP1133 datasheet(25/63 Pages) MICROCHIP

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DS00001625B-page 25

CAP1133

6.6

Configuration Registers

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

6.6.1

CONFIGURATION - 20H

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

• ‘0’ (default for Functional Revision C) - The SMBus timeout and idle functionality are disabled. The SMBus inter-

face 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. This is used for I2C compliance.

• ‘1’ (default for Functional Revision B) - The SMBus timeout and idle functionality are enabled. The SMBus inter-

face will time out 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 6.19, "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 re-calibration routine.

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

automatic re-calibration 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

re-calibration 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, then the re-calibration routine will be restarted (see Section 6.8).

16x

32x

64x

128x

256x

All others

256x

(default = 1111b)

TABLE 6-10:

CONFIGURATION REGISTERS

ADDR

R/W

Default

20h

R/W

Configuration

TIMEOUT

DIS_ DIG_

NOISE

DIS_ ANA_

NOISE

MAX_

DUR_EN

A0h

(Rev B)

20h

(rev C)

44h

R/W

Configuration 2

INV_LINK_

TRAN

ALT_

POL

BLK_PWR_

CTRL

BLK_POL_

MIR

SHOW_

RF_

NOISE

DIS_

RF_

NOISE

INT_

REL_n

40h

TABLE 6-9:

BASE_SHIFT BIT DECODE (CONTINUED)

BASE_SHIFT[3:0]

Data Scaling Factor

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