CAP1208 datasheet(35/67 Pages) MICROCHIP

35 / 67 page

8-Channel Capacitive Touch Sensor

Datasheet

 2014 Microchip Technology Inc.

DS00001570B-page 35

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 Threshold 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.

64x

128x

256x

All others

256x

(default = 1111b)

Table 5.9 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

Table 5.8 BASE_SHIFT Bit Decode (continued)

BASE_SHIFT[3:0]

DATA SCALING

FACTOR

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