CAP1114 datasheet(51/102 Pages) SMSC

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Multiple Channel Capacitive Touch Sensor and LED Driver

Datasheet

SMSC CAP1114

Revision 1.1 (02-04-11)

DATASHEET

6.14

Configuration Register

The Configuration Register controls general global functionality that affects the entire device.

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 150us. This is used for I2C compliance.

‘1’ - The SMBus timeout and idle functionality are enabled. The SMBus interface 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 150us.

APPLICATION NOTE: The idle timeout does not apply to the Deep Sleep state. When the CAP1114 is operating in

Deep Sleep, if the host communicates with a device other than the CAP1114 and no stop bit

is set, the CAP1114 will not reset the protocol and, therefore, will not respond to

communications until a stop bit is sent.

Bit 6 - POS_VOL - Determines the behavior of the POS[6:0] status bits when a Grouped sensor is

activated - see Section 6.4.

‘0’ (default) - The POS[6:0] bits represent position information that indicates which sensor was

touched or the last sensor touched during a slide.

‘1’ - The POS[6:0] bits represent volumetric data. The Position / Volumetric Data register is read /

write.

Bit 5 - BLK_DIG_NOISE - Determines whether the noise threshold is checked when determining

whether to discard samples.

‘0’ - The noise threshold is enabled and checked. If a sample is above the noise threshold, it is not

included in the re-calibration routine.

‘1’ (default) - The noise threshold is disabled. No samples are excluded from the re-calibration

routine.

Bit 4 - BLK_ANA_NOISE - Determines whether the noise flag setting will block a touch detection as

well as the analog calibration routine.

‘0’ (default) If noise is detected on the low frequency noise detector, a touch is blocked on the

corresponding channel and will force the analog calibration routine to retry. Note that this does not

require the Noise Status register bits to be set.

‘1’ - A touch is not blocked if low frequency noise is detected. Likewise, the analog calibration

routine will not retry if the analog noise bit is set.

Bit 3 - MAX_DUR_EN_B - Determines whether the maximum duration recalibration is enabled for non-

grouped sensors.

‘0’ - The maximum duration recalibration functionality is disabled. A press may be held indefinitely

and no re-calibration will be performed on any button.

‘1’ (default) - The maximum duration recalibration functionality is enabled. If a press is held for

longer than the MAX_DUR_B bit settings, the re-calibration routine will be restarted (see

Section 6.16).

Table 6.19 Configuration Register

ADDR

R/W

DEFAULT

20h

R/W

Configuration

TIME

OUT

POS_

VOL

BLK_

DIG_

NOISE

BLK_

ANA_

NOISE

MAX_

DUR_

EN_B

RPT_

EN_B

MAX_

DUR_

EN_G

RPT_

EN_G

29h

CAP1114 Datasheet(PDF) 51 Page - SMSC Corporation

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