CAP1006 datasheet(33/53 Pages) SMSC

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5 and 6 Channel Capacitive Touch Sensor

Datasheet

SMSC CAP1005 / CAP1006

Revision 1.1 (08-05-09)

DATASHEET

5.6

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.

Bit 5 - BLK_DIG_NOISE - Determines whether the digital noise threshold is used by the device.

‘0’ - The digital noise threshold is used. If a delta count value exceeds the noise threshold but does

not exceed the touch threshold, then the sample is discarded and not used for the automatic re-

calibration routine.

‘1’ (default) - The noise threshold is not used. Any delta count that is less than the touch threshold

is used for the automatic re-calibration routine.

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

detection as well as the analog calibration routine.

‘0’ (default) - If the analog noise bit is set, then a touch is blocked on the corresponding channel

and will force the analog calibration routine to retry.

‘1’ - A touch is not blocked even if the analog noise bit is set. Likewise, the analog calibration

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

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

grouped sensors.

‘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.

‘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 5.8).

5.7

Sensor Enable Registers

The Sensor Enable registers determine whether a Capacitive Touch Sensor input is included in the

sampling cycle. The length of the sampling cycle is not affected by the number of sensors measured.

Bit 5 - CS6_EN - Enables the CS6 input to be included during the sampling cycle.

‘0’ - The CS6 input is not included in the sampling cycle.

Table 5.9 Configuration Register

ADDR

R/W

DEFAULT

20h

R/W

Configuration

TIMEOUT

BLK_ DIG_

NOISE

BLK_ ANA_

NOISE

MAX_DUR_

20h

Table 5.10 Sensor Enable Registers

ADDR

R/W

B5B4B3B2B1B0

DEFAULT

21h

R/W

Sensor Enable

CS6_EN

CS5_EN

CS4_EN

CS3_EN

CS2_EN

CS1_EN

3Fh

CAP1006 Datasheet(PDF) 33 Page - SMSC Corporation

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