CAP1028 datasheet(40/71 Pages) SMSC

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8 Channel Capacitive Touch Sensor with 2 LED Drivers

Datasheet

Revision 1.1 (08-05-09)

SMSC CAP1028

DATASHEET

‘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 7 - CS8_EN - Enables the CS8 input to be included during the sampling cycle.

‘0’ - The CS8 input is not included in the sampling cycle.

‘1’ (default) - The CS8 input is included in the sampling cycle.

Bit 6 - CS7_EN - Enables the CS7 input to be included during the sampling cycle.

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

Bit 4 - CS5_EN - Enables the CS5 input to be included during the sampling cycle.

Bit 3 - CS4_EN - Enables the CS4 input to be included during the sampling cycle.

Bit 2 - CS3_EN - Enables the CS3 input to be included during the sampling cycle.

Bit 1 - CS2_EN - Enables the CS2 input to be included during the sampling cycle.

Bit 0 - CS1_EN - Enables the CS1 input to be included during the sampling cycle.

5.8

Sensor Configuration Register

Table 5.10 Sensor Enable Registers

ADDR

R/W

B5B4B3B2B1B0

DEFAULT

21h

R/W

Sensor Enable

CS8_EN

CS7_EN

CS6_EN

CS5_EN

CS4_EN

CS3_EN

CS2_EN

CS1_EN

FFh

Table 5.11 Sensor Configuration Register

ADDR

R/W

B5B4B3B2B1B0

DEFAULT

22h

R/W

Sensor

Configuration

MAX_DUR[3:0]

RPT_RATE[3:0]

A4h

CAP1028 Datasheet(PDF) 40 Page - SMSC Corporation

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