CAP1028 datasheet(46/71 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

5.14

Multiple Touch Configuration Register

The Multiple Touch Configuration register controls the settings for the multiple touch detection circuitry.

These settings determine the number of simultaneous buttons that may be pressed before action is

taken.

Bit 7 - MULT_BLK_EN - Enables the multiple button blocking circuitry.

‘0’ - The multiple touch circuitry is disabled. The device will not block multiple touches.

‘1’ (default)- The multiple touch circuitry is enabled. The device will accept the number of touches

equal to programmed multiple touch threshold and block all others. It will remember which sensor

is valid and block all others until that sensor has been released.

Bits 3 - 2 - B_MULT_T[1:0] - Determines the number of simultaneous touches on all sensors before a

Multiple Touch Event is detected and sensors are blocked. The bit decode is given by Table 5.22.

5.15

Recalibration Configuration Register

The Recalibration Configuration register controls the automatic re-calibration routine settings as well

as advanced controls to program the Sensor Threshold register settings.

Bit 7 - BUT_LD_TH - Enables setting all Sensor Threshold registers by writing to the Sensor 1

Threshold register.

‘0’ - Each Sensor X Threshold register is updated individually.

‘1’ (default) - Writing the Sensor 1 Threshold register will automatically overwrite the Sensor

Threshold registers for all sensors (Sensor Threshold 1 through Sensor Threshold 8). The

Table 5.21 Multiple Touch Configuration

ADDR

R/W

DEFAULT

2Ah

R/W

Multiple Touch

Config

MULT_

BLK_EN

B_MULT_T[1:0]

80h

Table 5.22 B_MULT_T Bit Decode

B_MULT_T[1:0]

NUMBER OF SIMULTANEOUS TOUCHES

1 (default)

Table 5.23 Recalibration Configuration Registers

ADDR

R/W

DEFAULT

2Fh

R/W

Recalibration

Configuration

BUT_

LD_TH

NEG_DELTA_

CNT[1:0]

CAL_CFG[2:0]

8Bh

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