CAP1214 datasheet(61/107 Pages) MICROCHIP

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Multiple Channel Capacitive Touch Sensor and LED Driver

Datasheet

SMSC CAP1214

Revision 1.0 (08-30-10)

DATASHEET

6.23

Multiple Touch Configuration Register

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

These settings determine the number of sensors associated with this detection and the CAP1214

device behavior.

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 buttons (excluding

the Grouped buttons) before a Multiple Touch Event is flagged. If the number of multiple buttons

touches is greater than the threshold value, a Multiple Touch Event is flagged. The bit decode is given

by Table 6.32.

Bits 1 - 0 - G_MULT_T[1:0] - Determines the number of simultaneous touches on all Grouped buttons

before a Multiple Touch Event is flagged. If the number of multiple buttons touches is greater than the

threshold value, a Multiple Touch Event is flagged. The bit decode is given by Table 6.33.

Table 6.31 Multiple Touch Configuration Register

ADDR

R/W

DEFAULT

2Ah

R/W

Multiple

Touch Config

MULT_

BLK_EN

B_MULT_T[1:0]

G_MULT_T[1:0]

82h

Table 6.32 B_MULT_T Bit Decode

B_MULT_T[1:0]

NUMBER OF SIMULTANEOUS

TOUCHES

1 (default)

Table 6.33 G_MULT_T Bit Decode

G_MULT_T[1:0]

NUMBER OF SIMULTANEOUS

TOUCHES

4 (default)

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