CAP1106 datasheet(30/48 Pages) MICROCHIP

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CAP1106

DS00001624B-page 30

 2015 Microchip Technology Inc.

6.14

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 additional buttons are blocked and the MULT

status bit is set.

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 flag the number of touches equal to pro-

grammed multiple touch threshold and block all others. It will remember which sensor inputs are valid and block all

others until that sensor pad has been released. Once a sensor pad has been released, the N detected touches

(determined via the cycle order of CS1 - CS6) will be flagged and all others blocked.

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

Event is detected and sensor inputs are blocked. The bit decode is given by Table 6-25.

6.15

Multiple Touch Pattern Configuration Register

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

This circuitry works like the multiple touch detection circuitry with the following differences:

The detection threshold is a percentage of the touch detection threshold as defined by the MTP_TH[1:0] bits

whereas the multiple touch circuitry uses the touch detection threshold.

The MTP detection circuitry either will detect a specific pattern of sensor inputs as determined by the Multiple

Touch Pattern register settings or it will use the Multiple Touch Pattern register settings to determine a minimum

number of sensor inputs that will cause the MTP circuitry to flag an event. When using pattern recognition mode,

if all of the sensor inputs set by the Multiple Touch Pattern register have a delta count greater than the MTP

threshold or have their corresponding Noise Flag Status bits set, the MTP bit will be set. When using the absolute

number mode, if the number of sensor inputs with thresholds above the MTP threshold or with Noise Flag Status

bits set is equal to or greater than this number, the MTP bit will be set.

When an MTP event occurs, all touches are blocked and an interrupt is generated.

All sensor inputs will remain blocked so long as the requisite number of sensor inputs are above the MTP thresh-

old or have Noise Flag Status bits set. Once this condition is removed, touch detection will be restored. Note that

the MTP status bit is only cleared by writing a ‘0’ to the INT bit once the condition has been removed.

TABLE 6-24:

MULTIPLE TOUCH CONFIGURATION

ADDR

R/W

Default

2Ah

R/W

Multiple Touch

Config

MULT_

BLK_

B_MULT_T[1:0]

80h

TABLE 6-25:

B_MULT_T BIT DECODE

B_MULT_T[1:0]

Number of Simultaneous Touches

1 (default)

TABLE 6-26:

MULTIPLE TOUCH PATTERN CONFIGURATION

ADDR

R/W

Default

2Bh

R/W

Multiple Touch

Pattern Config

MTP_ EN

MTP_TH[1:0]

COMP_

PTRN

MTP_

ALERT

00h

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