CAP1293 datasheet(37/63 Pages) MICROCHIP

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DS00001566B-page 37

CAP1293

detected and when a release is detected (if enabled) no matter how long the touch is held.

• ‘1’ (default) - The repeat rate for the specified sensor input is enabled. In the case of a “touch” event, it will gener-

ate an interrupt when a touch is detected and a release is detected (as determined by the INT_REL_n bit - see

Section 5.6, "Configuration Registers"). In the case of a “press and hold” event, it will generate an interrupt when a

touch is detected and at the repeat rate so long as the touch is held.

Bit 2 - CS3_RPT_EN - Enables the repeat rate for capacitive touch sensor input 3.

Bit 1 - CS2_RPT_EN - Enables the repeat rate for capacitive touch sensor input 2.

Bit 0 - CS1_RPT_EN - Enables the repeat rate for capacitive touch sensor input 1.

5.13

Signal Guard Enable Register

The Signal Guard Enable register enables the signal guard for the specified sensor inputs as described in Section 4.5.1,

"Signal Guard". When the signal guard is enabled, CS2 is disabled.

For all bits in this register:

• ‘0’ (default) - The signal guard is disabled for the specified sensor input.

• ‘1’ - The signal guard is enabled for the specified sensor input.

Bit 2 - CS3_SG_EN - Enables the signal guard for capacitive touch sensor input 3.

Bit 0 - CS1_SG_EN - Enables the signal guard for capacitive touch sensor input 1.

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 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 sensing cycle order of CS1 - CS3) 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 5-27.

TABLE 5-25:

SIGNAL GUARD ENABLE REGISTER

Addr

R/W

B4B3B2B1

Default

29h

R/W

Signal

Guard

Enable

CS3_

SG_EN

CS1_

SG_EN

00h

TABLE 5-26:

MULTIPLE TOUCH CONFIGURATION

Addr

R/W

Default

2Ah

R/W

Multiple Touch

Config

MULT

_BLK_

B_MULT_T[1:0]

80h

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