CAP1128 datasheet(42/75 Pages) MICROCHIP

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CAP1128

DS00001622B-page 42

 2015 Microchip Technology Inc.

Bit 2 - CS3_INT_EN - Enables the interrupt pin to be asserted if a touch is detected on CS3 (associated with the CS3

status bit).

Bit 1 - CS2_INT_EN - Enables the interrupt pin to be asserted if a touch is detected on CS2 (associated with the CS2

status bit).

Bit 0 - CS1_INT_EN - Enables the interrupt pin to be asserted if a touch is detected on CS1 (associated with the CS1

status bit).

6.13

Repeat Rate Enable Register

The Repeat Rate Enable register enables the repeat rate of the sensor inputs as described in Section 5.6.1.

Bit 7 - CS8_RPT_EN - Enables the repeat rate for capacitive touch sensor input 8.

• ‘0’ - The repeat rate for CS8 is disabled. It will only generate an interrupt when a touch is detected and when a

release is detected (if enabled) no matter how long the touch is held for.

• ‘1’ (default) - The repeat rate for CS8 is enabled. In the case of a “touch” event, it will generate an interrupt when a

touch is detected and a release is detected (as determined by the INT_REL_n bit - see Section 6.6). 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 6 - CS7_RPT_EN - Enables the repeat rate for capacitive touch sensor input 7.

Bit 5 - CS6_RPT_EN - Enables the repeat rate for capacitive touch sensor input 6.

Bit 4 - CS5_RPT_EN - Enables the repeat rate for capacitive touch sensor input 5.

Bit 3 - CS4_RPT_EN - Enables the repeat rate for capacitive touch sensor input 4.

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.

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 - CS8) 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.

TABLE 6-23:

REPEAT RATE ENABLE REGISTER

ADDR

R/W

B4B3B2B1

Default

28h

R/W

Repeat Rate

Enable

CS8_

RPT_EN

CS7_

RPT_EN

CS6_

RPT_EN

CS5_

RPT_EN

CS4_

RPT_EN

CS3_

RPT_EN

CS2_

RPT_EN

CS1_

RPT_EN

FFh

TABLE 6-24:

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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