CAP1208 datasheet(45/67 Pages) MICROCHIP

45 / 67 page

8-Channel Capacitive Touch Sensor

Datasheet

 2014 Microchip Technology Inc.

DS00001570B-page 45

5.15

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:

1. 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.

2. 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

(see Section 5.16, "Multiple Touch Pattern Register"). 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.

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

4. All sensor inputs will remain blocked so long as the requisite number of sensor inputs are above

the MTP threshold 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.

Bit 7 - MTP_EN - Enables the multiple touch pattern detection circuitry.



‘0’ (default) - The MTP detection circuitry is disabled.



‘1’ - The MTP detection circuitry is enabled.

Bits 3 - 2 - MTP_TH[1:0] - Determine the MTP threshold, as shown in Table 5.26. This threshold is a

percentage of sensor input threshold (see Section 5.19, "Sensor Input Threshold Registers") for inputs

enabled in the Active state or of the standby threshold (see Section 5.24, "Standby Threshold

Table 5.24 B_MULT_T Bit Decode

B_MULT_T[1:0]

NUMBER OF SIMULTANEOUS TOUCHES

1 (default)

Table 5.25 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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