CAP1298 datasheet(42/68 Pages) MICROCHIP

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CAP1298

DS00001571B-page 42

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Bit 1 - COMP_PTRN - Determines whether the MTP detection circuitry will use the Multiple Touch Pattern register as a

specific pattern of sensor inputs or as an absolute number of sensor inputs.

• ‘0’ (default) - The MTP detection circuitry will use the Multiple Touch Pattern register bit settings as an absolute

minimum number of sensor inputs that must be above the threshold or have Noise Flag Status bits set. The num-

ber will be equal to the number of bits set in the register.

• ‘1’ - The MTP detection circuitry will use pattern recognition. Each bit set in the Multiple Touch Pattern register

indicates a specific sensor input that must have a delta count greater than the MTP threshold or have a Noise Flag

Status bit set. If the criteria are met, the MTP status bit will be set.

Bit 0 - MTP_ALERT - Enables an interrupt if an MTP event occurs. In either condition, the MTP status bit will be set.

• ‘0’ (default) - If an MTP event occurs, the ALERT# pin is not asserted.

• ‘1’ - If an MTP event occurs, the ALERT# pin will be asserted.

5.16

Multiple Touch Pattern Register

The Multiple Touch Pattern register acts as a pattern to identify an expected sensor input profile for diagnostics or other

significant events. There are two methods for how the Multiple Touch Pattern register is used: as specific sensor inputs

or number of sensor input that must exceed the MTP threshold or have Noise Flag Status bits set. Which method is used

is based on the COMP_PTRN bit (see Section 5.15). The methods are described below.

Specific Sensor Inputs: If, during a single sensing cycle, the specific sensor inputs above the MTP threshold or

with Noise Flag Status bits set match those bits set in the Multiple Touch Pattern register, an MTP event is

flagged.

Number of Sensor Inputs: If, during a single sensing cycle, the number of sensor inputs with a delta count above

the MTP threshold or with Noise Flag Status bits set is equal to or greater than the number of pattern bits set, an

MTP event is flagged.

For all bits in this register:

• ‘0’ - The specified sensor input is not considered a part of the pattern.

• ‘1’ - The specified sensor input is considered a part of the pattern, or the absolute number of sensor inputs that

must have a delta count greater than the MTP threshold or have the Noise Flag Status bit set is increased by 1.

Bit 7 - CS8_PTRN - Determines whether CS8 is considered as part of the Multiple Touch Pattern.

Bit 6 - CS7_PTRN - Determines whether CS7 is considered as part of the Multiple Touch Pattern.

TABLE 5-29:

MTP_TH BIT DECODE

MTP_TH[1:0]

Threshold Divide Setting

12.5% (default)

25%

37.5%

100%

TABLE 5-30:

MULTIPLE TOUCH PATTERN REGISTER

Addr

R/W

Default

2Dh

R/W

Multiple

Touch

Pattern

CS8_

PTRN

CS7_

PTRN

CS6_

PTRN

CS5_

PTRN

CS4_

PTRN

CS3_

PTRN

CS2_

PTRN

CS1_

PTRN

FFh

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