CAP1128 datasheet(44/75 Pages) MICROCHIP

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CAP1128

DS00001622B-page 44

 2015 Microchip Technology Inc.

• ‘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.

6.16

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 6.15). The methods are described below.

Specific Sensor Inputs: If, during a single polling 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 polling 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.

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

• ‘0’ - CS8 is not considered a part of the pattern.

• ‘1’ - CS8 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 6 - CS7_PTRN - Determines whether CS7 is considered as part of the Multiple Touch Pattern.

Bit 5 - CS6_PTRN - Determines whether CS6 is considered as part of the Multiple Touch Pattern.

Bit 4 - CS5_PTRN - Determines whether CS5 is considered as part of the Multiple Touch Pattern.

Bit 3 - CS4_PTRN - Determines whether CS4 is considered as part of the Multiple Touch Pattern.

Bit 2 - CS3_PTRN - Determines whether CS3 is considered as part of the Multiple Touch Pattern.

Bit 1 - CS2_PTRN - Determines whether CS2 is considered as part of the Multiple Touch Pattern.

Bit 0 - CS1_PTRN - Determines whether CS1 is considered as part of the Multiple Touch Pattern.

6.17

Recalibration Configuration Register

The Recalibration Configuration register controls the automatic re-calibration routine settings as well as advanced con-

trols to program the Sensor Input Threshold register settings.

Bit 7 - BUT_LD_TH - Enables setting all Sensor Input Threshold registers by writing to the Sensor Input 1 Threshold

• ‘0’ - Each Sensor Input X Threshold register is updated individually.

• ‘1’ (default) - Writing the Sensor Input 1 Threshold register will automatically overwrite the Sensor Input Threshold

registers for all sensor inputs (Sensor Input Threshold 1 through Sensor Input Threshold 8). The individual Sensor

TABLE 6-28:

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

TABLE 6-29:

RECALIBRATION CONFIGURATION REGISTERS

ADDR

R/W

Default

2Fh

R/W

Recalibration

Configuration

BUT_

LD_TH

NO_

CLR_

INTD

NO_

CLR_

NEG

NEG_DELTA_

CNT[1:0]

CAL_CFG[2:0]

8Ah

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