CAP1214 datasheet(49/107 Pages) MICROCHIP

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Multiple Channel Capacitive Touch Sensor and LED Driver

Datasheet

SMSC CAP1214

Revision 1.0 (08-30-10)

DATASHEET

The value presented is a standard 2’s complement number. In addition, the value is capped at a value

of 7Fh. A reading of 7Fh indicates that the sensitivity settings are too high and should be adjusted

accordingly (see Section 6.13).

The value is also capped at a negative value of FFh for negative delta counts which may result upon

a release.

6.12

Queue Control Register

The Queue Control Register determines the number of consecutive samples for which a single sensor

output is above the Sensor Threshold before a touch is detected. This is also used to determine the

number of consecutive samples used to detect a button release. The queue applies independently to

all channels. This register also determines how the noise status bits affect some data.

Bit 5 - NO_CLR_INTD - Controls whether the accumulation of intermediate data is cleared if the noise

status bit is set.

‘0’ (default) - The accumulation of intermediate data is cleared if the noise status bit is set.

‘1’ - The accumulation of intermediate data is not cleared if the noise status bit is set.

APPLICATION NOTE: Bits 4 and 5 should both be set to the same value. Either both should be set to ‘0’ or both

should be set to ‘1’.

Bit 4 - NO_CLR_NEG - Controls whether the consecutive negative delta counts counter is cleared if

the noise status bit is set.

‘0’ (default) - The consecutive negative delta counts counter is cleared if the noise status bit is set.

‘1’ - The consecutive negative delta counts counter is not cleared if the noise status bit is set.

Bits 2 - 0 - QUEUE_B[2:0] - The number of consecutive samples necessary to detect a touch. Default

is 3 consecutive samples. See Table 6.15.

Table 6.14 Queue Control Register

ADDR

R/W

DEFAULT

1Eh

R/W

Queue Control

NO_

CLR_

INTD

NO_

CLR_

NEG

QUEUE_B[2:0]

03h

Table 6.15 QUEUE_B Bit Decode

QUEUE_B[2:0]

NUMBER OF CONSECUTIVE

READINGS > THRESHOLD

3 (default)

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