CAP1006 datasheet(45/53 Pages) SMSC

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5 and 6 Channel Capacitive Touch Sensor

Datasheet

SMSC CAP1005 / CAP1006

Revision 1.1 (08-05-09)

DATASHEET

5.20

Standby Sensitivity Register

The Standby Sensitivity register controls the sensitivity for sensors that are active in Standby.

Bits 2 - 0 - STBY_SENSE[2:0] - Controls the sensitivity for sensors that are active in Standby. The

sensitivity settings act to scale the relative delta count value higher or lower based on the system

parameters. A setting of 000b is the most sensitive while a setting of 111b is the least sensitive. At the

more sensitive settings, touches are detected for a smaller delta C corresponding to a “lighter” touch.

These settings are more sensitive to noise however and a noisy environment may flag more false

touches than higher sensitivity levels.

APPLICATION NOTE: A value of 128x is the most sensitive setting available. At the most sensitivity settings, the

MSB of the Delta Count register represents 64 out of ~25,000 which corresponds to a touch

of approximately 0.25% of the base capacitance (or a

ΔC of 25fF from a 10pF base

capacitance). Conversely a value of 1x is the least sensitive setting available. At these

settings, the MSB of the Delta Count register corresponds to a delta count of 8192 counts

out of ~25,000 which corresponds to a touch of approximately 33% of the base capacitance

(or a

ΔC of 3.33pF from a 10pF base capacitance).

5.21

Standby Threshold Register

Table 5.33 Standby Configuration Register

ADDR

R/W

B5B4

B3B2

B1B0

DEFAULT

42h

R/W

Standby

Sensitivity

STBY_SENSE[2:0]

02h

Table 5.34 STBY_SENSE Bit Decode

STBY_SENSE[2:0]

SENSITIVITY MULTIPLIER

210

128x (most sensitive)

001

64x

32x (default)

011

16x

100

101

110

1x - (least sensitive)

Table 5.35 Standby Threshold Register

ADDR

R/W

DEFAULT

43h

R/W

Standby

Threshold

-64

40h

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