CAP1005 datasheet(32/53 Pages) SMSC

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5 and 6 Channel Capacitive Touch Sensor

Datasheet

Revision 1.1 (08-05-09)

SMSC CAP1005 / CAP1006

DATASHEET

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).

Bits 3 - 0 - BASE_SHIFT[3:0] - Controls the scaling and data presentation of the Base Count registers.

The higher the value of these bits, the larger the range and the lower the resolution of the data

presented. The scale factor represents the multiplier to the bit-weighting presented in these register

descriptions.

APPLICATION NOTE: The BASE_SHIFT[3:0] bits normally do not need to be updated. These settings will not affect

touch detection or sensitivity. These bits are sometimes helpful in analyzing the Cap Sensing

board performance and stability.

Table 5.7 DELTA_SENSE Bit Decode

DELTA_SENSE[2:0]

SENSITIVITY MULTIPLIER

210

128x (most sensitive)

001

64x

32x (default)

011

16x

100

101

110

1x - (least sensitive)

Table 5.8 BASE_SHIFT Bit Decode

BASE_SHIFT[3:0]

DATA SCALING

FACTOR

16x

32x

64x

128x

256x

All others

256x

(default = 1111b)

CAP1005 Datasheet(PDF) 32 Page - SMSC Corporation

CAP1005 Datasheet(HTML) 32 Page - SMSC Corporation

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