5 and 6 Channel Capacitive Touch Sensor
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).
Table 5.7 DELTA_SENSE Bit Decode
DELTA_SENSE[2:0]
2
1
0
SENSITIVITY MULTIPLIER
0
0
0
0
1
1
1
1
0
0
1
1
0
0
1
1
0
1
0
1
0
1
0
1
128x (most sensitive)
64x
32x (default)
16x
8x
4x
2x
1x - (least sensitive)
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 5.8 BASE_SHIFT Bit Decode
BASE_SHIFT[3:0]
DATA SCALING
3
2
1
0
FACTOR
0
0
0
0
0
0
0
0
1
0
0
0
0
1
1
1
1
0
0
0
1
1
0
0
1
1
0
0
1
0
1
0
1
0
1
0
1x
2x
4x
8x
16x
32x
64x
128x
256x
256x
(default = 1111b)
All others
Revision 1.1 (08-05-09)
SMSC CAP1005 / CAP1006
DATA3S2HEET
SMSC [ SMSC CORPORATION ]
