Datasheet

8 Channel Capacitive Touch Sensor with 8 LED Drivers
Datasheet
Revision 1.32 (01-05-12) 46 SMSC CAP1188
DATASHEET
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.
0 0 1 64x
0 1 0 32x (default)
0 1 1 16x
1 0 0 8x
1 0 1 4x
1 1 0 2x
1 1 1 1x - (least sensitive)
Table 5.9 BASE_SHIFT Bit Decode
BASE_SHIFT[3:0]
DATA SCALING
FACTOR3 2 1 0
0 0 0 0 1x
0 0 0 1 2x
0 0 1 0 4x
0 0 1 1 8x
0 1 0 0 16x
0 1 0 1 32x
0 1 1 0 64x
0 1 1 1 128x
1 0 0 0 256x
All others
256x
(default = 1111b)
Table 5.8 DELTA_SENSE Bit Decode (continued)
DELTA_SENSE[2:0]
SENSITIVITY MULTIPLIER2 1 0