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CAP1298 Datasheet(PDF) 31 Page - Microchip Technology

Part # CAP1298
Description  8-Channel Capacitive Touch Sensor Controller with Proximity Detection & Signal Guard
PDF  68 Pages
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Manufacturer  MICROCHIP [Microchip Technology]
Direct Link  http://www.microchip.com
Logo MICROCHIP - Microchip Technology

CAP1298 Datasheet(HTML) 31 Page - Microchip Technology

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 2013-2015 Microchip Technology Inc.
DS00001571B-page 31
CAP1298
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
C 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 5-9:
DELTA_SENSE BIT DECODE
DELTA_SENSE[2:0]
Sensitivity Multiplier
210
0
0
0
128x (most sensitive)
001
64x
0
1
0
32x (default)
011
16x
100
8x
101
4x
110
2x
1
1
1
1x - (least sensitive)
TABLE 5-10:
BASE_SHIFT BIT DECODE
BASE_SHIFT[3:0]
Data Scaling Factor
32
1
0
00
0
0
1x
00
0
1
2x
00
1
0
4x
00
1
1
8x
01
0
0
16x
01
0
1
32x
01
1
0
64x
0
1
1
1
128x
1
0
0
0
256x
All others
256x
(default = 1111b)



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