參數(shù)資料
型號(hào)： CAP1014-1-EZK
廠商： STANDARD MICROSYSTEMS CORP
元件分類： 模擬信號(hào)調(diào)理
英文描述： SPECIALTY ANALOG CIRCUIT, QCC32
封裝： 5 X 5 MM, 0.50 MM PITCH, ROHS COMPLIANT, QFN-32
文件頁(yè)數(shù)： 36/73頁(yè)
文件大小： 945K
代理商： CAP1014-1-EZK
Multiple Channel Capacitive Touch Sensor and LED Driver
Datasheet
SMSC CAP1014
41
Revision 1.64 (01-15-09)
DATASHEET
5.12
Data Sensitivity Register
The Data Sensitivity register controls the sensitivity of a touch detection.
Bits 6- 4 D_DSP[2:0] - Controls the sensitivity of a touch detection. The sensitivity settings act to scale
the relative delta count value higher or lower based on the system parameters. A setting of 0000b is
the most sensitive while a setting of 1111b is the least sensitive. At the more sensitive settings, touches
are detected for a smaller delta C corresponding to a “l(fā)ighter” 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 sensitive 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).
Bits 3 - 0 - C_DSP[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 C_DSP[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 5.15 Data Scaling Register
ADDR
R/W
REGISTER
B7
B6
B5
B4
B3
B2
B1
B0
DEFAULT
1Fh
R/W
Data Sensitivity
-
D_DSP[2:0]
C_DSP[3:0]
2Fh
Table 5.16 D_DSP Bit Decode
D_DSP[2:0]
SENSITIVITY MULTIPLIER
210
0
128x (most sensitive)
001
64x
0
1
0
32x (default)
011
16x
100
8x
101
4x
110
2x
1
1x - (least sensitive)
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