参数资料
型号: KITMPR03XEVM
厂商: Freescale Semiconductor
文件页数: 10/33页
文件大小: 0K
描述: KIT EVAL FOR MPR03X
产品培训模块: MPR03x - Low-Power Proximity Sensors
视频文件: KITMPR03XEVM
标准包装: 1
传感器类型: 触摸,电容式
接口: I²C
电源电压: 1.71 V ~ 2.75 V
嵌入式: 是,其它
已供物品: 4 个板,线缆,CD,样品 IC
已用 IC / 零件: MPR031
产品目录页面: 2808 (CN2011-ZH PDF)
相关产品: MPR031EPR2DKR-ND - IC CTLR TOUCH SENSOR 8-DFN
MPR031EPR2CT-ND - IC CTLR TOUCH SENSOR 8-DFN
MPR031EPR2TR-ND - IC CTLR TOUCH SENSOR 8-DFN
MPR03X
Sensors
18
Freescale Semiconductor
Figure 23.
Smaller amounts of change indicate increased sensitivity for the capacitance sensor. Some sample values are shown in Table 11.
In the above cases, the capacitance is assumed to be in the middle of the range for specific settings. Within the capacitance
range the equation is nonlinear, thus the sensitivity is best with the lowest capacitance. This graph shows the sensitivity derivative
reading across the valid range of capacitances for a set I, T, and VDD. For simple small electrodes (that are approximately
21 pF) and a nominal 1.8V supply the following graph is representative of this effect.
Figure 24.
Table 11.
pF
Sensitivity (pF/ADC count)
10
-0.01953
100
-0.19531
Sensitivity vs. Midpoint Capacitance for VDD =1.8V
-5
-4.5
-4
-3.5
-3
-2.5
-2
-1.5
-1
-0.5
0
500
1000
1500
2000
2500
Midpoint Capacitance (pF)
S
ens
iti
vi
ty
(pF/
A
D
C
Count
)
dC/dADC @cmid (pF/1 ADC Count)
0
Sensitivity vs. Capacitance for VDD =1.8Vand I=36 μA and T=.5 μS
0
0.01
0.02
0.03
0.04
0.05
0.06
0.07
0.08
0.09
0.1
10
12
14
16
18
20
22
24
26
28
30
Se
ns
itiv
ity
(pF/A
D
C
ount
)
Maximum
Minimum
C/ADC
Capacitance
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