参数资料
型号: MPR031EPR2
厂商: Freescale Semiconductor
文件页数: 10/33页
文件大小: 0K
描述: IC CTLR TOUCH SENSOR 8-DFN
产品培训模块: MPR03x - Low-Power Proximity Sensors
特色产品: MPR03x Proximity Capacitive Touch Sensor Controllers
标准包装: 1
类型: 电容性
触摸面板接口: 2 线
评估套件: 可供
数据接口: I²C,串行
数据速率/采样率 (SPS,BPS): 400k
电源电压: 1.71 V ~ 2.75 V
电流 - 电源: 43µA
工作温度: -40°C ~ 85°C
安装类型: 表面贴装
封装/外壳: 8-UFDFN
供应商设备封装: 8-QFN-D(2x2)
包装: 标准包装
产品目录页面: 2808 (CN2011-ZH PDF)
配用: KITMPR03XEVM-ND - KIT EVAL FOR MPR03X
DEMOMPR031-ND - BOARD DEMO FOR MPR031 CTLR
其它名称: MPR031EPR2DKR
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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