参数资料
| 型号： | MPR031EPR2 |
| 厂商： | Freescale Semiconductor |
| 文件页数： | 9/33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 |
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MPR03X
Sensors
Freescale Semiconductor
17
The valid operating range of the electrode charging source is 0.7V to (VDD-.7)V. This means that for a given VDD the valid ADC
(voltage visible to the digital interface) range is given by
,
Equation 3
and
.
Equation 4
These equations are represented in the graph. In the nominal case of VDD = 1.8V the ADC range is shown below in Table 10.
Any ADC counts outside of the range shown are invalid and settings must be adjusted to be within this range. If capacitance
variation is of importance for an application after the current output, charge time and supply voltage are determined then the
following equations can be used. The valid range for capacitance is calculated by using the minimum and maximum ADC values
in the capacitance equation. Substituting the low and high ADC equations into the capacitance equation yields the equations for
the minimum and maximum capacitance values which are
and
.
Equation 5
7.3
Sensitivity
The sensitivity of the MPR03X is relative to the capacitance range being measured. Given the ADC value, current and time
settings capacitance can be calculated,
.
Equation 6
For a given capacitance the sensitivity can be measured by taking the derivative of this equation. The result of this is the
following equation, representing the change in capacitance per one ADC count, where the ADC in the equation represents the
current value.
Equation 7
This relationship is shown in the following graph by taking the midpoints off all possible ranges by varying the current and time
settings. The midpoint is assumed to be 512 for ADC and the nominal supply voltage of 1.8V is used.
Table 10.
VDD
ADChigh
ADClow
ADCmid
1.8
625.7778
398.2222
512
1024
7
.
DD
low
V
ADC
1024
7
.
DD
high
V
ADC
7
.
DD
low
V
T
I
C
7
.
T
I
C
high
ADC
V
T
I
C
DD
1024
2
1024
ADC
V
T
I
dADC
dC
DD
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相关代理商/技术参数 |
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|---|---|
| MPR031EPR2 | 制造商:Freescale Semiconductor 功能描述:IC CAPACITIVE TOUCH SENSOR FN-8 |
| MPR031EPR2-CUT TAPE | 制造商:Freescale 功能描述:MPR031 Series 2.75 V 8 ? Proximity Capacitive Touch Sensor Controller - UDFN-8 |
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| MPR032EPR2 | 功能描述:电容触摸传感器 DFN TOUCH PAD RoHS:否 制造商:Microchip Technology 电源电压: 通道数量: 封装 / 箱体: 尺寸: 温度范围: |
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