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| 型号： | KITMPR03XEVM |
| 厂商： | Freescale Semiconductor |
| 文件页数： | 8/33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 |
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MPR03X
Sensors
16
Freescale Semiconductor
7
Theory of Operation
7.1
Introduction
The MPR03X utilizes the principle that a capacitor holds a fixed amount of charge at a specific electric potential. Both the
implementation and the configuration will be described in this section.
7.2
Capacitance Measurement
The basic measurement technique used by the MPR03X is to charge up the capacitor C on one electrode input with a DC current
I for a time T (the charge time). Before measurement, the electrode input is grounded, so the electrode voltage starts from 0 V
and charges up with a slope, Equation 1, where C is the pad capacitance on the electrode (Figure 21). All of the other electrodes
are grounded during this measurement. At the end of time T, the electrode voltage is measured with a 10 bit ADC. The voltage
is inversely proportional to capacitance according to Equation 2
.The electrode is then discharged back to ground at the same
rate it was charged.
Equation 1
Equation 2
Figure 21. MPR03X Electrode Measurement Charging Pad Capacitance
When measuring capacitance there are some inherent restrictions due to the methodology used. On the MPR03X the voltage
after charging must be in the range that is shown in Figure 22.
Figure 22.
C
I
dt
dV
C
T
I
V
Electrode Charge Time
T
V
Electrode
Voltage
Electrode
Charging
Electrode
Discharging
Electrode voltage measured here
2T
Electrode Discharge Time
Valid ADC Values vs. VDD
0
100
200
300
400
500
600
700
800
900
1.71
1.91
2.11
2.31
2.51
2.71
VDD (V)
ADC
Counts
ADChigh
ADCmid
ADClow
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