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| 型号： | MPR084QR2 |
| 厂商： | Freescale Semiconductor |
| 文件页数： | 18/40页 |
| 文件大小： | 0K |
| 描述： | IC CTLR TOUCH SENSOR PROX 16-QFN |
| 标准包装： | 2,500 |
| 类型： | 电容性 |
| 输入数/键： | 8 键 |
| 评估套件： | 可供 |
| 数据接口： | I²C，串行 |
| 电源电压： | 1.8 V ~ 3.6 V |
| 电流 - 电源： | 1.62mA |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 16-VQFN 裸露焊盘 |
| 供应商设备封装： | 16-QFN-EP（5x5） |
| 包装： | 带卷 (TR) |
| 配用： | KITMPR084EVM-ND - KIT EVAL 8-PAD TOUCH MPR084 |
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MPR084
Sensors
Freescale Semiconductor
25
9
Sensitivity
9.1
Introduction
The MPR084 can operate in a variety of environments with a variety of different electrode patterns. Because of this it is necessary
to adjust the relative sensitivity of the sensor controller. Usually this requires fine tuning in any final application.
There are many factors that must be taken into account, but much of the time this value is relative to the capacitance changes
generated by a touch. Since capacitance is directly proportional to the dielectric constant of the material and the area of the pad,
while inversely proportional to the distance between pads these are the primary factors.
Equation 8
As the relative capacitance rises the sensitivity setting of the MPR084 should be adjusted accordingly. Thus a very high sensitivity
value represents a large A and a small d.
9.2
Adjusting the Sensitivity
The sensitivity of the MPR084 is adjusted by varying the Sensitivity Threshold Registers.
9.2.1
Sensitivity Threshold Registers
The Sensitivity Threshold registers all sensitivity of the MPR084 to be adjusted for any situation. The I2C slave address of the
Sensitivity Threshold Registers is 0x04 - 0x0B.
Figure 28. Sensitivity Threshold Register Format
7
6
543210
R
SL
W
Reset:
0
000000
= Unimplemented
Table 17. Sensitivity Threshold Register Format Descriptions
Field
Description
7:0
ST
Sensitivity Threshold – The Sensitivity Threshold selects or reports the sensitivity
setting of the Sensor Controller. The resulting value must be in the range 1 to 64
units. If the value is outside of this range the ST will be set to 00111111.
00000000 Encoding 0 – Sets the sensitivity to level 1
~
00111111 Encoding 63 – Sets the sensitivity to level 64
C
ke0A
d
------------
=
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