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| 型号： | KITMPR083EVM |
| 厂商： | Freescale Semiconductor |
| 文件页数： | 15/35页 |
| 文件大小： | 0K |
| 描述： | KIT EVAL 8POSITION ROTARY TOUCH |
| 标准包装： | 1 |
| 传感器类型： | 触摸，电容式 |
| 传感范围： | 8 个按钮/键 |
| 接口： | I²C |
| 电源电压： | 1.8 V ~ 3.6 V |
| 嵌入式： | 是，其它 |
| 已供物品： | 板，缆线，CD |
| 已用 IC / 零件： | MPR083 |
| 相关产品： | MPR083EJR2CT-ND - IC CTLR TOUCH SENSR PROX 16TSSOP MPR083QR2-ND - IC CTLR TOUCH SENSOR PROX 16-QFN MPR083Q-ND - IC CTLR TOUCH SENSOR PROX 16-QFN MPR083EJR2TR-ND - IC CTLR TOUCH SENSR PROX 16TSSOP MPR083EJ-ND - IC CTLR TOUCH SENSR PROX 16TSSOP |
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MPR083
Sensors
22
Freescale Semiconductor
9
Sensitivity
9.1
Introduction
The MPR083 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 MPR083 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 MPR083 is adjusted by varying the Sensitivity Threshold Register.
9.2.1
Sensitivity Threshold Register
The sensitivity register allows the sensitivity of the MPR083 to be adjusted for any situation. The I2C slave address of the
Sensitivity Threshold Register is 0x04.
Figure 26. Sensitivity Threshold Register
7
6
543210
R
SL
W
Reset:
0
000000
= Unimplemented
Table 16. Sensitivity Threshold Register Field 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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