參數(shù)資料
型號(hào)： MPR083Q
廠商： Freescale Semiconductor
文件頁(yè)數(shù)： 15/35頁(yè)
文件大小： 0K
描述： IC CTLR TOUCH SENSOR PROX 16-QFN
產(chǎn)品培訓(xùn)模塊： Sensor Toolbox
產(chǎn)品目錄繪圖： MPR08(3,4)Q Top
標(biāo)準(zhǔn)包裝： 490
類型： 電容性
輸入數(shù)/鍵： 8 個(gè)滑塊
評(píng)估套件： 可供
數(shù)據(jù)接口： I²C，串行
電源電壓： 1.8 V ~ 3.6 V
電流 - 電源： 1.62mA
工作溫度： -40°C ~ 85°C
安裝類型： 表面貼裝
封裝/外殼： 16-VQFN 裸露焊盤
供應(yīng)商設(shè)備封裝： 16-QFN-EP（5x5）
包裝： 散裝
產(chǎn)品目錄頁(yè)面： 2808 (CN2011-ZH PDF)
配用： DEMOMPR083-ND - BOARD DEMO FOR MPR083 CTLR
KITMPR083EVM-ND - KIT EVAL 8POSITION ROTARY TOUCH
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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