th July 2011 15 www.semtech.com SX8654/SX8655/SX8656 H" />
參數(shù)資料
型號: SX8656IWLTRT
廠商: Semtech
文件頁數(shù): 7/62頁
文件大小: 0K
描述: IC TOUCH SCREEN 12BIT 20QFN
標(biāo)準(zhǔn)包裝: 1
類型: 電阻式,觸感驅(qū)動器
觸摸面板接口: 4,5 線
輸入數(shù)/鍵: 1 TSC,雨刷,鑰匙
分辨率(位): 12 b
評估套件: *
數(shù)據(jù)接口: I²C,串行
電壓基準(zhǔn): 內(nèi)部
電源電壓: 2.3 V ~ 3.6 V
工作溫度: -40°C ~ 85°C
安裝類型: 表面貼裝
封裝/外殼: 20-WFQFN 裸露焊盤
供應(yīng)商設(shè)備封裝: 20-QFN(4x4)
包裝: 標(biāo)準(zhǔn)包裝
其它名稱: SX8656IWLDKR
ADVANCED COMMUNICATIONS & SENSING
Rev 1 – 25
th July 2011
15
www.semtech.com
SX8654/SX8655/SX8656
Haptics Enabled 4/5-Wire
Resistive Touchscreen Controller with Proximity Sensing
4.2.2
5-wire Touchscreen
5-wire touchscreen coordinates measurement is performed similarly by biasing opposite corner pairs in either X
or Y directions on the lower panel, and converting the voltage appearing on the wiper panel with the ADC.
Figure 13 – 5-wire Touchscreen Coordinates Measurement
The X and Y positions output by the ADC correspond to the formulas below:
Xpos
4095
R2
R 1
R2
+
---------------------
=
Y pos
4095
R4
R 3
R4
+
---------------------
=
4095 corresponds to the max output value of the ADC (12 bits => 2
12 – 1).
For example, a touch in the center of the screen will output (Xpos, Ypos) = ~(2048, 2048)
4.3
Pressure Measurement (4-wire only)
The pressure measurement consists in extracting the touch resistance RT via two additional setups z1 and z2
illustrated below. The smaller RT, the more common touched surface there is between top and bottom plates
and hence the more “pressure” there is by the user.
Figure 14 – Pressure Measurement
The z1 and z2 values output by the ADC correspond to the formulas below:
z1
4095
R4
R1
R4
R
T
+
----------------------------------
=
z2
4095
R 4
Rt
+
R1
R4
R
T
+
----------------------------------
=
The X and Y total sheet resistance (Rxtot = R1+R2, Rytot = R3+R4) are known from the touch screen supplier.
R4 is proportional to the Y coordinate and its value is given by the total Y plate resistance Rytot multiplied by the
fraction of the Y position over the full coordinate range.
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