th July 2011 13 www.semtech.com SX8657/SX8658 Haptics " />
參數(shù)資料
型號(hào)： SX8658IWLTRT
廠商： Semtech
文件頁(yè)數(shù)： 5/61頁(yè)
文件大?。?/td> 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(dòng)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(píng)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： SX8658IWLDKR
ADVANCED COMMUNICATIONS & SENSING
Rev 1 – 25
th July 2011
13
www.semtech.com
SX8657/SX8658
Haptics Enabled 4/5-Wire
Resistive Touchscreen Controller with Proximity Sensing
Higher reliability and better endurance are the advantages of 5-wire touchscreens but they do not allow pressure
measurement
Figure 9 – 5-wire Touchscreen
4.2
Coordinates Measurement
4.2.1
4-wire Touchscreen
The electrode plates are internally connected through terminals X+, X- and Y+, Y- to an analog to digital
converter (ADC) and a reference voltage (Vref). The resistance between the terminals X+ and X- is defined by
Rxtot. Rxtot will be split in 2 resistors, R1 and R2, in case the screen is touched. Similarly, the resistance
between the terminals Y+ and Y- is represented by R3 and R4. The connection between the top and bottom
sheet is represented by the touch resistance (RT).
In order to measure the Y coordinate, the top resistive sheet (Y) is biased with a voltage source (Vref). Resistors
R3 and R4 determine a voltage divider proportional to the Y position of the contact point. Since the converter has
a high input impedance, no current flows through R1 (and RT) so that the voltage X+ at the converter input is
given by the voltage divider created by R3 and R4.
The X coordinate is measured in a similar fashion with the bottom resistive sheet (X) biased to create a voltage
divider by R1 and R2, while the voltage on the top sheet is measured through R3.
The resistance RT is the resistance obtained when a pressure is applied on the screen. RT is created by the
contact area of the X and Y resistive sheet and varies with the applied pressure.
Figure 10 – 4-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)
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