th July 2011 14 www.semtech.com SX8657/SX8658 Haptics " />
參數(shù)資料
型號： SX8657IWLTRT
廠商： Semtech
文件頁數(shù)： 6/61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： SX8657IWLDKR
ADVANCED COMMUNICATIONS & SENSING
Rev 1 – 25
th July 2011
14
www.semtech.com
SX8657/SX8658
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 11 – 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 12 – 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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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
SX8658ICSTRT 制造商:SEMTECH 制造商全稱:Semtech Corporation 功能描述:Haptics Enabled 4/5-Wire Resistive Touchscreen Controller with Proximity Sensing
SX8658IWLTRT 功能描述:IC TOUCH SCREEN 12BIT 20QFN RoHS:是 類別:集成電路 (IC) >> 數(shù)據(jù)采集 - 觸摸屏控制器 系列:- 標(biāo)準(zhǔn)包裝:96 系列:- 類型:- 觸摸面板接口:- 輸入數(shù)/鍵:- 分辨率（位）:- 評估套件:* 數(shù)據(jù)接口:- 數(shù)據(jù)速率/采樣率 (SPS，BPS):- 電壓基準(zhǔn):- 電源電壓:- 電流 - 電源:- 工作溫度:- 安裝類型:表面貼裝 封裝/外殼:16-TSSOP（0.173"，4.40mm 寬） 供應(yīng)商設(shè)備封裝:16-TSSOP 包裝:帶卷 (TR)
SX8660 制造商:SEMTECH 制造商全稱:Semtech Corporation 功能描述:Ultra Low Power, Capacitive Button Touch Controller (8 sensors) with Enhanced LED Drivers and Analog Output
SX8660I06AULTRT 制造商:Semtech Corporation 功能描述:Touch Controller with Enhanced LED Drivers 28-Pin MLPQ-UT EP T/R 制造商:Semtech Corporation 功能描述:TOUCH SCREEN CONTROLLER 制造商:Semtech Corporation 功能描述:IC CAP BUTTON TOUCH PROXIMITY CTRL MLP 制造商:Semtech Corporation 功能描述:SX8660 Series 3.6 V Ultra Low Power Capacitive Button Touch Controller-MLPQ-UT28 制造商:Semtech Corporation 功能描述:IC, CAP BUTTON TOUCH PROXIMITY CTRL, MLPQ-28; Controller Type:Capacitive Touch Screen; IC Interface Type:I2C; Supply Voltage Min:2.7V; Supply Voltage Max:3.6V; Digital IC Case Style:MLPQ; No. of Pins:28; No. of Channels:8 制造商:Semtech Corporation 功能描述:IC, CAP BUTTON TOUCH CTRL, 8 SENSOR, MLPQ-28; Controller Type:Capacitive Touch Screen; IC Interface Type:I2C; Supply Voltage Min:2.7V; Supply Voltage Max:3.6V; Digital IC Case Style:MLPQ; No. of Pins:28; No. of Channels:8 制造商:SEMTECH 功能描述:Sensor
SX8660I06YULTRT 制造商:Semtech Corporation 功能描述:Sensor
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