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| 型號： | SX8657IWLTRT |
| 廠商： | Semtech |
| 文件頁數(shù)： | 5/61頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC TOUCH SCREEN 12BIT 20QFN |
| 標準包裝： | 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： | 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： | 標準包裝 |
| 其它名稱： | SX8657IWLDKR |
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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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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:- 標準包裝: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:- 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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