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| 型號： | SX8657IWLTRT |
| 廠商： | Semtech |
| 文件頁數(shù)： | 15/61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
22
www.semtech.com
SX8657/SX8658
Haptics Enabled 4/5-Wire
Resistive Touchscreen Controller with Proximity Sensing
5
PROXIMITY SENSING INTERFACE (SX8657)
5.1
Introduction
The purpose of the proximity sensing interface is to detect when a conductive object (usually a body part i.e.
finger, palm, face, etc) is in the proximity of the system. This is commonly used in power-sensitive mobile
applications to turn the screen’s LCD ON/OFF depending on user’s finger/palm/face proximity.
The chip’s proximity sensing interface is based on capacitive sensing technology and shares the ADC with the
touchscreen interface (Cf §5.4.2). An overview is given in figure below.
Shield
Sensor
Analog
Front-End
(AFE)
Digital
Processing
SX8657
PROXSTAT
0
1
0
Finger, palm,
face, etc
Figure 24 – Proximity Sensing Interface Overview
The sensor can be the top layer of the touchscreen or a simple copper area on the PCB (programmable
in PROXSENSORCON). Its capacitance (to ground) will vary when a conductive object is moving in its
proximity.
The optional shield can be the bottom layer of the touchscreen or a simple copper area on the PCB
(programmable in PROXSHIELDCON) below/under/around the sensor. It is used to protect the sensor
against potential surrounding noise sources and improve its global performance. It also brings directivity
to the sensing, for example sensing objects approaching from top only.
The analog front-end (AFE) performs the raw sensor’s capacitance measurement and converts it into a
12 bit digital code. It also controls the shield. See §5.2 for more details.
The digital processing block computes the raw capacitance measurement from the AFE and extracts a
binary information PROXSTAT corresponding to the proximity status, i.e. object is “Far” or “Close”. It
also triggers AFE operations (compensation, etc). See §5.3 for more details.
To save power since the proximity event is slow by nature, the block will be waken-up regularly at every
programmed scan period (PROXSCANPERIOD) to sense and then process a new proximity sample. The block
will be in idle mode most of the time. This is illustrated in figure below
Figure 25 – Proximity Sensing Sequencing
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| 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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