th July 2011 23 www.semtech.com SX8654/SX8655/SX8656 H" />
參數(shù)資料
型號(hào)： SX8655IWLTRT
廠商： Semtech
文件頁(yè)數(shù)： 16/62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： SX8655IWLDKR
ADVANCED COMMUNICATIONS & SENSING
Rev 1 – 25
th July 2011
23
www.semtech.com
SX8654/SX8655/SX8656
Haptics Enabled 4/5-Wire
Resistive Touchscreen Controller with Proximity Sensing
5
PROXIMITY SENSING INTERFACE (SX8654/56)
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
SX8654/56
PROXSTAT
0
1
0
Finger, palm,
face, etc
Figure 26 – 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 27 – Proximity Sensing Sequencing
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參數(shù)描述
SX8656ICSTRT 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
SX8656IWLTRT 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(píng)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)
SX8657 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
SX8657ICSTRT 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
SX8657IWLTRT 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(píng)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)
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