th July 2011 25 www.semtech.com SX8654/SX8655/SX8656 H" />
參數(shù)資料
型號(hào)： SX8654IWLTRT
廠商： Semtech
文件頁(yè)數(shù)： 18/62頁(yè)
文件大?。?/td> 0K
描述： IC TOUCH SCREEN 12BIT 20QFN
標(biāo)準(zhǔn)包裝： 1
類(lèi)型： 電阻式，觸感驅(qū)動(dòng)器
觸摸面板接口： 4，5 線(xiàn)
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(lèi)型： 表面貼裝
封裝/外殼： 20-WFQFN 裸露焊盤(pán)
供應(yīng)商設(shè)備封裝： 20-QFN（4x4）
包裝： 標(biāo)準(zhǔn)包裝
其它名稱(chēng)： SX8654IWLDKR
ADVANCED COMMUNICATIONS & SENSING
Rev 1 – 25
th July 2011
25
www.semtech.com
SX8654/SX8655/SX8656
Haptics Enabled 4/5-Wire
Resistive Touchscreen Controller with Proximity Sensing
The challenge of capacitive sensing is to detect this relatively small variation of CSensor (CUser usually contributes
for a few percents only) and differentiate it from environmental noise (CEnv also slowly varies together with the
environment characteristics like temperature, etc). For this purpose, the chip integrates an auto offset
compensation mechanism which dynamically monitors and removes the CEnv component to extract and process
CUser only. See §5.2.5 for more details.
In first order, CUser can be estimated by the formula below:
A is the common area between the two electrodes hence the common area between the user’s finger/palm/face
and the sensor.
d is the distance between the two electrodes hence the proximity distance between the user and the system.
0
ε
is the free space permittivity and is equal to 8.85 10e-12 F/m (constant)
r
ε
is the dielectric relative permittivity.
When performing proximity sensing the dielectric relative permittivity is roughly equal to that of the air as the
overlay is relatively thin compared to the detection distance targeted. Typical permittivity of some common
materials is given in the table below.
Material
Typical
r
ε
Glass
8
FR4
5
Acrylic Glass
3
Wood
2
Air
1
From the discussions above we can conclude that the most robust and efficient design will be the one that
minimizes CEnv value and variations while improving CUser.
5.2.2
AFE Block Diagram
Figure 30 – Analog Front-End Block Diagram
d
A
ε
C
r
User
0
=
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SX8655ICSTRT 制造商:SEMTECH 制造商全稱(chēng):Semtech Corporation 功能描述:Haptics Enabled 4/5-Wire Resistive Touchscreen Controller with Proximity Sensing
SX8655IWLTRT 功能描述:IC TOUCH SCREEN 12BIT 20QFN RoHS:是 類(lèi)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(lèi)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(lèi)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)
SX8656ICSTRT 制造商:SEMTECH 制造商全稱(chēng):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(lèi)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(lèi)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(lèi)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(chēng):Semtech Corporation 功能描述:Haptics Enabled 4/5-Wire Resistive Touchscreen Controller with Proximity Sensing
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