th July 2011 26 www.semtech.com SX8654/SX8655/SX8656 H" />
參數(shù)資料
型號(hào)： SX8654IWLTRT
廠商： Semtech
文件頁數(shù)： 19/62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(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： SX8654IWLDKR
ADVANCED COMMUNICATIONS & SENSING
Rev 1 – 25
th July 2011
26
www.semtech.com
SX8654/SX8655/SX8656
Haptics Enabled 4/5-Wire
Resistive Touchscreen Controller with Proximity Sensing
5.2.3
Capacitance-to-Voltage Conversion (C-to-V)
PROXSENSORCON defines which pin will act as the sensor during proximity sensing operations. In the typical
case, the touchscreen top layer is used as the sensor (exact pin/electrode depends on screen type/structure).
Else, the sensor can also be “external”, i.e. connected to AUX2.
The sensitivity of the interface is defined by PROXSENSITIVITY; for obvious power consumption reasons it is
recommended to set it as low as possible.
As a last resort and only if the sensor is “external”, PROXBOOST can be set to allow higher sensitivity if needed.
PROXFREQ defines the operating frequency of the interface and should be set as high as possible for power
consumption reasons.
If needed, PROXHIGHIM enables a high noise immunity mode at the expense of increased power consumption.
5.2.4
Shield Control
PROXSHIELDCON defines which pin will act as the shield during proximity sensing operations. In the typical
case, the shield will usually be the touchscreen bottom layer (exact pin/electrode depends on screen
type/structure). Else, the shield can also be “external”, ie a simple copper area on the PCB connected to AUX3.
5.2.5
Offset Compensation
Offset compensation consists in performing a one time measurement of CEnv and subtracting it to the total
capacitance CSensor in order to feed the ADC with the closest contribution of CUser only.
Figure 31 – Offset Compensation Block Diagram
The ADC input CUser is the total capacitance CSensor to which CEnv is subtracted.
There are five possible compensation sources which are illustrated in the figure below. When set to 1 by any of
these sources, PROXCOMPSTAT will only be reset once the compensation is completed.
Figure 32 – Compensation Request Sources
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SX8655IWLTRT 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)
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
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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
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