th July 2011 30 www.semtech.com SX8654/SX8655/SX8656 H" />
參數(shù)資料
型號(hào): SX8656IWLTRT
廠商: Semtech
文件頁數(shù): 24/62頁
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: SX8656IWLDKR
ADVANCED COMMUNICATIONS & SENSING
Rev 1 – 25
th July 2011
30
www.semtech.com
SX8654/SX8655/SX8656
Haptics Enabled 4/5-Wire
Resistive Touchscreen Controller with Proximity Sensing
5.3.4
PROXAVG Update
PROXAVG update consists in averaging PROXUSEFUL to ignore its “fast” variations (i.e. user finger/palm/hand)
and extract only the very slow variations of environment capacitance CEnv.
One can program positive and negative debounced thresholds (PROXAVGPOSTHRESH/PROXAVGPOSDEB
and PROXAVGNEGTHRESH/PROXAVGNEGDEB) within which PROXAVG can vary without triggering
compensation (ie small acceptable environment drift).
Large positive values of PROXUSEFUL are considered as normal (user finger/hand/head) but large negative
values are considered abnormal and should be compensated quickly. For this purpose, the averaging filter
coefficient can be set independently for positive and negative variations via PROXAVGPOSFILT and
PROXAVGNEGFILT. Typically we have PROXAVGPOSFILT > PROXAVGNEGFILT to filter out (abnormal)
negative events faster.
To prevent PROXAVG to be “corrupted” by user activity (should only reflect environmental changes) it is freezes
when proximity is detected.
Figure 37 – ProxAvg vs Proximity Event
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