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參數(shù)資料
| 型號(hào)： | SX8658IWLTRT |
| 廠商： | Semtech |
| 文件頁(yè)數(shù)： | 22/61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： | SX8658IWLDKR |
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ADVANCED COMMUNICATIONS & SENSING
Rev 1 – 25
th July 2011
29
www.semtech.com
SX8657/SX8658
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 35 – ProxAvg vs Proximity Event
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