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參數(shù)資料
| 型號： | SX8658IWLTRT |
| 廠商： | Semtech |
| 文件頁數(shù)： | 19/61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： | SX8658IWLDKR |
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ADVANCED COMMUNICATIONS & SENSING
Rev 1 – 25
th July 2011
26
www.semtech.com
SX8657/SX8658
Haptics Enabled 4/5-Wire
Resistive Touchscreen Controller with Proximity Sensing
Block startup: a compensation is automatically requested when the proximity sensing is enabled via
PROXSCANPERIOD.
I2C: a compensation can be manually requested anytime by the host through I2C interface.
PROXAVG update: a compensation can be automatically requested if it is detected that CEnv has drifted
beyond a set level since the last compensation.
PROXCOMPPRD: a compensation can be automatically requested at a predefined rate programmed by
the host.
PROXSTUCK: a compensation can be automatically requested if it is detected that the proximity “Close”
state is lasting abnormally long.
Please note that the compensation request flag can be set anytime but the compensation itself is always done at
the beginning of a scan period to keep all parameters coherent (PROXRAW, PROXAVG, PROXDIFF), see
§5.3.2.
5.2.6
Analog-to-Digital Conversion (ADC)
A 12-bit ADC is used to convert the capacitance information into a digital 12-bit word PROXRAW.
The ADC is shared with the touchscreen interface using time multiplexing (see §5.4.2 for more details).
5.3
Digital Processing
5.3.1
Overview
The main purpose of the digital processing block is to convert the raw capacitance information coming from the
AFE (PROXRAW) into a robust and reliable digital flag (PROXSTAT) indicating if the user’s finger/hand/head is
close to the proximity sensor.
The offset compensation performed in the AFE is a one time measurement. However, the environment
capacitance CEnv may vary with time (temperature, nearby objects, etc). Hence, in order to get the best
estimation of CUser (PROXDIFF) it is needed to dynamically track and subtract CEnv variations. This is performed
by filtering PROXUSEFUL to extract its slow variations (PROXAVG).
PROXDIFF is then compared to user programmable threshold to extract PROXSTAT flag.
Figure 31 – Digital Processing Block Diagram
Digital processing sequencing is illustrated in figure below. At every scan period wake-up (defined by
PROXSCANPERIOD), the block updates sequentially PROXRAW, PROXUSEFUL, PROXAVG, PROXDIFF and
PROXSTAT before going back to Idle mode.
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