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參數(shù)資料
| 型號： | SX8658IWLTRT |
| 廠商： | Semtech |
| 文件頁數(shù)： | 29/61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
35
www.semtech.com
SX8657/SX8658
Haptics Enabled 4/5-Wire
Resistive Touchscreen Controller with Proximity Sensing
6
HAPTICS INTERFACE (SX8657/58)
6.1
Introduction
Haptics technology is commonly used in systems which include a touchscreen interface. Its purpose is to provide
tactile feedback to the user to acknowledge a touch event hence improving greatly the robustness of the system
and user comfort and perception.
The on-chip haptics interface is designed to drive two common actuator types: Eccentric Rotating Mass (ERM)
and Linear Resonant Actuator (LRA). This is performed without any external component due to fully embedded
analog processing and with very limited host interaction due to the embedded digital processing block.
Figure 45 – Haptics Interface Overview
The host configures drive parameters from the I2C port according to the particular haptics load to be used. The
haptics drive level is then controlled in real time by either of two methods: by a dedicated digital pin, MIN, which
accepts a pulse-width-modulated (PWM) digital signal; or by writing the desired output level directly to a register
via the I2C interface.
This digital information is filtered to prevent fast transitions and hence high current spikes (HAPTBW), converted
into the analog domain by an 8-bit DAC, and finally amplified (HAPTGAIN) to provide a differential signal
between MOUTP and MOUTN pins which can be directly connected to the motor thanks to their high drive
current capability.
For better isolation from the rest of the chip, the haptics interface analog block has its own power supply pins
MVDD and MGND.
The haptics interface is enabled when HAPTTYPEEN != 0.
6.2
ERM Load
6.2.1
Introduction
An ERM is a DC motor with an off-balance load to create a vibration. Speed and direction are controlled by the
applied voltage. The ERM load is selected when HAPTTYPEEN = 10.
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