th July 2011 36 www.semtech.com SX8657/SX8658 Haptics " />
參數(shù)資料
型號： SX8657IWLTRT
廠商： Semtech
文件頁數(shù)： 30/61頁
文件大?。?/td> 0K
描述： IC TOUCH SCREEN 12BIT 20QFN
標準包裝： 1
類型： 電阻式，觸感驅動器
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： 內部
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
供應商設備封裝： 20-QFN（4x4）
包裝： 標準包裝
其它名稱： SX8657IWLDKR
ADVANCED COMMUNICATIONS & SENSING
Rev 1 – 25
th July 2011
36
www.semtech.com
SX8657/SX8658
Haptics Enabled 4/5-Wire
Resistive Touchscreen Controller with Proximity Sensing
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Figure 46 – ERM Drive Signal Example
If AmplitudeCode is within HAPTSQUELCH range (for more than 512/MIN_Freq in PWM mode, for more than
512/FOSCL in I2C mode):
VMOUT = 0V
Else:
VMOUT(V) = (AmplitudeCode / 127) x 1.135 * HAPTGAIN
AmplitudeCode (signed) is defined differently depending on the mode selected (PWM or I2C), see below.
Please note that whatever setting, VMOUT is physically limited to [MVDD;-MVDD], i.e. saturation effect.
6.2.2
PWM Mode
PWM mode is selected when HAPTMODE = 0.
In this mode, AmplitudeCode is extracted/updated at each MIN period from MIN_DutyCycle:
MIN_DutyCycle
≈ 0% => AmplitudeCode = -127
…
MIN_DutyCycle = 49.6% => AmplitudeCode = -1
MIN_DutyCycle = 50% => AmplitudeCode = 0
MIN_DutyCycle = 50.4% => AmplitudeCode = +1
…
MIN_DutyCycle
≈ 100% => AmplitudeCode = +127
6.2.3
I2C Mode
I2C mode is selected when HAPTMODE = 1.
In this mode, AmplitudeCode = HAPTAMP (signed, internally sampled at FOSCL). MIN is not used and should
be grounded. HAPTRANGE must be set to 1.
6.3
LRA Load
6.3.1
Introduction
An LRA is a spring and mass with an electro-magnetic coil to move the mass. It is operated by applying an AC
signal at its resonant frequency (typ. ~175 Hz). Like pushing a swing at its resonance, it doesn’t need much
energy to keep it going, so drive current requirements are much lower than for ERMs. LRAs have moderately
high Q factors so that the drive frequency must match the resonant frequency within a few Hz to get optimum
amplitude.
LRA load is selected when HAPTTYPEEN = 01.
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