th July 2011 20 www.semtech.com SX8657/SX8658 Haptics " />
參數(shù)資料
型號(hào)： SX8658IWLTRT
廠商： Semtech
文件頁(yè)數(shù)： 13/61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
ADVANCED COMMUNICATIONS & SENSING
Rev 1 – 25
th July 2011
20
www.semtech.com
SX8657/SX8658
Haptics Enabled 4/5-Wire
Resistive Touchscreen Controller with Proximity Sensing
Figure 21 – Pen Trigger Mode (RegIrqMsk[3:2] = 10 ; PROXSCANPERIOD = 0)
Please note that to prevent data loss, the next pen detection and conversion are not performed as long as all
current channel data (i.e. channels selected in RegChanMsk) have not been read. If the host is too slow and
doesn’t read all channel data before next TOUCHRATE tick, no operation is performed and this TOUCHRATE
tick is simply ignored until next one.
4.6.5
Maximum Throughput vs. TOUCHRATE setting
In PENTRG mode the TOUCHRATE parameter is used to define the required coordinate’s throughput/rate.
However, as previously mentioned, in order for a new conversion to be performed the current conversion must
be completed and all relevant channel data must have been read by the host. If this condition is not met when
the next TOUCHRATE tick occurs, the tick is ignored and the condition checked again at the next one. This will
result in reduced actual rate vs what has been programmed in the TOUCHRATE parameter.
This is illustrated in figures below.
Figure 22 – Correct TOUCHRATE setting
Idle
Touch Conversion
Pen Detection
NIRQ
Pen Touch
Pen Release
I2C Read Channel
PENSTAT
CONVSTAT
TOUCHRATE
tick
Idle
Touch Conversion
Pen Detection
NIRQ
TOUCHRATE
tick
I2C Read Channel
Tconv
Tcom
Trate
=
Tconv+Tcom < Trate
=> Actual rate = TOUCHRATE
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