th July 2011 17 www.semtech.com SX8654/SX8655/SX8656 H" />
參數資料
型號: SX8654IWLTRT
廠商: Semtech
文件頁數: 9/62頁
文件大小: 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/鍵: 1 TSC,雨刷,鑰匙
分辨率(位): 12 b
評估套件: *
數據接口: 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: SX8654IWLDKR
ADVANCED COMMUNICATIONS & SENSING
Rev 1 – 25
th July 2011
17
www.semtech.com
SX8654/SX8655/SX8656
Haptics Enabled 4/5-Wire
Resistive Touchscreen Controller with Proximity Sensing
Figure 15 – 4-wire Touchscreen Pen Detection
When using a 5-wire touchscreen, the pen detection pull-up resistor RPNDT and digital comparator continue to
monitor the X+/BR pin as in 4-wire mode. The top panel is grounded via the WIPER pin to provide the grounding
path for a screen touch event. When a touch occurs, a current path is created and will bring BR to the level
defined by the resistive divider determined by RPNDT and the sum of R1, RT and RW.
Figure 16 – 5-wire Touchscreen Pen Detection
RPNDT can be configured to 4 different values to accommodate different screen resistive values.
RPNDT should be set to a value greater than 7x(Rxtot + Rytot), it is recommended to set it to max value.
Pen detection uses a bias time of POWDLY/8 (digital comparator => less precision required vs analog
conversion). Increasing POWDLY can improve the detection on panels with high resistance.
A pen touch will set the PENSTAT bit of the RegStat register which will generate an interrupt if enabled in
RegIrqMsk.
A pen release will reset PENSTAT bit of the RegStat register which will generate an interrupt if enabled in
RegIrqMsk.
4.5
Digital Processing
The chip offers 4 types of data processing which allows the user to make trade-offs between data throughput,
power consumption and noise rejection.
The parameter FILT is used to select the filter order Nfilt. The noise rejection will be improved with a high order
to the detriment of power consumption. Each channel can be sampled up to 7 times and then processed to get a
single consolidated coordinate.
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