參數(shù)資料
型號: AK4673EG
廠商: Asahi Kasei Microsystems Co.,Ltd
元件分類: Codec
英文描述: Stereo CODEC with MIC/HP-AMP and Touch Screen Controller
中文描述: 立體聲編解碼器麥克風(fēng)/惠普- AMP及觸摸屏控制器
文件頁數(shù): 71/107頁
文件大?。?/td> 1171K
代理商: AK4673EG
[AK4673]
MS0670-E-00
2007/09
- 71 -
The Pen Pressure Measurement
The touch screen pen pressure can be derived from the measurement of the contact resistor between two plates. The
contact resistance depends on the size of the depressed area and the pressure. The area of the spot is proportional to the
contact resistance. This resistance (Rtouch) can be calculated using two different methods.
The first method is applied when the total resistance of the X-plate sheet is already known. The resistance, Rtouch, is
calculated from the results of three conversions, X-position, Z1-Position, and Z2-Position, and then using the following
formula:
Rtouch = (Rxplate) * (Xposition/4096) * [(Z2/Z1) – 1]
The second method is applied when both the resistances of the X-plate and Y-plate are known. The resistance, Rtouch, is
calculated from the results of three conversions, X-position, Y-Position, and Z1-Position, and then using the following
formula:
Rtouch = (Rxplate*Xposition/4096)*[(4096/Z1) – 1] – Ryplate*[1 – (Yposition/4096)]
TSVDD
XN-Driver SWON
YN
VREF+
VREF-
ADC
AIN+
AIN-
XP
YP
XN
YP-Driver SW ON
a) Z1-Position Measurement
Rtouch
XN-Driver SW ON
YN
VREF+
VREF-
ADC
AIN+
AIN-
XP
YP
XN
YP-Driver SW ON
b) Z2-Position Measurement
Rtouch
TSVDD
Figure 64 Pen Pressure Measurements
相關(guān)PDF資料
PDF描述
AK4682 Multi-channel CODEC with 2Vrms Stereo Selector
AK4682EQ Multi-channel CODEC with 2Vrms Stereo Selector
AK4683_07 Asynchronous Multi-Channel Audio CODEC with DIR/T
AK4683EQ Asynchronous Multi-Channel Audio CODEC with DIR/T
AK4683 Asynchronous Multi-Channel Audio CODEC with DIR/T
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
AK4675 制造商:AKM 制造商全稱:AKM 功能描述:Stereo CODEC with MIC/RCV/HP/SPK-AMP
AK4675EG 制造商:AKM 制造商全稱:AKM 功能描述:Stereo CODEC with MIC/RCV/HP/SPK-AMP
AK4682 制造商:AKM 制造商全稱:AKM 功能描述:Multi-channel CODEC with 2Vrms Stereo Selector
AK4682AEQ 功能描述:IC CODEC MULTI-CHANNEL 48LQFP 制造商:akm semiconductor inc. 系列:* 零件狀態(tài):上次購買時間 標(biāo)準(zhǔn)包裝:1,000
AK4682EQ 制造商:AKM 制造商全稱:AKM 功能描述:Multi-channel CODEC with 2Vrms Stereo Selector