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參數(shù)資料
| 型號： | AK4183VT |
| 廠商： | Asahi Kasei Microsystems Co.,Ltd |
| 英文描述： | I2C Touch Screen Controller |
| 中文描述： | 觸摸屏控制器的I2C |
| 文件頁數(shù)： | 7/17頁 |
| 文件大小： | 173K |
| 代理商： | AK4183VT |
ASAHI KASEI
[AK4183]
The differential mode position detection is typically more accurate than the single-ended mode. As the full scale of single-ended
mode is fixed to the VCC, input voltage may exceed the full-scale reference voltage. This problem does not occur in differential
mode. In addition to this, the differential mode is less influenced by power supply voltage variation due to the ratio-metric
measurement.
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 that 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 that 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)]
VCC
MS0500-E-00
2006/04
7
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
VCC
Figure 3 Pen Pressure Measurements
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| AK4184 | 制造商:AKM 制造商全稱:AKM 功能描述:Analog I/F IC which includes 4-wire resistive Touch Screen Controller |
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| AK4184AEG | 制造商:AKM 制造商全稱:AKM 功能描述:TSC with Keypad Scanner and GPIO Expander |
| AK4184VG | 制造商:AKM 制造商全稱:AKM 功能描述:TSC with Keypad Scanner and GPIO Expander |
| AK4185 | 制造商:AKM 制造商全稱:AKM 功能描述:Low Power Touch Screen Controller with SPI? Interface |
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