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參數(shù)資料
| 型號： | AK4181A |
| 廠商： | Asahi Kasei Microsystems Co.,Ltd |
| 英文描述： | TOUCH SCREEN CONTROLLER |
| 中文描述： | 觸摸屏控制器 |
| 文件頁數(shù)： | 17/17頁 |
| 文件大小： | 188K |
| 代理商： | AK4181A |
ASAHI KASEI
[AK4181A]
MS0313-E-00
2004/06
9
ON
YN
VREF+
VREF-
ADC
AIN+
AIN-
XP
YP
XN
ON
a)
Z1-Position Measurement Differential Mode
touch
ON
YN
VREF+
VREF-
ADC
AIN+
AIN-
XP
YP
XN
ON
b)
Z2-Position Measurement Differential Mode
touch
Figure 3 Pen Pressure Measurements
Voltage Reference
The AK4181A has an internal 2.5V voltage reference. This reference can be turned ON when PD1 = “1”, and OFF when PD1 =
“0”. This reference is used in the single-ended mode for the battery monitoring, temperature measurement, or for auxiliary input.
A 0.1
F or larger capacitor should be connected for stable operation of the VREF circuit. Settling time depends on this external
capacitance, but 400
s or longer time is required if the external capacitance is 0.1F.
If an external voltage reference is used, PD1 bit should be set to “0”.
Battery Measurement
The AK4181A can directly measure the battery voltage up to 5V while the AK4181A operates at 2.7V to 3.3V. The input voltage
is internally divided down by 4 and applied to the input of AD converter (AIN+). Minimum 5
s is required as tracking time. If
the source impedance is larger, more tracking time is required.
PD1
Internal
VREF(2.5V)
R1=7.5K
R2=2.5K
VBAT
ADC
Enable
R0
AIN+
AIN-
VREF+
VREF-
VREF
Figure 4 Battery Monitoring
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| AK4181AVT | 制造商:AKM 制造商全稱:AKM 功能描述:TOUCH SCREEN CONTROLLER |
| AK4181AVTP-E2 | 制造商:Asahi Kasei Microsystems Co Ltd 功能描述: |
| AK4182 | 制造商:AKM 制造商全稱:AKM 功能描述:Touch Screen Controller |
| AK4182A | 制造商:AKM 制造商全稱:AKM 功能描述:touch screen controller |
| AK4182AVN | 制造商:AKM 制造商全稱:AKM 功能描述:Touch Screen Controller |
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