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參數(shù)資料
| 型號(hào)： | APT7843OI |
| 廠商： | Anpec Electronics Corporation |
| 英文描述： | Touch Screen Controller |
| 中文描述： | 觸摸屏控制器 |
| 文件頁數(shù)： | 16/18頁 |
| 文件大?。?/td> | 622K |
| 代理商： | APT7843OI |
Copyright ANPEC Electronics Corp.
Rev. A.8 - Apr., 2002
APT7843
www.anpec.com.tw
7
Chip Overview
The analog input to the converter is provided via a
four-channel multiplexer. Figure 2 shows a simplified
diagram of the APT7843 with the difference input of
the A/D converter , and the converter’s reference.
Table I and Table II also show the relationship between
the A2 , A1 , A0 , SER/
and the configuration of
the APT7843. See the section of single-ended refer-
ence mode and differential reference mode for more
details.
Analog Input
The APT7843 is a successive approximation analog-
to-digital (A/D) converter based around a capacitive
redistribution DAC. Figure 1 show basic operation of
the APT7843.
The APT7843 communicates via a 4-wire serial
interface. The device also requires an external refer-
ence voltage Vref. The value of the reference voltage
directly sets the input range of the converter.
The APT7843 primary function is to control resistive
touchscreens. When a touch is detected , pen inter-
rupt pin will go low to wake up extenal microprocess.
The microprocessor writes register to initiate
conversion.
This A/D converter may also be used to measure
voltage presented on the IN3 , IN4 pins.
DFR
FIGURE 1. Basic Operation of the APT7843
1
14
15
16
8
7
6
5
4
3
2
11
12
13
9
10
IN 3
X-
Y+
X+
DO UT
BUSY
DIN
DCLK
IN 4
V REF
+V cc
CS
PENIR Q
+V cc
APT7843
100k ohm (optional)
A uxiliary Input
+2.2V to +5V
To
Touch
Screen
1uF
to
10uF
(O ptional)
0.1uF
C onnect to
M icroprossor
Y-
GN D
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| APT7846 | 制造商:ANPEC 制造商全稱:Anpec Electronics Coropration 功能描述:Touch Screen Controller |
| APT7846NI-TR | 制造商:ANPEC 制造商全稱:Anpec Electronics Coropration 功能描述:Touch Screen Controller |
| APT7846NI-TU | 制造商:ANPEC 制造商全稱:Anpec Electronics Coropration 功能描述:Touch Screen Controller |
| APT7846OI-TR | 制造商:ANPEC 制造商全稱:Anpec Electronics Coropration 功能描述:Touch Screen Controller |
| APT7846OI-TU | 制造商:ANPEC 制造商全稱:Anpec Electronics Coropration 功能描述:Touch Screen Controller |
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