APT7843
Block Diagram
PENIRQ
X+
X-
Y+
Y-
IN3
IN4
VREF
Screen Driver
MUX
12 Bit or 8 Bit
A/D Converter
Serial
Interface
DCLK
CS
DIN
DOUT
BUSY
Pin Descriptions
PIN NAME DESCRIPTION
1
+Vcc Power Supply,2.2V to 5V.
2
X+ Connect to X+ on touch screen.
3
Y+ Connect to Y+ on touch screen.
4
X- Connect to X- on touch screen.
5
Y- Connect to Y- on touch screen.
6
GND Ground
7
IN3 Auxiliary Input of A/D converter.
8
IN4 Auxiliary input of A/D converter.
9
VREF Voltage Reference Input.
10 +Vcc Power Supply,2.2V to 5V.
11 PENIRQ Pen interrupt. Open anode output (requires
10kΩ to 100kΩ pull-up resistor externally)
12 DOUT Serial Data Output. This output is high
impedance when CS is HIGH.
13 BUSY Busy Output. This output is high impedance
when CS is HIGH.
14
DIN Serial Data input.
15
CS Chip Select. (Active Low)
16 DCLK Serial Clock.
Copyright ANPEC Electronics Corp.
2
Rev. A.8 - Apr., 2002
www.anpec.com.tw