Copyright  ANPEC Electronics Corp.
Rev. A.8 - Apr., 2002
APT7843
www.anpec.com.tw1
ANPEC reserves the right to make changes to improve reliability or manufacturability without notice, and advise
customers to obtain the latest version of relevant information to verify before placing orders.
Touch Screen Controller
Description
The APT7843 Touch Screen Controller IC provides all
the screen drive , A/D converter and control circuits
to easily interface to 4 wire resistive touch screen.
The IC continually monitors the screen waiting for a
touch. When the screen touched , the IC performs
A/D converter to determine the location of touch.
Also , this device has 2 auxiliary input to A/D con-
verter , allowing for the measurement of other inputs
such as battery voltage.
Applications
• PDAs
• Handheld computer
• Touch-screen kiosks
Features
• 16 pin SSOP or TSSOP
• Operates with four wire touch screen
• 8-bit or 12 bit A/D converter
• Ratiometric Conversion eliminates screen
calibration
• 2 auxiliary analog inputs
• 4 wire serial interface
• Full power down control
+Vcc 1
14
15
16
8
7
6
5
4
3
2
11
12
13
9
10IN3
GND
Y-
X-
Y+
X+
DOUT
BUSY
DIN
DCLK
IN4 VREF
+Vcc
CS
PENIRQ
Pin Assignment
Order Information
APT7843
Temp. Range
Package Code
Package Code
N : SSOP O : TSSOP
Temp. Range
I : - 40 to 85 C°