
ASAHI KASEI
[AK4182A]
MS0482-E-00 
 2006/03 
1
AK4182A 
Touch Screen Controller
Level 
Shifter 
DCLK 
CSN 
DOUT 
DIN 
BUSY 
PEN 
INTERRUPT 
PENIRQN 
VREF 
GND 
Temp. 
Sensor 
12bit 
ADC 
(SAR type) 
VREF+ 
AIN+ 
Internal VREF(2.5V) 
VREF- 
Control 
Logic 
R1 
R2 
AIN- 
IOVDD 
VCC 
YN 
XN 
YP 
XP 
VBAT 
IN 
Block Diagram 
Features: 
 12 bit SAR type A/D Converter with S/H circuit 
Low Voltage Operation (VCC = 2.2V 
~
 3.6V)
 Low Voltage Digital I/F (1.5V 
~
 VCC) 
4-wire I/F 
Sampling Frequency: 125 kHz (max) 
On-Chip Voltage Reference (2.5V) 
Pen Pressure Measurement 
 On-Chip Thermo Sensor 
Direct Battery Measurement 
Low Power Consumption (260
μ
A) 
Package 
16pin QFN  
General Description:
The AK4182A is a 4-wire resistive touch screen 
controller that incorporates a 12-bit 125 kHz sampling 
SAR type A/D converter. 
The AK4182A operates down to 2.2V supply voltage and 
supports digital I/O interface voltage from 1.5V to VCC in 
order to connect low voltage uP. 
 The AK4182A can detect the pressed screen location by 
performing two A/D conversions. In addition to location, 
the AK4182A also measures touch screen pressure. 
On-chip VREF can be utilized for analog auxiliary input, 
temperature measurement and battery monitoring with 
the ability to measure voltage from 0V to 5V.   
 The AK4182A also has an on-chip temperature sensor. 
The AK4182A is available in 16pin QFN thin package 
(0.75mm in height) and has the operating temperature 
range of -40
°
C
 to +85
°
C