ASAHI KASEI
[AK4182A]
AK4182A
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 (260µA)
Package
16pin QFN
Touch Screen Controller
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
XP
DCLK
YP
Level
Shifter
Control
Logic
CSN
XN
DOUT
YN
DIN
IN
VBAT
R1
R2
VREF+
AIN+
AIN-
VREF-
BUSY
Internal VREF(2.5V)
IOVDD
PENIRQN
12bit
ADC
(SAR type)
PEN
INTERRUPT
Temp.
Sensor
VCC
VREF
GND
Block Diagram
MS0482-E-00
1
2006/03
AKM [ ASAHI KASEI MICROSYSTEMS ]
