AK4186 Datasheet, PDF (1/33 Pages) Asahi Kasei Microsystems – Low Power Touch Screen Controller with I2C Interface

[AK4186]
AK4186
Low Power Touch Screen Controller with I²C Interface
GENERAL DESCRIPTION
The AK4186 is a 4-wire/ 5-wire resistive touch screen controller that incorporates 12bit SAR A/D
converter. The AK4186 can detect the pressed screen location with two A/D conversions and it can also
measure touch pressure. The AK4186 has both an automatic continuous measurement and a
measurement data calculation function. The functions that normally require external processing, such
as calculating the average screen input value, are processed by the AK4186. In addition, a new
sequential mode achieves short coordinate measurement time while greatly reducing the
microprocessor overhead. The AK4186 operates off of supply voltage down to 1.6V in order to connect
a low voltage microprocessor. The AK4186 is the best fit for cellular phone, DSC, DVC, smart phone
and other portable devices.
FEATURES
! 4-wire or 5-wire Touch Screen Interface
! I²C Serial Interface
! 12bit SAR A/D Converter with S/H circuit
! Sampling Rate: 22.2kHz
! Pen Pressure Measurement (4-wire)
! Continuous Read Function
! Integrated Internal Osc (Sequence Mode)
! Integrated Median Averaging Filter
! Low Voltage Operation: VDD = 1.6V ~ 3.6V
! PENIRQN Buffer Output
! Low Power Consumption: 60µA at 1.8V
! Auto Power Down
! Package: 12pin CSP (1.7mm x 1.3mm, pitch 0.4mm)
16pin QFN (3mm x 3mm, pitch 0.5mm)
VDD
XP/BR
YP/TR
XN/TL
YN/BL
IN/
WIPER
MS1068-E-04
4/5wire
Touch
Screen
Drivers
Interface
MUX
VREF+
AIN+ _SAR
ADC
AI N-
VREF-
VSS
Figure 1. Block Diagram
-1-
I²C
Serial I/F
&
Co ntro l
Lo gic
Internal
Osc
TEST
CAD0
SCL
SDA
PENIRQN
I²C-bus is a trademark of NXP B.V.
2011/03