AK4180 Datasheet, PDF (1/17 Pages) Asahi Kasei Microsystems – Touch Screen Controller

[ASAHI KASEI]
AK4180
Features:
„ Sampling Frequency: 125kHz(max)
„ Pen Pressure Measurement
„ On-Chip Thermo Sensor
„ Two Auxiliary Analog Inputs
„ Direct Battery Measurement
„ 4-wire I/F
„ On-Chip Voltage Reference(2.5V)
„ 12 bit SAR type A/D Converter
„ Low Power Consumption (250µA)
„ Low Voltage Operation (2.7V - 3.6V)
„ Package
16pin TSSOP
[AK4180]
Touch Screen Controller
General Description:
The AK4180 is a 4-wire touch screen controller that incorporates
a 12-bit 125kHz sampling SAR A/D converter. The AK4180 can
detect the pressed screen location by performing two A/D
conversions. In addition to location, the AK4180 also measures
touchscreen pressure.
On-chip VREF can be utilized for two analog auxiliary inputs
and battery monitoring, with the ability to measure voltages from
0V to 5V.
The AK4180 also has an on-chip temperature sensor.
XP
YP
XN
YN
IN1
IN2
VBAT
R1
R2
PENIRQN
PEN
INTERRUPT
<MS0195-E-01>
Control
Logic
Internal
VREF(2.5V)
VREF+ VREF-
AIN+
12bit
AIN-
ADC
(SAR type)
DCLK
CSN
DIN
DOUT
BUSY
VREF
Temp.
Sensor
VCC
GND
Block Diagram
1
2003/02