ASAHI KASEI
[AK4181A]
Pin/Function
No.
1
2
Signal Name
VCC
XP
I/O
-
I/O
Description
Power Supply
Touch Screen X+ plate Voltage supply
X axis Measurement: Supplies the voltage to X+ position input
Y axis Measurement: This pin is used as the input for the A/D converter
Pen Pressure Measurement: This pin is the input for the A/D converter at Z1 measurement.
Temperature/VBAT/IN1/IN2 Measurement: OPEN state
Pen Waiting State: Pulled up by an internal resistor (typ.50k ohm).
Touch Screen Y+ plate Voltage supply
Y axis Measurement: Supplies the voltage to Y+ position input
X axis Measurement: This pin is used as the input for the A/D converter
Pen Pressure Measurement: Supplies the voltage.
Temperature/VBAT/IN1/IN2 Measurement: OPEN state
Touch Screen X- plate Voltage supply
X axis Measurement: Supplies the voltage to X- position input
Y axis Measurement: OPEN state
Pen Pressure Measurement: Supplies the voltage.
Temperature/VBAT/IN1/IN2 Measurement: OPEN state
Touch Screen Y- plate Voltage supply
Y axis Measurement: Supplies the voltage to Y- position input
X axis Measurement: OPEN state
Pen Pressure Measurement: This pin is the input for the A/D converter at Z2 measurement.
Temperature/VBAT/IN1/IN2 Measurement: OPEN state
Pen Waiting State: connected to GND.
Ground
Analog Input for Battery Monitor
Auxiliary 1 Analog Input
Voltage Reference Input/Output
Outputs 2.5V
Auxiliary 2 Analog Input
Pen Interrupt Output
This pin should be pulled up via a 100k-ohm resistor. This pin is “L” during the pen down on
pen interrupt enable state with CSN =“H” otherwise this pin is “H”. This pin is “H” during pen
interrupt disable state with the CSN = “H” regardless pen touch. See Power-down Control and
Pen Interrupt for the reference.
Serial A/D Data Output
Output A/D data serially at the falling edge of DCLK. MSB is output at the falling edge of
BUSY signal.
Output “L” at CSN= “L” during A/D data does not output.
This pin is Hi-Z state at CSN=”H”
BUSY Output
This pin goes to low at CSN = “L”. BUSY signal is “H” only for the period between the falling
edge of 8
th
DCLK and the falling edge of 9
th
DCLK.
This pin is Hi-Z state at CSN= “H”
Serial Data Input
Inputs 8-bit control command data serially when CSN= “L”
AK4181A latches at the rising edge of DCLK. Must keep “L” while not issuing commands.
Chip Select Input
Enables writing data to the registers when CSN= “L”.
External Clock Input
3
YP
I/O
4
XN
I/O
5
YN
I/O
6
7
8
9
10
11
GND
VBAT
IN1
VREF
IN2
PENIRQN
-
I
I
I/O
I
O
12
DOUT
O
13
BUSY
O
14
DIN
I
15
16
CSN
DCLK
I
I
MS0313-E-00
3
2004/06
AKM [ ASAHI KASEI MICROSYSTEMS ]
