ak4181a AKM Semiconductor, Inc., ak4181a Datasheet - Page 3

• Manufacturer Part Number: ak4181a
• Description: Touch Screen Controller
• Manufacturer: AKM Semiconductor, Inc.

ASAHI KASEI
MS0313-E-00
No.
10
11
12
13
14
15
16
1
2
3
4
5
6
7
8
9
VCC
XP
YP
XN
YN
GND
VBAT
IN1
VREF
IN2
PENIRQN
DOUT
BUSY
DIN
CSN
DCLK
Signal Name
I/O
I/O
I/O
I/O
I/O
I/O
O
O
O
-
-
I
I
I
I
I
I
Power Supply
Touch Screen X- plate Voltage supply
Ground
Analog Input for Battery Monitor
Auxiliary 1 Analog Input
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
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
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”.
Touch Screen X+ plate Voltage supply
Touch Screen Y+ plate Voltage supply
Touch Screen Y- plate Voltage supply
Voltage Reference Input/Output
Serial A/D Data Output
External Clock Input
Pen Interrupt for the reference.
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).
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
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.
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
th
DCLK and the falling edge of 9
Pin/Function
3
Description
th
DCLK.
Power-down Control and
[AK4181A]
2004/06