ASAHI KASEI
[AK4183]
AK4183
Features:
12-bit SAR type A/D Converter with S/H circuit
Low Voltage Operation (2.5V
∼
3.6V)
I
2
C bus I/F Supports
(Standard mode 100 KHz, Fast mode 400 KHz)
4-wire resistive touch screen Interface
Pen Pressure Measurement
Auto Power Down
Continuous Read Operation
Low Power Consumption (91µA @Fast mode)
Package
10pin TMSOP
I
2
C Touch Screen Controller
General Description:
The AK4183 is a 4-wire resistive touch screen controller
that incorporates SAR type A/D converter.
The AK4183 operates down to 2.5V supply voltage in
order to connect a low voltage drive processor.
The AK4183 can detect the pressed screen location by
performing two A/D conversions. In addition to location,
the AK4183 also measures touch pressure.
As the package size of 10 pin TMSOP is 4.0mm x 2.9mm
this is much smaller than QFN and BGA package.
AK4183 is the best fit for cellular phone, PDA, or other
portable devices.
XP
SDA
YP
SCL
Control
Logic
CAD0
XN
YN
PENIRQN
VREF+
AIN+
AIN-
VREF-
12bit
ADC
(SAR type)
PEN
INTERRUPT
VCC
GND
Block Diagram
MS0500-E-00
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2006/04
ASAHI KASEI
[AK4183]
Ordering Guide
AK4183VT
-40°C
∼
+85°C
10pin TMSOP (0.5mm pitch)
Pin Layout
VCC
XP
YP
XN
YN
1
2
3
4
5
10
9
8
7
6
SCL
SDA
CAD0
PENIRQN
GND
Top View
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 of the touch panel.
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.
Pen Waiting State: Pulled up by an internal resistor (typ.10K ohm).
Touch Screen Y+ plate Voltage supply
X axis Measurement: This pin is used as the input for the A/D converter
Y axis Measurement: Supplies the voltage to Y+ position input of the touch panel
Pen Pressure Measurement: Supplies the voltage to Y+ position input of the touch panel.
Pen Waiting State: OPEN state
Touch Screen X- plate Voltage supply
X axis Measurement: Supplies the voltage to X- position input of the touch panel
Y axis Measurement: OPEN state
Pen Pressure Measurement: Supplies the voltage to X- position input of the touch panel
Pen Waiting State: OPEN state
Touch Screen Y- plate Voltage supply
X axis Measurement: OPEN state
Y axis Measurement: Supplies the voltage to Y- position input of the touch panel
Pen Pressure Measurement: This pin is the input for the A/D converter at Z2 measurement.
Pen Waiting State: connected to GND.
Ground
Pen Interrupt Output
This pin is “L” during the pen down on pen interrupt enabled state otherwise this pin is “H”.
This pin is “L” during pen interrupt disabled state regardless pen touch.
I
2
C bus Slave Address bit 0
I
2
C serial data
I
2
C serial clock
3
YP
I/O
4
XN
I/O
5
YN
I/O
6
7
GND
PENIRQN
-
O
8
9
10
CAD0
SDA
SCL
I
I/O
I
MS0500-E-00
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2006/04
ASAHI KASEI
[AK4183]
Absolute Maximum Ratings
GND = 0V (Note 1)
Parameter
Power Supplies
Input Current (any pins except for supplies)
Input Voltage
Touch Panel Drive Current
Ambient Temperature (power supplied)
Storage Temperature
Note 1.All voltages with respect to ground.
Symbol
VCC
IIN
VIN
IOUTDRV
Ta
Tstg
Min
-0.3
-
-0.3
-40
-65
max
6.0
±10
6.0(VCC+0.3)
50
85
150
Units
V
mA
V
mA
°C
°C
WARNING: Operation at or beyond these limits may result in permanent damage to the device.
Normal operation is not guaranteed at these extremes.
Recommended Operating Conditions
GND = 0V (Note 1)
Parameter
Power Supplies
Note 1. All voltages with respect to ground.
Symbol
VCC
Min
2.5
typ
2.7
max
3.6
Units
V
WARNING: AKM assumes no responsibility for the usage beyond the conditions in this datasheet.
MS0500-E-00
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2006/04
ASAHI KASEI
[AK4183]
Analog Characteristics
Ta = -40°C to 85°C, VCC = 2.7V, I C bus SCL=400 KHz, 12 bit mode
Parameter
ADC for Touch Screen
Resolution
No Missing Codes
Integral Nonlinearity (INL) Error
Differential Nonlinearity (DNL) Error
Offset Error
Gain Error
Throughput Rate
Touch Panel Driver On-Resistance
XP, YP
XN, YN
XP Pull Up Register (when pen interrupt enable)
Power Supply Current
Normal Mode PD0=”0“
Fast Mode:
SCL=400KHz
Addressed
Standard Mode: SCL=100KHz
Power Down PD0=”0“
Fast Mode:
SCL=400KHz
Not Addressed
Standard Mode: SCL=100KHz
Full Power Down (Control command PD0= ”0“ SDA=SCL= VCC)
2
min.
typ.
12
12
max.
Units
Bits
Bits
LSB
LSB
LSB
LSB
ksps
Ω
Ω
kΩ
11
±2
±1
±6
±4
8.2
5
5
10
91
68
23
6
0
200
150
3
µA
µA
µA
µA
µA
MS0500-E-00
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2006/04
ASAHI KASEI
[AK4183]
DC Characteristics (Logic I/O)
Ta = -40 to 85°C, VCC = 2.5V to 3.6V
Parameter
“H” level input voltage
“L” level input voltage
Input Leakage Current
“H” level output voltage (PENIRQN pin@ Iout = -250µA)
“L” level output voltage (PENIRQN pin @ Iout = 250µA)
(SDA pin @ Iout = 3mA)
Tri-state Leakage Current
All pins except for XP, YP, XN, YN pins
XP, YP, XN, YN pins
Symbol
VIH
VIL
IILK
VOH
VOL
IOLK
-10
-50
min.
0.7xVCC
-10
VCC-0.4
typ.
-
-
max.
0.3xVCC
10
0.4
10
50
Units
V
V
µA
V
V
µA
µA
Switching Characteristics
Ta = -40 to 85°C, VCC = 2.5V to 3.6V
Parameter (I
2
C Timing)
SCL clock frequency
Bus Free Time Between Transmissions
Start Condition Hold Time (prior to first Clock pulse)
Clock Low Time
Clock High Time
Setup Time for Repeated Start Condition
SDA Hold Time from SCL Falling
(Note 2)
SDA Setup Time from SCL Rising
Rise Time of Both SDA and SCL Lines
Fall Time of Both SDA and SCL Lines
Setup Time for Stop Condition
Pulse Width of Spike Noise Suppressed
By Input Filter
Capacitive load on bus
Symbol
fSCL
tBUF
tHD:STA
tLOW
tHIGH
tSU:STA
tHD:DAT
tSU:DAT
tR
tF
tSU:STO
tSP
Cb
min
30
1.3
0.6
1.3
0.6
1.3
0
0.1
typ
max
400
Units
kHz
µs
µs
µs
µs
µs
µs
µs
µs
µs
µs
ns
pF
0.3
0.3
0.6
0
50
400
Note 2: Data must be held for sufficient time to bridge the 300 ns transition time of SCL.
SDA
tBUF
tLOW
tR
tHIGH
tF
tSP
VIH
VIL
SCL
tHD:STA
Stop
Start
tHD:DAT
tSU:DAT
tSU:STA
Start
tSU:STO
Stop
VIH
VIL
Figure 1 AK4183 Timing Diagram
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2006/04
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