AK4183 Datasheet PDF - Asahi Kasei Microsystems

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AK4183
Asahi Kasei Microsystems

Part Number AK4183
Description I2C Touch Screen Controller
Page 17 Pages


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ASAHI KASEI
[AK4183]
AK4183
Features:
„ 12-bit SAR type A/D Converter with S/H circuit
„ Low Voltage Operation (2.5V 3.6V)
„ I2C 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
I2C 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
YP
XN
YN
MS0500-E-00
DataSheet4 U .com
VREF+ VREF-
AIN+
12bit
AIN- ADC
(SAR type)
VCC
Block Diagram
1
Control
Logic
SDA
SCL
CAD0
PENIRQN
PEN
INTERRUPT
GND
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ASAHI KASEI
„ Ordering Guide
AK4183VT
-40°C +85°C
10pin TMSOP (0.5mm pitch)
„ Pin Layout
VCC 1
XP 2
YP 3
XN 4
YN 5
Top View
10 SCL
9 SDA
8 CAD0
7 PENIRQN
6 GND
[AK4183]
No. Signal Name
1 VCC
2 XP
3 YP
4 XN
5 YN
6 GND
7 PENIRQN
8 CAD0
9 SDA
10 SCL
Pin/Function
I/O Description
- Power Supply
I/O 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).
I/O 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
I/O 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
I/O 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
O 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 I2C bus Slave Address bit 0
I/O I2C serial data
I I2C serial clock
MS0500-E-00
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ASAHI KASEI
[AK4183]
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.
Absolute Maximum Ratings
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
WARNING: Operation at or beyond these limits may result in permanent damage to the device.
Normal operation is not guaranteed at these extremes.
GND = 0V (Note 1)
Parameter
Power Supplies
Recommended Operating Conditions
Symbol
VCC
Min
2.5
typ
2.7
Note 1. All voltages with respect to ground.
max
3.6
WARNING: AKM assumes no responsibility for the usage beyond the conditions in this datasheet.
Units
V
mA
V
mA
°C
°C
Units
V
MS0500-E-00
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ASAHI KASEI
[AK4183]
Analog Characteristics
Ta = -40°C to 85°C, VCC = 2.7V, I2C bus SCL=400 KHz, 12 bit mode
Parameter
min.
typ.
max.
Units
ADC for Touch Screen
Resolution
12 Bits
No Missing Codes
11 12
Bits
Integral Nonlinearity (INL) Error
±2 LSB
Differential Nonlinearity (DNL) Error
±1 LSB
Offset Error
±6 LSB
Gain Error
±4 LSB
Throughput Rate
8.2 ksps
Touch Panel Driver On-Resistance
XP, YP
XN, YN
5
5
XP Pull Up Register (when pen interrupt enable)
10 k
Power Supply Current
Normal Mode PD0=”0“
Addressed
Fast Mode: SCL=400KHz
Standard Mode: SCL=100KHz
91 200 µA
68 150 µA
Power Down PD0=”0“
Not Addressed
Fast Mode: SCL=400KHz
Standard Mode: SCL=100KHz
23
6
µA
µA
Full Power Down (Control command PD0= ”0“ SDA=SCL= VCC)
0 3 µA
MS0500-E-00
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2006/04



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