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PDF AK4182 Data sheet ( Hoja de datos )
| Número de pieza | AK4182 | |
| Descripción | Touch Screen Controller | |
| Fabricantes | Asahi Kasei Microsystems | |
| Logotipo |  |
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ASAHI KASEI
[AK4182]
AK4182
Features:
12 bit SAR type A/D Converter with S/H circuit
Low Voltage Operation (VCC = 2.2V ∼ 3.6V)
Low Voltage Digital I/F (1.5V ∼ VCC)
4-wire I/F
Sampling Frequency: 125 kHz (max)
On-Chip Voltage Reference (2.5V)
Pen Pressure Measurement
On-Chip Thermo Sensor
Direct Battery Measurement
Low Power Consumption (260µA)
Package
16pin QFN
Touch Screen Controller
General Description:
The AK4182 is a 4-wire resistive touch screen controller
that incorporates a 12-bit 125 kHz sampling SAR type
A/D converter.
The AK4182 operates down to 2.2V supply voltage and
supports digital I/O interface voltage from 1.5V to VCC in
order to connect low voltage uP.
The AK4182 can detect the pressed screen location by
performing two A/D conversions. In addition to location,
the AK4182 also measures touch screen pressure.
On-chip VREF can be utilized for analog auxiliary input,
temperature measurement and battery monitoring with
the ability to measure voltage from 0V to 5V.
The AK4182 also has an on-chip temperature sensor.
The AK4182 is available in 16pin QFN thin package
(0.75mm in height) and has the operating temperature
range of -40°C to +85°C
XP
YP
XN
YN
IN
VBAT
R1
R2
Internal VREF(2.5V)
VREF+
VREF-
AIN+
12bit
AIN- ADC
(SAR type)
Control
Logic
Level
Shifter
DCLK
CSN
DOUT
DIN
BUSY
IOVDD
PENIRQN
PEN
INTERRUPT
Temp.
Sensor
VCC
Block Diagram
VREF
GND
MS0411-E-00
DataSheet4 U .com
1
2005/08
1 page  
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ASAHI KASEI
[AK4182]
Analog Characteristics
Ta=-40°C to 85°C, VCC = IOVDD = 2.7V, External Vref=2.5V, fs = 125 KHz, fDCLK = 16 x fs, 12bit mode
Parameter
min typ max
ADC for Touch Screen
Resolution
12
No Missing Codes
11 12
Integral Nonlinearity (INL) Error
±2
Differential Nonlinearity (DNL) Error
Analog Input Voltage Range
±1
0 Vref
Offset Error
±6
Gain Error
±4
Touch Panel Driver
XP, YP, RL=300Ω
XN, YN, RL=300Ω
5
5
XP Pull Up Register (when pen interrupt enable)
50
PSRR (10KHz 100mVpp)
70
Reference Output
Internal Reference
2.44 2.50 2.56
Drift 30
Load Capacitance
0.1
Reference Input
Input Voltage Range
VCC
Battery Monitor
Input Voltage Range
5.0
Input Impedance (Battery Measure Mode)
5 10
Accuracy (Note 2) External VREF = 2.5V is used
±2
Accuracy (Note 2) Internal Reference is used.
±3
Temperature Measurement
Temperature Range
-40 85
Resolution (Note 3)
1.6
Accuracy (Note 4)
±3
Power Supply Current
Normal Mode (Internal Reference OFF)
260 500
Normal Mode (Internal Reference ON)
540 800
Full Power Down(when writing control command with PD1=PD0= “0”)
03
Units
Bits
Bits
LSB
LSB
V
LSB
LSB
Ω
Ω
KΩ
dB
V
ppm/°C
µF
V
V
KΩ
%
%
°C
°C
°C
µA
µA
µA
Note 2. Accuracy is the difference between the output code when 5 volts is input to the VBAT pin and the “ideal” code at 1.25
volts.
Note 3. “Ideal” value derived from theory
Note 4. Accuracy is defined as the difference between the voltage measured by two current sources, and the ideal voltage derived
from theory at specific temperatures.
MS0411-E-00
DataSheet4 U .com
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2005/08
5 Page 
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ASAHI KASEI
[AK4182]
Digital I/F
The digital I/O of AK4182 can operate from 1.5V IOVDD. This allows connecting the low –voltage microprocessor. The full
scale level of digital I/O voltage is specified IOVDD.
VCC=2.2V – 3.6V
IOVDD=1.5V – VCC
AK4182
IOVDD
DCLK
SDIN
SDOUT
BUSY
Micro-
Processor
Figure6 Digital I/F
Control Command
The control command, 8 bits, provided to the AK4182 via DIN is shown in the following table. This command includes start bit,
channel selection, resolution, measurement configuration, and power-down mode. The AK4182 latches the serial command at the
rising edge of DCLK. Refer to the detailed information regarding the bit order, function, the status of driver switch, ADC input,
reference voltage as shown in Table 2.
D7 D6 D5 D4 D3 D2 D1 D0
S
A2
A1
A0
MODE
SER/ DFR
PD1
PD0
BIT Name
Function
7 S Start Bit. This bit must be “H” because the AK4182 initiates the command recognition
6-4 A2-A0 Channel Selection Bits. Analog inputs to the A/D converter and the activated driver switches are
selected. Please see the following table for the detail.
3 MODE Resolution of A/D converter. ”L”: 12 bit output “H”: 8 bit output
2 SER/ DFR Measurement Mode (Single-Ended/Differential)
3 PD1-PD0 Power-down Mode (reference to “ Power-down Control”)
Control Command
A2 A1 A0
00
00
01
01
10
10
11
11
00
00
01
01
10
10
11
11
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
SER/
DFR
1
1
1
1
1
1
1
1
0
0
0
0
0
0
0
0
Status of Driver Switch ADC input (∆AIN)
XP XN YP YN AIN+ AIN-
OFF OFF OFF OFF TEMP0
OFF OFF ON ON
XP
OFF OFF OFF OFF VBAT
OFF ON ON OFF XP(Z1)
OFF ON ON OFF YN(Z2)
ON ON OFF OFF YP
OFF OFF OFF OFF IN1
OFF OFF OFF OFF TEMP1
OFF OFF ON ON
XP
OFF ON ON OFF XP(Z1)
OFF ON ON OFF YN(Z2)
ON ON OFF OFF YP
GND
GND
GND
GND
GND
GND
GND
GND
YN
XN
XN
XN
Reference Voltage
(∆VREF)
VREF+ VREF-
Note
VREF
VREF
VREF
VREF
VREF
VREF
VREF
VREF
YP
YP
YP
XP
GND
GND
GND
GND
GND
GND
GND
GND
YN
XN
XN
XN
TEMP0
Y-axis
Battery Monitor
Z1 (Pen Pressure)
Z2 (Pen Pressure)
X-axis
IN1
TEMP1
NA
Y-axis
NA
Z1 (Pen Pressure)
Z2 (Pen Pressure)
X-axis
Sleep mode
NA
Table 2 Control Command List
MS0411-E-00
DataSheet4 U .com
11
2005/08
11 Page | ||
| Páginas | Total 18 Páginas | |
| PDF Descargar | [ Datasheet AK4182.PDF ] | |
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