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PDF AK4181A Data sheet ( Hoja de datos )
| Número de pieza | AK4181A | |
| Descripción | TOUCH SCREEN CONTROLLER | |
| Fabricantes | Asahi Kasei Microsystems | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de AK4181A (archivo pdf) en la parte inferior de esta página. Total 17 Páginas | ||
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ASAHI KASEI
[AK4181A]
AK4181A
Features:
Sampling Frequency: 125kHz(max)
Pen Pressure Measurement
On-Chip Thermo Sensor
Two Auxiliary Analog Inputs
Direct Battery Measurement
4-wire I/F
On-Chip Voltage Reference (2.5V)
12 bit SAR type A/D Converter with S/H circuit
Low Power Consumption (250µA)
Low Voltage Operation (2.7V - 3.6V)
Package
16pin TSSOP
Touch Screen Controller
General Description:
The AK4181A is a 4-wire touch screen controller that
incorporates a 12-bit 125kHz sampling SAR A/D converter.
The AK4181A can detect the pressed screen location by
performing two A/D conversions. In addition to location, the
AK4181A also measures touch screen pressure.
On-chip VREF can be utilized for two analog auxiliary
inputs and battery monitoring, with the ability to measure
voltages from 0V to 5V.
The AK4181A also has an on-chip temperature sensor.
XP
YP
XN
YN
IN1
IN2
VBAT
R1
R2
PENIRQN
PEN
INTERRUPT
Internal VREF(2.5V)
VREF+
VREF-
AIN+
12bit
AIN- ADC
(SAR type)
Temp.
Sensor
VCC
Block Diagram
Control
Logic
GND
DCLK
CSN
DIN
DOUT
BUSY
VREF
MS0313-E-00
DataSheet4 U .com
1
2004/06
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ASAHI KASEI
[AK4181A]
Analog Characteristics
Ta=-20°C to 70°C, VCC=2.7V, External Vref =2.5V, fs=125kHz, fDCLK=16*fs, 12bit mode
Parameter
min typ
ADC for Touch Screen
Resolution
12
No Missing Codes
11 12
Integral Linearity Error
DNL
Analog Input Voltage Range
±1
0
Offset Error
Gain Error
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
2.45 2.50
Drift 30
Load Capacitance
0.1
Reference Input
Input Voltage Range
Battery Monitor
Input Voltage Range
Input Impedance (Battery Measure Mode)
5 10
Accuracy (Note 2) External VREF = 2.5V is used
Accuracy (Note 2) Internal Reference is used.
Temperature Measurement
Temperature Range
-20
Resolution (Note 3)
1.6
Accuracy (Note 4)
±3
Power Supply Current
Normal Mode (Internal Reference OFF)
250
Normal Mode (Internal Reference ON)
520
Full Power Down(when writing control command with PD1=PD0= “0”)
0
max
±2
Vref
±6
±4
2.55
VCC
5.0
±2
±3
70
500
800
3
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.
MS0313-E-00
DataSheet4 U .com
5
2004/06
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ASAHI KASEI
[AK4181A]
Control Command
The control command, 8 bits, provided to the AK4181A via DIN is shown in the following table. This command includes start bit,
channel selection, resolution, measurement configuration, and power-down mode. The AK4181A latches the serial command at
the rising edge of DCLK. Table 2 gives detailed information regarding the bit order, function, the status of driver switch, ADC
input, reference voltage.
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 AK4181A 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
OFF OFF OFF OFF IN2
GND
GND
GND
GND
GND
GND
GND
GND
YN
XN
XN
XN
GND
Reference Voltage
(∆VREF)
VREF+ VREF-
Note
VREF
VREF
VREF
VREF
VREF
VREF
VREF
VREF
YP
YP
YP
XP
VREF
GND
GND
GND
GND
GND
GND
GND
GND
YN
XN
XN
XN
GND
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
IN2 (Note 6)
NA
Note 6. Note that IN2 auxiliary input is measured by single-ended mode although SER/ DFR bit is “0”.
Table 2 Control Command List
MS0313-E-00
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2004/06
11 Page | ||
| Páginas | Total 17 Páginas | |
| PDF Descargar | [ Datasheet AK4181A.PDF ] | |
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