AK4180 Datasheet, PDF (11/17 Pages) Asahi Kasei Microsystems – Touch Screen Controller

[ASAHI KASEI]
[AK4180]
„ Control Command
The control command, 8 bits, provided to the AK4180 via DIN is shown in the following table. This command includes start bit,
analog input, resolution, measurement configuration, and power-down mode. The AK4180 latches the serial command at the
rising edge of DCLK.
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 AK4180 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 SER/
Status of Driver Switch
XP XN YP YN
ADC input (∆AIN)
AIN+ AIN-
Reference Voltage
(∆VREF)
VREF+ VREF-
DFR
00
0
00
1
01
0
01
1
10
0
10
1
11
0
11
1
00
0
00
1
01
0
01
1
10
0
10
1
11
0
11
1
1
OFF OFF OFF OFF TEMP0 GND VREF GND
1
OFF OFF ON ON XP
GND VREF GND
1
OFF OFF OFF OFF VBAT GND VREF GND
1
OFF ON ON OFF XP(Z1) GND VREF GND
1
OFF ON ON OFF YN(Z2) GND VREF GND
1
ON ON OFF OFF YP
GND VREF GND
1
OFF OFF OFF OFF IN1
GND VREF GND
1
OFF OFF OFF OFF TEMP1 GND VREF GND
0
0
OFF OFF ON ON XP
YN
YP
YN
0
0
OFF ON ON OFF XP(Z1) XN
YP
XN
0
OFF ON ON OFF YN(Z2) XN
YP
XN
0
ON ON OFF OFF YP
XN
XP
XN
0
OFF OFF OFF OFF IN2
GND VREF GND
0
*) Note that IN2 auxiliary input is measured by single-ended mode although SER/ DFR bit is ”0”.
Note
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)
IN1
TEMP1
NA
Table 2 Control Command List
<MS0195-E-01>
11
2003/02