[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
S
D6
A2
D5
A1
D4
A0
D3
D2
D1
D0
MODE
PD1
PD0
SER/ DFR
BIT
7
Name
S
Function
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
2
MODE
Resolution of A/D converter. ”L”: 12 bit output “H”: 8 bit output
Measurement Mode (Single-Ended/Differential)
SER/ DFR
PD1-PD0
3
Power-down Mode (reference to “ Power-down Control”)
Control Command
Status of Driver Switch
XP XN YP YN
Reference Voltage
ADC input (∆AIN)
(∆VREF)
A2
A1
A0
SER/
DFR
AIN+
AIN-
VREF+
VREF- Note
0
0
0
0
1
1
1
1
0
0
0
0
1
1
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
1
1
1
1
1
1
1
1
0
0
0
0
0
0
0
0
OFF OFF OFF OFF TEMP0
GND
GND
GND
GND
GND
GND
GND
GND
VREF
VREF
VREF
VREF
VREF
VREF
VREF
VREF
GND
GND
GND
GND
GND
GND
GND
GND
TEMP0
Y-axis
Battery Monitor
Z1 (Pen Pressure)
Z2 (Pen Pressure)
X-axis
IN1
TEMP1
NA
Y-axis
OFF OFF
ON
ON
XP
OFF OFF OFF OFF
VBAT
OFF ON
OFF ON
ON OFF XP(Z1)
ON OFF YN(Z2)
ON
ON
OFF OFF
YP
OFF OFF OFF OFF
IN1
OFF OFF OFF OFF TEMP1
OFF OFF
ON
ON
XP
YN
YP
YN
NA
OFF ON
OFF ON
ON OFF XP(Z1)
ON OFF YN(Z2)
XN
XN
XN
YP
YP
XP
XN
XN
XN
Z1 (Pen Pressure)
Z2 (Pen Pressure)
IN1
TEMP1
NA
ON
ON
OFF OFF
YP
OFF OFF OFF OFF
IN2
GND
VREF
GND
*) Note that IN2 auxiliary input is measured by single-ended mode although SER/ DFR bit is ”0”.
Table 2 Control Command List
<MS0195-E-01>
11
2003/02
AKM [ ASAHI KASEI MICROSYSTEMS ]
