ASAHI KASEI
[AK4182A]
Digital I/F
The digital I/O of AK4182A 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
IOVDD
AK4182A
Micro-
DCLK
SDIN
Processor
SDOUT
BUSY
Figure6 Digital I/F
Control Command
The control command, 8 bits, provided to the AK4182A via DIN is shown in the following table. This command includes start bit,
channel selection, resolution, measurement configuration, and power-down mode. The AK4182A 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
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 AK4182A 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
OFF
ON
ON
ON
ON
ON
ON
OFF OFF
OFF XP(Z1)
OFF YN(Z2)
YP
OFF OFF OFF OFF
IN1
OFF OFF OFF OFF TEMP1
OFF OFF
ON
ON
XP
YN
YP
YN
NA
OFF
OFF
ON
ON
ON
ON
ON
ON
OFF OFF
OFF XP(Z1)
OFF YN(Z2)
XN
XN
XN
YP
YP
XP
XN
XN
XN
Z1 (Pen Pressure)
Z2 (Pen Pressure)
X-axis
Sleep mode
NA
YP
Table 2 Control Command List
MS0482-E-00
11
2006/03
AKM [ ASAHI KASEI MICROSYSTEMS ]
