[AK4183]
■ Sleep Mode
AK4183 supports the sleep mode that enables touch panel interface to put open state and disables pen interrupt function.
AK4183 goes into the sleep mode when control command is sent to AK4183 as shown Table 2. The selection of the
sleep mode is set by “MODE” bit of the control command. The state of both the output of PENIRQN pin and the
connection with touch panel interface (XP, YP, XN, and YN) are the following Table 2. AK4183 keeps the sleep mode
until next control command is sent.
Command
0111XX1X
0111XX0X
MODE bit
PENIRQN
Hi-z
“H” output
Touch panel
Open
1
0
Open
Table 2 Sleep Command Setting
The timing of going into the sleep mode is the rising edge of the 16th SCL of the write operation. A/D conversion does
not execute when the sleep command is sent. SDA pin is “H” since SDA is pull up.
In order for going to normal mode from sleep mode the command (S= “1”) is sent. The timing of going back to normal
mode is the rising edge of the 16thSCL. When the sleep command is sent again under the sleep mode the mode
continues the same as before. The initial state after power up is in normal mode.
■ Control Command
The control command, 8 bits, provided to the AK4183 via SDA, is shown in the following table. This command
includes start bit, channel selection bit, power-down bit and resolution bit. The AK4183 latches the serial command at
the rising edge of SCL. Refer to the detailed information regarding the bit order, function, the status of driver switch,
ADC input as shown in Table 3.
BIT
7
6-4
Name
S
A2-A0
Function
Start Bit. “1” Accelerate and Axis Command, “0”: Sleep mode Command
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.
Don’t care
Power down bit (refer to power-down control)
Resolution of A/D converter. “0”: 12 bit output “1”: 8 bit output
Don’t care
3
2
1
0
X1
PD0
MODE
X2
Input
Status of Driver Switch
Reference Voltage
(ΔVREF)
ADC input (ΔAIN)
S
0
1
1
1
1
1
1
1
1
A2
1
0
0
0
0
1
1
1
A1
1
0
0
1
1
0
0
1
A0
1
0
1
0
1
0
1
0
XP
XN
YP
YN
AIN+
AIN-
VREF+ VREF- Note
Sleep
ON
OFF OFF
OFF
OFF
ON
OFF OFF
OFF
OFF
ON
OFF OFF
YP
XP
XP
YN
YP
XN
YN
XN
XN
XN
YN
XN
XN
XP
YP
YP
YP
XP
YP
YP
YP
XN
YN
XN
XN
XN
YN
XN
XN
Accelerate X-Driver
Accelerate Y-Driver
Accelerate Y+,X-
Driver
ON
ON
ON
ON
OFF
OFF
ON
ON
ON
OFF OFF
X-axis
Y-axis
Z1 (Pen Pressure)
Z2 (Pen Pressure)
ON
ON
ON
ON
OFF
OFF YN(Z2)
XP
XP(Z1)
ON
ON
1
1
1
Table 3 Control Command List
MS0500-E-01
12
2008/12
AKM [ ASAHI KASEI MICROSYSTEMS ]
