ak4183 AKM Semiconductor, Inc., ak4183 Datasheet - Page 11

• Manufacturer Part Number: ak4183
• Description: I 2 C Touch Screen Controller
• Manufacturer: AKM Semiconductor, Inc.

ASAHI KASEI
[Continuous Read mode]
This continuous read operation enables the higher sampling rate and lower processor load than a single read operation. Because
once control command is sent, it does not need to update control command on each read operation until another control command
would like to be rewritten.
It is recommended that the control command must be sent to fix the internal register when power up. This initiates all registers such
as A2-0 bit, PD0 bit, and MODE bit. Once sending command to fix the internal register after first power up, the state of AK4183 is
held on the known-condition of state to ensure that AK4183 is going into desire mode to realize lowest mode. A command with
PD0= “0” should be sent so that AK4183 will be set in the lowest power down 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.
The timing of going into the sleep mode is the rising edge of the 16
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 16
The initial state after power up is in normal mode.
MS0500-E-00
Power on Sequence
Sleep mode
SDA
S
Address
th
SCL. When the sleep command is sent again under the sleep mode the mode continues the same as before.
0111XX1X
0111XX0X
Command
A/D data
N
Figure 12 Continuous A/D data Read Sequence
A/D data
N
MODE bit
Table 2 Sleep Command Setting
1
0
Sr
11
Address
th
“H” output
PENIRQN
SCL of the write operation. A/D conversion does not execute
Hi-z
A/D data
Repeat
N+X
Touch panel
Open
Open
A/D data
N+X
P
2006/04
[AK4183]