AK4673 Datasheet, PDF (75/107 Pages) Asahi Kasei Microsystems – Stereo CODEC with MIC/HP-AMP and Touch Screen Controller

[AK4673]
[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 is rewritten.
A/D data A/D data
A/D data A/D data
SDA S Address
N
N
Sr Address
N+X
N+X
P
Repeat
■ Power on Sequence
Figure 73 Continuous A/D data Read Sequence
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 the AK4673 is held on the known-condition of state to ensure that the AK4673 is going into desire mode to
realize lowest mode. A command with PD0= “0” should be sent so that the AK4673 will be set in the lowest power down
mode.
■ Sleep mode
The AK4673 supports the sleep mode that enables touch panel interface to put open state and disables pen interrupt
function. The AK4673 goes into the sleep mode when control command is sent to the AK4673 as shown Table 59. The
selection of the sleep mode is set by “MODE” bit of the control command. The state of both the output of the PENIRQN
pin and the connection with touch panel interface (XP, YP, XN, and YN) are the following Table 59. AK4673 keeps the
sleep mode until next control command is sent.
Command
0111XX1X
0111XX0X
MODE bit PENIRQN
1
Hi-z
0
“H” output
Table 59 Sleep Command Setting
Touch panel
Open
Open
The timing of going into the sleep mode is the rising edge of the 16^th SCL of the write operation. A/D conversion does not
execute when the sleep command is sent. The SDA pin is “H” since SDA is pull up.
In order to go 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^thSCL. 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.
MS0670-E-00
- 75 -
2007/09