FEDL22620-01
ML22620
■Function description
●Mixing function
◆
Waveform clamp precautions for mixing
[ ] If the clamp is known to be generated in advance, adjust the volume of each channel by CVOL command.
◆
Different sampling frequency mixing algorithm
[ ] It is not possible to perform channel mixing by a different sampling frequency group.Note that when channel synthesis
is performed on a sampling frequency group other than the selected sampling frequency group, playback will be faster
or slower.
●Misoperation detection and failure detection functions
◆
SPP pin and SPM pin short detection
[ ] After inputting SAFE command, start the analog power-up operation by AMODE command within 10ms.
◆
Flash memory error detection
[ ] If the error bit (ROMERR) is set to "1" after the PUP command and before the PLAY command or START command
starts playback, this LSI may have error at the time of start. In such cases, initialize this LSI by moving the LSI to the
power-down mode by resetting the LSI by the RESETB pin or by using PDWN command.
◆
Detects the stop of clock input from a crystal resonator or ceramic resonator
[ ] If the RDERR command (first byte) is inputted before the crystal or ceramic resonator stops and switches to RC
oscillation (about 500us), the CBUSYB pin will remain "L". Therefore, read the command after the CBUSYB pin
becomes "H".
[ ] When the crystal resonator or the ceramic resonator stops and switches to RC oscillation, playback may become
abnormal. Therefore, after confirming that the error bit (OSCERR) is "1", enter STOP command to stop playback.
■Timing chart
●Power-on timing
[ ] Start up in the order of DV
DD
, SPV
DD
and IOV
DD
or DV
DD
, IOV
DD
and SPV
DD
.
[ ] Be sure to input "L" to the RESETB pin before inputting the first command after power-on.
[ ] Be sure to enter "L" at the RESETB pin when the DV
DD
is below the (recommended) operating voltage range.
●Power-off timing
[ ] Shut down in the order of IOV
DD
, SPV
DD
, and DV
DD
or SPV
DD
, IOV
DD
, and DV
DD
.
[ ] Shut down each power supply after changing to the power down status with PDWN commands.
●Change volume timing by AVOL command
[ ] Speaker amplifier volume setting by AVOL commands is valid only when Class AB speaker amplifier is used.
When a Class D speaker amplifier is used, the setting value is ignored and +0.0dB is selected.
●Continuous playback timing by PLAY command
[ ] When making continuous playbacks, input the PLAY command for the next phrases within the specified time period
(tcm) after the NCR of the corresponding channel changes to "H" level.
[ ] When the playback is not continuous, input the PLAY command for the next phrases after confirming the playback is
completed by RDSTAT command and etc.
●Continuous playback timing by START command
[ ] When making continuous playbacks, send the START command for the next phrases within the specified time period
(tcm) after the NCR of the corresponding channel changes to "H" level.
[ ] When the playback is not continuous, input the START command for the next phrases after confirming the playback is
completed by RDSTAT command, etc.
●Continuous playback timing by MUON command
[ ] When making continuous playbacks, input the MUON/PLAY/START command for the next phrases within 10ms
(tcm) after the NCR of the corresponding channel changes to "H" level.When the playback is not continuous, input
the MUON/PLAY/START command for the next phrases after confirming the playback is completed by RDSTAT
command and etc.
●Repeat playback setting/release timing by SLOOP/CLOOP command
[ ] The SLOOP command is valid only during playback. After the PLAY command is input, input the SLOOP command
within the specified period (tcm) after the NCR of the corresponding channel becomes "H" level.
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Summary of Contents for LAPIS Semiconductor ML22620
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