FEDL2502-03
OKI Semiconductor
ML2502
FUNCTIONAL DESCRIPTION
The ML2502 has 2 recording/playback modes; Dual-Phrase Recording/Playback Mode where the entire memory
space is divided evenly into two areas and Single Phrase Recording/Playback Mode where the entire memory
space is used for a single phrase recording/playing.
In Dual-Phrase Recording/Playback mode, the memory area from the top address to the center address is assigned
to Phrase 1, while the memory area from the center address to the last address is assigned to Phrase 2.
You can record or play Phrase 1 using the REC1 and PLAY1 pins, and Phrase 2 using the REC2 and PLAY2 pins.
Meanwhile, you can perform recording/playback operation with the REC1 pin connected to REC2 and the PLAY1
pin connected to PLAY2 in Single Phrase Recording/Playback mode.
The ML2502 is capable of storing the Recording-Stop address for each phrase in the on-chip Flash memory. For
play operation, it automatically stops playing when the Stop address has been reached. Therefore, your application
does not need any external MCU to control addressing.
Dual-Phrase Recording/Playback Mode
Phrase 1 Recording Operation
(1) To power up the LSI and start recording Phrase 1 from the top address of the memory, keep inputting “H”
level to the REC1 pin. Recording goes on while the REC1 pin stays “H”.
(2) The LSI automatically stops recording when the center address of the memory has been reached.
(3) When recording is complete, the LSI automatically powers down, entering a low-power-consumption state.
(4) To stop recording phrase 1 half way, bring the REC1 pin to “L” level. When recording is complete, the LSI
automatically powers down, entering a low-power-consumption state.
Note: Record operation lets the LSI overwrite the existing data in memory area of each phrase, which means the
previous recording data is erased whenever new recording is made.
Start recording
REC1
MON
Power Down
Powering UP
Recording
Power Down
Shifting to Power-down
Post-Recording Process
Stop recording
Figure 1 Phrase 1 Recording Operation Timing Chart
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