FEDL6688-6688L-04
OKI Semiconductor
MSM6688/6688L
Issue Date: January 25. 2002
ADPCM Solid-State Recorder IC
GENERAL DESCRIPTION
The MSM6688/6688L is a “solid-state recorder” IC developed using the ADPCM method. By externally
connecting a microphone, a speaker, a speaker drive amplifier, and a dedicated register to store ADPCM data, it
can record and play back voice data in a manner similar to a tape recorder.
The MSM6688 supports 5 V operation and has a stand-alone mode and a microcontroller interface mode.
The MSM6688L supports 3 V operation and controls recording/playback in microcontroller interface mode.
In the stand-alone mode, recording/playback conditions can be selected by pins and the MSM6688/6688L can be
controlled by a simple drive timing. In the microcontroller interface mode, recording/playback can be controlled
by commands from the microcontroller. In the microcontroller interface mode, the MSM6688/6688L is much
more flexible than in the stand-alone mode.
In addition, the MSM6688/6688L can form easily a recording and playback circuit with fixed messages by
connecting serial registers and serial voice ROMs as external memories.
Note: This data sheet explains a stand-alone mode and a microcontroller interface mode, separately.
Differences between MSM6688 and MSM6688L
Parameter
MSM6688
MSM6688L
3.5 to 5.5 V
2.7 to 3.6 V
Standalone mode,
Microcontroller interface mode
Microcontroller interface mode only
0 to VDD
1/4 to 3/4 VDD
Operating voltage
Control mode
Full scale of A/D and D/A
converters
Voice detection level for voice
triggered starting
External-only register
±
VDD
64
,±
VDD
32
,±
VDD
16
32M bits (max.)
4M bits (MSM6684B)
8M bits (MSM6685A)
±
VDD
128
,±
VDD
64
, ±
VDD
32
4M bits (max.)
4M bits (MSM66V84B)
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