ISD1800 Datasheet, PDF (10/26 Pages) Winbond – SINGLE-CHIP, SINGLE-MESSAGE VOICE RECORD/PLAYBACK DEVICE 6- TO 16-SECOND DURATION

I1800 SERIES
7.2. FUNCTIONAL DESCRIPTION EXAMPLE
The following example operating sequence demonstrates the functionality of the I1800 devices.
1. Record a message filling the memory
Pulling the REC pin HIGH initiates a record cycle form the beginning of the message space. The
device will automatically power down after REC is release LOW. An EOM marker is written at the end
of message. If REC is held HIGH, the recording continues until the message space has been filled.
Once the message space is filled, recording ceases.
2. Edge-activated playback
Pulling the PLAYE pin HIGH initiates a playback cycle from the beginning of the message space.
When the device reaches the EOM marker, it automatically powers down. If a recording has filled the
message space, the entire message is played. A subsequent rising edge on PLAYE initiates a new
play cycle from the beginning of the memory.
3. Level-activated playback
Pulling the PLAYL pin HIGH initiates a playback cycle from the beginning of the message space.
When the device reaches the EOM marker, it automatically powers down. If a recording has filled the
message space, the entire message is played. A subsequent rising edge on PLAYL initiates a new
play cycle from the beginning of the memory.
4. Level-activated playback (truncated)
If PLAYL is pulled LOW any time during the playback cycle, the device stops playing and enters the
power-down mode. A subsequent rising edge on PLAYL initiates a new play cycle from the beginning
of the memory.
5. Record (interrupting playback)
The REC pin takes precedence over other operations. Any HIGH-going transition on REC initiates a
new record operation from the beginning of the memory, regardless of any current operation in
progress.
6. Record a message, partially filling the memory
A record operation need not fill the entire memory. Releasing the REC pin LOW before filling the
message space causes the recording to stop and an EOM marker to be placed. The device powers
down automatically.
7. Playback a message that partially fills the memory
Pulling the PLAYE or PLAYL pin HIGH initiates a playback cycle. The playback cycle ceases when the
EOM marker is encountered and the device then powers down.
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