isd1740a Winbond Electronics Corp America, isd1740a Datasheet - Page 14

• Manufacturer Part Number: isd1740a
• Description: Multi-message Single-chip Voice Record&playback Devices
• Manufacturer: Winbond Electronics Corp America

Message record indicators:
b) When
Triggering of
ignored.
7.1.2
Two playback modes are executed by
a) Edge-trigger mode: Pulsing
b) Sequential Playback mode: If
Triggering
be ignored.
7.1.3
The
direction. When the pointer reaches the last message, it will jump back to the first message.
Hence, the movement is in a circular fashion among the messages. The
internally. The effect of a Low-going pulse on the
device:
a) If the device is in power-down state and the current location of the playback pointer is not
a) When
x If present, SE1 is played and LED flashes once.
x Then, the LED stays On to indicate that a recording is in progress.
x If present, SE2 is played and the LED flashes twice, and then remains Off to alert the
message. Playback automatically stops at the end of the message. Pulsing
will re-play the message. During playback, the LED flashes and goes Off when the
operation stops. Pulsing
these circumstances, the playback pointer remains at the start of the played message after
the operation is completed.
and looped from the current message to its previous message. This looping continues until
played, SE2 is played, and then device plays the first message again. During the entire
playback operation, the LED flashes. When playback stops, the playback pointer will be
placed at the start of the halted message.
the last message: the pointer will advance one message and, if present, SE1 is played.
The LED flashes once.
PLAY
FWD
user that the recording process has been completed.
Playback Operation
Forward Operation
REC
is released. After each message, SE1 is played. After the last message has been
PLAY
allows the user to move the playback pointer to the next message in a forward
REC
REC
goes High or when the memory is full:
during a record, erase, or forward operation is an illegal operation and will
during a play, erase or forward operation is an illegal operation and will be
goes Low:
PLAY
PLAY
to Low again during playback stops the operation. Under
PLAY
PLAY
Low once initiates a playback operation of the current
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is held Low constantly, all messages will be played
, which is internally debounced.
FWD
depends on the current state of the
ISD1700A SERIES
FWD
is debounced
PLAY
again