isd1810 Winbond Electronics Corp America, isd1810 Datasheet - Page 9

• Manufacturer Part Number: isd1810
• Description: Single-chip, Single-message Voice Record/playback Device 8- To 16-second Durations
• Manufacturer: Winbond Electronics Corp America

IS D1810 Product
FUNCTIONAL DE S C RIPTION EX A M P L E
The following example operating sequence dem-
onstrates the functionality of the I SD1810 devices.
6
1. Record a message filling the memory.
2. E dge-activated playback.
3. L evel-activated playback.
4. L evel-activated playback (truncated).
5. R ecord (interrupting playback).
Pulling the REC pin HIGH initiates a record
cycle from the beginning of the message
space. The device will automatically power
down after RE C is released LOW. An EOM
marker is written at the end of message. If
R E C is held HIGH, the recording continues
until the message space has been filled.
Once the message space is filled,
recording ceases.
Pulling the PLAY E pin HIGH initiates a
playback cycle from the beginning of the
message space. The falling edge of PL AY E
has no effect on operation. 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 PL AY E initiates a new play cycle
from the beginning of the memory.
Pulling the PLAYL pin HIGH initiates a
playback cycle from the beginning of the
message
reaches the EOM marker, it automatically
powers down. If 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.
If PL AY L 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
memory.
space. When
the
device
6. R ecord a message, partially filling the
7. P lay back a message that partially fills the
8. R E CLED operation.
9. R O S C Operation
The R E C pin takes precedence over other
operations. Any HIGH -going transition on
R E C initiates a new record operation from
the beginning of the memory, regardless of
any current operation in progress.
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.
memory.
Pulling the PLAYE or PLAY L pin HIGH initiates
a playback cycle. The playback cycle
ceases
encountered and the device then powers
down.
The RE CLE D output pin provides an active-
LOW signal which can be used to drive an
L E D as a “record-in- progress” indicator. It
returns to a HIGH state when the RE C pin is
released LOW or when the recording is
completed due to the memory being
filled. This pin also pulses LOW to indicate
the end of a message has been reached.
The duration of the device can be varied
by changing the value of R2 (R
means the ISD1810 device can actually
be between 8 to 16 seconds duration. See
the curve below which charts typical
durations when the R
80 K to 160 K .
T his feature allows frequency shifting where
a recorded voice or sound can be played
back faster or slower than normal for
special effects. For example, use a 100 K
resistor to make the recording and then
when
the
Voice Solutions in Silicon
OSC
EOM
is varied from
marker
OSC
). This
is
™