Datasheet

Record Playback Essentials
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Using the Interface Connector
The interface connector allows some of the more advanced options of the IC to be accessed. It can be used to
connect off board switches for Record & Playback and gives access to the pins to play part of a message or use the
looped play option. The status LED is output to the connector, as is the audio output signal, which can be used with a
more powerful amplifier if required. The following table explains what the seven pins on the interface connector do,
along with example connections at the bottom of the page.
Name
Description
Rec
Record
:
connect a push button switch between this pin and the 3V pin to re
-
record a message when the
button is pressed. The pin can be connected to a micro controller, when it should normally be in a low
state and taken high to record.
3V
The 3V:
positive connection from the batteries.
Play
Play:
connect a push button switch between this pin and the 3V pin to playback the full message when
the button is pressed. The pin can be connected to a micro controller, when it should normally be in a
low state and briefly taken high to initiate the playback.
LED
LED out can be used to connect an external LED. The LED should be connected between 3V and the LED
pin (a current limit resistor may be required). The pin can also be used as an input to a micro controller
to determine when the device is full during record or to know when playback has finished. The pin is
normally high, going low during record and briefly upon completion of playback.
PtPly
The part play pin can be used to play the message from the beginning until the button is released. To do
this a switch should be connected between the part play pin and the 3V connection. If being driven from
a micro-controller, the signal should be normally low going high when playback is required.
SpOut
Speaker out can be used to connect the audio out to a more powerful amplifier, when the speaker out
pin connects to the amplifier boards audio in. The Record Playback board and the amplifier board must
have a common 0V connection.
0V
0V is the negative connection from the batteries.
A
dding an additional off board switch to record &
playback a message.
Adding an off board switch to part playback the
message.
Adding an off board switch to continuously loop the
message.
Connecting the board to a higher power amplifier.
Interface
Record playback
module
SpOut
0V
Audio
in
Amp
Interface
Record playback
module
Play
LED
Interface
Record playback
module
Rec
3V
Record
Playback
Play
Interface
Record playback
module
3V
PtPly