Rainbow Electronics APR9301 - Manual (Page 3)

INTEGRATED CIRCUITS INC.
- APR9301
http://www.aplusinc.com.tw Page / 10 VER2.1 3
Sample Application
Figure 3 shows the diagram for a single,
20-second message recording and
playback application using the APR9301
device. When pins are connected as shown
in this example,the operating modes are as
follows:
Record Mode (Level-Activated)
A single voice message of up to 20 seconds
can be recorded.The /LED pin will go low
during the actual recording process to
provide a visual indication if an LED light is
connected to this pin. The chip is in record
mode as long as the /RecL pin stays low
level-activated). If the message lasts longer
than 20 seconds, recording will terminate
automatically after the last available
memory cell is written. If the message is
shorter
than 20 seconds, the recording operation
will stop when the /RecL pin goes high.
The speaker driver is automatically
tristated during the recording operation.
Messages of up to 30 seconds can be
recorded by using
different OscR resistor values
(see Table 1).
Playback Mode (Edge-Activated)
Playback always starts from the beginning
of the message.The chip is in playback
mode after the /PlayE pin pulses low
(edge-activated). Playback will stop
immediately when the /PlayE pin pulses low
a second time.
If the newly recorded message is shorter
than the previously recorded message,
the remaining portion of the previous
message will not be played after the new
message is played back.
The input preamplifier, AGC, and main
amplifier circuits are disabled during
playback.
Standby Mode (/CE = "0)
The chip will automatically return to the
standby state after recording or playback
operation is completed.
Power Down Mode (/CE = "1 `)
The chip is always in standby state.
No recording or playback is allowed.
Current consumption is typically less than
1uA.