APR9301 datasheet(3/10 Pages) APLUS

3 / 10 page

INTEGRATED CIRCUITS INC.

APR9301

http://www.aplusinc.com.tw

Page

VER2.3

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.

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