ISD2532 View Datasheet(PDF) - Information Storage Devices

Part Name

Description

Manufacturer

ISD2532

Single-Chip Voice Record/Playback Devices 32-*, 40-*, 48-*, 64-*, 60-, 75-, 90-, and 120-Second Durations

Information Storage Devices 

Product Data Sheets

ISD2500 Series

current cycle is terminated and the address pointer

is reset to address 0, the beginning of the message

space.

EOM Pin (RUN)

In Push-Button Operational Mode, EOM becomes

an active-HIGH RUN signal which can be used to

drive an LED or other external device. It is HIGH

whenever a Record or Playback operation is in

progress.

Recording in Push-Button Mode

1. The PD pin should be LOW, usually using a

pulldown resistor.

2. The P/R pin is taken LOW.

3. The CE pin is pulsed LOW. Recording

starts, EOM goes HIGH to indicate an oper-

ation in progress.

4. The CE pin is pulsed LOW. Recording

pauses, EOM goes back LOW. The internal

address pointers are not cleared, but an

EOM marker is stored in memory to point to

the message end. The P/R pin may be

taken HIGH at this time. Any subsequent

CE would start a playback at address 0.

5. The CE pin is pulsed LOW. Recording

starts at the next address after the previous

set EOM marker. EOM goes back HIGH.

NOTE

If the M1 operational mode pin is also

HIGH, the just previously written EOM bit

is erased, and recording starts at that

address.)

6. When the recording sequences are fin-

ished, the final CE pulse LOW will end the

last Record cycle, leaving a set EOM

marker at the message end. Recording may

also be terminated by a HIGH level on PD,

which will leave a set EOM marker.

Playback in Push-Button Mode

1. The PD pin should be LOW.

2. The P/R pin is taken HIGH.

3. The CE pin is pulsed LOW. Playback starts,

EOM goes HIGH to indicate an operation in

progress.

4. If the CE pin is pulsed LOW or an EOM

marker is encountered during an operation,

the part will pause. The internal address

pointers are not cleared, and EOM goes

back LOW. The P/R pin may be changed at

this time. A subsequent Record operation

would not reset the address pointers and

the recording would begin where Playback

ended.

1 5. CE is again pulsed LOW. Playback starts

where it left off, with EOM going HIGH to

indicate an operation in progress.

6. Playback continues as in steps 4 and 5 until

PD is pulsed HIGH or overflow occurs.

7. If in overflow, pulling CE LOW will reset the

address pointer and start Playback from the

beginning. After a PD pulse, the part is reset

to address 0.

NOTE

Push-button mode can be used in con-

junction with modes M0, M1, and M3.

Good Audio Design Practices

ISD products are very high-quality single-chip

voice Recording and Playback systems. To ensure

the highest quality voice reproduction, it is impor-

tant that good audio design practices on layout and

power supply decoupling be followed. See the ISD

Application Notes and Design Manual in this book

for details.

* Advance information: ISD2532/40/48/64 devices.

1–87

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