Aplus APR9600 Service Manual

/M1_Message

VCCD

INTEGRATED CIRCUITS INC.

APR9600

Single-Chip Voice Recording & Playback Device

60-Second Duration

Features

• Single-chip, high-quality voice recording & playback solution

- No external ICs required

- Minimum external components

• Non-volatile Flash memory technology

- No battery backup required

• User-Selectable messaging options

- Random access of multiple fixed-duration messages

- Sequential access of multiple variable-duration

messages

• User-friendly, easy-to-use operation

- Programming & development systems not required

- Level-activated recording & edge-activated play back switches

• Low power consumption

- Operating current: 25 mA typical

- Standby current: 1 uA typical

- Automatic power-down

• Chip Enable pin for simple message expansion

General Description

The APR9600 non-volatile stora onds. The device supports both random and sequential access of multiple messa able, allowin quality and stora microphone amplifier, and AGC circuits tem desi recorders, toys, and many other consumer and industrial applications.

APLUS integrated

bility by usin nology implem memory process, where each memory cell can store 256 volta

e levels. This technology enables the APR9600 device to reproduce voice si need for encodin distortion.

Update:2002/11/05

devi

ce offers true single-chip voice recording, e, and playback capability for 40 to 60 sec-

es. Sample rates are user-select-

designers to customize their design for unique

e time needs. Integrated output amplifier,

n. the device is ideal for use in portable voice

achieves these high levels of storage capa-

its proprietary analog/multilevel storage tech-

ented in an advanced Flash non-volatile

nals in their natural form. It eliminates the

and compression, which often introduce

reatly

mplify sys-

Pinout Diagram

Figure 1 APR9600 Pinout Diagram

1

/M2_Next

/M3 /M4 /M5 /M6 OscR

/M7_END

/M8_Option

/Busy

VSSD VSSA SP+

2 3 4 5 6 7 8 9 10 11 12 13 14

28 27 26 25 24 23 22 21 20 19 18 17 16 15

/RE ExtCIK

MSEL2 MSEL1

/CE

/Strobe

Ana_Out Ana_In AGC

MicRef

Micln

VCCA SP-

Page 1

APLUS

APR9600

Functional Description

The APR9600 block diagram is included in order to give understandin left hand side of the dia ential microphone amplifier, includin included on-chip for applications re fied microphone si the Ana_Out pin to the Ana_In pin through an external DC blockin Ana_In pin throu connection between Ana_In and Ana_Out is still re pla

back. The next block encountered by the input signal is the internal anti-aliasin its response accordin Shannon’s Samplin filtering is accomplished the signal is ready to be clocked into the memor

of the APR9600 i i nternal architecture. At the

ram are the analog inputs. A differ-

integrated AGC, is

uiring its use. The ampli-

nal is fed into the device by connectin

capacitor. Recording can be fed directly into the

h a DC blocking capacitor, however, the

uired for

filter. The filter automatically adjusts

to the sampling frequency selected so

Theorem is satisfied. After anti-aliasin

array. This storage is accomplished through a

Figure 2 APR9600 Block Diagram

OscR

ExtClk

Ana_In

Ana_Out

MicIn

MicRef

AGC

Pre-

Amp

Internal

Oscillator

Automatic Gain

Control (AGC)

Mux

Anti-Aliasing

Filter

combination of the Sample and Hold circuit and the Analo Write/Read circuit. These circuits are clocked by either the Internal Oscillator or an external clock source. When pla back is desired the previousl from memor the ri b

connecting a speaker to the SP+ and SP- pins. Chip-wide mana block shown in the upper ri a

ement is controlled through the message control block represented in the lower center of the block dia on actual device application can be found in the

Applications

found in the detail on messa found in the

Sample & Hold

Circuit

Analog Write &

Read Circuits

256k Cell

Flash EPROM

Analog Storage

Array

Message Decoders

, low pass filtered, and amplified as shown on

ht hand side of the diagram. The signal can be heard

ement is accomplished through the device control

section. More detail on sampling control can be

Sample Rate and Voice Quality

e management and device control can be

Message Management

Low Pass

stored recording is retrieved

ht hand corner. Message man-

ram. More detail

section. More

section.

/CE /RE

Device Control

Filter

Amp

Sample

/Strobe /Busy BE

MSEL1 MSEL2

SP-

SP+

Power Supplies

/M2_Next

VCC VCCA VSSD VSSA /M1_Message

Page 2 Single-Chip Voice Recording & Playback Device for Multiple 40- to 60-Second Messages

Message Control

/M3 /M4 /M5

/M7_END /M8_Option

/M6

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APLUS

APR9600

Message Management

Message Management General Description

Pla

back and record operations are managed by on chip cir-

cuitr

. There are several available messaging modes dependin determine messa external parts count. Therefore, the desi appropriate operatin Operatin on factors affectin

Quality

The device supports three messa

defined by the MSEL1, MSEL2 and /M8_Option pins shown

in Fi

• Random access mode with 2, 4, or 8 fixed-duration mes-

upon desired operation. These message modes

e management style, message length, and

ner must select the

before

beginning the design.

affect voice quality; for information

Sampling Rate & Voice

e management modes

modes do

section.

ures 1 and 2):

mode

not

uality refer to the

Table 1

Mode MSEL1 MSEL2 /M8_Option

Random Access 2 fixed duration messages

Random Access 4 fixed duration messages

Random Access 8 fixed duration messages

Tape mode, Normal operation

Tape mode, Auto rewind operation

• Tape mode, with multiple variable-duration messa vides two options:

- Auto rewind

-Normal

Modes cannot be mixed. Switchin has recorded an initial messa modes are switched after an initial recordin some unpredictable messa mode ma the new mode. These fra operation in the newl decodin

An important feature of the APR9600 messa capabilities is the abilit chan superimposed on the device’s output. This feature is enabled b

asserting a logic high level on the BE pin.

remain present, and be audible on playback, in

ments will disappear after a record

selected mode. Table 1 defines the

necessary to choose the desired mode.

to audibly prompt the user to

es in the device’s status through the use of “beeps”

Pull this pin to VCC through 100K resistor

Becomes the /M8 message trigger input pin

of modes after the device

e is not recommended. If

has been made

e fragments from the previous

es, pro-

e management

Random Access Mode

Random access mode supports 2, 4, or 8 messa ments of fixed duration. As su can be made randoml len

th of each message segment is the total recording length available b

the total number of segments enabled (as decoded in Table1 messa

as defined by the selected sampling rate) divided

. Random access mode provides easy indexing to

e segments.

in any of the selected messages. The

ested recording or playback

es seg-

Functional Description of Recording in Random Access Mode

On power up, the device is ready to record or play back, in an

of the enabled message segments. To record, /CE must be set low to enable the device and /RE must be set low to enable recordin level on the messa se

ment you intend to use. The message trigger pins are labeled /M1_Messa pin 7) for message segments 1-8 respectively.

Note:

Messa /M7_END, and /M8_Option, have expanded names to represent the different functionalit

. You initiate recording by applying a low

e trigger pin that represents the message

e - /M8_Option on pins 1-9 (excludin

e trigger pins /M1_Message, /M2_Next,

that these pins

assume in the other modes. In random access mode these pins should be considered purel

er pins with the same functionality as /M3, /M4, /M5, and /M6. For a more thorou tionalit to the pin description table that appears later in this document.

When actual recordin

le beep (if the BE pin is high to enable the beep tone) at the speaker outputs to indicate that it has started recordin Recordin The risin record stops the recording operation (indicated with a single beep

If the messa maximum allocated duration, recordin

indicated with two beeps), regardless of the state of the mes-

e trigger pin. The chip then enters low-power mode until

the messa

er pin returns to high, the chip enters standby mode. An subsequent high to low transition on the same message trig-

er pin will initiate recording from the beginning of the same

of device pins in different modes please refer

begins the device responds with a sin-

continues as long as the message pin stays low.

edge of the same message trigger pin durin

e trigger pin is held low beyond the end of the

e trigger pin returns high. After the message trig-

h explanation of the func-

message trig-

stops automaticall

Single-Chip Voice Recording & Playback Device for Multiple 40- to 60-Second Messages Page 3

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APR9600 APLUS

message segment. The entire previous message is then overwritten b of the new messa

er pin or the /RE pin during the record operation are ignored

after

until

the new message, regardless of the duration

e. Transitions on any other message trig-

the device enters standby mode.

Functional Description of Playback in Random Access Mode

On power up, the device is ready to record or playback, in an

of the enabled message segments. To playback, /CE must be set low to enable the device and /RE must be set hi

h to disable recording & enable playback. You initiate playback b pin that representin pla is reached. If a hi sa messa

If a different messa pla cated b ment be clock will be encountered before the device starts pla new messa

If a messa pla period of silence, of a duration e samplin to the user of the transition between the end and the be nin

Tape Mode

Tape mode mana tional cassette tape recorders. Within tape mode two options exist, auto rewind and normal. Auto rewind mode confi the device to automaticall messa messa be recorded or pla tional cassette tape recorder.

applying a high to low edge on the message trigger

the message segment you intend to

back. Playback will continue until the end of the message

h to low edge occurs on the

e trigger pin during playback, playback of the current

e stops immediately.

e trigger pin pulses during playback,

back of the current message stops immediately (indi-

one beep) and playback of the new message seg-

ins. A delay equal to 8,400 cycles of the sample

e trigger pin is held low, the selected message is

ed back repeatedly as long as the trigger pin stays low. A

ual to 8,400 cycles of the

clock, will be inserted during looping as an indicator

of the message.

es messages sequentially much like tradi-

rewind to the beginning of the e immediately following recording or playback of the e. In tape mode, using either option, messages must

ed back sequentially, much like a tradi-

same

mes-

the

in-

ures

Function Description Recording in Tape Mode using the

Normal Option

On power up, the device is ready to record or play back, startin

at the first address in the memory array. To record, /CE must be set low to enable the device and /RE must be set low to enable recordin initiates voice recordin

uent rising edge of the /M1_Message pin during recordin stops the recording (also indicated by one beep). If the /M1_Messa memor beeps /M7_END pin for a duration e

, recording will stop automatically (indicated by two

. The device will then assert a logic low on the

. A falling edge of the /M1_Message pin

indicated by one beep). A subse-

e pin is held low beyond the end of the available

ual to 1600 cycles of the sam-

ple clock, re

The device returns to standb pin

oes high again.

After recordin to the be wait for the next user input. The auto rewind function is convenient because it allows the user to immediatel and review the messa ever, caution must be practiced because a subse record operation will overwrite the last recorded messa unless the user remembers to pulse the /M2_Next pin in order to increment the device past the current messa

A subse new record operation, overwritin message. You can preserve the previously recorded messa

e by using the /M2_Next input to initiate recording in the next available messa the /M2_Next pin must be pulled low for at least 400 c the sample clock.

The auto rewind mode allows the user to record over the previous messa first to sa

e however requires a different sequence. You must pulse the /CE pin low once to rewind the device to the be the voice memor for the specified number of times to move to the start of the messa messa previousl sa

e it becomes the last available message and all previousl

recorded messages following this message become inaccessible. If durin memor

double beep) and set the /M7_END pin low for a duration

ual to 1600 cycles of the sample clock. Playback can be initiated on this last messa will put the device into an “overflow state”.

Once the device enters an overflow state an pulsin ble beep and settin e

ual to 400 cycles of the sample clock. To proceed from this state the user must rewind the device to the be memor pin low or c i

nored during recording.

ardless of the state of the /M1_Message pin.

mode when the /M1_Message

is finished the device will automatically rewind

inning of the most recently recorded message and

playback

e without the need to rewind. How-

uent

uent falling edge on the /M1_Message pin starts a

the previously existin

e segment. To perform this function,

cles of

e simply by initiating a record sequence without

ling the /M2_Next pin. To record over any other mes-

inning of

.The /M2_Next pin must then be pulsed low

ou wish to overwrite. Upon arriving at the desired

e a record sequence can be initiated to overwrite the

recorded material. After you overwrite the mes-

a record operation all the available

is used the device will stop recording automatically,

e, but pulsing the /M2_Next pin

subsequent

of /M1_Message or /M2_Next will only result in a dou-

of the /M7_END pin low for a duration

inning of the

array. This can be accomplished by toggling the /CE

cling power. All inputs, except the /CE pin, are

Page 4 Single-Chip Voice Recording & Playback Device for Multiple 40- to 60-Second Messages

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APLUS

APR9600

Function Description of Playback in Tape Mode using the Normal Option

On power-up, the device is ready to record or play back, startin

at the first address in the memory array. Before you can be enable the device and /RE must be set to hi recordin pulse of the /M1_Message pin initiates playback from the be sa pulses low the second time, pla stops immediatel third time, pla its be ousl fashion. A 1,530 ms period of silence is inserted during loopin be

Note that in auto rewind mode the device alwa the be

current messa accomplished b The pulse must be low for least 400 c clock. After the device is incremented to the desired message the user can initiate pla back se the /M2_Next pin current messa the next messa

Note that if /M2_Next goes low when not in playback mode, the device will prepare to pla actuall

If the /CE pin rent messa be pla

When

a double beep. To proceed from this state the user must rewind the device to the be can be accomplished b power.

in playback, the /CE input must be set to low to

h to disable

and enable playback. The first high to low goin

inning of the current message; on power up the first mese is the current message. When the /M1_Message pin

back of the current message

. When the /M1_Message pin pulses low a

back of the current message starts again from

inning. If you hold the /M1_Message pin low continu-

the same message will play continuously in a loopin

as an indicator to the user of the transition between the

inning and end of the message.

s rewinds to

inning of the current message. To listen to a subse-

uent message the device must be fast forwarded past the

e to the next message. This function is

toggling the /M2_Next pin from high to low.

cles of the samplin

back of the message with the play-

uence described above. A special case exists when

oes low during playback. Playback of the

e will stop, the device will beep, advance to

e and initiate playback of the next message.

the next message, but will not

initiate playback).

oes low during playback, playback of the cur-

e will stop, the device will beep, reset to the

inning of the first message, and wait for a subsequent

back command.

ou reach the end of the memory array, any subse-

uent pulsing of /M1_Message or /M2_Next will only result in

inning of the memory array. This

toggling the /CE pin low or cyclin

Functional Description of Recording in Tape Mode using Auto Rewind Option

On power-up, the device is ready to record or play back, startin

at the first address in the memory array. Before you can be enable the device and /RE must be set to low to enable recordin device will beep once and initiate recordin risin insert a sin

in recording, the /CE input must be set to low to

. On a falling edge of the /M1_Message pin the

. A subsequent

edge on the /M1_Message pin will stop recording and

le beep. If the /M1_Message pin is held low

ond the end of the available memory, recording stops automaticall state of the /M1_Messa standb

A subse new record operation in the memor lowin recorded messa

To record over all previous messa pin low once to reset the device to the be messa described above, to record a new messa recentl messa messa

ou wish to preserve any current messages it is recom-

If mend that Auto Rewind option be used instead of Normal option. If Normal option is necessar can be used. To preserve current messa forward past the messa record a new messa mal option sa

es sequentially until you arrive at the beginning of the messa switch back to record mode and overwrite the desired messa

e. The most recently recorded message will become the last recorded messa followin except /CE are i

, and two beeps are inserted; regardless of the

e pin. The device returns to the

mode when the /M1_Message pin is returned high.

uent falling edge on the /M1_Message pin starts a

array immediately fol-

the last recorded message, thus preserving the last

es you must pulse the /CE

inning of the first

e. You can then initiate a record sequence, as

e. The most recorded message will become the last recorded e and all previously recorded messages following this e will become inaccessible.

the following sequence

es you must fast

es you want to keep before you can

e. To fast forward when using the Nor-

ou must switch to play mode and listen to mes-

ou wish to overwrite. At this stage you should

e and all previously recorded messages

this message will become inaccessible. All inputs,

nored during recording.

Functional Description of Playback in Tape Mode using Auto Rewind Option

On power-up, or after a low to high transition on /RE the device is read address in the memor of messa device and /RE must be set to hi first hi

h to low going pulse of the /M1_Message pin initiates

pla

back from the beginning of the current message. When the /M1_Messa pla

back of the current message stops immediately. When the /M1_Messa pla

back of the next message starts again from the beginnin

. If you hold the /M1_Message pin low continuously, the current messa one of the followin array is reached, the last message is reached, the /M1_messa has alread /M1_Messa the /M7_END pin will the /CE pin low once durin the be

inning of the first message.

to record or play back starting at the first

array. Before you can begin playback

es, the /CE input must be set to low to enable the

h to enable playback. The

e pin pulses from high to low a second time,

e pin pulses from high to low a third time,

e and subsequent messages play until the

conditions is met: the end of the memor

e pin is released. If the last recorded message

played, any further transitions on the

e pin will initiate a double beep for warning and

o low. To exit this state you must pulse

standby to reset the pointer to

Single-Chip Voice Recording & Playback Device for Multiple 40- to 60-Second Messages Page 5

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APLUS

Microprocessor Controlled Message Management

The APR9600 device incorporates several features designed to help simplif ment. When controllin tiall

toggles pins as described in the message management sections describe previousl /M7_END pins are included to simplif the microprocessor and the APR9600

The /Bus the device is bus accepted. When this pin is high the device is ready to accept and execute commands from the host.

The /Strobe pin pulses low each time a memor used. Countin to accuratel used, and how much recordin has a total of ei

The /M7_END pin is used as an indicator that the device has stopped its current record or pla recording a low going pulse indicates that all memory has been used. Durin last messa

Microprocessor control can also be used to link several

APR9600

recordin microphone si processor will then control which device currentl speaker b respective /CE pins. A continuous messa recorded in multiple devices however because the transition from one device to the next will incur a dela able upon pla messa

microprocessor controlled message manage-

messages the microprocessor essen-

. The /Busy, /Strobe, and

handshaking between

pin when low indicates to the host processor that

and that no commands can be currentl

segments is

pulses on this pin enables the host processor

determine how much recording time has been

time remains. The APR9600

memory segments.

back operation. Durin

playback a low pulse indicates that the

e has played.

devices to

time. In this application both the speaker and

enabling or disabling each device using their

e boundaries and device boundaries always coincide.

ether in order to increase total available

nals can be connected in parallel. The micro-

drives the

e can not be

that is notice-

back. For this reason it is recommended that

APR9600

her sampling rates increase the bandwidth and hence the

Hi voice same len fewer memor capabilities of the device, but the nal bandwidth. The APR9600 accommodates samplin as hi

An internal oscillator provides the APR9600 samplin Oscillator fre tance from the OscR pin to GND. Table 2 summarizes resistance values and the correspondin well as the resultin

Table 2 Reference Rosc Value & Sampling Frequency

uality, but they also use more memory cells for the

th of recording time. Lower sampling rates use

cells and effectively increase the duration

also reduce incoming sig-

rates

h as 8 kHz and as low a 4 kHz. You can control the uality/duration trade off by controlling the sampling freuency.

clock.

uency can be changed by changing the resis-

sampling frequencies, as

input bandwidth and duration.

Sampling

Ref Rosc

84 KW 4.2 kHz 2.1 kHz 60 sec 38 KW 6.4 kHz 3.2 kHz 40 sec 24 KW 8.0 kHz 4.0 kHz 32 sec

NOTICE: Rosc table above is for reference only,different lots ICs will have somewhat different Rosc value performance..

Frequency

Input Bandwidth Duration

Signal Storage

The APR9600 samples incoming voice signals and stores the instantaneous volta or

cells. Each memory cell can support voltage ranges from

0 to 256 levels. These 256 discrete volta

uivalent of 8-bit (28=256) binary encoded values. Durin

e playback the stored signals are retrieved from memory, smoothed to form a continuous si before bein

fed to an external speaker.

e samples in non-volatile FLASH mem-

e levels are the

nal, and then amplified

Sampling Rate & Voice Quality

According to the Shannon’s sampling theorem, the highest possible fre samplin plin

frequency if aliasing errors are to be eliminated. The

APR9600 automaticall

samplin

Page 6 Single-Chip Voice Recording & Playback Device for Multiple 40- to 60-Second Messages

uency component introduced to the input of a

stem must be equal to or less than half the sam-

filters its input, based on the selected

frequency, to meet this requirement.

+ 12 hidden pages

Aplus APR9600 Service Manual

Specifications and Main Features

Frequently Asked Questions

User Manual