Rainbow Electronics APR6016 User Manual

APLUS INTEGRATED CIRCUITS INC.

APR6016

Voice Recording & Playback Device

16 Minute Duration

Features

•Multi-level analog storage

-High quality audio recording and playback

•Dual mode storage of analog and/or digital data

-Eliminates the need for separate digital memory

•Advanced, non-volatile Flash memory technology

-No battery backup required

•SPI interface

-Allows any commercial microcontroller to control the device

•Programmable Sampling Clock

-Allows user to choose quality and duration levels

•Single 3V power supply

•Low power consumption

-Playback operating current: 15 mA typical

-Standby current: 1 uA maximum

-Automatic power-down

•Multiple package options available

-CSP, PDIP, Bare Die

•On-board clock prescaler

-Eliminates the need for external clock dividers

•Automatic squelch circuit Reduces background noise during quiet passages

General Description

Figure 1 APR6016 Pinout Diagrams

The APR6016 offers non-volatile storage of voice and/or data in advanced Multi-Level Flash memory. Up to 16 minutes of audio recordin imum of 30K bits of di devices can be cascaded for lon

g and playback can be accommodated. A max-

gital data can be stored.

APR6016

ger duration recording or greater digital storage. Device control is accomplished throu

gh an industry standard SPI interface that allows a microcontroller to mana This flexible arran messa

ging options. The APR6016 is ideal for use in cellular and cordless phones, telephone answerin di

gital assistants, personal voice recorders, and voice pag-

ers.

APLUS Integrated

lity

by usin

i mplemented in an advanced non-volatile Flash memory

logy

g a proprietary analog multi-level storage te

process. Each memory cell can typically store 256 volta levels. This allows the si

gnals in their natural form, eliminating the need for en

ding

and compression which can introduce distortion.

2002/5/10 Page 1

ge message recording and playback.

gement allows for the widest variety of

g devices, personal

achieves this high level of storage capabi-

chno

APR6008 voice

reproduce audio

co-

/CS

VSSD

NC NC NC

ANAOUT-

ANAOUT+

l -

/RESET

VSSA

AUDOUT

SQLCAP

1 2 3 4 5 6 7 8 9 10 11 12 13 14

28 pin DIP

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

SCLK VCCD EXTCLK /INT SAC VSSA NC /BUSY NC NC VCCA ANAIN+ ANAIN/SQLOUT

Preliminary

g g

APR6016 Data Sheet

Functional Description

The EXTCLK pin allows the use of an external samplin clock. This input can accept a wide range of frequencies dependin that follows the clock. Alternativel nal oscillator can be used to suppl Mux followin si

nal if a clock is present, otherwise the internal oscillator source is chosen. Detailed information on how to pro divider and internal oscillator can be found in the explanation of the

Command Description

the appropriate sample clock fre

Sampling Rate & Voice Quality

The audio si should be fed into the differential inputs ANAIN-, and ANAIN+. After pre-amplification the si anti-aliasin its response based on the sample rate bein nal anti-aliasin

After passin the sample and hold circuit which works in con the Analo flash memor

on the divider ratio programmed into the divider

, the programmable inter-

the sampling clock. The

both signals automatically selects the EXTCLK

PWRUP

command, which appears in the

section. Guidance on how to choose

uency can be found in the

section.

nal containing the content you wish to record

nal is routed into the

filter. The anti-aliasing filter automatically adapts

used. No exter-

filter is therefore required.

through the anti-alias filter, the signal is fed into

Write Circuit to store each analog sample in a

cell.

OpCode

unction with

ram the

When a read operation is desired the Analog Read Circuit extracts the analo the si

nal to the Internal Low Pass Filter. The low pass filter converts the individual samples into a continuous output. The output si ferential output driver. The differential output driver feeds the ANAOUT+ and ANAOUT- pins. Both differential output pins swin

The s si control si reducin mation, refer to the

After passin

oes to the output amplifier. The output amplifier drives a sinle ended output on the AUDOUT pin. The single ended out-

put swin

All SPI control and hand shakin Master Control Circuit. This circuit decodes all the SPI si and the status re the APR6016.

nal then goes to the squelch control circuit and dif-

around a 1.23V potential.

uelch control circuit automatically reduces the output

nal by 6 dB during quiet passages. A copy of the squelch

nal is present on the /SQLOUT pin to facilitate

ain in the external amplifier as well. For more infor-

s around a 1.23V potential.

enerates all the internal control signals. It also contains

data from the memory array and feeds

Squelch

through the squelch circuit the output signal

ister used for examining the current status of

section.

signals are routed to the

nals

Figure 2 APR6016 Block Diagram

/RESET

/BUSY

SAC

/INT

/CS

SCLK

EXTCLK

Row Address

Master Control Circuit

3.84 Mcell Memory Array

Row Decoder

Column Address

Programmable Internal

Oscillator

Programmable Divider

Single Analog Memory Cell

Column Decoder

Analog input/output to Memory array

Mux

Low Pass

Write Circuit

Read Circuit

Low Pass

Squelch

Pre-

Amp

ANAIN+

ANAIN-

ANAOUT+

ANAOUT-

AUDOUT

SQLCAP /SQLOUT

Page 2 Voice Recording & Playback Device

Revision 1.0

Preliminary

)

(

)

ying

APR6016 Data Sheet

Memory Organization

The APR6016 memory array is organized to allow the greatest flexibilit The smallest addressable memor The APR6016 contains 1280 sectors.

in message management and digital storage.

unit is called a “sector”.

Figure 3 Memory Map.

SAC Trigger Point

Sector 0

Sector 1

Sector 1279

Sectors 0 through 1279 can be used for analog storage. Durin

audio recording one memory cell is used per sample clock c bit is programed into the memory. This prevents playback of silence when partial sectors are used. Unused memor exists between the EOD bit and the end of the sector can not be used.

Sectors 0 throu stora store data but have not been tested, and are thus not teed to provide 100% error correction or forward check-before-store methods. Once a write c chosen sector is lost.

Mixin not possible.

cle. When recording is stopped an end of data (EOD

e. Other sectors, with the exception of sector 1279, can

audio signals and digital data within the same sector is

Note: There are a total of 15bits reserved for addressing. The APR6016 only requires 11 bits. The additional 4 bits are used for larger device within the APR60XX family.

Can Not be Used for Digital Data

that

h 9 are tested and guaranteed for digital

uaran-

ood bits. This can be managed with

cle is initiated all previously written data in the

SPI Interface

All memory management is handled by an external host processor. The host processor communicates with the APR6016 throu

h a simple Serial Peripheral Interface (SPI) Port. The SPI port can run on as little as three wires or as man seven dependin section will describe how to mana APR6016's SPI Port and associated OpCode commands. This topic is broken down into the followin

• Sendin

• OpCode Command Description

• Receivin

• Current Device Status

• Reading the Silicon Identification (SID)

•Writin

• Readin

• Recordin

•Pla

• Handshakin

Sending Commands to the Device

This section describes the process of sendin the APR6016. All Opcodes are sent in the same wa exception of the The in the that follow. The minimum SPI confi commands uses the DI, /CS, and SCLK pins. The device will accept inputs on the DI pin whenever the /CS pin is low. OpCode commands are clocked in on the risin SPI clock. Fi OpCode commands into the device. Figure 5 is a description of the OpCode stream.

You must wait for a command to finish executin in /BUSY pin. You can substitute monitorin inserting a fixed delay between commands. The required dela shows the timin mands. Table 1 describes which

Digital Data

Back Audio Data

DIG_WRITE and DIG_READ

Writing Digital Data

a new command. This is accomplished by monitoring the

is specified as

on the amount of control necessary. This

e memory using the

sections:

Commands to the Device

Device Information

CDS

Digital Data

Audio Data

Signals

OpCodes to

DIG_WRITE

and

ure 4 shows the timing diagram for shiftin

next1,Tnext2,Tnext3

diagram for sending consecutive com-

DIG_READ

and

commands

are

Reading Digital Data

uration needed to send

edge of the

before send-

of the busy pin b

or T

next4

specification to use.

commands

. Figure 6

with the

described

sections

Voice Recording & Playback Device Page 3 Revision 1.0

Preliminary

APR6016 Data Sheet

Figure 4 Sending SPI Commands

/CS

SCLK

hiSCLK

, T

next1

next2

next3

next4

fCS

Figure 5 OpCode Format

Op4 Op3 Op1 Op0 A14 A13 A12 A11 A10 A9 A8 A7 A6Op2

Op4

First bit shifted in

Op3

Op2 Op1

suDI

pSCLK

{

OpCode Command OpCode Parameter

Figure 6 Opcode Stream Timing

rCS

loSCLK

A5 A4 A3 A2 A1

A1A2

hDI

Last bit shifted in

{

SCLK

/CS

Page 4 Voice Recording & Playback Device

Current Com mand Next Command

next1,Tnext2,Tnext3,Tnext4

Revision 1.0

Preliminary

APR6016 Data Sheet

Table 1 Sequential Command Timing

Current Command Next command Timing Symbol

NOP

Any Command T

SID PWRUP

Any Command T

STOP_PWDN PWRUP

SET_REC

STOP, STOP_PWDN, SET_REC, REC,NOP REC SET_PLAY

STOP, STOP_PWDN, SET_FWD, FWD, SET_PLAY,PLAY, NOP PLAY SET_FWD

SET_FWD, FWD, STOP, STOP_PWDN FWD DIG_WRITE DIG_READ DIG_ERASE STOP

Any Digital Command,

Note: For partial DIG_READ T

rise of /CS, not from the rise of /CS

Any Command T

STOP, STOP_PWDN

is measured from the extra clock low that follows the 8K sampling rate: 376m SEC

next3

OpCode Command Description

Designers have access to a total of 14 OpCodes. These OpCodes are listed in Table 2. The name of the Opcode appears in the left hand column. The followin represent the actual binar

information contained in the 20 bit

data stream. Some commands have limits on which com-

two columns

next1 5u SEC

next2 5m SEC

Within SAC Low Time

next3

4K sampling rate: 752m SEC

next4 470m SEC

mand can follow them. These limits are shown in the “

able Follow on Commands

” column. The last column

Allow-

summarizes each command.

Combinations of OpCodes can be used to accommodate almost an

memory management scheme.

Table 2 APR6016 Operational Codes

Instruction

Name

NOP

SID

SET_FWD

FWD

PWRUP

STOP

STOP_PWDN

Voice Recording & Playback Device Page 5 Revision 1.0

OpCode

(5 bits) Opcode Parameters (15bits)

[Op4 - Op0]

[00000] [Don’t Care] All Commands No Operation [00001] [Don’t care] All Commands Causes the silicon ID to be read. [00010] Sector Address

[00011] [Don’t care] SET_FWD,

[00100] [A14-A10]: all zeros

[00110] [Don’t care] All Commands Stops the current operation.

[00111] [Don’t care] PWRUP Stops the current operation. Causes the

[Address MSB - Address LSB]

[Address 14 - Address 0]

[A14 - A0]

[A9-A2]: EXTCLK divider ratio

[A1-A0]: Sample Rate Frequency

Allowable Follow

on Commands Summary

SET_FWD,

FWD, STOP,

STOP_PWDN

FWD, STOP,

STOP_PWDN

All Commands Resets the device to initial conditions.

Starts a fast forward operation from the sector address specified.

Starts a fast forward operation from the current sector address.

Sets the sample frequency and divider ratios.

device to enter power down mode.

Preliminary

APR6016 Data Sheet

Instruction

Name

SET_REC

REC

DIG_ERASE

DIG_WRITE

DIG_READ

SET_PLAY

PLAY

OpCode

(5 bits) Opcode Parameters (15bits)

[Op4 - Op0]

[01000] Sector Address

[01001] [Don’t care] STOP,

[01010] Sector Address

[01011] [A14 - A0][XXXX][D0 - D3004][XXXX] All Commands This command writes data bits D0 - D3003

[01111] Sector A d dress

[01100] Sector Address

[01101] [Don’t care] STOP,

[Address MSB - Address LSB]

[Address 14 - Address 0]

[A14 - A0]

Allowable Follow

on Commands Summary

STOP,

STOP_PWDN,

SET_REC,

REC,NOP

STOP_PWDN,

SET_REC,

REC,NOP

All Commands Erases all data contained in specified sec-

All Commands This command reads data bits D0 - D3003

STOP,

STOP_PWDN,

SET_FWD, FWD,

SET_PLAY,PLAY,

NOP

STOP_PWDN,

SET_FWD, FWD,

SET_PLAY,PLAY,

NOP

Starts a record operation from the sector address specified.

Starts a record operation from the current sector address.

tor. You must not erase a sector before recording voice signals into it. You must erase a sector before storing digital data in it.

starting at the specified address. All 3004 bits must be written.

starting at the specified address.

Starts a play operation from the sector address specified.

Starts a play operation from the current sector address.

NOP

The most often used when readin more information on readin

Device Status

THE of its silicon ID re

ing the SID

The from the be

command performs no operation in the device. It is

the current device status. For

device status see the

section.

SID

operation instructs the device to return the contents

ister. For more information see the

section.

SET_FWD

command instructs the device to fast forward

inning of the sector specified in the OpCode

Current

Read-

parameter field. The device will fast forward until either an EOD bit, or the end of the sector is reached. If no EOD bit or forthcomin

command has been received when the end of the sector is reached, the device will loop back to the be nin

of the same sector and begin the same process again. If

an EOD bit is found the device will stop and

enerate an interrupt on the /INT pin. The output amplifiers are muted durin

this operation.

FWD

The

command instructs the device to fast forward from the start of the current sector to the next EOD marker. If no EOD marker is found within the current sector the device will increment to the next se

Page 6 Voice Recording & Playback Device

uential sector and continue looking.

The device will continue to fast forward in this manner until either an EOD is reached, a new command is sent, or the end of the memor the device will stop and The output amplifiers are muted durin

PWRUP

The mode and set the internal clock fre

array is reached. When an EOD is reached

enerate an interrupt on the /INT pin.

this operation.

command causes the device to enter power up

uency and EXTCLK divider ratio. The PWRUP command must be used to force the device into power up mode before an

commands can be executed. To select an Internal oscillator fre [A1 - A0] bits accordin

in-

A1 A0 Sample rate

to the following binary values:

0 0 6.4 kHz 0 1 4.0 kHz 1 0 8.0 kHz 1 1 5.3 kHz

ou are using an external sample clock signal you must

also set the EXTCLK divider ratio. This divider ratio is e

uency set the

ual

Revision 1.0

Preliminary

APR6016 Data Sheet

to N:1 where N is an integer between 1 and 256, excluding 2. The N value should be selected to satisf tion as closel

EXTCLK fre

Example:

Suppose that 8.0 KHz samplin the fre

Roundin

The Op Code Parameter bit stream, composed of bits [A9 - A2][A1 - A0], therefore becomes binar [00001000][10].

STOP

The operation.

STOP_PWDN

The current command and enter power down mode. Durin down the device consumes si PWRUP command must be used to force the device into power up mode before an

SET_REC

The recordin continue to record until the end of the current sector is reached. If no forthcomin when the end of the sector is reached the device will loop back to the be previousl

SET_REC

mand immediatel that no audio information is lost. For more information see the section entitled

REC

The the current sector. If no new command is received before the device reaches the end of the sector the device will automaticall

increment to the next sequential sector and continue recordin until the memor command is received. For more information see the section entitled

DIG_ERASE

The sector specified. Erase should not be done before recordin voice signals into a sector. Erase must be done before storin digital data in a sector.

DIG_WRITE

The the specified sector. All 3K bits must be written, no partial usa

e of the sector is possible. The memory acts as a FIFO, the first data bit shifted in will be the first data bit shifted out. A sector must be erased usin

BEFORE

tion on storin

Digital Data

as possible:

= (N) * (128) * (selected sampling frequenc

uency of the signal present on EXTCLK = 8MHz.

8000000

---------- ------------- --128 8000()

up, N = 8

Command causes the device to stop the current

at the sector address specified. The device will

recorded material. If the next command is another

REC

7.8125==

command causes the device to stop the

nificantly less power. The

commands can be executed.

command instructs the device to begin

command has been received

inning of the same sector and overwrite the

command the device will execute the com following the end of the current sector so

Recording Audio Data

command instructs the device to begin recording in

. The device will continue to record in this manner

is exhausted or a

Recording Audio Data

command erases all data contained in the

command stores 3K bits of digital data in

data can be written to the sector. For more informa-

digital data, see the section entitled

the

the following equa-

is desired. Assume that

power

STOP

DIG_ERASE

STOP_PWDN

command

Writing

DIG_READ

The di

ital data that was previously written to the specified sector. The first bit shifted out is the first bit that was written. The last bit shifted out is the last bit that was written. For more information on readin

command instructs the device to retrieve

digital data see the section entitled

Read-

ing Digital Data.

SET_PLAY

The back at the specified sector. If no forthcomin received, or EOD bit encountered, before the end of the sector is reached the device will loop back to the be same sector and continue pla the audio output. If the next command is another

PLAY

or immediatel

ap in playback is present. For more information see the sec-

tion entitled

PLAY

The the current sector. If no forthcomin EOD bit encountered, before the device reaches the end of the sector the device will automaticall se

uential sector and continue playing. The device will con-

tinue to pla

STOP

a information see the section entitled

command instructs the device to begin play-

command is

inning of the

back with no noticeable gap in

SET_PLAY

command the device will execute the command

following the end of the current sector so that no

Playing Back Audio Data.

command instructs the device to begin playback at

in this manner until the memory is exhausted or

STOP_PWDN

command is received. For more

command is received, or

increment to the next

Playing Back Audio Data.

Voice Recording & Playback Device Page 7 Revision 1.0

+ 16 hidden pages