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'EEPROM with two (or three) wires interface...'
2000\04\10@113617 by Max

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Hello everybody!
It's the first time I write to the list, after a year of listening that
gave to me a lot of precious hints and ideas... thanks a lot!
Currently I'm looking for a serial EEPROM; I want to use it to store
speech samples.
The specifications are
a) biggest size possible
b) smaller price possible ( of course :-))) )

The best I've found is the Microchip 24LC256, but it's small...
The prefect size would be Toshiba (TC58A040F (4Mbit)) but here (in
Italy) is not available in DIP package...
Any suggestions?
TIA
Max

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Massimo Battisti
E-Mail   : spam_OUTbattistiTakeThisOuTspamisa.it
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2000\04\10@114038 by David VanHorn

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>The best I've found is the Microchip 24LC256, but it's small...
>The prefect size would be Toshiba (TC58A040F (4Mbit)) but here (in
>Italy) is not available in DIP package...


Atmel has a 24C512 in dip

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2000\04\10@122945 by Spehro Pefhany

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At 01:23 PM 4/10/00 +0000, you wrote:
>Hello everybody!
>It's the first time I write to the list, after a year of listening that
>gave to me a lot of precious hints and ideas... thanks a lot!
>Currently I'm looking for a serial EEPROM; I want to use it to store
>speech samples.
>The specifications are
>a) biggest size possible
>b) smaller price possible ( of course :-))) )

Not in a DIP package, but Atmel's Dataflash products list up to
32M bit capacity. http://www.atmel.com

The larger ones are in rather fine pitch SMT or BGA packages,
but the smaller ones (starting at 1M bit) are available in
easy-to-use 50-mil pitch SOIC packages and even PLCC.

They're SPI interface, so they should work nicely with any PIC,
(using a bit-banged interface) and particularly with PIC's
with SPI hardware on-chip.

Best regards,

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Spehro Pefhany --"it's the network..."            "The Journey is the reward"
.....speffKILLspamspam@spam@interlog.com             Info for manufacturers: http://www.trexon.com
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2000\04\10@125102 by Wagner Lipnharski

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Yes, the Atmel serial flash AT49F1614 or AT49F1614T is a 16 MegaBit,
dual data wide memory (8 or 16 bits), what is perfect.

It was exactly this flash memory what changed my "desire" to produce an
IDE interface to 1.44MB floppy disk.

I am not quite sure about real time voice recording, because the flash
recording timmings and techniques are not an easy and fast flow, but
reading would not be a problem. At 12 ksamples/second @ 8 bits, this
chip could store as much as 166 seconds... 2.6 minutes!!! without
compression. An ISD chip could give you 8 minutes of recorded audio for
only $11 at Digikey... p/n: ISD4003-08MP-ND it is a 28 pins DIP package,
4 wires interface (SPI), up to 8ksamples/second (4 minutes).

Better details about this chip:
http://www.isd.com/products/chipcorder/datasheets/4003/4003.pdf

Wagner.




Spehro Pefhany wrote:
{Quote hidden}

2000\04\10@132817 by Dan Michaels

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>At 01:23 PM 4/10/00 +0000, you wrote:
>>Hello everybody!
>>It's the first time I write to the list, after a year of listening that
>>gave to me a lot of precious hints and ideas... thanks a lot!
>>Currently I'm looking for a serial EEPROM; I want to use it to store
>>speech samples.
>>The specifications are
>>a) biggest size possible
>>b) smaller price possible ( of course :-))) )
>

Not quite what you were after, but Sony has been advertising large
byte size "memory sticks" - apparently a module about 1/2 size of a
credit card - for such applications.

http://www.sony.com/ms

2000\04\10@162041 by mike

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On Mon, 10 Apr 2000 12:47:21 -0400, you wrote:

>Yes, the Atmel serial flash AT49F1614 or AT49F1614T is a 16 MegaBit,
>dual data wide memory (8 or 16 bits), what is perfect.
>
>It was exactly this flash memory what changed my "desire" to produce an
>IDE interface to 1.44MB floppy disk.
>
>I am not quite sure about real time voice recording, because the flash
>recording timmings and techniques are not an easy and fast flow, but
>reading would not be a problem.
The Atmel devices do have RAM buffers, and the larger ones have two
buffers, so 'continuous' writing is possible - I think about
30KByte/sec is do-able

2000\04\11@023130 by Max

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Thanks to all who answered my question, I will search for Atmel
products...
Just to let you know, the idea that I want to develop is based on a 16F877
for voice recording and playing (with PWM), based on a CDPCM data
compression. This way sampling voice at 8kHz, 16 bit (that will take
16kbyte/sec),  is reduced at 4kbyte/sec; so a 4Mbit flash will give about
130sec of speech... more that enough!!
Thanks again and good work!!
Max

--
---------------------------------------------------
Massimo Battisti
E-Mail   : battistispamKILLspamisa.it
Home Page: http://www.tanzilli.com/users/battisti
Are you a PIC user? Come to my page!
---------------------------------------------------

2000\04\11@055524 by mike

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On Tue, 11 Apr 2000 06:29:13 +0000, you wrote:

>Thanks to all who answered my question, I will search for Atmel
>products...
>Just to let you know, the idea that I want to develop is based on a 16F877
>for voice recording and playing (with PWM), based on a CDPCM data
>compression. This way sampling voice at 8kHz, 16 bit (that will take
>16kbyte/sec),  is reduced at 4kbyte/sec; so a 4Mbit flash will give about
>130sec of speech... more that enough!!
>Thanks again and good work!!
>Max
Might be worth taking a look at the AKM AK4309 audio DAC - an
extremely cheap dac (~$1.50) with all the post-filtering on-board -
bits in, audio out! Can be driven from the PIC SCI in sync mode (needs
inverter in clock and bit-reveresed data).

2000\04\11@072024 by Alan B Pearce

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>Can be driven from the PIC SCI in sync mode
>(needs inverter in clock and bit-reversed data).
                             ^^^^^^^^^^^^^^^^^

So there is a reason (other than PCB foul-ups) for needing those bit reversing
routines that someone was after recently.

Do you have a URL for this company please?

2000\04\11@103815 by Marc

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> The best I've found is the Microchip 24LC256, but it's small...
> The prefect size would be Toshiba (TC58A040F (4Mbit)) but here (in
> Italy) is not available in DIP package...

The AT45D161 is available in PLCC and stores 2 MByte.

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