Post by thread:EEPROM with two (or three) wires interface...

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

-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 >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 -----BEGIN PGP SIGNATURE----- Version: PGPfreeware 6.5.2 for non-commercial use <http://www.pgp.com> iQA/AwUBOPIPuIFlGDz1l6VWEQJPhACfRq4tjmsS8LpCbSGoWscv9LTjyeMAn0I1 V0NSyb8U0tpCEay9k41CEdXN =raqI -----END PGP SIGNATURE-----

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, =-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-= Spehro Pefhany --"it's the network..." "The Journey is the reward" .....speffKILLspam@spam@interlog.com Info for manufacturers: http://www.trexon.com Embedded software/hardware/analog Info for designers: http://www.speff.com Contributions invited->The AVR-gcc FAQ is at: http://www.bluecollarlinux.com =-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=

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}> > 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.

>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

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

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

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).