ATMEL 24C512 EEPROM Problem

Started by cfrysinger2000 June 21, 2006
Hello,

I am trying to access an ATMEL 24C512 EEPROM and am having quite a bit
of difficulty. I think have everything wired correctly and the BX24
seems to be sending out the correct pulses but I'm getting nothing
back from the EEPROM. When I wait for it's acknowledgement, nothing
happens. I am pulling up both SCL and SDA and the BX24 can pull them
down but the memory never changes it.

I have two of the chips and they both do the same thing so I don't
know if I ruined both of them or if I'm just screwing something up.

Anyone used one of these and have any words of wisdom or good write-
ups? I can find a lot of info on SPI EEPROM but not two wire serial.

Thanks in advance for any suggestions.

Hello;

I had to replace my EEPROM about a year ago. Don't make the mistake I
made and try to put a 64K part in it's place; the control signals are
different for the 64K part and it won't work. I made a connector and ran
some wires to the circuitboard that the BX-24 was plugged in to and put a
DIP sized EEPROM there. Still works perfectly over a year later.

Schematic
http://www.geocities.com/flightdata_recorder/FDR_Schematic_External_EEPROM_v1.0.GIF

Added connector pins to the of the BX-24 Module
http://www.geocities.com/flightdata_recorder/2005_04_02_EEPROM_001.jpg

Added connector and wire with a strain-relief
http://www.geocities.com/flightdata_recorder/2005_04_02_EEPROM_003.jpg

Wired to DIP socket
http://www.geocities.com/flightdata_recorder/2005_04_02_EEPROM_004.jpg

Homepage
http://www.geocities.com/flightdata_recorder/
Good Luck!
Ken_S.

At 07:10 PM 6/21/2006, you wrote:
>Hello,
>
>I am trying to access an ATMEL 24C512 EEPROM and am having quite a bit
>of difficulty. I think have everything wired correctly and the BX24
>seems to be sending out the correct pulses but I'm getting nothing
>back from the EEPROM. When I wait for it's acknowledgement, nothing
>happens. I am pulling up both SCL and SDA and the BX24 can pull them
>down but the memory never changes it.
>
>I have two of the chips and they both do the same thing so I don't
>know if I ruined both of them or if I'm just screwing something up.
>
>Anyone used one of these and have any words of wisdom or good write-
>ups? I can find a lot of info on SPI EEPROM but not two wire serial.
>
>Thanks in advance for any suggestions.
>
I don't know if this will help you, but you might have a look. I have
implemented some code for accessing the I2C version of Ramtron's
FM24C256 EEProm. You can download the code at the ZBasic Files forum at
http://www.zbasic.net/forum/ Look for the topic "My FRAM module
routines" Just download the routines and see if they are helpful. ZBasic
is compatable with BasicX at this code level.

HTH

I would appreciate hearing if this was helpful.

Vic

--

*____________________________________________________________________________________________*

*Victor Fraenckel
KC2GUI
victorf ATSIGN windreader DOT com**
*