[PIC] Extending storage capacity in EEPROM

[gne_577]

Hello Everyone..!

I am making a project. In which I required around 1,73,250 Bytes of data. I am using two AT24C512 EEPROM in Parallel connection. In this process Im using Single byte write operation not page write operation. According to the datasheet it organized as 65536 words of 8 Bits each.

Is this means that, 1 EEPROM can save upto 65536 bytes.??

Now I'm using two in parallel mode. So Is that means 65536 x 2 = 131072 Bytes..?

If i am going in right direction. So is that any way in which i can store 1,73,250 Bytes of data in it..?

If any possible way is available please let me know. I'm using X8 Compiler in C-Language.

 

[xenos]

...In which I required around 1,73,250 Bytes of data...

Not a numeric format that I understand. You meen 173,250 or 1,730,250?

...AT24C512 EEPROM...Is this means that, 1 EEPROM can save upto 65536 bytes.??

Yes you have 512Kbits (kilo bits) on each, so 512/8 Kbytes, so 64kb (Kilo Bytes). There are also 1Mbit serial eeprom devices (with 128kbytes eatch).

Now I'm using two in parallel mode. So Is that means 65536 x 2 = 131072 Bytes..?

correct

If i am going in right direction. So is that any way in which i can store 1,73,250 Bytes of data in it..?

if you want to store less that 64kb yes. If you need more and there is a possibility of compressing efficiently, then you could.

 

[betwixt]

Is this means that, 1 EEPROM can save upto 65536 bytes.??

Correct!

Now I'm using two in parallel mode. So Is that means 65536 x 2 = 131072 Bytes..?

Correct!

If i am going in right direction. So is that any way in which i can store 1,73,250 Bytes of data in it..?

If you mean 173,250, the answer is no, you need a third AT24C512 because you have run out of space. You could consider moving up to one or two larger sized EEPROMs instead.

Connect them in parallel EXCEPT for the address pins which you hard wire differently on each IC. The bit pattern on the address pins becomes part of the serial address you use to access the memory contents so it becomes easy to talk to one IC or the other.

Brian.

 

[FvM]

I believe, you can find out how many 512kBit EEPROMs are needed to store 1.7 MByte of data, either using a pocket calculator or pencil and paper. Unfortunately, you can't address more than 4 devices on an I2C bus.

There's no simple solution using serial EEPROMs. My suggestion would be a 16 MBit serial SPI flash, if you live with page wise erasure.

If the capacity is only 0.17 MByte, using 3 EEPROMS shouldn't be a problem.

 

[gne_577]

Thank you so much..
your suggestions are really helpful.
I'll use 3 eeproms...