Arduino mega multiple EEPROM

Projects General Guidance
1

Hi

I'm hoping someone can guide me to the right way or component to achieve what I need.

Currently I'm using 24lc256 EEPROM, which if I'm correct can hold up to 32,768. The total number of each byte I want to store is 8 bytes which means the max number of records I can store are 4095.

However I have been asked to be able to store 20000 records

So how would I go about this is my best option to link multiple EEPROMs?

Use a SD card?

Also I have seen a 24lc1025 which holds more but can I add multiple of them to the same i2c line

Any help would be great

Thank you

2

You can use an I2C mux to communicate with multiple EEPROMS.

3

That would seem to be a good idea, not least because it makes reading the data back so much easier

4

The EEPROM has address select pins, you should be able to connect several to the same I2C bus with different addresses.

1 Like
5

As a chip? Or as a module? Something like this:
EEPROM Memory module
Has address pins you can set, so multiple memories like this can exist on a single I2C bus.

However, have you considered SD modules for larger volume recording/transfer?

6

Be aware that the A2 address line is not usable (must be VCC if I recall correctly)

You can add eight 24LC256 EEPROMS on one I2C bus without multiplexer.
That would give you 8 x 4096 = 32768 records.

If performance is an issue you could look at FRAM which is much faster than EEPROM .
EEPROM can only be written once every 5 ms ==> about 200 writes / second.

SD cards are of course most flexible.

7

Each byte has 8 bytes ???

8

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