which eeprom ?
henrib75
Posts: 11
in Propeller 1
Hello, I'm building a circuit board with the Propeller 1, but I don't know which 32kx8 EEPROM to use (for booting). I'm looking for a through-hole (not surface-mount) EEPROM. Do you have a compatible model you could recommend for the Propeller 1? Thanks.
Comments
Microchip 24LC256, typically, if I remember. You can also go with a 64K EEPROM (like the 24LC512), which works the same, but you can use the extra storage for your own data.
This is only useful if you really, really need to write a lot....
I built a p1 board that constantly hammered the 'EEPROM' with writes. (Needed to continue where left off after power event) it's not available in DIP anymore, but FRAM is almost infinitely writable (From the data sheet: High-endurance 100 trillion (1014) read/writes.") kinda 'spensive tho. FM24V05-GTR. Drop-in replacement for 24LC512. (Writes a lot faster too..)
Adapter boards to make this into a DIP for breadboard, etc are available on Amazon, and really don't require 'expert' soldering either.
That's right, FRAM is destructive reads. I'd forgotten that.
I always use the 64K part (24LC512) in my P1 products; this allows me to have non-volatile storage that is not overwritten by a download/application change. An example is a P1 laser tag controller; the lower 32K is used for the specific application (setup mode, player mode, referee mode) while the data used by the system is stored in the upper 32K.
An example:
-- https://www.digikey.com/en/products/detail/microchip-technology/24LC512-I-P/523018
If you only need 32K
-- https://www.digikey.com/en/products/detail/microchip-technology/24LC256-I-P/273431
Thanks everyone!
Actually, this morning I couldn't find a link to a "cross-platform" version; I only found CMS links... I must not have been fully awake (I'm in France). Thanks!
https://www.digikey.fr/en/products/detail/microchip-technology/24LC512-I-P/523018
https://www.digikey.fr/en/products/detail/microchip-technology/24LC256-I-P/273431