1Wire serial EEPROM, DS28EC20 and similar, any experience?

[HenrikOlsson]

1) Are there any PIC chips with 4KB of EEPROM available?

I don't know, haven't checked but I did not say EEPROM, I said FLASH. You can store things in the program memory, after all that's how the program is held in there right.

2) I tried, can't make it work.

Allright, post your code and we might be able to help.

3) Also does not work.

Allright, post your code and we might be able to help.

4) Running on PIC16F887, code is already tight

Use something slightly more modern then. 18F46K42 has 64k of FLASH and 4k of RAM, 18F47K42 doubles that again and they are both cheaper than the old 16F887.

5) No open source hardware/software in my projects ever

OK, yet you're scouring the forum for code to use - strange.

6) Actually they do work fine.

Well, there you go - in that case use it.

And regarding the DS28EC20, if you noted, topic reads "DS28EC20 and similar" This means, that in case of need, say, DS2505 can be used, which has 64k.

As far as I can see the DS2505 is 16kbit, not 64kbit. It can talk to the uC at 16.3kbit / second - that's insanely slow even compared to I2C (if speed doesn't matter then fine, no problem). And it's an "add-only" memory meaning you can program it over the 1-wire bus but one time only, there's no way to erase it.

/Henrik.