How to read 25LC040 Eeprom?

[GreatVortex]

How can i read an 25LC040 Eeprom? thx

 

[alexan_e]

In order to read the eeprom you read the data-sheet first.

 

[GreatVortex]

i read it but wasnt helpfull. I tried with pickit 2 but i get only 0-s.

 

[alexan_e]

So you are trying to read the eeprom using a pickit 2?

 

[GreatVortex]

I tried but without luck. Thats why i asked how to read it.

 

[alexan_e]

I have no idea about pick it 2 but maybe you can use pony prog

 

[myru28]

Well, first of all Pickit2 Readme doesn't say that it supports 25LC040, just 25LC040a so you shouldn't expect it to read the memory properly, although it might work.

Anyway, have you done the circuit for R/W the memory as shown on that file?, I mean:

Connections for 25LC devices
---------------------------------------
PICkit 2 Pin 25LC Device Pin (DIP)
(1) VPP 1 nCS
(2) Vdd 8 Vcc
(3) GND 4 Vss
(4) PGD 2 SO
(5) PGC 6 SCK
(6) AUX 5 SI
7 nHOLD - disabled (Vdd)
3 nWP - disabled (Vdd)
If it hasn't been the case, this circuit is not too time consuming to build so you could give it a try and see if it can read the memory.

If this doesn't work maybe you'd have to use a microcontroller that supports SPI communication and connect it to the memory and make a code for reading and writting via SPI from/to the memory, although this would be the hardest way to be able to read it, I guess there have to be memory programmers that are able to read and write that memory properly, but I just know Pickit 2 so I cannot help you with that.

Good luck.