Need EEPROM reader/programmer don't know which one:(

[arkadiyp]

I am looking for an EEPROM reader that can read the following eeproms in-circuit 24c08, 24c01, 24c03, 93c46 all of those manufactured by ATMEL.

Also does anyone know how 24rf08 is different from 24c08, atmel site says they should be the same except for RF interface, however for some reason reading 24RF as 24C corrupts it.

Thank you.

 

[Nigel Goodwin]

I am looking for an EEPROM reader that can read the following eeproms in-circuit 24c08, 24c01, 24c03, 93c46 all of those manufactured by ATMEL.

There are plenty of EEPROM programmers about, and they are quite simple to build yourself - the problem is your in-circuit prgoramming requirement. As I understand it the circuit in question has to be designed to allow this, many Sony TV's have a socket for reading/writing the EEPROM - one of the pins on this socket is used to disable the TV's internal uP allowing the EEPROM programmer to take over the bus as I2C master.

 

[arkadiyp]

I am looking for an EEPROM reader that can read the following eeproms in-circuit 24c08, 24c01, 24c03, 93c46 all of those manufactured by ATMEL.

There are plenty of EEPROM programmers about, and they are quite simple to build yourself - the problem is your in-circuit prgoramming requirement. As I understand it the circuit in question has to be designed to allow this, many Sony TV's have a socket for reading/writing the EEPROM - one of the pins on this socket is used to disable the TV's internal uP allowing the EEPROM programmer to take over the bus as I2C master.

What would happen if the circuit does not allow in-circuit programming? Will I damage the eeprom or the circuit or both?

 

[Nigel Goodwin]

What would happen if the circuit does not allow in-circuit programming? Will I damage the eeprom or the circuit or both?

It shouldn't, all it will do is stop the bus working - as I2C uses an open collector bus it will just confuse things - you 'may' be really unlucky, and send a valid signal on the bus and corrupt something, but the chances are very low.

A common failure mode in TV's is one of the chips shorting the I2C bus out, replacing that one IC cures the problem.