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If you can provide us more information, maybe we could help you...
Example: whre did you find it, stand-alone or on a pcb, in an existing product, if you have a picture etc...
I have a small PCB mounted with this chip, a few resistors/capacitors and a header. Its an 8-pin SOIC package. I have attached the circuit diagram.
This chip is an EEPROM (SPI probably) because in the past I had PCB with AT25020 which I used to program. I dont know to which hardware these PCBs are interfaced with.
I have a small PCB mounted with this chip, a few resistors/capacitors and a header. Its an 8-pin SOIC package. I have attached the circuit diagram.
This chip is an EEPROM (SPI probably) because in the past I had PCB with AT25020 which I used to program. I dont know to which hardware these PCBs are interfaced with.
from the jpg file and and part show some thing like tone decoder chip 567 for more detial check it data sheet can you upload the board photo graph for more detial
Thanks for your reply. It definitely is an eeprom because when I connect it with an eeprom programmer(doing same connections as for AT25020) only 1st 8 bytes get programmed and the rest unchanged. Still chip pins are not making good sense to me from the schematic
Regards
Shoaib Ali
Hello, i have found the same chip: IM340B / B74299 / 0802X
It's on an ink cartridge. It has replaced a ST 95020 serial EEPROM, so I assume it's similar, but the pin connections are different. I assume the header connections are like this:
H1: Vcc, H2: Vss H3: CS, H4: Clock, H5: Data Input, H6: Data Output
I can read/program only the first byte with a programmer.
Hi
Yes you are right. I am able to read from the chip successfully and reliably. Sometimes I am able to partial right teh chip and very very few times I was able to write the whole chip successfully but this is totally random. The chip behaviour is very deviant from the standard SPI EEProm chips like 95020. Most likely it has something to do with chip pins 1 & 2
Added after 2 minutes:
I am trying to develop a programmer for this chip actually
From the pin information I think it could be a uController. The device generates its own capacitor/resistor clock. Furthermore the device is available but only in limited quantities. Suppliers are either not willing or unable to devulge the source.
Should it be a ucontroller, it may be limiting the number of writes to the memory array. I have also noticed some cells (0x00 thru 0x05) are writable for longer that other cells.
I beleive it to be a propriety device, developed for the application it is used in.
A standard programmer may not be able to successfully write to this device after it has been locked.
hi all
I am from Turkey
İs any one able to read this chip can help me with the schematic
Added after 11 minutes:
shoaibali said:
Hi
Yes you are right. I am able to read from the chip successfully and reliably. Sometimes I am able to partial right teh chip and very very few times I was able to write the whole chip successfully but this is totally random. The chip behaviour is very deviant from the standard SPI EEProm chips like 95020. Most likely it has something to do with chip pins 1 & 2
Added after 2 minutes:
I am trying to develop a programmer for this chip actually
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