How to tell if an EEPROM chip is bad?

annqisn

How to tell if an EEPROM chip is bad? [Copy link]

 

 I'm currently working on TMS320F28034 to test the read and write programs of AT24C08, but I can't control the EEPROM chip. I want to make sure if the chip is broken?

damiaa

If you want to see if the chip is broken, you can replace it. Or use an EEPROM burning device to determine. Debugging the program: If you have something to write data into it, call the read command first. If not, you still have to write first, and then read the result. If you have an oscilloscope or logic analyzer, you can look at the waveform to check for problems. You can also understand the code well. Try it a few more times and it should work.

ddllxxrr

Write it in, read it out again, if it's wrong then it's bad

chunyang

You have to make sure your program is ok. Almost all common programmers support 24C08, and you can find out by testing it with a programmer.

elvike

Yes, you need to make sure the program is ok, take a good look at the datasheet, confirm whether the timing is ok, and then consider changing the IC.

annqisn

Thank you for your reply. Currently, data cannot be written (data written to the "send buffer register" is not automatically assigned to the "shift register"), and the read value is not correct. There is no waveform when observing with an oscilloscope. SCL and SDA are always high. The loopback mode of the I2C module is tested and there is no problem. The program is used on AT24C64. The timing of reading and writing is slightly changed. It has been checked several times and no problem is found. The board is also replaced, but it still does not work. I want to know if it is possible to determine whether the chip is broken without disassembling it?

tiankai001

annqisn posted on 2018-12-6 08:30 Thank you for your reply. Currently, data cannot be written (the data written to the "send buffer register" is not automatically assigned to the "shift register"), and reading...

still requires checking the timing. Check whether the ACK is correct for each step of reading and writing. Only when the ACK is correct can the reading and writing continue.

annqisn

There is no waveform, it is always high level.

dfwisdom

I also encountered this problem. The EEPROM I am using now is 24512BPR. Can anyone tell me what tools or software I can use to verify the read and write of this chip and whether the storage of the chip is normal? Urgent, urgent, urgent, thank you

chunyang

annqisn posted on 2018-12-6 08:30 Thank you all for your replies. Currently, data cannot be written (the data written to the "transmit buffer register" is not automatically assigned to the "shift register"), and read...

From your description, there are no SCL and SDA signals. It is obviously a program problem and has nothing to do with the quality of the chip, unless these two pins are short-circuited to the power supply.

annqisn

Thanks for your enthusiastic recovery, the problem has been solved, it was a pin configuration problem. The hardware is good.

qwqwqw2088

annqisn posted on 2018-12-6 15:25 Thank you for your enthusiastic recovery. The problem has been solved. It is a problem of pin configuration. The hardware is good.

It is good that it can be solved. It seems that the EEPROM chip configuration is not correct and it is easy to be misunderstood.

tiankai001

annqisn posted on 2018-12-6 15:25 Thank you for your enthusiastic recovery. The problem has been solved. It is a pin configuration problem. The hardware is good.

Could it be that the voltage levels of the device address configuration pins A0, A1, and A2 are not connected correctly, resulting in incorrect device addresses?

star_66666

Just look at the waveform.