Re: [neonixie-l] Counterfeit RTC modules
I've been thru the process a dozen times -- but using an independent lab that specializes in the process. You should have several samples -- at least 3 should go to a lab, and 3 (unused if possible) to the manufacturer. The manufacturer will also want to see the independent labs' results. The lab will use a Scanning Electron Microscope to verify the origin of the die as real or counterfeit. It can also scan for other types of failures such as ESD or EOS. The manufacturer will run a full parametric test that can definitively ID the part as real or fake -- before decapping. That is, if you are a meaningful volume client for the product. If not, you may just get a run-around. Get the local FAE on your team first. It's expensive, typically the lab charge is $1k for 1 to 5 samples. Terry On Wednesday, January 2, 2019 at 5:01:49 AM UTC-6, Dekatron42 wrote: > > Any chance that you can ask Maxim about this behavior, it could be a bug > in a batch of these ic's. > > Someone here on the forum had the capability of etching away the case on > ic's and looking at the chip if I remember correctly, it would be > interesting if these "fake" ic's could be sent to that person and have this > procedure done to them so we could learn what's inside! > > There are some websites saying these ic's are fakes and some saying they > are true original ic's and having proof of one that behaves badly and then > seeing what is inside would be very interesting, I can't remember ever > having seen such a comparison anywhere. > > /Martin > > On Wednesday, 2 January 2019 01:40:58 UTC+1, gregebert wrote: >> >> Label says DS3231, but it's definitely fake. >> >> I have 2 other clocks with genuine DS3231's (purchased from DigiKey), and >> they have behaved as expected for years. >> > -- You received this message because you are subscribed to the Google Groups "neonixie-l" group. To unsubscribe from this group and stop receiving emails from it, send an email to neonixie-l+unsubscr...@googlegroups.com. To post to this group, send an email to neonixie-l@googlegroups.com. To view this discussion on the web, visit https://groups.google.com/d/msgid/neonixie-l/a7d9da78-9684-4194-8ac3-44e332a562ff%40googlegroups.com. For more options, visit https://groups.google.com/d/optout.
Re: [neonixie-l] Counterfeit RTC modules
Any chance that you can ask Maxim about this behavior, it could be a bug in a batch of these ic's. Someone here on the forum had the capability of etching away the case on ic's and looking at the chip if I remember correctly, it would be interesting if these "fake" ic's could be sent to that person and have this procedure done to them so we could learn what's inside! There are some websites saying these ic's are fakes and some saying they are true original ic's and having proof of one that behaves badly and then seeing what is inside would be very interesting, I can't remember ever having seen such a comparison anywhere. /Martin On Wednesday, 2 January 2019 01:40:58 UTC+1, gregebert wrote: > > Label says DS3231, but it's definitely fake. > > I have 2 other clocks with genuine DS3231's (purchased from DigiKey), and > they have behaved as expected for years. > -- You received this message because you are subscribed to the Google Groups "neonixie-l" group. To unsubscribe from this group and stop receiving emails from it, send an email to neonixie-l+unsubscr...@googlegroups.com. To post to this group, send an email to neonixie-l@googlegroups.com. To view this discussion on the web, visit https://groups.google.com/d/msgid/neonixie-l/0dc01175-fe29-4e2c-89b4-6ee8e264ed9e%40googlegroups.com. For more options, visit https://groups.google.com/d/optout.
Re: [neonixie-l] Counterfeit RTC modules
Label says DS3231, but it's definitely fake. I have 2 other clocks with genuine DS3231's (purchased from DigiKey), and they have behaved as expected for years. -- You received this message because you are subscribed to the Google Groups "neonixie-l" group. To unsubscribe from this group and stop receiving emails from it, send an email to neonixie-l+unsubscr...@googlegroups.com. To post to this group, send an email to neonixie-l@googlegroups.com. To view this discussion on the web, visit https://groups.google.com/d/msgid/neonixie-l/dc76b60d-141d-42e6-8ea9-8626a65eb063%40googlegroups.com. For more options, visit https://groups.google.com/d/optout.
Re: [neonixie-l] Counterfeit RTC modules
Which IC is this? I have a couple of clocks that are gaining time in a similar way to each other. I’ve checked my software and think it must be down to rogue DS3231s. Funny thing is I think the ICs are samples direct from Maxim. John S > On 1 Jan 2019, at 20:43, gregebert wrote: > > Happy New Year, unless you rely on the dirt-chip RTC module I bought several > months ago, because today would be Sept 2, 2018. > > WHAT ??? That's the date my RTC chip reported this morning: 09/02/2018 > Last night, before midnight and right after I got tired of writing software, > it was correct at 12/31/2018. > > The funny thing is, this counterfeit RTC module has kept the time very > accurately over several months. My previous experience with a different fake > chip was that it was losing about 2 hours per day; since this one was > accurately keeping the time I assumed it was a genuine Maxim device. Nay, not > so... > > After resetting the correct date, it's showing that now. So I wonderif > someone went to such lengths to make such a time-wise accurate fake, why > would they bungle so poorly on a simple Dec31 --> Jan01 rollover ? > > Sure enough, when I forced the RTC back just before midnite and let it > roll-over, I got another wrong date (09/01/2018), so this RTC is even more > messed-up than I thought. -- You received this message because you are subscribed to the Google Groups "neonixie-l" group. To unsubscribe from this group and stop receiving emails from it, send an email to neonixie-l+unsubscr...@googlegroups.com. To post to this group, send an email to neonixie-l@googlegroups.com. To view this discussion on the web, visit https://groups.google.com/d/msgid/neonixie-l/4CED66E4-92A3-4179-87DB-AF3F49BF3FAD%40jsdesign.co.uk. For more options, visit https://groups.google.com/d/optout.
Re: [neonixie-l] Counterfeit RTC modules
I don't understand why chinese bother to counterfeit LM2596s, but they do all the same. In fact 99% of the dc buck converters you find on amazon and ebay are counterfeits. -Dan On Thu, 4 Feb 2016, David Forbes wrote: Sorry, but I do not understand this race to the bottom, that produces products that look like products that work. Why not just buy a working chip for the price of a working chip, and save yourself the hassle and disillusionment that comes with a part whose price is clearly too low to be a working product? The odds of the rest of the module working properly are not too high. You might spend hours dealing with the fallout of saving ten dollars. On 2/4/16 8:04 AM, gregebert wrote: Lesson learned: You get what you pay for. I bought a $2 US realtime clock module on Ebay, imported from China, and the DS3231 chip appears to be counterfeit because it was not keeping accurate time. I was suspicious about the price, considering I paid almost $8 US just for the DS3231 from a reputable supplier. Over a few days, it lost about 1 hour of time. After replacing the chip with a genuine Maxim DS3231, it's running correctly. A quick web-search found there are several others who have experienced this. Despite having to replace the RTC chip, the module itself is still worth the price because it included a rechargeable Li-ion coin battery and a serial EEPROM (no time yet to see if that's working correctly...) -- David Forbes, Tucson AZ -- You received this message because you are subscribed to the Google Groups "neonixie-l" group. To unsubscribe from this group and stop receiving emails from it, send an email to neonixie-l+unsubscr...@googlegroups.com. To post to this group, send an email to neonixie-l@googlegroups.com. To view this discussion on the web, visit https://groups.google.com/d/msgid/neonixie-l/56B3F03C.6090903%40dakotacom.net. For more options, visit https://groups.google.com/d/optout.
Re: [neonixie-l] Counterfeit RTC modules
Sorry, but I do not understand this race to the bottom, that produces products that look like products that work. Why not just buy a working chip for the price of a working chip, and save yourself the hassle and disillusionment that comes with a part whose price is clearly too low to be a working product? The odds of the rest of the module working properly are not too high. You might spend hours dealing with the fallout of saving ten dollars. On 2/4/16 8:04 AM, gregebert wrote: Lesson learned: You get what you pay for. I bought a $2 US realtime clock module on Ebay, imported from China, and the DS3231 chip appears to be counterfeit because it was not keeping accurate time. I was suspicious about the price, considering I paid almost $8 US just for the DS3231 from a reputable supplier. Over a few days, it lost about 1 hour of time. After replacing the chip with a genuine Maxim DS3231, it's running correctly. A quick web-search found there are several others who have experienced this. Despite having to replace the RTC chip, the module itself is still worth the price because it included a rechargeable Li-ion coin battery and a serial EEPROM (no time yet to see if that's working correctly...) -- David Forbes, Tucson AZ -- You received this message because you are subscribed to the Google Groups "neonixie-l" group. To unsubscribe from this group and stop receiving emails from it, send an email to neonixie-l+unsubscr...@googlegroups.com. To post to this group, send an email to neonixie-l@googlegroups.com. To view this discussion on the web, visit https://groups.google.com/d/msgid/neonixie-l/56B3F03C.6090903%40dakotacom.net. For more options, visit https://groups.google.com/d/optout.
[neonixie-l] Counterfeit RTC modules
Lesson learned: You get what you pay for. I bought a $2 US realtime clock module on Ebay, imported from China, and the DS3231 chip appears to be counterfeit because it was not keeping accurate time. I was suspicious about the price, considering I paid almost $8 US just for the DS3231 from a reputable supplier. Over a few days, it lost about 1 hour of time. After replacing the chip with a genuine Maxim DS3231, it's running correctly. A quick web-search found there are several others who have experienced this. Despite having to replace the RTC chip, the module itself is still worth the price because it included a rechargeable Li-ion coin battery and a serial EEPROM (no time yet to see if that's working correctly...) -- You received this message because you are subscribed to the Google Groups "neonixie-l" group. To unsubscribe from this group and stop receiving emails from it, send an email to neonixie-l+unsubscr...@googlegroups.com. To post to this group, send an email to neonixie-l@googlegroups.com. To view this discussion on the web, visit https://groups.google.com/d/msgid/neonixie-l/80b61558-a3f8-4938-b16a-30c9bdadd04c%40googlegroups.com. For more options, visit https://groups.google.com/d/optout.
Re: [neonixie-l] Counterfeit RTC modules
Another possibility is that these were scrapped/rejected units that escaped destruction at Maxim, and ended-up being sold, obviously illegally, and wound-up in products. It does seem odd to me that someone would go to the bother, not to mention the expense, of copying an inexpensive part and selling it. -- You wouldn't believe the hassles I had to go thru to get an 8-inch 'souvenir' wafer of a chip I worked-on that was never taken into production. -- You received this message because you are subscribed to the Google Groups "neonixie-l" group. To unsubscribe from this group and stop receiving emails from it, send an email to neonixie-l+unsubscr...@googlegroups.com. To post to this group, send an email to neonixie-l@googlegroups.com. To view this discussion on the web, visit https://groups.google.com/d/msgid/neonixie-l/71c0c466-530a-4c6b-8fbe-2eb634415cc2%40googlegroups.com. For more options, visit https://groups.google.com/d/optout.
