Timeline for Unknown SOT-23-5 I2C device
Current License: CC BY-SA 3.0
23 events
| when toggle format | what | by | license | comment | |
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| Jan 16, 2018 at 4:34 | history | bumped | CommunityBot | This question has answers that may be good or bad; the system has marked it active so that they can be reviewed. | |
| Dec 16, 2017 at 23:52 | history | bumped | CommunityBot | This question has answers that may be good or bad; the system has marked it active so that they can be reviewed. | |
| Nov 14, 2017 at 11:25 | history | bumped | CommunityBot | This question has answers that may be good or bad; the system has marked it active so that they can be reviewed. | |
| Oct 7, 2017 at 14:06 | history | bumped | CommunityBot | This question has answers that may be good or bad; the system has marked it active so that they can be reviewed. | |
| Aug 24, 2017 at 9:49 | comment | added | DiBosco | There are companies in the east of England that specialise in reverse engineering these systems so they can make refillable cartridges. It really ****** off the printer manufacturers as they make a lot of money from fleecing customers with overpriced non-refillable cartridges. The printer manufacturers are regularly changing the protocols, so that once it's been cracked they bring out a different version, All very green. Not. | |
| Aug 24, 2017 at 9:39 | answer | added | Cristian Mardones | timeline score: 2 | |
| S May 6, 2017 at 23:29 | history | suggested | vrleboss |
added identification tag
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| May 6, 2017 at 22:57 | review | Suggested edits | |||
| S May 6, 2017 at 23:29 | |||||
| Aug 15, 2016 at 19:43 | history | tweeted | twitter.com/StackElectronix/status/765272753482137601 | ||
| Aug 15, 2016 at 11:55 | history | protected | Dave Tweed | ||
| Sep 27, 2015 at 12:45 | comment | added | ZeitGeist | Chris Stratton: right now I see these possibilities: 1. manage somehow to modify (increase) the counter data. 2. somehow save the memory of one full chip and copy it to the empty one. 3. put a microcontroller inbetween and emulate. | |
| Sep 27, 2015 at 12:44 | comment | added | ZeitGeist | Passerby: right, I've doublechecked and it's like this, so the traces are as I desribed. The chip has an internal counter inside and during usage this counter is being decreased. Once the counter is zero, the printer does not accept it, even if physically there is ink in the cartridge. The physical level of the ink in the cartridge and the counter is not matched up, so it can happen that there is a physically full cartridge but the chip is "empty". In this case the cartridge is unusable. | |
| Sep 27, 2015 at 4:28 | comment | added | Chris Stratton | What are you trying to accomplish? Could you replace the circuit with a microcontroller programmed to emulate it and provide customized data? | |
| Sep 27, 2015 at 1:50 | comment | added | Passerby | If the rightmost trace is power, then sda is being tied to ground with r1? | |
| Sep 27, 2015 at 1:23 | history | edited | Tom Carpenter | CC BY-SA 3.0 |
Added picture from the comments.
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| Sep 27, 2015 at 1:22 | comment | added | Tom Carpenter | It's not going to be an off-the-shelf EEPROM chip. There are many SOT23-5 package EEPROMs, but they all use a pretty standard pin arrangement. Based on that photo it is clear that the chips have a completely different (and incompatible) pin assignment. To be honest if is something in a printer cartridge you are not going to be able to find any information on what the data is - without information from the cartridge manufacturer about what format the data is in, it is basically a meaningless string of bits. | |
| Sep 26, 2015 at 23:32 | comment | added | ZeitGeist | If we assume that its not a custom ASIC, what else could be if it stores data? I saw one the PCA24S08A, which is an EEPROM with access protection, but its not in an SOT-23-5 package. Is there a similar product in SOT-23-5? | |
| Sep 26, 2015 at 20:11 | comment | added | Grabul | If it is high volume production, it could be custom ASICs, with no public datasheet. | |
| Sep 26, 2015 at 19:42 | comment | added | ZeitGeist | Here is the picture from the board: goo.gl/photos/MfSMzKJgRNm4tg7s5 It's a refilling protection board of an ink cartridge. | |
| Sep 26, 2015 at 19:34 | comment | added | Grabul | Could it be a sensor ? Temperature, angle, magnetic field ... | |
| Sep 26, 2015 at 18:45 | comment | added | Tom Carpenter | What's the board from? Any pictures? | |
| Sep 26, 2015 at 18:15 | review | First posts | |||
| Sep 26, 2015 at 18:58 | |||||
| Sep 26, 2015 at 18:12 | history | asked | ZeitGeist | CC BY-SA 3.0 |