Exploring the plasmacluster protection circuitry
Added 2024-03-19 23:46:34 +0000 UTCThe dense potting resin used in this module made it VERY hard to explore. I pretty much destroyed it in the process, which is a shame as I'd like to have extracted the data from its protection chip.
Perhaps that can be done in the future now I know the pinout of the connector and the nature of the internal usage counter.
Comments
Noe that you know the pinouts, you can sniff the I2C (of the next near-dead HV module) with your low-cost decodes-everything Chinese scope and see what's being discussed. - it would be remiss of Sharp not to have incorporated some sort of checksum on the EEPROM and show they're not trying to rip us off hard enough if they didn't do that. Mike (with the electric stuff) has an high-definition industrial X-ray machine, I'm sure he'd image the inside of potted stuff if you asked him.
Gordo
2024-04-07 17:41:25 +0000 UTCAssuming it is a standard 24Cxx device, you could take a snapshot of it when newish and restore the "fresh" data whenever the LED starts flashing. That's assuming there's no additional nonvolatile data in the PIC used for tracking or checksumming or whatever. There has to be a facility to accept replacement modules.
Mike Page
2024-03-22 18:53:42 +0000 UTCI may rough one in at some point to see what happens.
Big Clive
2024-03-21 22:32:55 +0000 UTCI bet that if you connect empty i2c eeprom it will start to work, i have 1500e medical device which do init with empty eeprom and start counting again,
Tomáš Kováčik
2024-03-21 20:56:57 +0000 UTC
