Hi The “normal chips” that should be inside the module all have something like a 3.6V max supply rating on them. I would guess that 5V will melt a goodly number of them.
Bob > On Jan 9, 2021, at 5:38 PM, Nigel gm8pzr via time-nuts > <[email protected]> wrote: > > During the December conversation re LEA-M8T modules on scraps of PCB from > Ebay I commented that the same seller also had complete circuit boards > available, and suggested this might be a worthwhile alternative. > > I've dealt with this seller before, always been very happy with the results, > and agreed a price on three such modules which arrived just before Christmas, > for reference this particular Ebay ID was 333619130232, and finally found > time to start checking them today. > The modules themselves look very nice, but one of the auction photos is a > connection diagram that shows Pin 2 of the 8 pin interface connector as > "Power In 5V DC", and on this PCB that pin connects directly to the pin 6 Vcc > input on the Ublox module, which has an absolute maximum rating of 3.6V > .......whoops! > This is not intended in any way to be a criticism of this seller, who I am > more than happy to recommend, nor indeed of any other seller, but this is a > generic diagram that several sellers are using for various Huawei/Ublox > modules, some of which may have an onboard 3.3V regulator, as presumably did > the one this diagram originally referenced, but some of which may not. > > So that's the warning folks, don't trust that diagram without checking! > Now a question, supposing someone did follow that diagram and applied 5 Volts > to Vcc on the M8T, what is the risk of damage and would it be immediately > obvious? > And no, I didn't:-), but when modules are described as tested concern might > arise as to the test conditions. > Nigel GM8PZR > _______________________________________________ > time-nuts mailing list -- [email protected] > To unsubscribe, go to > http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com > and follow the instructions there. _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com and follow the instructions there.
