At 14:07 2017-12-18, Sean Breheny wrote: >Hi Mario, > >When you say that the relays are low-side, do you mean that one end of the >coil is grounded? Hi Sean, with driving them low-side I mean that the +12V to one end of the coil is fixed, to activate the relay I can only ground (and sink current) from the other wire, which I have access to. >If the relay coils can be connected between power and the switching device= , >then the usual solution is the ULQ/ULN series of darlington arrays: > >http://www.ti.com/lit/ds/symlink/ulq2003a.pdf Yes I knew the 200X but for some reasons I was convinced that it sourced current, not that it sinked it.=20 >There may be a PNP version of this which would work with coils which have >one end grounded but I am not sure and don't have time right now to search >for it. Thank you anyway, I knew the 200X but I was convinced that it did the oppos= ite, i.e. that it sourced current, not sinked it. I even have some in a drawer, = and I never used them. Anyhow, even if that info didn't help me (and it did), there are many other people that read and any bit of information that is shared or even just reminded here is always useful. Thanks. Cheers, Mario > >Sean > > >On Mon, Dec 18, 2017 at 7:37 AM, Mario wrote: > >> >> Hello, >> I have to drive 4 relays, the 12V coils absorb about 200mA but I would >> like to be able to supply some more juice in case I changed relays later= .. >> >> Is there a nice, ubiquitous, IC that I don't know yet, that will do the >> job and, even better, has 3.3V inputs (preferably direct, parallel, but = I >> would consider also e.g. I2S) to command the relays, and integrated >> flyback protection diodes? The relays are all low-side and I can't chang= e >> or rewire that. >> >> An 8 output IC or versions that can sink directly even 3-5A would be >> interesting to know too. >> >> Thanks for sharing your knowledge. >> >> Cheers, >> Mario >> >> -- >> http://www.piclist.com/techref/piclist PIC/SX FAQ & list archive >> View/change your membership options at >> http://mailman.mit.edu/mailman/listinfo/piclist >> >--=20 >http://www.piclist.com/techref/piclist PIC/SX FAQ & list archive >View/change your membership options at >http://mailman.mit.edu/mailman/listinfo/piclist --=20 http://www.piclist.com/techref/piclist PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist .