About EMcCa.1

EMcCa.1 · 2020-05-11

EMcCa.1 · 2020-05-10

EMcCa.1 · 2020-05-12

Thanks for the info. We haven't made PCB's yet so design revision of board & software can be done w/o big trouble. But we wonder why the app note illustrates how to use external 3.3V VDD if there could be such trouble. Systems with multiple power su...

EMcCa.1 · 2020-05-11

Thanks for the reply. By VSS I meant VSA & VSB (H bridge power, not GND, which is always connected between all L6470s). On our system H bridge power is temporarily removed by safety interlock but that will stop all the internal 3.3VDC regulators. So ...

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ST Micro app note AN4241 shows ways of connecting logic power on L6470's to external 3.3V & 5V supplies. For external 3.3V it shows VREG & VDD are connected. Is this correct? It seems like the internal L6470 3.3V would content with the external.

Can we remove VSS power from 8 daisy chained L6470s but keep them powered by 1 external 3.3VDC supply via the VDD pins (ref. section 1-3 of ST Micro note AN4241) w/o damaging the parts? Will the L6470's retain their parameters w/o VSS but with VDD on?

Re: Can we remove VSS power from 8 daisy chained L6470s but keep them powered by 1 external 3.3VDC supply via the VDD pins (ref. section 1-3 of ST Micro note AN4241) w/o damaging the parts? Will the L6470's retain their parameters w/o VSS but with VDD on?

Re: Can we remove VSS power from 8 daisy chained L6470s but keep them powered by 1 external 3.3VDC supply via the VDD pins (ref. section 1-3 of ST Micro note AN4241) w/o damaging the parts? Will the L6470's retain their parameters w/o VSS but with VDD on?