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I would like to build a latching relay control circuit, controlled by MCU. I'd like to implement the following: enter image description here The idea is from here: https://pdfserv.maximintegrated.com/en/an/AN3288.pdf The relay I would use is omron G6CU-2117P-US DC3 Datasheet: https://www.farnell.com/datasheets/2976880.pdf The latching relay's critical point is to return to steady state after it was switched. For the control I would use max4820 relay control circuit, however for the return to zero current I would use hardware which resets the max4820 ic, once the switch is done. I thought the following curcuit: enter image description here Pulse would came to this circuit, when CS goes high on max4820 First schmitt would be a pulse detector for 1us, the second would function as a holder (monostable multivibrator). Making C2 and R2 high enough (with T about 30-50 ms) would serve as a power on reset circuit as well, and the final output pulse detector would be the output which would send the -RESET (about 1us) to the max4820.

Dou you thing this would do the job? If not could you please suggest a better solution? Thank you.

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  • \$\begingroup\$ What latching relay are you considering (data sheet link please)? What do you mean by: The latching relay's critical point is to return to steady state after it was switched? I think you need to show the rest of the schematic involving the MAX4820 and, you need to link the MAX4820 device data sheet into your question. Why can't your MCU GPIO replace the circuit you have shown? \$\endgroup\$
    – Andy aka
    Mar 17 at 10:38
  • \$\begingroup\$ A very warm welcome to the site. It's slightly unclear what the operations are, please can you edit your question and make the descriptions of each step of operation more distinct and separate. From a first glance though, have you looked at doing this with a 555 timer? \$\endgroup\$
    – TonyM
    Mar 17 at 10:39
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    \$\begingroup\$ If you have a MCU then why do you need external timers? Is the MCU clock too inaccurate or what? \$\endgroup\$
    – Lundin
    Mar 17 at 10:41
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    \$\begingroup\$ Thank you for the answers. Nope, MCU is accurate enough, but the software could go wrong sometimes, or just simple freeze. That's why I would not trust the mcu for controlling this. If the lathing relays would have current for long enough time, it would burn. I'd like to avoid this. \$\endgroup\$
    – sandor lio
    Mar 17 at 10:43
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    \$\begingroup\$ The relays you have linked are not "latching relays"; they are just conventional relays as far as I can tell. I think the confusion here comes from you using the term "latching relays". Where does the reset pulse come from? \$\endgroup\$
    – Andy aka
    Mar 17 at 11:25

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