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Drving a SPDT 2 coil latching relay
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Arjunan M R:
Hi, I am designing a PSU (18V 1A).To switch the ouput on and off I am going to use a latching relay.As i know nothing about latching relays can anyone help me to create a circuit so i can drive it from an MCU(ATmega328P).
Here is the relay I am going to use.
I can only find this circuit in the datasheet


Thanks in advance.
Arjunan M R:

Can anyone simply explain what this A1,A2 and A3 are and what is the small box with negative marking on it mean.
soldar:
My guess is that A3 is common and if you apply voltage to A1 it latches one way and if you apply voltage to A2 it latches the other way.
Arjunan M R:
Thanks for replying .I also thought so, but wasn't sure .
SiliconWizard:
Yes. According to page 1 of the datasheet, the coils are "polarized" as I get it.

So take care of polarity: look at the "Bistable coils - operation" table. A3 is indeed the common, but is the positive common.
The simplest way to control it would be to tie A3 to VDC and use two N-channel mosfets (drain to A1/A2, source to GND, gate controlled by your application). Also don't forget the freewheeling diodes.

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