Re: neat Hall sensor

On Wed, 01 Jan 2025 08:11:06 GMT, Jan Panteltje <alien@comet.invalid>
wrote:

On a sunny day (Tue, 31 Dec 2024 15:58:07 -0800) it happened john larkin
<jl@glen--canyon.com> wrote in <nm09njhfcjh49jbof7qm3fl8pv321j34sk@4ax.com>:
>

>
https://www.monolithicpower.com/en/mcs1802.html?srsltid=AfmBOoq2BNuYQ-Ef5ee9o7-gyHDqRkK_xS5TAKb-MgxtjZ6r71FItxXm
>
Really nice, as compared to a shunt and an isolated ADC and all that
stuff. Reasonably accurate, especially above 20c.
>
But they can't be serious about pushing 50 amps through an SO8
package. Or not for long.
>
Their demo board thermal design is kinda silly.

>
I use some of these:
https://www.lem.com/en/product-list/hx-10p
>
Maybe they have 50 amp versions too?

We have a LEM HMSR6-SMS instock... not sure why. There is a 30 amp
version. It's more accurate than the Monolithic part and has nice
chunky current leads, but it costs over 2x as much as the Mono part.

https://www.digikey.com/en/products/detail/lem-usa-inc/HMSR-6-SMS/12686318?s=N4IgTCBcDaIBIFkDKAlAbAWickBdAvkA

We can auto-zero the Monolithic part at powerup, which will help the
accuracy a bit.

I'm designing a plugin to our modular power system, just a board with
eight power relays. Then we figured, let's measure the voltage and
current of each relay too. Featuritus follows. Why not make it a
programmable circuit breaker? Why not a polyphase wattmeter? Somebody
please stop me.