To Pull up or to pull down? Different un-used pins need attention!

Thread Starter

MaxWilko

Joined Jun 21, 2021
9
Hi all,

I'm fairly new to PCB design and am designing out a out of stock part which isn't available til 2024!
The previous component was INA219AIDCNR and this is out of stock for a long time so PAC1932T-I/JQ seems to be the component for the job as a IC CURRENT MONITOR, except it has more inputs to sense and I only need to sense one.

What would be the best way to ensure I am not getting any unwanted noise, I have a few unused pins as your can see in the schematic. Currently I have connected all un-used pins to ground, but I am very unsure this is the correct method to go by.

Anyone who knows and has the time to help me, it would be greatly appreciated.

Max
 

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schmitt trigger

Joined Jul 12, 2010
472
We have also been experiencing similar ultra long lead times on certain components.
Who hasn’t?

What I have found is in many instances you might find the same component but in different packages. What we have being doing is adapter boards.
Just a thought.
 

Thread Starter

MaxWilko

Joined Jun 21, 2021
9
Thank you everyone for your help, the concept is clearer in my mind now! I have attached another photo of the developed schematic, I've left "EP" unconnected as this is not electrically connected internally (according to spec sheet) and I haven't connected the "SLOW/ALERT" pin. I can't see why I would need this. In the spec sheet it says you need to pull up to set ALERT, this is a I/O pin so I'm not sure what to with it yet.

I will carry on researching in the mean time, thanks again!
 

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