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On Semi: EMI2121 USB Filter Pinout
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Topic: On Semi: EMI2121 USB Filter Pinout (Read 1650 times)
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Pack34
Frequent Contributor
Posts: 753
On Semi: EMI2121 USB Filter Pinout
«
on:
October 18, 2016, 08:19:48 pm »
Does anyone here have experience with the On Semi EMI2121 EMI/ESD chip?
http://www.onsemi.com/pub_link/Collateral/EMI2121MT-D.PDF
I'm attempting to keep my USB circuit as compact as possible and I noticed that the positive and negative pins on the input of the chip do not line up with the actual data lines on a USB connector. IN_1+ and IN_1- should be switched.
USB Connector pinout:
https://en.wikipedia.org/wiki/USB#Pinouts
If the simplified schematic can be believed then having USB_DM connected to IN_1+ and USB_DP connected to IN_1- shouldn't matter. I just wanted to get some
«
Last Edit: October 18, 2016, 08:32:53 pm by Pack34
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exmadscientist
Frequent Contributor
Posts: 342
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Technically A Professional
Re: On Semi: EMI2121 USB Filter Pinout
«
Reply #1 on:
October 19, 2016, 03:14:59 am »
I haven't used that particular part, but a similar ST part (ECMF02-4CMX8) has the same pinout issue and swapping the pairs works just fine.
Just be sure to swap them an even number of times!
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technix
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Posts: 3507
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From Shanghai With Love
Re: On Semi: EMI2121 USB Filter Pinout
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Reply #2 on:
October 20, 2016, 04:28:33 am »
As far as I see the two channels are completely symmetric and can be interchanged freely.
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Pack34
Frequent Contributor
Posts: 753
Re: On Semi: EMI2121 USB Filter Pinout
«
Reply #3 on:
November 22, 2016, 02:46:12 pm »
I never mentioned the resolution for this. Swapping the pins worked out fine. I was concerned since the channels were specifically labeled as Data_Plus and Data_Minus but it didn't matter.
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