Can I connect the Teensy 4.1 directly to SwitchBlox?

BotBlox Hardware
1

– Copied from customer query –

I am working with a Teensy 4.1 they have an ethernet kit which has the LPJ4012AHNL which has magnetics on it. i would like to use your SwitchBlox NDAA compliant board with this unit, but I would like to know if i can go direct to the teensy 4.1 WITHOUT going to the ethernet kit (LPJ4012AHNL) which would avoid the size and also avoid the built in magnetics in the jack. the idea is to minimize the foot print of the product by removing the need for an ethernet jack.**|

2

Yes, you can most likely connect the Teensy 4.1 directly to SwitchBlox NDAA. Here’s how I deduced that.

  1. The Teensy 4.1 uses a DP83825I ethernet PHY. This is a voltage line driver, meaning that it doesn’t require a transfromer to work like a current mode transformer does. It drives the ethernet signal as a direct voltage signal which can be transmitted without having to “push-pull” current through a transformer.

  2. There are transformers on SwitchBlox NDAA anyway, so there would be at least one transformer in the system that a current mode PHY could use to “push-pull” current, even if the Teensy was using a current mode PHY (which it’s not)

Of course, I can’t know this for sure, but I’d say this has a high likelihood of working.