TMCS1100: TMCS1100

Hey Denys,

Thanks for considering to use Texas Instruments.  If you do not supply a reference voltage to the REF pin, then it should be floating and it could be any potential between device supply and ground and will likely decay in value toward ground when you connect a probe.  If the potential stays at 1.6V, I suspect you have a short to some supply rail.  What does the device output show?

Hi Patrick,

Thank you for your answer. I will try to describe the situation in more detail. 

All circuit you could see here https://docs.google.com/document/d/1ACjb6E462cW_q6zNRVez3B38pbgIniZjh2cjsecNH7A/edit?usp=sharing

I hope It will be work.

In a couple of words--yes, then it should be floating and it could be any potential between device supply and ground and will likely decay in value toward the ground when you connect a probe. -this part works, I checked on the bare board just with the Hall sensor and power supply.

Strange behaviour I see when we connect external 2.5 V REFERENCE, on Vref 2.5+(1.6...1.8). Total is 4.2V.

@I suspect you have a short to some supply rail-hm, I don't see magic smoke.

But anyway thank you for your help

Hello Patrick

Looks like I have issues with references. I little bit warmed  pins and now system behavior is more predictable.

Thank you very much for your time