MSP430FR6989: 3 LC sensor with 120° metal，how to set psm table

GONG SHEN

I have a problem with 3 LC sensor with 120° metal ，when the 120° metal rotates a round,the 3 LC states is 111,110,111,011,111,101,111. how to set psm table can determine rotate direction.

over 7 years ago

0 Yiding Luo over 7 years ago

TI__Expert 5490 points

Hello Shen,

Thanks for your post.
We will take look at your question and get back to you ASAP.

Thanks,
Yiding

0 GONG SHEN over 7 years ago in reply to Yiding Luo

Prodigy 30 points

No method?

0 Yiding Luo over 7 years ago in reply to GONG SHEN

TI__Expert 5490 points

Hello Gong,

Did you look at this document explaining how to set up the psm table?

LC Sensor Rotation Detection With MSP430™ Extended Scan Interface (ESI)
www.ti.com/.../slaa639.pdf

Thanks,
Yiding

0 GONG SHEN over 7 years ago in reply to Yiding Luo

Prodigy 30 points

Hello Yiding ，

I have saw this docment，but this is 120° ，I don't know how to do this.

0 Eddie LaCost over 7 years ago in reply to GONG SHEN

TI__Mastermind 46505 points

Hello Gong,

Sorry for the delay. Please have a look at the attached presentation which discusses the 3 sensor 120° implementation. Slide 10 provides some examples of signal readings at varying signal levels. As your implementation seems to have some duplicate states, I recommend using the state machine on slide 14 with 60° resolution.

Let me know if you have other questions on this.Esi3PhSM.pptx

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MSP430FR6989: 3 LC sensor with 120° metal，how to set psm table