THVD1450: internal resistor value of receiver

Ryo Akashi

Genius 9470 points

Part Number: THVD1450

Hello,

I have a question about receiver's internal resistor value.

This training video (https://training.ti.com/rs-485-overview

over 6 years ago

0 Ryo Akashi over 6 years ago

TI__Genius 9470 points

Sorry, the question is not posted completely.

RS-485 overview training video says that every RS-485's receiver has internal resistor for bias function and attenuation.

In THVD1450 case, how much is the resistor value of internal resistor?

Could you tell me how to calculate?

Thanks and best regards,

Ryo Akashi

0 Hao L over 6 years ago in reply to Ryo Akashi

TI__Mastermind 25705 points

Ryo,

You can roughly use R1=240kOhm, R2=23kOhm, R3=15kOhm as the equivalent resistance. These values come from the IC design. Please let me know if you have more questions.

Regards,
Hao

0 Ryo Akashi over 6 years ago in reply to Hao L

TI__Genius 9470 points

Hello Hao,

I understand.

Thank you very much for your kind support.

Best regards,

Ryo Akashi

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THVD1450: internal resistor value of receiver