DLPC230-Q1: RPI resistor

Zehui Li

Part Number: DLPC230-Q1

Hi,

In table 9-4 of the datasheet, Resistor - Bandgap Reference has a minimum value 42.2 (1%). Is it the only value I can use? Can I choose a larger one?

over 1 year ago

0 Tristan Bottone over 1 year ago

TI__Intellectual 1750 points

Hello Zehui,

Thank you for reaching out and using the E2E forums! An expert from our team will review the thread and get back to you shortly.

0 Ross S. over 1 year ago

TI__Expert 4090 points

Hello Zehui -

Yes, you should be able to choose a larger value. 42.2 kOhm was selected for a 6" LVDS cable, so increasing the value would reduce the margin. What size resistor are you planning to use? We would recommend 43 kOhm or similar.

Regards,

Ross

0 Zehui Li over 1 year ago in reply to Ross S.

Intellectual 540 points

Hi Ross,

Do you mean the larger the resistor is the short the LVDS length could be? How does the resistor work? Does the resistor change the bandgap voltage? 1% accuracy of resistor is necessary?

0 Ross S. over 1 year ago in reply to Zehui Li

TI__Expert 4090 points

Hello Zehui -

The drive strength of this DMD sub-LVDS interface is inversely proportional to this resistor. So 42.2 kOhms would provide the max available drive strength. Increasing the resistor value means the trace length likely needs to decrease.

Regards,

Ross

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DLPC230-Q1: RPI resistor