DS90C387 single and dual LVDS

Trenton Reed

Other Parts Discussed in Thread: TFP401, DS90C387

Can the TFP401 be used with the DS90C387 for both single LVDS and dual LVDS displays?

Looking at the datasheet I saw that the "DUAL" pin could be pulled high or low to configure the output. If the "DUAL" pin is pulled high then the input signals (single pixel) will be split into odd and even pixel and go to the respective A0-A7 pins. If the "DUAL" pin is pulled low then outputs A4-A7 and clk2 will be disabled and reduce power dissipation.

Will there be a loss of some of the colors since the even pixel outputs would be turned off? Or would it be single pixel in to single pixel out?

Thank you,

Trenton Reed

over 11 years ago

0 Michael Lu (Santa Clara) over 11 years ago

TI__Mastermind 29655 points

Hi Trenton,

The TFP401 + DS90C387 solution can be used in both single and dual pixel mode. You can configure the TFP401 in single-pixel display (1-pixel/clock mode) or dual-pixel mode (2-pixel/clock mode). Likewise, the DS90C387 can be configured for single-pixel mode or dual-pixel mode by setting the DUAL pin appropriately depending on whether the LVDS RX input after the DS90C387 expects dual or single.

The DUAL pin has three states. It can be high to VCC (dual-to-dual), 1/2 x VCC (single-to-dual), or low to GND (single-to-single). When you pull the DUAL pin low and disable LVDS outputs A4-A7, you are in single-pixel mode, where all information is sent via A0-A3. Therefore, you will not lose the even pixels, as they are not split into even and odd. Single pixel in, Single pixel out.

For some more helpful information about using a TFP401 + DS90C387, I recommend that you refer to another E2E post from the CCI Forum (see posts on Aug 03 2012 in the thread) that shows a community member who shared a working example with this combination:

http://e2e.ti.com/support/interface/digital_interface/f/130/p/39277/615666.aspx

Thanks,

Michael