SN65DSI86: PWM question when we using external REFIN_CLK

Ann_Lien

Part Number: SN65DSI86

Hello expert,

My customer is using SN65DSI86 for their MIPI to eDP application. They would like to know if they use external 27MHz to DSI86, does SN65DSI86 need to also provide PWM to panel for backlight driving? Or they can use external PWM output? Thanks a lot!!

Best regards,

Ann Lien

over 4 years ago

0 David (ASIC) Liu over 4 years ago

TI__Guru**** 176371 points

Ann

The SN65DSI86 can support controlling the brightness of eDP display via pulse width modulation. The PWM signal is output over GPIO4 when GPIO4 control register is configured for PWM. For the SN65DSI86, the brightness is controlled by the BACKLIGHT register. Please refer to section 8.3.3.3 Pulse Width Modulation (PWM) for more detail on PWM the implementation.

Thanks

David

0 Ann_Lien over 4 years ago in reply to David (ASIC) Liu

TI__Genius 14370 points

Hello David,

Thanks for your reply! Customer's question is do we have to use SN65DSI86 PWM to control backlight driving. Or could we use external PWM for backlight driving? Thanks a lot!

Best regards,

Ann Lien

0 Ann_Lien over 4 years ago in reply to Ann_Lien

TI__Genius 14370 points

Hello David,

Main chip in customer's design is rockchip and they want to use rockchip PWM for panel backlight driving. Thanks a lot!

Best regards,

Ann Lien

0 David (ASIC) Liu over 4 years ago in reply to Ann_Lien

TI__Guru**** 176371 points

Ann

I don't see an issue of using the Rockchip PWM to drive the panel backlighting.

Thanks

David

0 Ann_Lien over 4 years ago in reply to David (ASIC) Liu

TI__Genius 14370 points

Hello David,

Thanks for your great help :)

Best regards,

Ann Lien

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SN65DSI86: PWM question when we using external REFIN_CLK