DS90UB949-Q1: DS90UB949-Q1 hardware design support

mahesh devadiga

Part Number: DS90UB949-Q1
Other Parts Discussed in Thread: LSF0204-Q1

We are using DS90UB949-Q1 (1080p HDMI to FPD-Link III Bridge Serializer) in my application.

I have some hardware design queries.

We are going to connect other HDMI signals from SDA845(Qualcomm processor and 1.8 Voltage level signals ) processor to DS90UB949-Q1 Serializer

Signals - DDC_SDA - pin no - 44

DDC_SCL -pin no - 45

CEC - pin no - 1

HPD - pin no - 42

Queries 1. Shall i connect DDC_SDA , DDC_SCL and HPD pins ( voltage level 1.8) from processo, directly to DS90UB949-Q1 Serializer.? In the serializer datasheet page number 4 , mentioned that, these pins need to be pull up with RX_5V out. Whether i need to place any HDMI 5V level transceiver and that level transceiver output of those signals i need to connect to the the Serializer? What is the correct way i need to do?

Queries 2. For CEC signal (1.8 voltage level from processor) shall i connect directly to serializer and tie wit 3.3 voltage (Serializer data sheet page no 4) or need to place any 1.8 voltage to 3.3 level translator? or HDMI 5V transceiver sufficient?

Best Regards,

Mahesh

over 6 years ago

0 mahesh devadiga over 6 years ago

Prodigy 80 points

If transceiver is required for processor to DS90UB949-Q1, can you suggest HDMI Transceiver part number?

0 Aaron Heng over 6 years ago

TI__Mastermind 41820 points

Hi Mahesh,

Thank you so much for reaching out to us. The HMDI is the standard protocol. Please make sure that you need to confirm with the QCOM processor team these pins are pulling to 5V as well as CEC to 3.3V. If these pins pulled to 1.8V logic high; unfortunately, we can't direct connect to the serializer. You need the level shifter. I need to look into the level shifter and get back to you sometimes tomorrow.

Aaron

0 mahesh devadiga over 6 years ago in reply to Aaron Heng

Prodigy 80 points

Thanks for the info..Could you please suggest HDMI LEVEL SHIFTER?

0 Aaron Heng over 6 years ago in reply to mahesh devadiga

TI__Mastermind 41820 points

Hi Mahesh,

I found the level shifter that you can configure with different voltage levels having 3 lines for 5V and 1 line for 3.3V, and it is automotive qual LSF0204-Q1; otherwise, you might need to two separate level shifter for 5V and 3.3V. Please verify this level shifter if it is fit your application.

I would recommend that you should review the video below that it might help you answer any questions you might have how to use configure this device.

https://training.ti.com/multi-voltage-translation-lsf-family?context=1134826-1139264-1134795

Hope this helps. Let me know if you have further questions.

Aaron

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DS90UB949-Q1: DS90UB949-Q1 hardware design support