DS90CP04: How to daisy chain?

Lauren Mayfield

Part Number: DS90CP04

Tool/software:

Hi team,

My customer had a request.

I need to use this switch as an LVDS repeater, but I have 4 of this part to handle 12 LVDS repeaters (I do need 2.5V VDD) and

here, I read that we can daisy chain for program/configuration via clock and SI/Lel1

The issue is that there no samples how to daisy chain and the website doesn’t have any application besides the attach PDF

So I am not sure how to daisy chain the RS0/CSO, RSCLK/CSLK to save pins I/O since I have 4 parts to make 12 LVDS

Can you provide guidance on what pins need to be connected where to properly daisy chain?

Thanks,
Lauren

9 months ago

+1 David (ASIC) Liu 9 months ago

TI__Guru**** 176811 points

Lauren

Please see this e2e thread, https://e2e.ti.com/support/interface-group/interface/f/interface-forum/1176349/ds90cp04-about-serial-interface-design, does this help answering their question?

Thanks

David

0 David (ASIC) Liu 9 months ago in reply to David (ASIC) Liu

TI__Guru**** 176811 points

Lauren

Please see below for the block diagram and let me know if you have any questions.

The serial interface is designed for easy expansion to larger switch array. A replicated output serial interface (RSCLK, RSO) is provided for propagating the control data to the downstream device in the row of an array of DS90CP04 devices in a matrix. A similar replicated serial interface (CSCLK, CSO) is provided for propagating the control data to the downstream devices in the first column of the device matrix.

Thanks

David

0 David (ASIC) Liu 8 months ago in reply to David (ASIC) Liu

TI__Guru**** 176811 points

Lauren

Please see the description below,

So RSO output pin will be connected to the SI input pin of the next device in the row, and RSCLK will be connected to the SCLK input pin of the next device in the row.

Similarly, CSO output pin will be connected to the SI input pin of the next device in the column, and RSCLK will be connected to the SCLK input pin of the next device in the column.

Thanks

David

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DS90CP04: How to daisy chain?