M0181 Pin Out and Electrical Diagram
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Hi @joseph-vale
Great, thanks for clarifying.
Apologies our website is not always perfect. It is maintained by us Engineers, so we often take some info for granted. I am a few years delinquent in adding image sensor design guidance to our tech docs
All our MIPI_CSI lines are indeed 100-Ohm Differential, so the IPEX mate will match.
We include ESD protection on all MIPI CSI and I2C and GPIO/MCLK signals at the VOXL 2 J6, J7, and J8 connectors, so no need to double protect (or you can impact the bus signal quality with the added capacitance).When you get to the point of generating a schematic, I will offer a courtesy review. Ping me on this thread again and then I can email you privately to share if you wish.
One thing we did on our Coax design was plan on always using the same 26-pin cable, so it is our adapters that vary in pinouts, but our cable is always the fully populate 26 conductor DF56 series.
For Boson/Hadron, we use multiple conductors of 5V. We set that based on the DCR spec of our coax cable, so with your IPIEX cables, you can do something similar to achieve success.
We were also advised by Hirose to NOT use the outer shield as current carrying, so for every +DC path, we have a return GND conductor.Keep us posted!
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@Vinny hey man y'all have incredible support and responsiveness and honestly I'll take your docs over most anything I've dealt with on other projects. I'm an electrical / optical engineer myself so I feel that haha. I appreciate it and will follow up when ready!
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Thanks @joseph-vale for the kind words.
We will continue to try our best
Our success only comes with your success. -
Hello @Vinny , I am Fernando, and I am working on this project.
There was an error regarding the Impedance of the I-PEX cable. Each Micro-Coaxial has an impedance of 50 ohms, and for sure, the cable you are using is also 50 ohms.
My question is, how are you connecting each 100-ohm differential pair from the MIPI interface through each coaxial line?
Regards and thanks in advance
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Hi @Nando75
Yes, that is a fundamental limit of ALL uCoax that is not Twinax Impedance controlled conductors. Therefor all IPEX, Hirose, Molex, TE, etc (you name it) coax will fundamentally be limited in performance compared to true 100-ohm differential controlled impedance you can get from flex circuits or Samtec's Twinax. It is one of the many tradeoffs in our design space we need to make. As such, that is why we are firm on keeping the coax short and we do not sell any option longer than 180mm since at some point that small impedance offset and tolerances between two 50-ohm conductors compared to a true coupled 100-ohm may play a role.Hope this helps you.
Thanks! -
Thanks, @Vinny, for your help.
Just to confirm, you're suggesting that an IPEX cable assembly like this one (https://www.digikey.com/en/products/detail/i-pex/81457-100B-02-D/22108838?gclsrc=aw.ds&gad_source=1&gad_campaignid=203759898&gbraid=0AAAAADrbLljG_0DgosYmSjn-L6wfiInDx&gclid=CjwKCAjwxrLHBhA2EiwAu9EdMyI0xVm4X54JIAOikP3zqiHT_KgnCN1m9s6Gd_ba0VRVhewe2lowKxoCYHAQAvD_BwE), with a length of 200mm (slightly longer than your suggested 180mm), could work if each line of the differential pair is carried over a separate coaxial cable.
Regards,
Fernando
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Hi @Nando75
If it was less than 200mm, yes. 200mm is at your own risk, and make sure your SW team knows how to reach out and request slower MIPI CLK speeds in the event of signal integrity failures (camera failures).
Keep us posted.
Thanks! -
@Vinny , and what about using this kind of flex cable https://www.digikey.com/en/products/detail/jae-electronics/JF08R0R051040UA/9477713 ?
It is supposed that it has an impedance of 100 ohms between pairsThanks in advance,
Fernando -
Hi @Nando75
A shielded, impedance-controlled flex was our go-to solution in the early days, and we still offer a few legacy adapters that use it. These provide excellent signal integrity and EMI shielding. However, they’re limited in deployment flexibility; each flex must be meticulously designed for a specific routing path.Coax, on the other hand, greatly improves routing versatility and can be deployed across many platforms. The trade-off is reduced signal distance and slightly degraded signal integrity compared to a tuned flex.
Ultimately, it’s a system-level tradeoff. We’ve transitioned to coax as our mainstream solution in recent years, driven by customer demand for easier installation without the constraints of custom flex circuits.
Only your team can decide what's more important and hopefully we can enable you either way.
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We are moving forward with JAE Electronics flex cables.
Regarding the pinout for the Camera Connectors, I have a question about the MIPI Lanes. We intend to connect the IR and Visible MIPI lanes from the HADRON 640 to the VOXL2. Additionally, we will connect the I2C lines to control the camera.
My primary question is: Can I utilize only one camera group, or will two camera groups be necessary? If a single camera group is feasible, I plan to use one 51-pin Flexible Cable (https://www.digikey.com/en/products/detail/jae-electronics/JF08R0R051040UA/9477713) to connect our breakout board to an adapter PCB for the Hirose connector.
This information is crucial for us to begin the schematic design.
Regards,
Fernando
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Hi @Nando75
For the Boson portion of the Hadron, you need a 2L MIPI CSI config and for the EO portion you need a full 4-L MIPI CSI port, so you will be consuming an entire "Camera Group" from VOXL 2 for this.
You will want to assign the "lower" group to the Boson Portion in 2L mode and the full 4L "upper" group to the EO portion such that our SW matches up easily. Here are some mapping tables we constructed early on for this you can use as a guide (color based mapping, so hopefully that comes through OK).
However, please double check this and also let us know when you are ready for a SCH review. Tag me again on the Forum when you are ready, then I can email you at the address used for your Forum registration so you can share your SCH with me for a review.
Hope this helped!
Thanks!
