Timeline for How do you align parallel connectors (e.g. Raspberry Pi CM4) in production?
Current License: CC BY-SA 4.0
11 events
| when toggle format | what | by | license | comment | |
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| Dec 13, 2023 at 9:20 | comment | added | Vladimir Cravero | @JackB that's a great insight to hear. I guess I won't be using hirose any time soon then... That's not a great move. | |
| Dec 12, 2023 at 18:07 | comment | added | Mast | "they asked us to put several fiducials in the connectors area" In my (outdated) experience, having 3 fiducials and having them not too close together is fairly standard. | |
| Dec 12, 2023 at 18:06 | comment | added | Jack B | @VladimirCravero The Rpi version of the story is that they didn't disregard/overlook it per se, Hirose changed the datasheet to recommend against doing this after Rpi finalised the CM4 design. Source | |
| S Dec 12, 2023 at 14:40 | history | suggested | JensV | CC BY-SA 4.0 |
Use delimited link (see https://meta.stackexchange.com/a/13509/752553 )
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| Dec 12, 2023 at 13:08 | review | Suggested edits | |||
| S Dec 12, 2023 at 14:40 | |||||
| Dec 12, 2023 at 12:47 | comment | added | Vladimir Cravero | The manufacturer specifically discourages the usage of these connectors in the configuration that they have decided to use, so at the very least they disregarded or overlooked this. There are connectors that allow for some misalignment (search floating connectors), but those are progressively more expensive. From a company that decided to keep the sdcard as the primary boot option for their latest product, I tend to think they chose the path of the money for the connectors as well - but this is just speculation, the datasheet is not. You can decide to ignore it, or take the risk. | |
| Dec 12, 2023 at 11:15 | comment | added | John U | I doubt the Pi foundation decided to mass-produce these based on "Meh, close enough, send it!", they may not be splitting the atom but they're not bad at engineering these things. | |
| Dec 11, 2023 at 20:53 | comment | added | Vladimir Cravero | Of course it is manufacturable @JohnU, the problem is that the connector mfg is not taking responsibility for this. Unless you find an assy house that can give you ±0 tolerance, you will need to take responsibility for this. You seem to think that the Rpi Foundation is aligning them somehow, but they are not. They are lucky enough that it just works, and they decided to take this risk - or maybe they are unaware such a risk exists. Since you asked yourself this question, you probably do not want to take this risk, for one reason or the other, and therefore should drop the Rpi CM4. | |
| Dec 11, 2023 at 17:30 | comment | added | John U | You've got a better eye than me, I did not spot that in the documentation! +/-0 is a fantasy tolerance though, if that were true no-one would be able to make any boards using these and clearly (with many many thousands sold) the CM4 using these must be manufacturable. | |
| Dec 11, 2023 at 17:23 | history | edited | Vladimir Cravero | CC BY-SA 4.0 |
added 647 characters in body
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| Dec 11, 2023 at 17:15 | history | answered | Vladimir Cravero | CC BY-SA 4.0 |