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RPL1116 (MSO1000Z) and PLA2216 (MSO5000) Active Logic Probe teardown

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John_Cavanaugh:
Any thought on using mini displayport for cables?   They have orientation and same lanes as hdmi.

Cables are pretty cheap.   https://smile.amazon.com/Cable-Matters-Mini-DisplayPort-Black/dp/B0777RKTJB/ref=sr_1_8

But I didnt check on the connector prices.    I suspect the usb-c are much cheaper...

thmjpr:
Added code for stm32 here: https://gitlab.com/thmjpr/stm32f03_la_monitor
Will show cable status ("A: -" means A cable not connected, etc.) and the two threshold voltages (0 to +15V).

I have one partial built usbc main board and un-built PCBs if anyone is interested. 3D printing is possible but would cost more for shipping.

BTW there is a SCPI command for LA time offset, :LA:TCALibrate 0.0000002 +/- 200ns but its not working (read back is always 0), suspect in another thread that its not actually been implemented yet.


--- Quote from: John_Cavanaugh on June 20, 2019, 04:50:50 am ---Any thought on using mini displayport for cables?   They have orientation and same lanes as hdmi.
Cables are pretty cheap.   https://smile.amazon.com/Cable-Matters-Mini-DisplayPort-Black/dp/B0777RKTJB/ref=sr_1_8
But I didnt check on the connector prices.    I suspect the usb-c are much cheaper...

--- End quote ---

That would be a good choice. Its also possible to mix it up with mini->normal size cables as those are more common, but $9 is great already and seems robust. Connectors, I see two on digikey for $2-3 each:

https://www.digikey.ca/product-detail/en/te-connectivity-amp-connectors/2129320-3/A120537CT-ND/5021748
https://www.digikey.ca/product-detail/en/pulse-electronics-network/E9320-001-01/553-3756-1-ND/4169580

jMachina:
Wow, I am so glad that I just made this account! Would you be willing to share design files and firmware so I can make a run of PCBs?

Thank you kindly,
jMachina

thmjpr:

--- Quote from: jMachina on August 08, 2019, 10:45:53 pm ---Wow, I am so glad that I just made this account! Would you be willing to share design files and firmware so I can make a run of PCBs?

Thank you kindly,
jMachina

--- End quote ---

Thats great. I've added files for revision 1 board here: https://gitlab.com/thmjpr/stm32f03_la_monitor/tree/master/PCB_Rev1

As mentioned in PM, I would recommend going with that and modding the pod PCBs, or getting me to do it. That way you'd have 14 usable channels out of 16, then two inverted. Shipping the extra boards is not expensive. But if you want to wait for Rev2 files that is OK.

thmjpr:
Revision 2 PCB is here: https://gitlab.com/thmjpr/stm32f03_la_monitor/tree/master/PCB_Rev2

- See readme.md
- A 50 pin connector available from LCSC but has no polarized part in the middle, so could accidentally be plugged in upside down. One polarized version is: SFH11-PBPC-D25-ST-BK (digikey)
- CC1/2 resistor values might need to be played with or voltage measured, can't recall if I used what was on the schematic.

Attached some parts I bought from LCSC but its not the complete BOM, just use for sourcing ideas.

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