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| mithro | rohitksingh: ping? | 07:38 |
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| mithro | rohitksingh_work: ping? | 07:40 |
| rohitksingh_work | mithro: pong! actually i've my personal laptop also right now, that's why both nicks :p | 07:41 |
| rohitksingh_work | just saw your mail! its very helpful! | 07:41 |
| mithro | rohitksingh_work: I just replied to your DisplayPort email | 07:41 |
| mithro | rohitksingh_work: Do you have a production Numato Opsis board with you and some time to do some debugging on it? | 07:42 |
| rohitksingh_work | mithro: yeah. I do have a opsis production board, but it has non-working ethernet, which shouldn't be problem for Displayport though | 07:43 |
| mithro | rohitksingh_work: Can you load the HDMI2USB firmware onto it and then probe the power supply voltages | 07:44 |
| mithro | tumbleweed was looking at the 3V3 voltage rail on his boards and it is much closer to a 3V0 voltage rail | 07:44 |
| rohitksingh_work | mithro: yeah sure! you just want to measure voltage through mutimeter or want to know of ripples etc on a scope. | 07:44 |
| rohitksingh_work | got it. I'll measure it | 07:45 |
| mithro | rohitksingh_work: I think the issue is the voltage drop across diode D4 | 07:48 |
| mithro | It should be 0.7V | 07:49 |
| mithro | The other issue could be that the power supply is providing less than 4V | 07:49 |
| rohitksingh_work | yeah. nominal voltage drop across diode should be 0.7v | 07:49 |
| rohitksingh_work | I'll just check it...building the firmware right now | 07:50 |
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| rohitksingh_work | mithro: I'm getting 3.17V on 3V3 lines, 3.45V on 4V0 line and the diode voltage drop hence calculated comes out 0.28V | 08:24 |
| mithro | rohitksingh_work: so, that seems wrong | 08:25 |
| mithro | rohitksingh_work: Anoop was the person who made the changes to that part of the design | 08:26 |
| rohitksingh_work | mithro: yeah. it shouldn't be affected by my input supply which is 9V instead of 12V, right? Switched power supplies have quite large volotage ranges | 08:26 |
| mithro | rohitksingh_work: Shouldn't do, but would be worth checking by supply a proper 12V | 08:27 |
| rohitksingh_work | mithro: Ok. I'll check with that also... | 08:27 |
| rohitksingh_work | mithro: with 12V supply, still 3.18V on 3V3 lines, 3.46V on 4V0 lines, and diode voltage drop again comes out to be 0.28V | 08:32 |
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| mithro | rohitksingh_work: Can you have a chat with Anoop and see if this is expected or not? | 08:32 |
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| rohitksingh_work | mithro: actually he is out on leave since yesterday. will be coming back on 22nd. I'll mail him on this matter though. | 08:33 |
| mithro | rohitksingh_work: you should check what is coming out the DisplayPort supply too | 08:34 |
| mithro | rohitksingh_work: have you got the schematic there? | 08:35 |
| mithro | rohitksingh_work: be back in an hour, dinner | 08:35 |
| rohitksingh_work | mithro: yeah. I've got the schematic. | 08:36 |
| rohitksingh_work | mithro: Displayport TX is showing 3.35 after diode dropout...and RX is showing 3.29 after Diode dropout...diodes are definitely quite inaccurate here, because same power supply rail is going to all diodes... | 08:40 |
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| tumbleweed | mithro: IIRC the 4V rail was a bit lower than 4V too | 10:23 |
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| mithro | 3.35 and 3.29 are close enough, 3.18V isn't really | 11:11 |
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