| 00:02.12 | CosmicPenguin | That must be it |
| 00:12.52 | joe_bleau | Jeez, it seems like half the stuff on my bench is broken right now. |
| 00:12.58 | joe_bleau | Tek plug-in with shorted tantalum. |
| 00:13.16 | joe_bleau | 1.2 kVA UPS: bad batts, stuck fans. |
| 00:13.33 | joe_bleau | HP 3466A meter: something's not right--CPU? |
| 00:13.50 | joe_bleau | Check engine light on the car on the way home. |
| 00:14.08 | joe_bleau | Oh, and my SGI Octane won't power on. |
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| 00:15.04 | Mirell | Your car is on your bench? |
| 00:15.36 | joe_bleau | Parts (ignition coils) are, actually! |
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| 01:25.02 | Mirell | HoHum. |
| 01:28.50 | Mirell | I no longer like working at home, methinks. |
| 01:32.00 | prpplague^2 | Mirell do tell |
| 01:36.24 | Mirell | Too damn lonely. |
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| 03:48.41 | LokiChaos | I have an PXA720 with host usb pins that go nowhere, I can tap them, but I have a feeling I need more than to just wire it to a USB port, what hardware do I need? (presumably soemthing to protect the CPU for static, overcurrent/volatge etc) |
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| 03:54.53 | MonMotha | LokiChaos: datasheet should say. Is that full speed or high speed? Some high speed need an external PHY. |
| 03:55.33 | LokiChaos | MonMotha: highspeed I think, let me check the sheet again |
| 03:56.55 | MonMotha | well, is it D+ and D- or is it a 4 bit parallel interface? |
| 03:57.09 | MonMotha | latter is ULPI while the former would just be the raw USB I/Os |
| 03:57.14 | LokiChaos | D+ D- |
| 03:57.50 | MonMotha | what you have to do with them will be specified in the datasheet. Sometimes you do need to provide a pull-down or series resistor. ESD is always a good idea if it's going off the board, of course. Otherwise, generally you just use it. |
| 03:57.58 | MonMotha | chances are, if you hook it up, it will work |
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| 04:03.59 | LokiChaos | seems like the datasheet has nothing on them, just that they are USBH_N and USBH_P |
| 04:05.27 | LokiChaos | and thare are seperate (confirmed) USBC_N and USBC_P that are for usb gadget |
| 04:06.22 | LokiChaos | on the topic, how would I go about protecting it from ESD? |
| 04:08.36 | MonMotha | usually the datasheet will have an application section on those lines |
| 04:08.41 | MonMotha | you sure you have a full datasheet and not just a summary? |
| 04:08.44 | MonMotha | for ESD, just clamp diodes |
| 04:08.50 | MonMotha | low capacitance is mandatory for high speed |
| 04:10.26 | LokiChaos | ok, I think I found the dev guide |
| 04:10.38 | LokiChaos | I had the datasheet, but not the devguide |
| 04:13.25 | LokiChaos | ok, as i thought I need to provide the 5V (cpu doesn't have contacts that support it) and something to protect the cpu from the 5v |
| 04:15.14 | LokiChaos | looks like just USB 1.1 which is fine for what I'd probably use it for (mouse, keyboard, maybe a Wireless dongle) |
| 04:15.28 | MonMotha | oh, yes, the CPU will not provide VBUS for you |
| 04:15.32 | MonMotha | you'll have to provide that |
| 04:15.52 | MonMotha | there should be some overcurrent protection on it. TI and Micrel both make a device that's exactly meant for this, or you can just use a PTC. |
| 04:16.14 | MonMotha | if you need to pass FCC or similar, a common mode choke on the data lines can help |
| 04:19.18 | LokiChaos | I'll look into the chips for overcurrent protection and ESD protections |
| 04:20.56 | LokiChaos | this is for the Zipit Z2, btw |
| 04:28.33 | LokiChaos | bah, a pin I need for USB host isn't on the edge of the CPU... |
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| 15:27.37 | chouimat|busy | morning |
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| 22:29.54 | Mirell | Morning. |
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