Talk:Notes on using the OLPC developer boards: Difference between revisions

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Connector/LED documentation moved to main article.
Could somebody complete this (CN10, CN13, CN18, CN21, CN23 need info/confirmation), and move it to the main page? All questions are in italics. Pinout is wanted on a few connectors.


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==Connectors/LEDs==
* All of these numbers are allocated starting top left corner, allocated in scanline fashion.
* The '''front''' of the board is the side with the VGA connector and the Geode processor.
===Warnings===
* '''Just because it doesn't say it's changing, doesn't mean that it won't change!'''
* Do NOT confuse J1 with CN9! You will fry the audio!
* Do NOT populate both L36 and L37! (see CN23 PS/2 connector).


Excuse my ignorance, but what exactly <em>is</em> "canning" in the context of wireless hardware? I'm not completely foreign to electronics and associated jargons, but being involved with OLCP is the first time I've heard the term used in such a context.
===Back of board===
--[[User:Yangman|Yangman]] 14:56, 5 July 2006 (EDT)
* CN1: JTAG Connector for Marvell wireless chip.
* CN2: Old LCD Connector. Definition changing.
* CN3: External stereo audio line output (switched)
* CN4: USB
* CN5: External mono microphone connector (switched)
* CN6: USB
* CN7: USB
* CN8: Mono right side speaker connector (Pin 1: Right +, 2: Right -)
* CN9: Internal stereo speaker connector (Pin 1: Left -, 2: Left +, 3: Right -, 4: Right +)
* CN10: No longer exists (2-pin CN9 and CN10 were combined to 4-pin CN9)
* CN11: DC input jack (10V-24V; nominal 12V) Center positive.
* CON1: Unused large solder pads (was mini-PCI on pre-A-Test boards)
* D2: LED. Definition changing. Same output as D22 (front/back view).
* D3: LED. Definition changing. Same output as D21 (front/back view).
* D4: LED. Definition changing. Same output as D23 (front/back view).


Canning is RF encapsulation. It means putting a shield around the RF (radio frequency) components. You'll see on the board a copper border around the wireless space. A metal shield, in the form of a box with one side missing, is placed over this area, and soldered down. An RF shield decreases noise received, decreases noise emitted, and therefore increases range of the wireless circuit and antenna. It also helps the device to meet electromagnetic compatibility regulations, or other regulations concerning radios.
===Front of board===
--[[User:Quozl|Quozl]] 19:33, 5 July 2006 (EDT)
* CN12: CRT for developer boards only

* CON_ANT1: U.FL connector for left? antenna
Ah, so it literally is canning, like I suspected, and not some jargon. Thanks.
* CON_ANT2: U.FL connector for right? antenna
--[[User:Yangman|Yangman]] 01:58, 6 July 2006 (EDT)
* CN13: Wireless interface test points. Definition changing.

* CN14: Used for DCON Debugging. Definition changing.
== Please fix the LinuxBIOS discussion in this page ==
* CN15: Internal microphone connector (Pin 1: Gnd, 2: Audio)

* CN16: AMD Geode JTAG Connector
Please fix the LinuxBIOS discussion which is out of date.
* CN17: Used for DCON Debugging. Definition changing.
: Done - thanks. - [[User:JordanCrouse|JordanCrouse]] ([[User talk:JordanCrouse|Talk to me!]]) 12:32, 14 September 2006 (EDT)
* J1: Serial port connector. 3.3V levels. (Pin 1: 3.3V Power, 2: TxD, 3: RxD, 4: Gnd)
* CN18: CRT/LCD Jumper - 1/3 = CRT, Removed = LCD
* CN19: Unused and unsoldered jumper.
* CN20: Used for manufacturing (serial Flash programming). Requires special fixture.
* CN21: Battery connector (Pin 1: Gnd, 2: VBat). Battery is 5-cell NiMH, nominal ~6.0V.
* CN22: Battery sensor. Definition changing.
* CN23: Internal PS/2 Connector to keyboard & input module (Pin 1: TP Data, 2: TP Clk, 3: Gnd, 4: KB Data, 5: KB Clk, 6: Power). Power is 5V if L36 populated, 3.3V if L37. L36/L37 located above pin 6.
* D21: LED. Definition changing. Same output as D3 (front/back view).
* D22: LED. Definition changing. Same output as D2 (front/back view).
* D23: LED. Definition changing. Same output as D4 (front/back view).

Latest revision as of 16:32, 14 September 2006

Connector/LED documentation moved to main article.

Excuse my ignorance, but what exactly is "canning" in the context of wireless hardware? I'm not completely foreign to electronics and associated jargons, but being involved with OLCP is the first time I've heard the term used in such a context. --Yangman 14:56, 5 July 2006 (EDT)

Canning is RF encapsulation. It means putting a shield around the RF (radio frequency) components. You'll see on the board a copper border around the wireless space. A metal shield, in the form of a box with one side missing, is placed over this area, and soldered down. An RF shield decreases noise received, decreases noise emitted, and therefore increases range of the wireless circuit and antenna. It also helps the device to meet electromagnetic compatibility regulations, or other regulations concerning radios. --Quozl 19:33, 5 July 2006 (EDT)

Ah, so it literally is canning, like I suspected, and not some jargon. Thanks. --Yangman 01:58, 6 July 2006 (EDT)

Please fix the LinuxBIOS discussion in this page

Please fix the LinuxBIOS discussion which is out of date.

Done - thanks. - JordanCrouse (Talk to me!) 12:32, 14 September 2006 (EDT)
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