[Cyborg] Fwd: [Noisebridge-discuss] Re: March Digikey Bulk Order

Lamont Lucas lamont at cluepon.com
Mon Mar 23 13:16:47 PDT 2009


Oh, and cause I like replying to myself, here's another board adapter 
that I thought would allow us to mount the chip with just a fine point iron:

http://www.schmartboard.com/index.asp?page=products_plcc&id=85

$9, but I think it's the wrong board.

it *says* PLCC-20, but the pin spacing is 0.05", (1.27mm) whereas we 
need 0.5 mm spacing according to the datasheet for the HMC5843.  I'm 
starting to wonder if the datasheet is wrong, as every other source I've 
found says 0.05" for the PLCC, but honeywell claims 0.5mm.

The other PLCC-20 smt adapter board that I have also has an incorrect 
pin spacing in inches, so I'm left wondering what the hell honeywell is 
doing, seeing as what they're calling PLCC has nothing to do with what 
the rest of the world does.  (PLCC, plastic leadless chip carrier)

I'll try and make an adapter board in eagleCAD tonight and submit it for 
folks' inspection. 


Finally, here's someone on sparkfun trying to use the chip with no love:

http://forum.sparkfun.com/viewtopic.php?p=68979#68979

I'll hopefully get a response back from him, as he's successfully 
mounted the chip, even if he can't use it correctly.

Lamont Lucas wrote:
>
> Please add one more to the order for me, and I'll work with you on 
> surface mounting the thing.  I have a hot-air rework station that will 
> be useful for undoing whatever we mess up.  I've used a toaster oven 
> for SMT reflow, but I'd like to do this with a regular hot-plate, as I 
> think that method is superior.
>
> We'll need to either order an adapter PCB for the PLLC-20 (aka 
> LPCC-20), or make a custom one.  The board I have from sparkfun for 
> the Honeywell HMC1052L is a 4 pin-per-side 16-pin-LLC.  I'm capable of 
> designing and ordering the adapter board, but I wouldn't get a chance 
> to do it till tuesday night at the earliest, and I'm out of town for a 
> week starting friday.
>
> This solderless socket might help with the prototyping: 
> http://www.chiptool.net/adapter/plcc-1.htm
>
> That 1052L chip, by the way, I spent the weekend trying to use.  
> Unlike the HMC5843, the HMC1052L requires a 400 mA pulse for 2 uS to 
> clear out any lingering magnetic fields, which requires an h-bridge or 
> at least a totem-configured pair of FETs.  I started wiring it up, but 
> after I've added an h-bridge chip, 2 capacitors, two resistors etc, 
> the resulting cost and bulk make me think that I should have just 
> started with the $19 5843, rather than "saving" via the $8.50 1052L.
>
> That BUB board looks nice, although I'm still super happy with my FTDI 
> cable, just for compactness's sake.
>
> Adam Skory wrote:
>> I want to order two of the HMC5843 3-axis compass chips in the hope
>> that someone will help me figure out how to surface mount the damned
>> things.
>>
>> ( 
>> http://parts.digikey.com/1/parts/1599656-sensor-magnetic-3-axis-20-lcc-hmc5843.html 
>>
>> )
>>
>> Anyone else want some? It would be good to add them to today's digikey
>> bulk order.
>>
>> Also, I'm looking at getting some RBBB kits and a couple USB BUB
>> boards, separately from the digikey order, but it would good also to
>> know how many of those we should get.
>>
>> ( http://moderndevice.com/RBBB_revB.shtml and
>> http://www.moderndevice.com/connect.shtml )
>>
>> -Skory
>>
>>
>> ---------- Forwarded message ----------
>> From: miloh <froggytoad at gmail.com>
>> Date: Mon, Mar 23, 2009 at 10:52 AM
>> Subject: [Noisebridge-discuss] Re: March Digikey Bulk Order
>> To: noisebridge-discuss at lists.noisebridge.net
>>
>>
>> RE:  Digikey bulk order
>>
>> Correction:  didn't mean to suggest one needs to find dr_jesus on IRC,
>> the directions for being included are posted on the wiki:
>> https://www.noisebridge.net/wiki/Digikey_Bulk_Order
>>
>>
>>
>>
>> On Mon, Mar 23, 2009 at 9:40 AM, miloh <froggytoad at gmail.com> wrote:
>>  
>>> Friendly reminder: the March Digikey is going out by the afternoon, 
>>> contact dr_jesus in IRC to get in on the action.
>>>
>>> -rma
>>>     
>>
>>
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>>
>>   
>
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