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

Rachel McConnell rachel at xtreme.com
Mon Mar 23 13:34:03 PDT 2009


That compass board is 4mm across.  There are 5 pads.  The pic on the
datasheet shows the pads right up next to a mm ruler, and in fact
further down it claims the distance across all the pads & the spaces
between is 2.5mm.  Given that, I don't see how the spacing could be as
big as .5mm but it is absolutely not any larger.

However, 0.05" is a lot bigger than 0.5 mm so if those are the only 2
options, I am baffled.  Or possibly just even more ignorant about what
'spacing' means than I thought.

R

Lamont Lucas wrote:
> 
> 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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>>
> 
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