Best place to buy a Dallas DS12887A?

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Re: Best place to buy a Dallas DS12887A?

Postby Atari030 » Tue Jul 12, 2016 11:22 pm

My towered box already has a socket installed, I can help out, Chris. I still need some TOS ROM's anyway. :D

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Re: Best place to buy a Dallas DS12887A?

Postby exxos » Wed Jul 13, 2016 8:34 am

I got the battery connectors a while ago, but the ones on the SMT version are smaller, seems I forgot to order one to check :roll: I think the battery is physically smaller on the SMT one as the 2032 is to wide..

I got these ones, they look solid built, but if someone has some time to look though farnell for a quality (and smaller) battery socket then it would save me a some time.

http://uk.farnell.com/multicomp/ch7410-2032lf/battery-holder-smt-20mm/dp/2064724?ost=2064724&selectedCategoryId=&categoryNameResp=All%2BCategories&searchView=table&iscrfnonsku=false
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Re: Best place to buy a Dallas DS12887A?

Postby exxos » Mon Aug 15, 2016 10:32 am

Finally got a few mins to create the cell socket pads. This should be complete (copper fill is turned off in the image). Will hopefully be able to send off for 3 prototypes this week.

20160815112821.png
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Re: Best place to buy a Dallas DS12887A?

Postby catmando » Mon Aug 15, 2016 10:48 am

Nice one, looking forward to seeing these
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Re: Best place to buy a Dallas DS12887A?

Postby exxos » Mon Aug 15, 2016 11:14 am

catmando wrote:Nice one, looking forward to seeing these


I'll send you a PCB to fiddle with when they come. Wish I had put a socket in my falcon now :roll: :lol:
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Re: Best place to buy a Dallas DS12887A?

Postby alexh » Mon Aug 15, 2016 12:46 pm

Are there any low-profile sockets which enable fitting the Dallas (or equivalents) and still fitting the RF shielding?

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Re: Best place to buy a Dallas DS12887A?

Postby exxos » Mon Aug 15, 2016 1:29 pm

alexh wrote:Are there any low-profile sockets which enable fitting the Dallas (or equivalents) and still fitting the RF shielding?


You can get low profile sockets. The board is as small as possible, I don't know if it will fit under the shielding as I lost mine somewhere around 20 years ago :)
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Re: Best place to buy a Dallas DS12887A?

Postby leech » Tue Nov 01, 2016 12:29 am

Sweet! I did socket mine, the DS12885 doesn't seem to be working quite right, so am looking forward to one of these lower profile ones. Will be willing to verify it'll fit.

Edit: because Engrish is hard.
Last edited by leech on Wed Jan 25, 2017 11:29 pm, edited 1 time in total.
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Re: Best place to buy a Dallas DS12887A?

Postby exxos » Tue Nov 01, 2016 3:32 pm

leech wrote:Sweet! I did socket mine, the DS12885 doesn't seem to be working quite write, so am looking forward to one of these lower profile ones. Will be willing to verify it'll fit.


catmando has the first design. I'm just waiting for him to beta test it. I can't see anything being wrong but rather it be tested properly before others start fitting it.

Someone else is testing out a ST RTC board aswell currently. I've not much time to test out a lot of these things, so test boards are generally being shipped to people who are willing to build them up and test them. I only get 3 boards made, so I keep one and send 2 off to willing people.. if I can find what pile of junk those RTC PCBs in, if you can solder SMT stuff then Id be willing to post you a PCB to try. You will have to source the parts yourself though as I dont have stock of anything yet.
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Re: Best place to buy a Dallas DS12887A?

Postby catmando » Tue Nov 01, 2016 4:08 pm

exxos wrote:
leech wrote:Sweet! I did socket mine, the DS12885 doesn't seem to be working quite write, so am looking forward to one of these lower profile ones. Will be willing to verify it'll fit.


catmando has the first design. I'm just waiting for him to beta test it. I can't see anything being wrong but rather it be tested properly before others start fitting it.


Will hopefully be making up this evening :)
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Re: Best place to buy a Dallas DS12887A?

Postby leech » Wed Nov 02, 2016 3:27 am

Sweet, I haven't been brave enough to solder any SMT, though I have a hard drive controller board I have been meaning to swap the BIOS on to try to resurrect the drive. Maybe I will wait for the testing, then buy. I have more money than time at the moment.
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Re: Best place to buy a Dallas DS12887A?

Postby Maeslin » Wed Jan 25, 2017 10:42 pm

catmando wrote:Judging by this picture the SMT version looks no higher than the original Dallas chip, if so may even be able to install a slimline socket too


I'm actually the designer of that SMT version. I hadn't realized it had made the rounds so much! I made a number of them before realizing that local mail providers make it unreasonably expensive to ship (I won't make people pay ~$20 shipping for a $20 item)

I took the original down a while ago and made two updated versions. The first uses much larger holes and castellations to sit around the 'steps' in the two-way socket used, making it ~2mm lower and slightly narrower than the original. Unfortunately said castellations are somewhat of a ghetto version due to the limitations of the PCB fab house (they're really just through-hole pads cut in half, instead of proper castellated plating, so they usually need some manual cleanup). The 2nd updated version doesn't need a fancy socket and can be used with plain regular 'breakway' pinstrips.

They've also been slightly improved in that it is no longer necessary to remove pins. Even 'no connect' positions have holes, there's just no need to solder them.

Castellated version
Image


pinstrip version
Image


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