Hi, all,
So we're getting some parts for a small board fab--it's that VCA thing I talked about a week or so back.
One of the biggest items in the BOM cost is the standard 10-pin mini JTAG header, Samtec FTSH-105-01-L-DV-K-A-P. It's now up to over four bucks!
What do you folks use instead?
Thanks
Phil Hobbs
-- Dr Philip C D Hobbs Principal Consultant ElectroOptical Innovations LLC / Hobbs ElectroOptics Optics, Electro-optics, Photonics, Analog Electronics Briarcliff Manor NY 10510 http://electrooptical.net http://hobbs-eo.com
Nothing. :-)
I mean it is just not on the BOM for high volumes and software developer can solder it themself if they need it for debuging.
Olaf
On a sunny day (Thu, 14 Feb 2019 11:33:34 -0500) it happened Phil Hobbs wrote in :
I bought some .1 inch IC socket strips, breakable, and use those for all test connectors:
It's the little JTAG, not the big one.
Looks like I can just put a resistor in series with !RESET and it'll survive being installed backwards, so I can probably just use an unshrouded header.
Cheers
Phil Hobbs
-- Dr Philip C D Hobbs Principal Consultant ElectroOptical Innovations LLC / Hobbs ElectroOptics Optics, Electro-optics, Photonics, Analog Electronics Briarcliff Manor NY 10510 http://electrooptical.net http://hobbs-eo.com
Phil Hobbs wrote in news: snipped-for-privacy@electrooptical.net:
So, it is a surface mounted and shrouded header?
I am sure there are several folks making them Go to google images.
Not just google. Search: "jtag header" (less quotes) and a bunch pop up and many with prices. I saw $0.69 each on one.
torsdag den 14. februar 2019 kl. 17.33.44 UTC+1 skrev Phil Hobbs:
don't mount it just make a bed of nails instead?
will a standard 1.27 header fit?
We just have a footprint so only PCB area cost
The connector is called TagConnect
TagConnect also comes with hooks for self sustained connection to the board
SAMTEC FTSH-105-01-L-D-K 2x5 $1.70
MOLEX 87831-1419 2x7 $0.62
There is a pogo sort of thing that pushes onto a pattern of plated-through holes, for free JTAG.
-- John Larkin Highland Technology, Inc picosecond timing precision measurement jlarkin att highlandtechnology dott com http://www.highlandtechnology.com
Some of our little ARM chips have to be programmed after they are soldered to the board.
-- John Larkin Highland Technology, Inc picosecond timing precision measurement jlarkin att highlandtechnology dott com http://www.highlandtechnology.com
Of course, but this happens on the production test systems with needles.
Olaf
so make a pcb with some pogo pins
Doesn't work for our volumes.
Yeah, we can do that, assuming there's a resistor to prevent a hard short from !RESET to +3.3V, which is what happens when you put the connector on the wrong way.
Since the Samtec one got itself written into the JTAG spec, they apparently have a license to coin money. I was hoping for a knockoff with the same footprint and key geometry.
Cheers
Phil Hobbs
-- Dr Philip C D Hobbs Principal Consultant ElectroOptical Innovations LLC / Hobbs ElectroOptics Optics, Electro-optics, Photonics, Analog Electronics Briarcliff Manor NY 10510 http://electrooptical.net http://hobbs-eo.com
Cute idea, thanks. Something like that might work fine, except that we need at least 9 pins.
Cheers
Phil Hobbs
-- Dr Philip C D Hobbs Principal Consultant ElectroOptical Innovations LLC / Hobbs ElectroOptics Optics, Electro-optics, Photonics, Analog Electronics Briarcliff Manor NY 10510 http://electrooptical.net http://hobbs-eo.com
Phil Hobbs
I guess we could, but our products are fairly expensive so the cost of the header is in the noise. It would be a minor project to set up a few pogo systems, and we'd have to change a lot of board layouts.
-- John Larkin Highland Technology, Inc picosecond timing precision measurement jlarkin att highlandtechnology dott com http://www.highlandtechnology.com
The Samtec ones are much much smaller (1.27 mm).
Cheers
Phil Hobbs
-- Dr Philip C D Hobbs Principal Consultant ElectroOptical Innovations LLC / Hobbs ElectroOptics Optics, Electro-optics, Photonics, Analog Electronics Briarcliff Manor NY 10510 http://electrooptical.net http://hobbs-eo.com
torsdag den 14. februar 2019 kl. 21.17.03 UTC+1 skrev John Larkin:
the pins can hit the existing layout
or the crazy, an one edge connector,
something like mini PCI-E is very small, if you only use part of it
For the Coresight debug header (10x2) looks like a 3M 30320-5002HB on my last couple of boards. 0.80 USD in 100's. No shroud.
--Spehro Pefhany
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