What type of connectors to order for bottom Zio pins?

[Timothy Howard]

Posted on February 05, 2017 at 15:45

Hello

I've established that the pins on bottom of Nucleo-F767ZI (144) are ST Zio connector � CN7, CN8, CN9, CN10 (relevant 2 pages from UM are attached).

I want to create PCB on top of which I will be able to plug in the Nucleo-144 board. What should I order, can anyone share advice? I tested that board's pitch of the bottom pins is 2.54 mm (because 2.54 mm ribbon cable fits, UM doesn't mention ''pitch'' word nor shows this on the mechanical drawing). The PCB for discovery board that I need to edit is following:

Pitch between the holes on left and right is correct, 2.54 mm. But what part should I use to be able to plug in the Zio pins that are on bottom of Nucleo? After I change PCB to have  2x10 (CN7), 2x8 (CN8), 2x15 (CN9), 2x17 (CN10) series of holes, to match Zio. Is my approach overall correct? I'll be transmitting DCMI data.

#nucleo-f767zi #nucleo #pcb #connector #pitch

[S.Ma]

Posted on February 05, 2017 at 19:00

Nucleo 144 looks like this:

The 4 black female pin headers around the QFP144 are compatible with Arduino Uno (2.54mm pitch) except that more signals are accessible by doubling the rows. (they mismatch from the presented bottom board layout).

I guess the unpopulated left and right dual row connectors are called ''MORPHO'' connectors as in the Nucleo 64.

In both cases classical dual row 2.54mm pitch headers.

[Dan Mackie]

Posted on February 06, 2017 at 01:22

SSW-136-01-T-D by SAMTEC is working for us.

 Cut these to length in a band saw, and avoid distributor delays while they cut it to length.

[Timothy Howard]

Posted on February 06, 2017 at 10:32

Thanks for the tip about cutting manually. Without this the price would be huge. There are 100 contacts total in ST-Zio, so I thought about ordering

http://www.newark.com/samtec/ces-150-01-t-d/board-to-board-connector-dual/dp/15P1321

. That's the cheapest 100 way strip in Farnell. It isn't SSW series (that one costs 30% more), will it fit?

[Dan Mackie]

Posted on February 06, 2017 at 14:38

I am not sure we are on the same page. We are soldering the SSW-136-01-T-D on our base board and plugging the Nucleo-144 directly into our matching cn7, cn8, cn9, cn10. Alignment is a pain with the left pair since ST preferred matching someone else's setup, instead of looking past that. At this stage we are not using the outside double row of holes on the Nucleo - cn11 and cn12. We are not yet shipping in volume. Stage 1 is getting a part that is available and works. Are you in North America?

Sent from my Samsung device

[Timothy Howard]

Posted on February 06, 2017 at 15:00

We are soldering the SSW-136-01-T-D on our base board and plugging the Nucleo-144 directly into our matching cn7, cn8, cn9, cn

Yes this sounds like what I want to do. Use the pins at bottom, which are basically ST Zio, but male connectors, not female as on the top. The outer double row holes are ST Morpho as far as I understand and I'm not using it. Counts of CN7, CN8, CN9, CN10 are 20 + 16 + 30 + 34 = 100, so I think I can order the

/external-link.jspa?url=http%3A%2F%2Fwww.newark.com%2Fsamtec%2Fces-150-01-t-d%2Fboard-to-board-connector-dual%2Fdp%2F15P1321

and cut it into 4 parts. I thought I will be able to use the mechanical drawing from User Manual to set distances between connectors for CN8 & CN9 and alse between CN7 & CN10, but surprisingly the drawing doesn't specify that distances. I tested that I could connect 2.54 mm ribbon cable across CN8 & CN9 so it looks it's like there is just 'missing' pin. But I will also have to somehow measure the distance between CN7 & CN10, maybe you know the value? I'm from Europe.

[Dan Mackie]

Posted on February 07, 2017 at 15:07

We lose one pin position on each band saw cut.  If you pick up a digital micrometer you can make all the machine-shop precision measurements you want for about $10 and a few minutes getting up to speed using it - a much better position than getting measurements from someone else.  You can find them on the internet.  I asked about your location to check whether you had access to our usual distributors in North America.  I am in Canada, and the Farnell (Newark here) price here was about $1.00 higher than Digikey for the SSW part.  We bought at least one other part before deciding on the SSW.   Having one in your hands (or two or three competing parts) to settle on is not a bad move.  There are tradeoffs.

[T J]

Posted on February 07, 2017 at 21:39

I use Aliexpress.com for connectors on prototypes,

SearchText=dual+row+pin+strip

10 Pcs 120Pin Female Dual Row Through Hole Mount Pin Header ($11.62 for 10 pieces)

I use cutters to trim the size, the bandsaw is a little too dangerous, we hardly use it.

[Dan Mackie]

Posted on February 08, 2017 at 15:50

Hi Nick,

Price is good, but how do you get delivery into a reasonable time frame?  They are talking 39-60 days delivery by mail, with no tracking.  Courier is $200 +.  If we change the 72 pin part (SSW-136-01-t-d) to the 100 pin SSW-150-01-T-D from Digikey.ca - they have 897 pieces in stock.  No cutting is needed at their end, and the price is $9.78 for one piece, and overnight shipping for $8.00.  The 100 pin part is much better value than the 72 pin part, when we are cutting them ourselves, and I have no interest in trying to cope with 39+ days shipping.  No tracking makes it even worse.

[T J]

Posted on February 08, 2017 at 20:34

My advice is to order 100 -1000 pieces and wait...  you will never run out of stock again.

Delivery is usually within 14-21 days...

Keep the parts stored in takeaway containers, they will last 30 years...

I ordered 1000 takeaway containers in 1985, I still have them, clean and strong.

The parts inside are still excellent.