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NNTP-Posting-Date: Mon, 11 Mar 2024 15:04:16 +0000
From: John Larkin <jl@997PotHill.com>
Newsgroups: sci.electronics.design
Subject: Re: using a pi 400 to debug a pico
Date: Mon, 11 Mar 2024 08:02:50 -0700
Organization: Highland Tech
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On Mon, 11 Mar 2024 05:38:52 -0000 (UTC), Jasen Betts
<usenet@revmaps.no-ip.org> wrote:

>On 2024-03-09, John Larkin <jl@997PotHill.com> wrote:
>> On Sat, 9 Mar 2024 19:51:58 -0000 (UTC), Jasen Betts
>><usenet@revmaps.no-ip.org> wrote:
>>
>>>On 2024-03-09, John Larkin <jl@997PotHill.com> wrote:
>>>> On Sat, 9 Mar 2024 01:26:48 -0000 (UTC), Jasen Betts
>>>><usenet@revmaps.no-ip.org> wrote:
>>>>
>>>>
>>>> Why do many of the target PCBs have four additional giant holes?
>>>
>>>For the retaining hooks, AKA "legs", these are optional.
>
>
>> I think they are some sorts of stabilizers; must make the connections
>> more reliable. 
>
>They are plastic hooks they make the connection more reliable by
>maintaining it hands-free. Without them you must hold the connector
>to the board fighting the spring force of the pogo-pins.
>
>> They really blow up the board area. I like my 20-pin
>> ribbon connector better.
>
>Yes.
>
>> I can sneak the ribbon cable out of a closed box, for temperature
>> testing or whatever. And bring out more signals. That pogo thing
>> sticks up.
>
>It seems unsuited for your application.

The real advantage of the pogo thing is its small cost saving, which
matters in high-volume, low margin products.

In high volume, one could both JTAG and access all the other signals
(like the ones I want) with a whole-board pogo fixture, but that has
downsides too.