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NNTP-Posting-Date: Sat, 09 Mar 2024 17:24:48 +0000
From: John Larkin <jl@997PotHill.com>
Newsgroups: sci.electronics.design
Subject: Re: using a pi 400 to debug a pico
Date: Sat, 09 Mar 2024 09:23:24 -0800
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On Sat, 9 Mar 2024 01:26:48 -0000 (UTC), Jasen Betts
<usenet@revmaps.no-ip.org> wrote:

>On 2024-01-18, john larkin <jl@650pot.com> wrote:
>> On Wed, 17 Jan 2024 12:16:29 -0800 (PST), whit3rd <whit3rd@gmail.com>
>> wrote:
>>
>>>On Tuesday, January 16, 2024 at 11:02:40?AM UTC-8, john larkin wrote:
>>>
>>>> This is a first pass at the dev board. 
>>>> 
>>>> https://www.dropbox.com/scl/fi/709v4pqjhe91jnwqh4wvg/Z566_Sch_2.jpg?rlkey=fjq3a9re53cv5l0zn9ya00akk&raw=1 
>>>> 
>>>> It would be used in development and production test. Every 
>>>> RP2040-based board would have the small-pitch 20 pin ribbon cable 
>>>> header. 
>>>
>>>Why bother with pins, and ribbon connector insertion force?   Just print
>>>test point pads, a few alignment holes, and make a plug of
>>>spring pins.    It's not like you need this access while the unit is
>>>bolted into its box and racked into a larger system.
>>>
>>>Do it with two different diameter alignment pins, so it doesn't get
>>>reversed.   A captive  nut to retain it would be useful, too.
>>
>> Too much work!  We can buy the ribbon cables and connectors from
>> stock.
>
>True, you'd have to order from digikey and wait a day to get such a
>connector (tag connect)
>
>we use the Tag Connect TC2030IDC connector intended for PIC programming to
>program our ESP32 boards one end plugs right into the ESP-prog, no
>modification is needed.
>
>The price seems to have dropped recently, perhaps a patent has
>expired, also I'm seeing Chinese clones now.

A 20 pin half-pitch ribbon cable would take, if anything, less board
area, and be less wobbly. And has 20 connections! I could use a 16 pin
ribbon connector, but I have plans for all 20. I want to do more than
just JTAG a CPU.