[time-nuts] Re: Question about TSC5110

[Tom Knox]

Hi Jim;
I am not sure about the exact part number, but if I remenber correctly these use a RTC (real time clock chip) that look a lot like a Dallas memory chip
https://www.digikey.com/en/products/detail/stmicroelectronics/M48T58Y-70PC1/361258
M48T58Y-70PC1 | DigiKey Electronics<https://www.digikey.com/en/products/detail/stmicroelectronics/M48T58Y-70PC1/361258>
Order today, ships today. M48T58Y-70PC1 – Real Time Clock (RTC) IC Clock/Calendar Parallel 28-DIP Module (0.600", 15.24mm) from STMicroelectronics. Pricing and Availability on millions of electronic components from Digi-Key Electronics.
www.digikey.com
As far as swapping the board, perhaps it was just a touch of oxidation on the edge connector. You could try swapping them back and see what happens? Although I have seen several TSC5110A exhibit this due to a bad power supply.
Hope that helps.
Cheers,
Tom Knox
SR Test and Measurement Engineer
Phoenix Research Group / Ascent Concepts and Technology
4870 Meredith Way Apt 102
Boulder, Co 80303
Formerly of:
357 Fox Lane
Superior Co 80027
303-554-0307
actast at hotmail.com

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________________________________
From: Jim Schatzman via time-nuts <time-nuts at lists.febo.com>
Sent: Saturday, June 15, 2024 5:06 PM
To: Wilko Bulte <wkb at xs4all.nl>; Discussion of precise time and frequency measurement <time-nuts at lists.febo.com>
Cc: AC0XU (Jim) <James.Schatzman at ac0xu.com>; Jim Schatzman <james.schatzman at futurelabusa.com>
Subject: [time-nuts] Re: Question about TSC5110

Thanks for the suggestions!

The RTC is an STMicroelectronics M48T86PC1 which is obsolete. They are available from various sources, but not Digikey and Mouser. I have ordered some. I just have never seem them before, so I wasn't looking for a large DIP package to contain a battery.  Live and learn.  I am interested to see if the batteries are good in the available "new" parts, since they are no longer made.


At 04:21 PM 6/15/2024, Wilko Bulte wrote:
>Have you tried swapping the coprocessor cards back? It could be as simple as re-seating the cards, which in essence is what happened during the swap. I think a swap-back is worth trying.
>
>As for the battery question: is there per chance a "fat"/ high DIL chip in there marked Dallas or ST (SGS/Thompson) ? Those ICs have Li batteries in their 'backpack'. Replacing a depleted battery requires swapping the entire chip. I think they are speced for 10 years or so but generally last longer (at least in equipment I saw them in).
>
>Wilko
>
>> On 15 Jun 2024, at 23:55, AC0XU (Jim) via time-nuts <time-nuts at lists.febo.com> wrote:
>>
>> I have several TSC5110s. One stopped working after a period of high temps in the lab.  It wouldn't complete the boot process - just displayed the spash screen, flashed off, then splash screen again. Power cycling gave the same result. Replacing the compact flash card didn't help.
>>
>> Swapping cards between two units one at a time, there were no changes in behavior until I swapped the co-processor card. Then both units started working!
>>
>> I am not sure what that is about. But I notice another thing - I can't change the date/time on either unit. I suspect the CMOS battery, but I can't find it. The CPU boards don't have the standard CR2032 or anything I recognize as a battery.  When I try to set the date/time, the units freeze up and have to be power-cycled.
>>
>> Anyone know how to locate the battery on these CPU boards?
>>
>> Also, any thoughts on why swapping the co-processor cards made both units start working?
>>
>> Thanks!
>>
>> Jim
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