[time-nuts] Re: Question about TSC5110

[Razvan Popescu]

I looked at the datasheet for the M48T86 which on Mouser is obsolete but
the datasheet says it is pin compatible with DS12887.

The DS12887 is also obsolete but they have a newer version DS12887+ and
it costs € 12,49.

Here is the link: https://mou.sr/4esFgeW

Regards,
Razvan

On 16/06/2024 01:06, Jim Schatzman via time-nuts wrote:
> 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 The RTC is an STMicroelectronics M48T86PC1 which is obsolete.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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