[time-nuts] ***SPAM*** Motorola Oncore UT+ firmware upgrade & backup power questions
michael.cook at sfr.fr
Sat Mar 14 07:56:05 EDT 2015
>> If true, what is the maximum current that can be
>> safely supplied by the pin? As above, is it safe to use a
>> non-rechargeable battery like a CR2032?
> I have a couple of UT+ receivers which were not equipped with batteries and I used a CR2032 for backup without any issue. They were disconnected sometimes for considerable periods on a number of occasions and the saved data was always accessible on power up. I don’t know how long a battery like that lasts. I have one, powered off, still with the battery in circuit that I pulled in 12/2010. Hmmm. might be worth powering it on to see.
Well, I dug it out and checked the voltage across the CR2032. Down to 2.8volts after 4yrs 3mths. Connected up the receiver ad powered up.
It came up in position hold mode with the coordinates that were stored in 2010. 1PPS is on but I am only seeing 2 sats and am not to sync’d to UTC. I think the almanac may be no good. I’ll leave it a while and see if t recovers.
Anyway. Using a CR2032 is OK, at least with my hardware and you get backup for at least 4 years.
More information about the time-nuts