> Le 23 déc. 2014 à 01:41, Ryan Stasel <rsta...@uoregon.edu> a écrit : > > Ed, > > Not 100% sure this is the same model, but it would seem to indicate there's a > PPS signal on the DCD pin (from the gpsd-users list circa 2007): > http://marc.info/?l=gpsd-users&m=118340900010559&w=2 > > Have a 'scope to check what that pin looks like? >
Unfortunately, according to <http://n3ujj.com/TripMate_Self_Start_Modification.html> , this signal is not available on the DB9 output. I have a working Jupiter TU60-D120 timing receiver which appears to use this chip (sourced from Sirf) which has a 1PPS on the headers pin6. I spent some time yesterday trying to trace back that pin to the 11577-11, but failed. I think I would need to probe it under power to go further but am hitting a couple of issues that are holding me up. The first is plain logistics. I have no free 12V power for the mother board (supplies buffered 10KHz and 1PPS on SMA plus a DB9 out) and the second more important is that I don’t know how to be sure of not shorting the 11577-11 pins when probing if it is power up. It’s a .5mm pitch chip and my probe which is pointed has the habit of slipping off the pins. There must be special tips to prevent that but I don’t have one. Any tips (as in help) appreciated. Another difficulty is keeping an eye on the scope while at the same time probing. This is a recurring problem that I don’t know how to fix. I expect that there are logic probes made for SMDs but I have none of those either. I will get a new 12V source after Xmas and have a careful poke. If anyone knows of a source of cheap(ish) isolated probes (or removable tips) or a convenient work around, I would appreciate the help. Happy holidays to all, Mike > -Ryan Stasel > >> On Dec 21, 2014, at 23:07 , ed breya <e...@telight.com> wrote: >> >> One thing I want to clarify - it is not a Jupiter GPS module - it just uses >> the chipset, presumably hooked up as in the application info. The board is >> proprietary, and there seems to be no standard electrical or operational >> interface as would be expected in an OEM GPS module. So, the only way to >> figure it out is to go by the chip details to see how it's supposed to work. >> >> previous message: >> >> I peeled open the shield can without too much deformation, so it can be >> restored. I found that it's a single board, with the DSP on one side, and >> the RF section on the other. It is a Rockwell chipset, with 11577-11 DSP, >> and 6732-13 RF. On searching I found that this seems to be called their >> Jupiter GPS from circa late 1990s - I found quite a lot of info at the >> module level, but not for the actual ICs, like pinout data. The set includes >> all the usual GPS stuff including 1 PPS, and is capable of several levels of >> on-ness. So, if the uP that makes it a DeLorme merely sets some control >> lines to activate it, then I should be able to override them to force it >> always on - if I can figure them out. If instead the uP programs something >> internal to the DSP to control power states, then fuggetabout it - it will >> be junk. >> >> So, does anyone know of the Jupiter chipset, and where to find chip-level >> info for these parts? >> >> Ed >> >> _______________________________________________ >> time-nuts mailing list -- time-nuts@febo.com >> To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts >> and follow the instructions there. > > _______________________________________________ > time-nuts mailing list -- time-nuts@febo.com > To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there. _______________________________________________ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
