[time-nuts] DeLorme Tripmate GPS receiver

Ryan Stasel rstasel at uoregon.edu
Mon Dec 22 19:41:01 EST 2014


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?

-Ryan Stasel

> On Dec 21, 2014, at 23:07 , ed breya <eb at 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
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