LC79D current consumption with memory backed up

we’d like to use LC79D and have the module sleeping between tracking sessions. Comparing to L86 or L96 it seems that sleep/standby with memory backed up (so wakeup can be considered as a hot start) consumes a lot of energy. Those modules can be put into Backup mode that keeps RTC and memory running, so waking up is a hot start. It seems that LC79D has Sleep mode that has the same functionality, but the consumption is much higher:

  • L96 Backup mode with RTC and memory backed up: 7uA @3.3V
  • LC79D Sleep mode with RTC and memory backed up: 200uA @1.8V
  • LC79D Standby mode with only RTC running: 17uA @1.8V

Important text from L96 Hardware design document describing its Backup mode:

The backed-up memory in RTC domain which contains all the necessary GNSS information for quick start-up and a small amount of user configuration variables is alive. Due to the backed-up memory, EASY technology is available.

Is it possible to achive similar current consumption with LC79D? We cannot use LTO download because the device does not have data connection that would support big enough data transfers.

Dear rastik,
Sorry for the delay.
Now we have no way to optimize its power consumption.
LC79D standby mode has equivalent power consumption compared to L96 backup mode. But when LC79D wakes up from standby mode without LTO, it needs more than ~30 seconds to get fix, which consumes more power.

Best Regards

Thank you for the clarification. Is there any way to backup current satellite data externally? Like we query almanac/efemeris data that the module acquired from the satellites and once woken up later feed it back to the module?

Dear Rastik,
Currently our GNSS modules don’t support such operation.
Thanks for your understanding.
Best Regards