Store RTC data for hot start

Projects Networking, Protocols, and Devices
1

Hi, I am using GPS module MAX-m8c with atmaega328p. I am trying to do hot start for my GPS, the GPS is running when it's needed. The problem that i need V_back battery to achieve the hot start so that the module run all the time and RTC still saved.
Is there any alternative option to not use backup battery and store the RTC data in the micro-controller so i can reach it when the GPS is running again?
Thanks

2

anas8686:
Is there any alternative option to not use backup battery and store the RTC data in the micro-controller so i can reach it when the GPS is running again?

I really do wonder why on earth you would want to do that, and what use the data would be if you did.

I am using GPS module

I also wonder why you are using an RTC at all.

3

anas8686:
Hi, I am using GPS module MAX-m8c with atmaega328p. I am trying to do hot start for my GPS, the GPS is running when it's needed. The problem that i need V_back battery to achieve the hot start so that the module run all the time and RTC still saved.
Is there any alternative option to not use backup battery and store the RTC data in the micro-controller so i can reach it when the GPS is running again?
Thanks

The issue is not the RTC, but the satellite data that the GPS holds in memory so it does not need to do a cold start all the time.

Not aware of a way of reading that satellite data out and saving it and it needs to be refreshed on a regular basis in any case. You could ask Ublox, its their GPS.

You need to supply a voltage to the GPS V_back. Some GPS have a small battery or supercap for V_back, but they will be flat in a couple of weeks of hot fixing and the GPS goes back to cold fixing.

You need a GPS board that breaks out the V_back so you can connect it to VCC or similar.

4

Nick_Pyner:
I really do wonder why on earth you would want to do that, and what use the data would be if you did.I also wonder why you are using an RTC at all.

Nick_Pyner:
I really do wonder why on earth you would want to do that, and what use the data would be if you did.I also wonder why you are using an RTC at all.

Read page 5 to understand why