Hello there.
What is the lowest current consumption of L96K: ww w.quectel.com/product/gnss-l96/ if only V_BACKUP is connected to VCC (from LDO) and the module is power off via load switch? To my understanding according to specifications it’s 8μA, but in reality I have over 200μΑ.
I have the I2C firmware $PQVERNO,R,L96NR11A02SC,2023/05/29,02:33*2A
Do I have to send a command first? I shutdown the gps with a MCU pin.
Hi @clavisound
Apologies for the late reply
For backup mode before cutting off the VCC a command is needed to be send in order to allow module to enter proper backup mode
$PMTK225,4*2F
If VCC is cut before the command the module will go into a stateless function which will cause the module to consume much more power.
Best regards,
Thanks,
better late than never 
are you sure? 225,4 is periodic standby, I currently using 161,0 (standby)
I don’t have connected FORCE_ON, I suppose this is problem to use 225,4 according to: Backup mode with PMTK during VCC powered - #4 by Raphael-Q
L96_Hardware_Design file, p. 18
3.4.3. Backup Mode
Backup mode requires lower power consumption than standby mode. In this mode, the module stops
acquiring and tracking satellites. UART is not accessible. But the backed-up memory in RTC domain
which contains all the necessary GNSS information for quick start-up and a small amount of user
configuration variables is alive. Due to the backed-up memory, EASY technology is available. The current consumption in this mode is about 7uA.
There are two ways to enter into backup mode and back to full on mode.
1 Send command “$PMTK225,4*2F” (the signal marked red line opens the switch in Figure 3) to enter
into backup mode forever. The only way to wake up the module is pulling the FORCE_ON pin high
(the signal marked red line closes the switch in Figure 3).
2 Cutting off VCC and keeping V_BCKP powered will make the module enter into backup mode from
full on mode. As long as the VCC pin is powered, the module will enter into full on mode immediately.
I am using 2nd method, it’s not recommended?
Hi @clavisound
It is not recommended to use step 2 as a way to enter backup mode. it is advised to follow the below sequence
VCC connecting → Sending $PMTK225,4*2F → VCC disconnecting power → Recover VCC → Pulling up FORCE_ON >50ms → Wake up
