Quectel L76 Hardware Design

GNSS Module Series
L76&L76-L_Hardware_Design 26 / 59
WAKEUP
UART
Valid ValidInvalid
VCC
V_BCKP
Enter Backup
mode
Exit from
Backup mode
Sending
command
Pulling
WAKEUP
High
Valid
Invalid
Cutting off the
power supply
of VCC
Restore VCC
Enter Backup
mode
Exit from
Backup mode
Backup modeBackup modeContinuous mode
Continuous mode
Continuous mode
≥ 10 ms
Figure 7: Enter/Exit from Backup Mode Sequence
Keep WAKEUP pin open or low before entering Backup mode. Or else, the Backup mode will be
unavailable.
3.3.4. Periodic Mode
Periodic mode is a mode that can control the Continuous mode and Standby/Backup mode periodically to
reduce power consumption. It contains Periodic standby mode and Periodic backup mode.
The modules enter or exit from the Periodic mode through software commands. For more information
about these commands, see document [1].
The following figure has shown the operation of Periodic mode. When you send corresponding command,
the modules will be into the Continuous mode. After several minutes, the modules enter the Periodic
mode and follows the parameters. When the modules fail to fix the position in Run time, the modules will
switch to Second run time and Second sleep time automatically. As long as the modules fix the position
again, the modules will return to Run time and Sleep time.
The average current value can be calculated by the following formula:
I
periodic
= (I
tracking
× T1+I
standby/backup
× T2) / (T1 + T2)
T1: Run time, T2: Sleep time
NOTE

Quectel L76 Specifications

General

Brand	Quectel
Model	L76
Category	Motherboard
Language	English