Quectel RM520N-GL Hardware Design page 34

It is recommended to use a host GPIO to control FULL_CARD_POWER_OFF#. A simple reference circuit
is illustrated in the following figure.
Host
NOTE: The voltage of pin 6 should be no less than 1.19 V when it is at HIGH level.
The timing of turn-on scenario is illustrated by the following figure.
VCC(H)
FULL_CARD_
POWER_OFF#
RESET#
PCIE_CLKREQ_N
PCIE_RST_N
PCIE_REFCLK
Module Status
NOTE: When the module is in USB mode, please ignore the PCIe related signals and their timing parameters in the figure.
RM520N-GL_Hardware_Design
1.8 V or 3.3 V
GPIO
Figure 8: Turn on the Module with a Host GPIO
Module power-on
T
VCC-FCPO#
System turn-on and booting
T
FCPO#-CLKREQ#
T
FCPO#-PERST#
OFF
Figure 9: Turn-on Timing of the Module
FULL_CARD_POWER_OFF#
T
PERST#-RST#
T
REFCLK-PERST#
Booting
5G Module Series
Module
6
R1
PMIC
100k
3.7 V
≥1.19 V
V
IH
1.8 V
Active
33 / 84