Quectel RM520N-GL - Page 34

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