Quectel RM520N-GL User Manual

5G Module Series
RM520N-GL_Hardware_Design 34 / 84
Table 9: Trun-on Timing of the Module
3.5. Turn off
For the design that turns on the module with a host GPIO, when the power is supplied to VCC, driving
FULL_CARD_POWER_OFF# pin LOW (≤ 0.2 V) or tri-stating the pin will turn off the module. Sending the
command AT+CFUN=0 is necessary before shutting down the module.
Following is the proper shutdown handshaking process for FULL_CARD_POWER_OFF#, which complies
with the M.2 specification. Only after this process is completed, can the module successfully shutdown.
1. The host sends AT+CFUN=0 to the module.
2. The module responds OK to the host after finishing all the essential shutdown tasks.
3. If the host receives ERROR, it should try again for AT+CFUN=0 until OK is received to carry on the
power off sequence.
For details about the command, see document [3].
Symbol
Min.
Typ.
Max.
Comment
TVCC-FCPO#
100ms
-
-
System turn-on time depending on the host.
TFCPO#-CLKREQ#
-
100 ms
-
The time when the module requests the PCIe clock from
the host.
TFCPO#-PERST#
100 ms
-
The time when the host GPIO controls the module to exit
the PERST# state.
TREFCLK-PERST#
100 μs
-
-
The time period during which REFCLK_P/M is stable
before PCIE_RST_N is inactive.
TPERST#-RST#
-
-
390 ms
The time when the host GPIO controls the module to exit
the reset state in advance. For the host GPIO, the time is
the maximum time that is allowed, while for the module's
RESET# pin, it is the minimum time that is allowed. The
time will continue to be updated.

Quectel RM520N-GL Specifications

General

Brand	Quectel
Model	RM520N-GL
Category	Wireless Router
Language	English