Product Info

5G Module Series
RM502Q-GL Hardware Design
RM502Q-GL_Hardware_Design 26 / 77
internal LDO output) HIGH level, which is typically 68 ms.
3. t
0
is the time interval between VCC and FULL_CARD_POWER_OFF# HIGH level. It could be 0 by
turning on the module automatically as shown in Figure 7, or any other time decided by the host as
shown in Figure 6.
t
booting
is the time interval between RFFE_VIO_1V8 HIGH level and the USIM_VDD power-on.
3.4.2. Turn off the Module
3.4.2.1. Turn off the Module through FULL_CARD_POWER_OFF#
In Figure 6, pulling down the FULL_CARD_POWER_OFF# pin will turn off the module. The turn off
scenario is illustrated in the following figure.
VCC
FULL_CARD_POWER_OFF#
RUNNING OFF
Module Status
Power-off procedure
RESET_N(H)
≥10 s
Figure 10: Turn-off Timing through FULL_CARD_POWER_OFF#
3.4.2.2. Turn off the Module through AT Command
It is a safe way to use AT+QPOWD command to turn off the module. For more details about the
command, please refer to document [2].
For the circuit design of Figure 6, please pull down FULL_CARD_POWER_OFF# pin, or cut off power
supply of VCC after the module USB/PCIe is removed. Otherwise, the module will be powered on again.