Monitor The Power Supply; Turn On And Off Scenarios; Turn On The Module Using The Ful_Card_Power_Off - Quectel EM05 Hardware Design

3.5.3. Monitor the Power Supply

AT+CBC command can be used to monitor the VCC voltage value. For more details, please refer to
document [2].

3.6. Turn on and off Scenarios

3.6.1. Turn on the Module Using the FUL_CARD_POWER_OFF#

The following table shows the pin definition of FUL_CARD_POWER_OFF#.
Table 7: Description of FUL_CARD_POWER_OFF# Pin
Pin Name Pin No.
FUL_CAR
D_POWER 6
_OFF#
EM05 can be turned on by driving the FUL_CARD_POWER_OFF# pin to a high level.
It is recommended to use a GPIO from host to control the FUL_CARD_POWER_OFF#. A simple
reference circuit is illustrated in the following figure.
Host
The module can also turn on automatically. The FUL_CARD_POWER_OFF# should be pulled up to 1.8V
or 3.3V (recommended) through a resistor, whose resistance should be 5kΩ~10kΩ. In this case, when the
power supply of VCC is cut off, the module will be shut down.
EM05_Hardware_Design
Description
A signal control to power on/off
the module. When it is at low
level, the module powers off.
When it is at high level, the
module powers on.
It is pulled to low
internally.
1.8V or 3.3V
GPIO
GND
Figure 8: Turn on the Module Using GPIO
DC Characteristics
For 1.8V:
V max=2.1V
IH
V min=1.19V
IH
V max=0.5V
IL
For 3.3V:
V max=3.6V
IH
level
V min=2.0V
IH
V max=0.8V
IL
Module
FUL_CARD_POWER_OFF#
GND
Confidential / Released
LTE Module Series
EM05 Hardware Design
Comment
Pulled down internally
24 / 59