Monitor The Power Supply; Turn On - Quectel RM502Q-GL Hardware Design

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NOTE

To avoid damages to the internal flash, DON'T cut off the power supply before the module is completely

turned off by pulling down FULL_CARD_POWER_OFF# pin for more than 7 s, and DON'T cut off power

supply directly when the module is working.

3.3.3. Monitor the Power Supply

AT+CBC command can be used to monitor the voltage value of VCC. For more details, see

document [4].

FULL_CARD_POWER_OFF# (abbreviated as "FCPO#" in this document ) is used to turn on/off the

module. When the input signal is asserted HIGH ( ≥ 1.19 V), the module will turn on.

This input signal is 3.3 V tolerant and can be driven by either 1.8 V or 3.3 V GPIO. And it has internally

pulled down with a 100 kΩ resistor.

The following table shows the definition of FULL_CARD_POWER_OFF#.

Table 8: Definition of FCPO#

Pin No.

Pin Name

FULL_CARD_

POWER_OFF#

RM502Q-GL_Hardware_Design

I/O

Description

Turn on/off the module.

DI, PD

High level: Turn on

Low level: Turn off

5G Module Series

RM502Q-GL Hardware Design

DC Characteristics

max = 4.4 V

min = 1.19 V

max = 0.2 V

Comment

Pull down with a

100 kΩ resistor

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