Quectel RG520N-AT - Power Supply Voltage Monitoring; Voltage Stability Requirements

5G Module Series
RG520N-AT_Hardware_Design 37 / 109
TVS
3V8_EN
L1
+5 V
GND
GND GND GND
C5 C6
R3
R4
R2
GND
R1
C1 C2 C3
C4
Figure 8: Reference Design of Power Supply
3.4.3. Power Supply Voltage Monitoring
AT+CBC can monitor the VBAT_BB voltage value.
3.4.4. Voltage Stability Requirements
The power supply range of the module is from 3.3 V to 4.4 V. Please make sure the input voltage will
never drop below 3.3 V.
1. To avoid corrupting the data in the internal flash, do not switch off the power supply when the
module works normally. Only after the module is turned off with PWRKEY or AT command, the
power supply can be cut off.
2. If you turn off the module by cutting off the power supply, do not power on the module until the
power drops to 0 V, or there is a risk that the module cannot be turned on.
NOTE