Power Supply; Power Supply Pins; Decrease Voltage Drop - Quectel EG91 Series Hardware Design

NOTE
1. Airplane mode control via W_DISABLE# is disabled in firmware by default. It can be enabled by
AT+QCFG="airplanecontrol".
2. The execution of AT+CFUN will not affect GNSS function.

3.6. Power Supply

3.6.1. Power Supply Pins

EG91 series module provides four VBAT pins for connection with an external power supply. There are two
separate voltage domains for VBAT.
 Two VBAT_RF pins for module's RF part.
 Two VBAT_BB pins for module's baseband part.
The following table shows the details of VBAT pins and ground pins.
Table 6: Pin Definition of VBAT and GND
Pin Name Pin No.
VBAT_RF 52, 53
VBAT_BB 32, 33
3, 31, 48, 50, 54, 55, 58, 59, 61, 62, 67–74,
GND
79–82, 89–91, 100–106

3.6.2. Decrease Voltage Drop

The power supply range of the module is from 3.3 V to 4.3 V. Please make sure that the input voltage will
never drop below 3.3 V. The following figure shows the voltage drop during burst transmission in 2G
network. The voltage drop will be less in 3G and 4G networks.
EG91_Series_Hardware_Design
Description
Power supply for the
module's RF part.
Power supply for the
module's baseband part.
LTE Standard Module Series
Min. Typ. Max.
3.3 3.8 4.3
3.3 3.8 4.3
- 0 -
Unit
V
V
V
36 / 105