Power Supply; Decrease Voltage Drop - Quectel EM12-G Hardware Design

73 GND
74 3.3V
75 CONFIG_2
NOTES
1. Keep all NC, reserved and unused pins unconnected.
"*" means under development.
2.

3.3. Power Supply

The following table shows pin definition of VCC pins and ground pins.
Table 5: Definition of VCC and GND Pins
Pin No.
2, 4, 70, 72, 74
3, 5, 11, 27, 33,
39, 45, 51, 57, 71,
73

3.3.1. Decrease Voltage Drop

The power supply range of the module is from 3.135V to 4.4V. Please make sure that the input voltage will
never drop below 3.135V, otherwise the module will be powered off automatically. The following figure
shows the maximum voltage drop during radio transmission in 3G and 4G networks.
VCC
Min.3.135V
EM12-G_Hardware_Design
GND
VCC
CONFIG_2
Pin Name I/O
VCC PI
GND
Max Tx power
Ground
PI Power supply
Not connected internally.
EM12-G is configured as
WWAN-USB 3.0.
Power Domain
3.135V~4.4V
Max Tx power
Drop
LTE-A Module Series
EM12-G Hardware Design
Vmin=3.135V
Vnorm=3.7V
Vmax=4.4V
Description
3.7V typical DC supply
Ground
Ripple
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