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FIBOCOM FG621-LA Series Hardware Guide
Page 23 of 57
Figure 4-2 Power limit
4.3 Power Output
FG621-LA series module outputs a 1.85V voltage through the VDD_EXT for the use of the internal digital
circuit of module. The voltage is the logic level of the module and can be used to indicate module
power-on/off, or for external low current (< 50mA) circuits. FG621-LA series module outputs a 2.8V level
through the VDD_2V8 for the use of the internal RF or other circuits, with an output current of < 200mA.
Leave the signal floating if no use. The logic level of VDD_EXT and VDD_2V8 is defined as follows:
Table 4-3 VDD_EXT and VDD_2V8 logic level
Parameter
Min
Typ
Max
Unit
VDD_EXT
1.75
1.85
1.95
V
VDD_2V8
2.7
2.8
2.9
V
4.4 Power Consumption
The power consumption of FG621-LA series module measured at 3.8V power supply is shown in the
following table. For AT commands used for USB sleep and wakeup, please refer to section 6.2:
Table 4-4 Power consumption
Parameter
Mode
Condition
Average Current Typ.
(mA)
Ioff
Power off
Power-off
0.085
I
sleep
WCDMA
DRX8(USB sleep)
2.9
FDD-LTE
Paging Cycle #64(USB sleep)
4.2
FDD-LTE
Paging Cycle #256(USB sleep)
2.7
TDD-LTE
Paging Cycle #64(USB sleep)
4.2
