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FIBOCOM NL668-LA Series Hardware Guide
Page 21 of 61
4 Electrical Characteristics
4.1 Power
Table 4-1 show the power interface of NL668-LA series module.
Table 4-1 Power interface
Pin Name
I/O
Pin
Description
VBAT_RF
PI
57, 58
Module power supply, 3.3V~4.3V, typical value 3.8V
VBAT_BB
PI
59, 60
Module power supply, 3.3V~4.3V, typical value 3.8V
VDD_EXT
PO
7
Module digital voltage output, 1.8V, 80mA
GND
G
8, 9, 10, 19, 22, 36, 46,
48, 50
–54, 56, 72, 76,
85
–112
All GND pins must be grounded
Note:
In the rest of the document, VBAT includes VBAT_BB and VBAT_RF.
4.2 Power Supply
The NL668-LA series module needs to be powered by the VBAT pin. The recommend power design is
shown in Figure 4-1:
Figure 4-1 Recommend power design