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FIBOCOM L610-LA Series Hardware Guide
Page 22 of
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3.2 Power Supply
The power interfaces of L610 modules are shown in the following table:
Pin Name
I/O
Pin
Description
VBAT_RF
I
57,58
Module power supply, 3.4~4.2V,
nominal value 3.8V
VBAT_BB
I
59,60
Module power supply, 3.4~4.2V,
nominal value 3.8V
VDD_EXT
O
7
Voltage output, 1.8V
GND
-
8,9,19,22,36,46,48,50-54,56,85-112
Ground
3.2.1 Power Supply
L610 modules need to be powered by the VBAT pin. The recommended power design is shown in Figure
3-2:
Figure 3-2 Recommended Power Design
Note:
VBAT_RF and VBAT_BB are included in the subsequent documents.
Power filter capacitor design is shown in the following table:
Recommended
Capacitor
Application
Description
220uF x 2,10uf
Regulating capacitor
Reduce power fluctuations during
module operation, requiring low ESR
capacitor
LDO or DCDC power requires not
less than 440uF capacitor