5. Functional Interface
5.1. Power Supply
The following table describes the power interface of FM101-NA-20 module.
Table 13. Power interface
Pin Name
I/O
Pin Number
Description
VBAT
PI
2,4, 70, 72, 74
Module power supply, 3.135V–4.4V, 3.8V is
recommended
GND
G
3, 5, 11, 27, 33, 39,
45, 51, 57, 71, 73
GND, all GND pins must be grounded
Power Input
The FM101-NA-20 module is powered on through the VBAT pin. The following figure
shows the recommended power supply design.
Figure 3. Recommended power supply design
The filter capacitor design of power supply is shown in the following table.
5. Functional Interface
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