Wi-Fi Module Series
FGH100M_Hardware_Design 19 / 41
4.3. Power Supply
The module is powered by VBAT. It is recommended to use a power supply chip with sufficient up to 1.5 A.
For better power supply performance, it is recommended to parallel a 47 μF decoupling capacitor, and 1
μF and 100 nF filter capacitors near the module’s VBAT pin. In addition, it is recommended to add a TVS
near the VBAT to improve the surge voltage bearing capacity of the module.In principle, the longer the
VBAT trace is, the wider it should be.
VBAT reference circuit is shown below:
Figure 3: Reference Circuit of Power Supply
The VDD_FEM is the power supply for FEM whose reference circuit is the same as VBAT. The power
domains of I/O pins are determined by VDDIO which is connected to the same power as the host. There
are no timing requirements among VBAT, VDD_FEM and VDDIO, but the VDDIO power supply should
not exceed VBAT.
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