Specifications

Module：EWN-8822CSS3AH
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13 Reference design
13.1 Power supply requirement
The module power supply voltage is DC+3.3V, and the maximum module current is 800mA.
The power supply design needs to consider the output current and power interference. To avoid
the +3.3V power supply from interfering with other circuits on the motherboard, it is
recommended to supply to the module using the regulator circuit alone. the recommended
DC-DC circuit structure shown in the figure below. A 4.7uF~10uF capacitor is connected in
parallel at 3_3VD output to filter out the interference. A bead is connected in series at 3_3VD
output. The bead and capacitor must be placed as close to the module as possible. If you need to
share +3.3V with other circuits, consider whether the current of the shared power supply is
sufficient.
FIG 16 Power supply Circuit schematic