User Guide

The module power supply voltage is DC+3.3V, and the maximum module current is 1000mA.
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 11 Power supply Circuit schematic
The USB interface must be designed as 90 Ohm difference line and Surround the data line
with ground copper.