User's Manual

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8. Layout suggestion
8.1 Power supply precautions
• Module power: 3v button battery or DC 3.3v
• Connect the power pin capacitors as close as possible to
the chip and pins
• Use capacitors to decouple power from the chip
• Use capacitors to prevent noise from coupling back into the power plane
Note: When supplying power to the module, it is necessary to use a small ripple (generally,
the power ripple within 30mV is sufficient). It is recommended to use the LDO to power the
module when selecting the power supply. The LDO PCB layout needs to be away from some
inductive sensor, DC -DC power supply \ inductance, etc., in the PCB design, it is necessary
to have a reliable grounding process, and it must not exceed the maximum voltage used by
the module to prevent the module from irrecoverable damage.
8.2 Layout Guidelines
For ES201, the integrated antenna needs a proper ground plane to radiate efficiently.
The area protruding from under the antenna section of the module should be free of copper
and other metals.
The module should be placed on the edge of the PCB with the antenna edge facing outward.
The antenna needs to be processed for clearance during layout, and requires a sufficient
clearance area. (When designing, pay attention to both the top and bottom layers. If
conditions allow, it is recommended to hollow out the clearance directly when designing the
PCB board. No form of electrical operation is allowed in the projection area of the antenna to
ensure the radiation effect of the antenna.
EH-ES201 Datasheet