User's Guide

13
Design Notes
The following guidelines help to ensure a robust design and allowes regulation
conformity."
Power supply design
The emMesh has an integrated voltage regulator. Only a single external supply source
is needed. For best performances, make sure the supply voltage is within tolerance.
Limit the power supply ripple to 100mV maximum. Also make sure the supply source
can withstand peak current of 250mA. Adding a 100uF capacitor at the input will help
sustain the peak current demand of the emMesh."
Board layout
The emMesh is designed to be used as a standalone device or integrated in another
board, thus, it does not has any board layout requirement other than usual practice for
pcb design."
Antenna performance
The following suggestions help you achieve optimal antenna performance. "
Point the antenna up vertically (upright). "
Position the antennas away from metal objects whenever possible. "
If you place the device inside a metal enclosure, use an external antenna. "
Do not place any ground planes or metal objects above or below the antenna. "
For the best results, mount the device at the edge of the host PCB. "
Ensure that the ground, power, and signal planes are vacant immediately below the
antenna section."