UC-00-M15 EN R1.4
Hardware Design
22
4.6
Layout Recommendation
Power supply: Stable and low ripple power is necessary for good performance.
Make sure the peak-to-peak voltage ripple does not exceed 50mV.
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Use LDO to ensure the purity of power supply;
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Place LDO to the module as close as possible in layout;
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Widen the power circuit wiring or use split copper surface to transmit
current;
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Avoid the high–power or high inductance devices such as magnetic coil.
Antenna interface: note with the antenna impedance matching, and the circuit is
short and smooth, try to avoid acute angles.
Connect the RF signal to the antenna and make sure the 50 Ω impedance match
on the circuit.
Antenna location: to obtain a good signal-to-noise ratio, ensure that the antenna
is well isolated from electromagnetic radiation sources, especially
electromagnetic radiation in the frequency range of 1559 to 1605 MHz.
Try to avoid circuits below the UM220-IV L module.
UM220-IV L module is a temperature sensitive device, rapid temperature
changes will result in reduced performance. Keep it as far away from the high-
power high-temperature air and heating devices as possible.
