UM220-IV NV User Manual
10
4
Hardware Design
4.1
Design in Considerations
To ensure that UM220-IV NV-GN works normally, please pay attention to the following:
Connect all the GND pins to ground.
Connect the RF_IN signal to the antenna, and the line should keep 50Ω impedance
matching
Ensure COM1 is connected to a PC or an external processor, users can use this serial
port to receive position data. COM1 is also necessary for firmware upgrades.
In order to obtain good performance, special concern should be paid during the design:
Power supply: Stable and low ripple power is necessary for good performance. Make
sure the peak to peak voltage ripple does not exceed 50mV.
−
Use LDO to ensure the purity of power supply
−
Try to place LDO close to the module in layout
−
Widen the power circuit or use copper pour surface to transmit current
−
Avoid walking through any high-power or high inductance devices such as a
magnetic coil
UART interfaces: Ensure that the signals and baud rate of main equipment match
that of UM220-IV NV module
Antenna interface: Make sure the antenna impedance matches, and the cable is short
and smooth, try to avoid acute angl
es
Antenna position:
In order to ensure a good signal-to-noise ratio, the antenna
should be well isolated from any electromagnetic radiation source, especially the
electromagnetic radiation in the frequency range of 1559 ~ 1607MHz
Try to avoid designing in any circuits underneath UM220-IV NV-GN
This module is a temperature sensitive device, dramatic changes in temperature
will result in reduced performance. Keep it away as far as possible from any high-
power high-temperature air and heating devices
.
