UB4B0M User Manua
l
8
Use VCC pin to provide reliable power source and earth all GND pin of the board
MMCX interface provides 4.6
±
0.2 V feed, and notice 50
Ω
impedance matching
for the circuit. Do not connect the antenna to the port of antenna in the module,
and use a multimeter for testing, that is, the voltage supply is DC 4.8 V ~ 5.4 V
when there is no-load. When the RF port of the module is connected to the
antenna, the working current is 30~100 mA at normal temperature, and the
antenna feed of DC 4.6 V
±
0.2 V can be supplied to the outside.
Ensure the output of serial port 1. Users need to use this serial port to receive the
positioning data and to update the software
In order to acquire satisfactory performance, the following points should also be
particularly noticed:
Power supply: Satisfactory performance cannot be achieved without a stable and
low-ripple power source. The peak value of the ripple voltage should not exceed
50mVpp. In addition to adopting LDO to guarantee uninterruptible power supply,
the following points should also be taken into consideration:
‒
Widen power supply wires or use split copper pour surface to transmit
current
‒
Try to place LDO close to the board
‒
Power supply wires should not pass through any high power and high
inductance devices such as magnetic coils
UART interface ensures that the signal and baud rate of the main device are
consistent with those of UB4B0M.
Antenna wires should be as short and smooth as possible; avoid sharp angle
and pay attention to impedance matching.
Avoid wiring right beneath UB4B0M.
Keep the board away as far as possible from any high temperature airflow.
