UM4B0 User Manual
10
Figure 3-2 UM4B0 Reference Design
3.3
Pins
Table 3-1 Pin Notes
Pin Name
Pin
I/O
Description
Notes
Power
Supply
VCC
31, 32
Power Voltage Supply Stable, clean low ripple power
supply, peak ripple power lower
than 50mVpp is preferred
ANT_PWR
5
Power Antenna
Power Supply
Voltage supply for
active antenna
GND
1, 3, 4,
6, 9, 14,
18, 25,
33, 34,
43, 47,
52, 55,
57, 58,
60
Power Ground
Connect all the GND signals to
ground. Better to use copper
pour surface.
Antenna
ANT_IN
2
I
Satellite Signal
Input
50 Ω impedance matching
UART
TXD1
35
O
COM1
Transmit Data
COM1 output, leave
unconnected if not used
