UM4B0 User Manual
3
1.4
Interfaces
RF in
RF
Fron
tend
SAW
Filter
Nebulas-II
MEMS Chip
UART
SPI
GPS
BDS
GLO
GAL
SBAS
Interface
Event
TCXO
I2C
ANT_PWR
PPS
Figure 1-2 Block Diagram
1.
RF Part
The receiver gets filtered and enhanced GNSS signal from the antenna via a coaxial
cable. The RF part convert the RF input signals into the IF signal, and convert IF analog
signal into digital signals required for Nebulas II die (UC4C0).
2.
Nebulas-II SoC
（
UC4C0
）
Nebulas-II (UC4C0) is Unicore’s new generation high precision GNSS SoC with 55nm low
power design, supports up to 12 digital intermediate frequency or 8 analog
intermediate frequency signals, which can track 12 navigation signals with 432 channels.
3.
MEMS
By deploying anti-interference function block and on-board MEMS device, UM4B0 can
maintain excellent application experience even in the most challenging environments
such as urban canyons.
4.
1PPS
UM4B0 outputs 1 PPS with adjustable pulse width and polarity.
5.
Event
UM4B0 provides 1 Event Mark Input with adjustable pulse width and polarity.
