UM220-INS Series Modules User Manual
UC-00-M10 EN R1
Introduction
4
2.3
Interfaces
RF_IN
LNA
UFirebird
MEMS
(
Gyro
,
Acc
)
UART
RST
SRAM
GNSS RF
CPU
ROM
GNSS
Baseband
Interface
UM220-INS
Vbackup
RTC
VCC
1PPS
TCXO
FWD
WHEEL TICK
SAW
Figure 2-2 UM220-INS Series Modules Block Diagram
UART
UM220-INS series modules support two configurable UART ports. COM1 is the main
serial port, which supports data transfer and firmware upgrade function, the signal
input/output is LVTTL. The default baud rate is 115200bps, and can be configured up to
230400bps.
Ensure that COM1 is connected to a PC or an external processor for
firmware upgrades.
COM2 is limited to support data transmission, and can’t be used for firmware upgrade.
Odometer (FWD/WHEELTICK)
The UM220-INS series modules have an odometer input interface including FWD and
WHEELTICK, which are useful for improving the module’s location accuracy.
MEMS
UM220-INS series modules integrates six-axis MEMS, three-axis gyro and three-axis
accelerator on board. MEMS provides information on carrier attitude and speed
changes, which are combined with GNSS to perform a combined navigation calculation.
This combination ensures much more continuous and uninterrupted positioning than
standalone GNSS, especially in the conditions with poor signal.