User's Manual

© 2017 M-Labs Technologies LLC 8 / 15
USB
The USB port is provided for provisioning or debug.
Relay Driver
A 500mA sink capable output pin is provided. This pin is meant to drive a relay coil indented to
interrupt the starter solenoid relay for the ignition circuit to a car.
Power and Battery
The battery monitor is internal analog input scaled such that the DC value of the power input
pin to the LTE
system is measured. This value is scaled to span the most significant 8 bits
of the A/D and consequently covers a scale from 0 to 25.5 Volts.
Timers
Timers resident on the baseband chip generate periodic interrupts for power down wakeup,
watchdog support, periodic report generation and other timer related functions.
Watchdog
SQN3223 chipset provides internal software Watchdog. The LTE device also includes an
MCU that acts as a failsafe external watchdog. The MCU power cycles the system, if no
activity is detected for 1 hour.
Accelerometer
The accelerometer can be used for motion detection and driver behavior monitoring.
2.2 Basic RF Performance
Items Requirements
Remark
TRP free space B2/B4/B12: >= 20 dBm TRP free space
TIS free space
Main: <= -91dBm
Div: <= -88dBm
TIS free space
Antenna loss <= -3dB TRP-TX Power Conducted
Antenna Loss <= -3dB
RX receive sensitivity conducted
– TIS
Board RF Specification
LTE_B4 RX
B4 Frequency range 2110-2155MHZ
Sensitivity -99.5dBm (10MHZ_50RB_Downlink)
Dynamic range
-23～-99.5dBm