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wishing to defeat its operation.
UART
A UART is provided for AT command and data interaction and optionally for connection to
peripheral sensors
Relay Driver
A 500mA sink capable output pin is provided. This pin is meant to drive a relay coil indented
to operate a door opening device.
1-Wire Bus Interface
The 1-Wire bus interface can be connected to sensors that support the 1-wire serial protocol
such as Temperature sensors or driver identification.
3.3V Power Out
3.3V Power output is available to power peripheral sensors such a cargo sensor. The power is
turned on only when the peripheral sensor is being read to save power.
Input Voltage and Battery Voltage Monitor
The Input Voltage monitors and battery voltage monitor are internal analog inputs scaled such
that the DC value of the voltage input pin to the PM-L system and internal battery voltage 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 32V for Input Voltage and 0 to 9V for internal battery voltage
Timers
Timers resident on the baseband chip generate periodic interrupts for power down wakeup,
watchdog support, report generation and other timer related functions. Report timers are
supported by related AT command and cause generation of periodic reports.
Watchdog
The Quectel EC21-A chipset provides internal software Watchdog. Also the PM-L includes
an MCU that acts as a failsafe external watchdog.
Motion Detect
Configurable through AT commands the unit can go to a low power mode when the main
power is removed until motion is detected. Upon wakening, a report can then be generated,
and the GPS enabled to detect drive events.
2.2 Certification and Safety
Items
Drop Design
Temperature Range
© 2018 M-Labs Technologies
Requirement
1.2meter 6 direction standard drop test
-20 to 65C Operation
-40 to +85° C Storage
批注 [GE2]: To be updated...but do
we really need this detail? Can we
delete this section?
7 / 14
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