LMU3641MB-HRZLG-G1000

CalAmp LMU-3641MB — LTE Cat-M1 Advanced Fleet Telematics Gateway with External Cellular & GNSS Antennas

The CalAmp LMU-3641MB is a robust, highly expandable LTE Cat-M1 vehicle telematics gateway designed for advanced fleet management, vehicle diagnostics, commercial fleet tracking, driver monitoring, fleet security, sensor integration, and enterprise telematics applications. It combines LTE Cat-M1 connectivity, high-sensitivity GNSS, integrated light- and heavy-duty vehicle diagnostics, Bluetooth Low Energy 5.0, extensive digital and analog I/O, TTL and RS-232 serial communications, 1-Wire connectivity, programmable PEG™ edge intelligence, and an internal backup battery. (CalAmp)

The defining difference between the LMU-3641MB and LMU-3640MB is the antenna architecture. The LMU-3641MB uses external cellular and GPS antennas, while retaining an internal BLE antenna. This makes the LMU-3641MB especially useful when the telematics unit must be installed in a concealed, shielded, or otherwise RF-challenging location where externally positioned antennas can provide greater installation flexibility. (CalAmp)

Advanced GNSS Vehicle Location

The LMU-3641MB incorporates a 55-channel hybrid GPS/GLONASS/SBAS GNSS engine supporting the WAAS, EGNOS and MSAS satellite-based augmentation systems. CalAmp specifies approximately 2.0-meter CEP open-sky location accuracy under its stated 24-hour static SBAS test conditions. (CalAmp)

GNSS tracking sensitivity is specified at -162 dBm, with acquisition sensitivity of -156 dBm for hot starts and -148 dBm for cold starts. Position updates are supported at rates of up to 4 Hz, and the device is Assisted GPS (AGPS) capable. (CalAmp)

These capabilities make the LMU-3641MB suitable for real-time vehicle location, route history, geofencing, dispatch operations, fleet utilization, theft recovery, driver monitoring and event-driven telematics reporting.

External GPS Antenna

A key feature of the LMU-3641MB is its external GPS/GNSS antenna connection.

CalAmp specifies an external SMA GPS antenna interface, allowing the GNSS antenna to be positioned separately from the telematics gateway. (CalAmp)

This can be advantageous when the LMU-3641MB itself needs to be installed:

• Behind a dashboard

• Inside an equipment enclosure

• Beneath or behind RF-obstructing materials

• In a secure or concealed location

• Where the GNSS antenna requires a different mounting position

The external-antenna architecture gives installers greater control over antenna placement than the internal-antenna LMU-3640MB.

Global LTE Cat-M1 Cellular Connectivity

The LMU-3641MB provides broad LTE Cat-M1 cellular connectivity.

CalAmp specifies LTE Cat-M1 support across:

B1 / B2 / B3 / B4 / B5 / B8 / B12 / B13 / B18 / B19 / B20 / B25 / B26 / B28 / B39. (CalAmp)

The global variant also supports GSM/GPRS 850/900/1800/1900 MHz, providing fallback connectivity where compatible legacy networks remain available.

Supported data communications include:

• SMS

• UDP packet data

• TCP (CalAmp)

External Cellular Antenna

The LMU-3641MB also uses an external cellular antenna, with CalAmp specifying an SMC cellular antenna interface. The BLE antenna remains internal. (CalAmp)

Separating the cellular antenna from the gateway can provide significant installation flexibility in applications where the telematics hardware must be mounted away from the most favorable RF location.

This external cellular and GNSS antenna architecture is the principal physical distinction between the LMU-3641MB and its internal-antenna LMU-3640MB counterpart.

Integrated Light-Duty Vehicle Diagnostics

The LMU-3641MB incorporates extensive built-in support for light-duty vehicle diagnostic and communications protocols.

Supported interfaces include:

• J1850 PWM

• J1850 VPW

• SW-CAN

• ISO 9141-2

• KWP2000

• ISO 15765 CAN (CalAmp)

This gives compatible fleet applications access to vehicle operating and diagnostic information without requiring the LMU-3641MB to function solely as a location-reporting device.

The platform includes a dedicated 16-pin, 3 mm-pitch vehicle BUS interface in addition to its separate 24-pin power and general-purpose I/O connector. (CalAmp)

Heavy-Duty J1939 & J1708 Support

The LMU-3641MB also supports the SAE J1939 and J1708 heavy-duty vehicle-data standards. (CalAmp)

This expands its usefulness beyond passenger and light-commercial vehicles to compatible commercial trucks, vocational vehicles, buses and other heavy-duty platforms.

For organizations operating mixed fleets, support for both light-duty and heavy-duty vehicle protocols can allow a common telematics platform to address a much broader range of vehicle types.

Comprehensive 24-Pin Vehicle I/O

The LMU-3641MB provides extensive general-purpose vehicle connectivity through a 24-pin, 3 mm-pitch power and I/O connector. (CalAmp)

The interface provides:

• 1 fixed-bias ignition input

• 4 configurable digital inputs

• 3 digital outputs

• 2 external ADC analog inputs

• 2 serial interfaces

• 1 1-Wire® interface

• 1 switched VIN output

• 2 switched 3.3 V outputs (CalAmp)

The four digital inputs are selectable for high- or low-bias operation over 0–30 VDC, while the three digital outputs use 150 mA open-collector relay drivers. (CalAmp)

This extensive I/O capability allows appropriately engineered installations to integrate the LMU-3641MB with vehicle circuits, sensors, switches, relays, alarms and specialized fleet equipment.

Dual Serial Interfaces — TTL & RS-232

The LMU-3641MB provides two serial communications interfaces:

• 1 TTL serial interface

• 1 RS-232 serial interface (CalAmp)

Serial communications are particularly useful in specialized telematics applications involving third-party peripherals, legacy fleet equipment and other devices that need to exchange information directly with the telematics gateway.

The inclusion of both TTL and conventional RS-232 interfaces gives system integrators greater flexibility when incorporating external hardware.

1-Wire® Driver Identification & Temperature Sensing

The LMU-3641MB includes a dedicated 1-Wire® interface, which CalAmp identifies for applications including:

• Driver identification

• Temperature sensing (CalAmp)

Driver identification can allow fleet systems to associate vehicle operation with individual drivers, while temperature sensing can support specialized cargo, service, environmental and equipment-monitoring applications.

Bluetooth Low Energy 5.0

The LMU-3641MB is Bluetooth Low Energy 5.0 capable and uses an internally integrated BLE antenna. (CalAmp)

CalAmp positions the device as part of a gateway-and-tag ecosystem, allowing purpose-built tags and sensors to be integrated for applications such as monitoring the location of cargo while in transit. (CalAmp)

BLE provides an additional wireless expansion path beyond the gateway's extensive wired I/O, serial, vehicle-bus and 1-Wire interfaces.

Advanced Driver Behavior & Motion Detection

An integrated three-axis accelerometer provides onboard motion sensing for:

• Driver-behavior monitoring

• Impact detection

• Motion sensing

• Tilt detection (CalAmp)

CalAmp specifically highlights driver-monitoring applications involving speeding, accident detection, extreme braking and cornering. (CalAmp)

When motion data is combined with GNSS location and vehicle diagnostics, fleet-management applications can obtain significantly more operational context than GPS location alone can provide.

Integrated Programmable Buzzer

The LMU-3641MB incorporates a programmable audible buzzer. (CalAmp)

This allows appropriately configured applications to provide audible alerts directly within the vehicle. Such alerts can be incorporated into driver-facing workflows where immediate feedback is useful.

The programmable buzzer further differentiates the LMU-3641MB from basic passive GPS trackers by providing a local mechanism for interacting with the vehicle operator.

Remote Safety Lockout & Vehicle Security

CalAmp identifies remote safety lockout as a capability of the LMU-3641MB platform, including support for disabling vehicles or equipment and remotely enabling theft detection and stolen-vehicle recovery. (CalAmp)

When incorporated into an appropriately engineered installation, the gateway's programmable outputs can become part of a broader vehicle-security system.

Combined with GNSS tracking, ignition monitoring, motion detection, vehicle diagnostics and backup power, the LMU-3641MB can provide a comprehensive foundation for fleet-security applications.

Any immobilization functionality should be professionally designed for the specific vehicle and implemented with appropriate safety and operational controls.

PEG™ Programmable Edge Intelligence

The LMU-3641MB incorporates CalAmp PEG™ edge intelligence, allowing device functionality to be updated and new edge applications to be developed. (CalAmp)

Edge processing enables supported events and business rules to be evaluated locally rather than requiring every decision to be made by a remote cloud platform.

Application logic can incorporate information from sources such as GNSS position, ignition state, vehicle diagnostics, digital and analog I/O, accelerometer events, serial peripherals and 1-Wire devices.

This can reduce unnecessary cellular communications while allowing important events to be detected and reported rapidly.

Internal Backup Battery

The LMU-3641MB supports an internal Lithium-Ion backup battery with capacity up to 1000 mAh. CalAmp describes this battery as providing additional assurance against interference or primary-power loss. (CalAmp)

CalAmp specifies:

• Battery technology: Lithium-Ion

• Capacity: up to 1000 mAh

• Charging temperature: 0°C to +45°C (CalAmp)

Backup power is especially valuable for vehicle-security and stolen-vehicle-recovery applications because the tracker can retain power for a period after primary vehicle power has been disconnected.

Low-Power Vehicle Operation

The LMU-3641MB provides multiple power-management states designed to reduce its effect on the host vehicle battery.

CalAmp specifies typical consumption of:

• 600 µA at 12 V — deep sleep

• 15 mA at 12 V — radio-active sleep

• 90 mA at 12 V — active tracking with GPS and cellular enabled (CalAmp)

Deep-sleep operation is particularly valuable for fleet vehicles that may remain parked for extended periods.

12/24-Volt Vehicle Electrical Architecture

The LMU-3641MB supports both 12 V and 24 VDC vehicle electrical systems.

CalAmp specifies:

• 9–30 VDC during startup and normal operation

• 7–32 VDC for momentary operation (CalAmp)

This broad electrical range allows the gateway to address passenger vehicles as well as many commercial and heavy-duty fleet applications.

Flexible Installation Options

CalAmp identifies multiple installation approaches for the LMU-3641MB:

• Hardwired installation

• OBD-II installation with an optional adapter

• Cigarette-lighter power harness (CalAmp)

This allows fleet operators and system integrators to use the same underlying telematics platform across different installation environments.

The external antenna design adds another level of flexibility by allowing cellular and GNSS antennas to be positioned independently from the gateway itself.

Physical Design

The LMU-3641MB measures approximately:

5.7 × 2.1 × 1.3 inches
145 × 53 × 33 mm

CalAmp specifies a weight of approximately:

5 oz / 142 g with the 1000 mAh battery. (CalAmp)

Physical interfaces include:

• 16-pin, 3 mm-pitch vehicle BUS connector

• 24-pin, 3 mm-pitch power/I/O connector

• External SMC cellular antenna connection

• External SMA GPS antenna connection

• Internal 2FF SIM (CalAmp)

This configuration reflects the LMU-3641MB's role as a full vehicle-data and telematics gateway rather than a basic location tracker.

Integrated Status Indicators

Four status LEDs provide visual diagnostic information for:

• GPS

• Cellular

• VBUS

• LAN (CalAmp)

These indicators can assist technicians during installation, commissioning and troubleshooting.

Fleet-Grade Environmental Design

The LMU-3641MB is designed for professional vehicle telematics environments.

CalAmp specifies:

• -30°C to +60°C when connected to primary power

• -10°C to +60°C while operating from the internal battery

• -20°C to +25°C for up to six months for long-term storage with battery

• 85% RH at 50°C, non-condensing (CalAmp)

Shock and vibration performance references U.S. Military Standard 202G, while ESD testing is specified to IEC 61000-4-2 at 4 kV. Automotive load-dump protection references SAE J1455. (CalAmp)

CalAmp iOn Remote Device Management

The LMU-3641MB supports CalAmp iOn, which CalAmp specifies for remotely:

• Monitoring devices

• Managing devices

• Upgrading firmware

• Configuring devices

• Troubleshooting deployed devices (CalAmp)

This can substantially simplify administration of geographically distributed fleet deployments by reducing the need to physically access individual telematics devices for routine management.

CalAmp notes that these software capabilities require an applicable subscription service. (CalAmp)

CalAmp Telematics Cloud & RESTful API Integration

The LMU-3641MB also supports CalAmp Telematics Cloud, with CalAmp specifying device-data streaming through RESTful APIs. (CalAmp)

This enables LMU-3641MB information to be integrated into proprietary fleet-management platforms, enterprise systems, analytics applications, reporting engines and third-party services.

For solution providers, this API architecture allows the LMU-3641MB to function as part of a broader custom telematics solution rather than being tied exclusively to a single end-user application.

Regulatory & Industry Certifications

CalAmp lists the LMU-3641MB with:

• FCC

• IC

• CE

• PTCRB

• RoHS

• Bluetooth SIG

• RCM (CalAmp)

Carrier and certification requirements should still be confirmed against the exact regional SKU and intended network before deployment.

Key Technical Features

• LTE Cat-M1 cellular connectivity

• LTE bands B1/B2/B3/B4/B5/B8/B12/B13/B18/B19/B20/B25/B26/B28/B39

• GSM/GPRS 850/900/1800/1900 MHz

• SMS, UDP packet data and TCP communications

• 55-channel hybrid GPS/GLONASS/SBAS receiver

• WAAS, EGNOS and MSAS augmentation

• Approximately 2.0 m CEP open-sky positioning accuracy

• -162 dBm GNSS tracking sensitivity

• -156 dBm hot-start acquisition sensitivity

• -148 dBm cold-start acquisition sensitivity

• Up to 4 Hz location updates

• Assisted GPS capability

• External cellular antenna — SMC

• External GPS antenna — SMA

• Internal BLE antenna

• Bluetooth Low Energy 5.0

• Integrated light-duty vehicle diagnostics

• J1850 PWM

• J1850 VPW

• SW-CAN

• ISO 9141-2

• KWP2000

• ISO 15765 CAN

• Heavy-duty J1939

• Heavy-duty J1708

• One fixed-bias ignition input

• Four configurable 0–30 VDC digital inputs

• Three 150 mA open-collector outputs

• Two external ADC analog inputs

• One TTL serial interface

• One RS-232 serial interface

• One 1-Wire® interface

• One switched VIN output

• Two switched 3.3 V outputs

• Integrated three-axis accelerometer

• Driver-behavior monitoring

• Impact detection

• Motion sensing

• Tilt detection

• Programmable audible buzzer

• Remote safety-lockout support for appropriately engineered installations

• PEG™ programmable edge intelligence

• Internal Lithium-Ion battery up to 1000 mAh

• Typical deep-sleep consumption of approximately 600 µA at 12 V

• 12/24 VDC vehicle-system compatibility

• 9–30 VDC startup/operating range

• 7–32 VDC momentary range

• 16-pin vehicle BUS interface

• 24-pin power/I/O interface

• Internal 2FF SIM

• Four GPS/cellular/VBUS/LAN status LEDs

• Dimensions: 145 × 53 × 33 mm

• Weight: 142 g / 5 oz with 1000 mAh battery

• Primary-power operating temperature: -30°C to +60°C

• CalAmp iOn remote management

• CalAmp Telematics Cloud

• RESTful API device-data streaming

• FCC, IC, CE, PTCRB, RoHS, BT SIG and RCM certifications (CalAmp)

LMU-3641MB vs. LMU-3640MB

The LMU-3641MB and LMU-3640MB share essentially the same core telematics architecture, including LTE Cat-M1, GPS/GLONASS/SBAS, vehicle diagnostics, J1939/J1708, BLE 5.0, extensive I/O, serial interfaces, accelerometer, PEG edge intelligence and backup-battery support. The important installation distinction is the antenna configuration: LMU-3641MB uses external cellular and GPS antennas, while LMU-3640MB is the internal-antenna version. (CalAmp)

For your DCS Shopify catalog, that distinction is worth making prominent because customers choosing between these two models are likely doing so primarily based on antenna placement and installation requirements, rather than a fundamentally different telematics feature set.

Ideal Applications

The CalAmp LMU-3641MB is particularly well suited for commercial fleet tracking, passenger and commercial vehicles, medium- and heavy-duty fleets, service vehicles, mixed fleets, vehicle diagnostics, driver-behavior monitoring, vehicle security, stolen-vehicle recovery, cargo monitoring, sensor integration, temperature monitoring, driver identification and custom enterprise telematics deployments. CalAmp categorizes the device across passenger/commercial vehicles, industrial equipment, smart trailers, advanced asset monitoring, and driver/passenger safety applications. (CalAmp)

Its combination of external cellular and GNSS antennas, LTE Cat-M1 connectivity, high-sensitivity GNSS, integrated light- and heavy-duty diagnostics, J1939/J1708, extensive I/O, TTL and RS-232 serial communications, 1-Wire, BLE 5.0, three-axis motion sensing, programmable buzzer, PEG edge intelligence and up to a 1000 mAh backup battery makes the LMU-3641MB particularly appropriate where a sophisticated vehicle-data gateway is required and external antenna placement is advantageous or necessary. (CalAmp)

CalAmp LMU-3641MB — Official Product Specifications

 

SKU DESCRIPTION: LMU3640, LTE, E-GPS, CAT M, BLE, 1000 MAH BATT, RS232, BUZZER, LOAD DUMP, EXT ANT, GEN-HW