CalAmp LMU-5541 Hardware Installation Manual page 4

8 to 32 Volts (running), 9-30 (starting)
Power consumption
< 2mA @ 12VDC (Deep Sleep)
Typical 160mA @ 12VDC (Sleep on Cellular Network)
Typical 270 mA @ 12VDC (continuous transmit)
The following pertains to devices that have a JBUS connector and a 4-pin
LMU power cable (part number 5C888) attached to the LMU.
Caution: Some JBUS vehicles operate on 24VDC. In situations where ignition
and/or power is hard wired to the 4-pin LMU power cable, it is imperative to
have matched voltage levels. Any mismatched voltages can create a problem.
For example do not use 24VDC power from the JBUS simultaneoulsy with 12VDC
from the LMU power cable, or vice versa, as this could damage the board.
3.2 LMU-5541™Connectors
The LMU-5541™ offers 12 connectors to access power, I/O, serial communications and other expansion capabilities. These connectors are:
SIM access SIM Access Slot
Cellular main SMA
External GPS SMA (with tamper monitoring, 3.0v)
External WiFi SMA RP
2X Ethernet10/100 RJ45
USB Host Type A
USB On-The-Go (mini)
Serial (RS232/485) DB-9
Serial 5 Pin Molex (switch power TTL Levels)
Power, Ignition, I/O 4-Pin Molex
I/O connector 22-Pin Molex
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LMU-5541™ Connectors
3.2.1 Power Connector
The LMU-5541™ uses a 4 pin Molex 43045-0402 connector as its power connection. The pin out is as follows:
Pin Signal Name Description 5C888 Color Input or Output
1 VIN Power Red Power / Input
2 GND Ground Black Ground
3 ADC1 Analog to Digital Input 1 Green Input
4 INPUT 0 Input 0 / Ignition Sense – Digital Input White Input
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LMU-5541 Hardware & Installation Guide
LMU-5541™ Header (looking into LMU)
3.2.2 I/O Connector
The LMU-5541™'s features expanded I/O capabilities via its 22-Pin Molex 43045-2202 connector. Its pin-out is as follows:
Pin Signal Name Description 5C889 Color Input or Output
1 Input 1 Input 1 – Digital Input Blue Input
2 Input 2 Input 2 – Digital Input Orange Input
3 Input 3 Input 3 – Digital Input Violet Input
4 Input 4 Input 4 – Digital Input Gray Input
5 Input 5 Input 5 – Digital Input Green & White Input
6 Input 6 Input 6 – Digital Input Blue & White Input
7 Input 7 Input 7 – Digital Input Black & White Input
8 1BB T Data 1 Bit Bus Data (T) Green & Black Input/Output
9 1BB GND 1 Bit Bus Ground Black Ground
10 1 BB R Data 1 Bit Bus Data (R) Orange & Black Input/Output
11 1 BB Gnd 1 Bit Bus Ground Black Ground
12 Output 0 Output 0 - Starter Disable Relay Driver Green Output
13 Output 1 Output 1 - Digital Output Brown Output
14 Output 2 Output 2 - Digital Output Yellow Output
15 Output 3 Output 3 - Digital Output Blue & Orange Output
16 Output 4 Output 4 - Digital Output Green & Black & Orange Output
17 Output 5 - LED Output 5 - LED 1 Driver Red & Green Output
18 Output 6 - LED Output 6 - LED 2 Driver Orange & Green Output
19 ADC 2 Analog to Digital Input 2 Black & Red Input
20 ADC 3 Analog to Digital Input 3 White & Red Input
21 ADC 4 Analog to Digital Input 4 Orange & Red Input
22 ADC 5 Analog to Digital Input 5 Blue & Red Input
LMU-5541™ Header (looking into LMU)
3.2.3 Serial Interface Connectors
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The LMU-5541™ offers 2 serial interface connections (Host/Aux1 and DB-9 SerialAux 2) on its front face. Host/AUX1 is provided via a Molex
43650-0501 connector using the following pin out.
Pin Signal Name Description 134364-SER Color Input or Output
1 VIN_FILT Filtered LMU Power Red Power Supply
2 VCC3V3 3.3V Power Orange Power Supply