9/27/2017
LMU-3640 Hardware & Installation Guide - PULS Wiki
https://puls.calamp.com/wiki/LMU-3640_Hardware_%26_Installation_Guide
9/23
Accuracy: 2 meter CEP (with SBAS)
Tracking Sensitivity: -162dBm
Acquisition Sensitivity: -148dBm
3.4
I/O Descriptions
The LMU-3640™ provides the following inputs and outputs (I/O):
Digital Inputs
Input 0: Ignition Sense (Always biased low)
Input 1: In-1 sel
Input 2: In-2 sel
Input 3: In-3 sel
Input 4: In-4 sel
Internal Inputs
Input 8: Motion Sensor
Input 9: VBUS Active
Input 10: Pwr State
Input 11: Vbatt Low
Input 12: 1BB Detect
Input 13: Batt Virt Ign
Input 14: Pure Virt Ign
Input 15: Radio Wing Wake
Input 16: DB Wake
Input 17: Vbus Wake
Input 18: Pwr State 2
Input 19: Crank Detect
Analog to Digital Inputs
A/D 0: External Power Supply Monitor (VIN1)
A/D 1: Ext ADC1
A/D 2: EXT ADC2
A/D 3: HW Config
A/D 4: VIN2
A/D 5: VIN_VBUS
A/D 6: GPS Antenna Monitor
A/D 7: µP Temperature
A/D 8: Vref
A/D 9: Battery
Outputs:
Output 0: Out-0
Output 1: Out-1
Output 2: Out-2
Internal Outputs
Output 7: Pwr Switch
Output 8: Chrg Disable
Output 13: 12Vout Enable
3.4.1
3-Axis Accelerometer Input
The LMU-3640™ supports an internal 3 Axis Precision Accelerometer as one of its discreet inputs. When the LMU is moved in any direction, the
associated input will be in the High state. If the LMU’s accelerometer does not detect motion, then the input will be in the Low state. No external
connections are required for this functionality to be operational.
3.4.2
Ignition and Inputs
The LMU-3640™ provides up to 7 inputs. These inputs are protected from typical vehicle transients and can be directly connected to most vehicle
level logical inputs from 4 volts up to the vehicle power input level (typically 12 VDC). Their input impedance is approximately 10kO. One of
these inputs is dedicated to sensing the vehicle’s ignition status to provide for flexible power management. The other two inputs may be used to
sense vehicle inputs such as cooling unit operation, a hidden driver “Panic” switch, taxi on-duty/off-duty meter status or many others.
