User's Manual

1/28/2015 LMU42x0Hardware&InstallationGuidePULSWiki
https://puls.calamp.com/wiki/LMU42x0_Hardware_%26_Installation_Guide 14/47
3.3.3ExpansionPort
TheLMU42x0™’sfeaturesexpandedI/Ocapabilitiesviaits16PinMolex430451600connector.Itspinout
isasfollows:
Pin
Signal
Name
Description
Inputor
Output
1 SPKR_ ModemSpeakerOutput() AudioOutput
2 SPKR+ ModemSpeakerOutput(+) AudioOutput
3 V_BATT PowerInput(12Voltnominal)forBatteryBackup Input
4 VIN_FILT FilteredVehiclePower(12V) Output
5 I2C_SDI I2CBusDataIn Input
6 I2C_CLK I2CBusClock Output
7 MDM_RXD
ModemSerialInterfaceRcvDatatoMDTorother
peripheral(TTL)
Output
8 HOST_RXD
HostPortSerialInterfaceRcvDatatoMDTorother
peripheral(TTL)
Output
9 MIC ModemMicrophoneInput() AudioInput
10 MIC+ ModemMicrophoneInput(+) AudioInput
11 GND Ground Ground
12 EXT_INT ExternalInterrupt,activelow Input
13 3.3VDC Forpoweringperipheraldevices(500mA) Output
14 I2C_SDO I2CBusDataOut Output
15 MDM_TXD
ModemSerialInterfaceTxDatafromMDTorother
peripheral(TTL)
Input
16 HOST_TXD
HostPortSerialInterfaceTxDatafromMDTorother
peripheral(TTL)
Input
LMU42x0™ExpansionPort(lookingintoLMU)