Specifications

Rev 1.0 1/27/14 9
List of Tables
Table 1.! Power Supply Electrical Characteristics ................................................... 13!
Table 2.! Power Supply Connector Pin Description ................................................. 16!
Table 3.! GPIO Pin Description ................................................................................ 17!
Table 4.! GPIO Pin Operating Conditions when Vref is at 2.8V ............................... 17!
Table 5.! GPIO Pin Operating Conditions when Vref > 2.8V ................................... 18!
Table 6.! ON/OFF Pin Operation ............................................................................. 21!
Table 7.! ON/OFF Pin Description ........................................................................... 21!
Table 8.! Serial Connector Pin Description .............................................................. 22!
Table 9.! Microphone Pin Description for USR3500 ................................................ 26!
Table 10.! Equivalent Circuits of CMIC ..................................................................... 26!
Table 11.! Electrical Characteristics of CMIC for USR3500 ..................................... 26!
Table 12.! Recommended Microphone Characteristics ............................................ 27!
Table 13.! Speaker Outputs Pin Description for USR3500 ....................................... 27!
Table 14.! Electrical Characteristics of CSPK for USR3500 ..................................... 28!
Table 15.! Recommended Speaker Characteristics ................................................. 28!
Table 16.! Mini-B USB Pin Description ..................................................................... 29!
Table 17.! USB Electrical Characteristics for USR3500 ........................................... 29!
Table 18.! SIM Socket Pin Description ..................................................................... 31!
Table 19.! Available RF Interfaces ........................................................................... 31!
Table 20.! Main Receiver Parameters for USR3500 ................................................ 32!
Table 21.! Main Transmitter Parameters for USR3500 ............................................ 32!
Table 22.! Antenna Specifications for USR3500 ...................................................... 33!
Table 23.! GPS Antenna Specifications for USR3500 .............................................. 34!
Table 24.! Alarm Mode (Low Power Mode) .............................................................. 37!
Table 25.! USR3500 Reset Status ........................................................................... 38!
Table 26.! Reset Electrical Characteristics for USR3500 ......................................... 38!
Table 27.! Reset Operating Conditions .................................................................... 38!
Table 28.! USR3500 LED Status .............................................................................. 39!
Table 29.! Real Time Clock Specifications ............................................................... 40!
Table 30.! Available Interrupt Pins on the USR3500 ................................................ 40!
Table 31.! Initial Power Consumption (Typical) ........................................................ 42!
Table 32.! USR3500 Operating Modes .................................................................... 42!