2007-11-19
Page 4 of 35
IT321_Tech_doc_12
CONTENTS
1. GENERAL DESCRIPTION .............................................................................. 7
1.1 Block diagram ...................................................................................... 8
1.2 Frequency Plan .................................................................................... 8
2. SPECIFICATIONS........................................................................................... 9
2.1 General ................................................................................................. 9
2.2 Absolute maximum ratings................................................................ 10
3. OPERATION ................................................................................................. 11
3.1 Operating modes................................................................................ 11
3.2 Normal mode ...................................................................................... 11
3.2.1 Output configuration ................................................................ 11
3.2.2 Power management system modes ......................................... 12
3.3 Hibernate mode .................................................................................. 13
3.4 Programming mode............................................................................ 13
3.5 Procedure for re-programming the flash firmware .......................... 14
4. CONNECTIVITY ............................................................................................ 16
4.1 Connection assignments................................................................... 16
4.2 Power supply...................................................................................... 18
4.3 Configuration select: GPIO 6 & 2 ...................................................... 18
4.4 Boot Control inputs ........................................................................... 18
4.5 ON_OFF control input........................................................................ 19
4.6 Antenna input..................................................................................... 20
4.6.1 Active GPS antenna................................................................. 21
4.7 UART................................................................................................... 21
4.8 PPS ..................................................................................................... 21
4.9 ELCK ................................................................................................... 21
4.9.1 GPIO1 Valid fix indicator.......................................................... 22
4.9.2 TSYNC/GPIO8......................................................................... 22
4.10 Mechanical dimensions and contact numbering.............................. 22
4.11 Suggested pad layout and pin out .................................................... 23
5. MANUFACTURING ....................................................................................... 24
5.1 Assembly ............................................................................................ 24
5.2 Suggested Reflow soldering profile.................................................. 24
5.3 Moisture sensitivity............................................................................ 24
