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MAX-7_NEO-7_LEA-7_HardwareIntegrationManual_(GPS.G7-HW-11006)

1682169 2014-06-09 | pdf | 2306KB | 次下载 | 1积分

资料介绍

Contents

Preface ................................................................................................................................ 3

Contents .............................................................................................................................. 5

1 Quick reference ............................................................................................................ 8

2 Hardware description .................................................................................................. 8

2.1 Overview ................................................................................................................................................................................. 8

2.2 Architecture .............................................................................................................................................................................8

2.3 Operating modes .....................................................................................................................................................................9

2.3.1 Continuous Mode ................................................................................................................................................................9

2.3.2 Power Save Mode ................................................................................................................................................................9

2.4 Configuration ..........................................................................................................................................................................9

2.5 Connecting power ...................................................................................................................................................................9

2.5.1 VCC: Main Supply Voltage ................................................................................................................................................... 9

2.5.2 VCC_IO: IO Supply Voltage (MAX-7)................................................................................................................................... 10

2.5.3 V_BCKP: Backup Supply Voltage ........................................................................................................................................ 10

2.5.4 VDD_USB: USB interface power supply (NEO-7/LEA-7) ......................................................................................................... 10

2.5.5 VCC_RF: Output Voltage RF section.................................................................................................................................... 10

2.5.6 V_ANT: Antenna supply (NEO-7/LEA-7) ............................................................................................................................... 11

2.6 Interfaces ...............................................................................................................................................................................11

2.6.1 UART ................................................................................................................................................................................11

2.6.2 USB ...................................................................................................................................................................................11

2.6.3 Display Data Channel (DDC) ...............................................................................................................................................13

2.6.4 SPI (NEO-7) ........................................................................................................................................................................ 13

2.7 I/O pins ..................................................................................................................................................................................13

2.7.1 RESET_N: Reset input ......................................................................................................................................................... 13

2.7.2 EXTINT: External interrupt .................................................................................................................................................. 13

2.7.3 D_SEL: Interface select (NEO-7)...........................................................................................................................................14

2.7.4 TX-ready signal ..................................................................................................................................................................14

2.7.5 ANT_ON: Antenna ON (LNA enable) (NEO-7N, MAX-7Q, MAX-7C) ...................................................................................... 14

2.7.6 Antenna Short circuit detection (LEA-7N, MAX-7W) ............................................................................................................ 14

2.7.7 Antenna open circuit detection ..........................................................................................................................................14

2.7.8 TIMEPULSE ........................................................................................................................................................................ 14

3 Design ......................................................................................................................... 15

3.1 Design checklist ..................................................................................................................................................................... 15

3.1.1 Schematic checklist ............................................................................................................................................................15

3.1.2 Layout checklist ................................................................................................................................................................. 16

3.1.3 Antenna checklist ..............................................................................................................................................................16

3.2 Design considerations for minimal designs ..............................................................................................................................16

3.2.1 Minimal design (NEO-7N) ...................................................................................................................................................17

3.2.2 Minimal design (MAX-7Q) .................................................................................................................................................. 19

3.2.3 Minimal design (LEA-7N) .................................................................................................................................................... 20

3.3 Layout ...................................................................................................................................................................................21

3.3.1 Footprint and paste mask ...................................................................................................................................................21

3.3.2 Placement ......................................................................................................................................................................... 22

3.3.3 Antenna connection and ground plane design .................................................................................................................... 23