Installation Instructions

L508 Hardware Design
Copyright© Shanghai Mobiletek Communication Ltd 8
List of Figures
Figure 1 L508E Functional Block Diagram ........................................................................................... 17
Figure 2 L508LA Functional Block Diagram ......................................................................................... 18
Figure 3 L508LA Functional Block Diagram ......................................................................................... 19
Figure 4 Top, Bottom, Sides Dimensions (Unit: mm) .......................................................................... 23
Figure 5 Recommended Footprint (Unit: mm) ..................................................................................... 24
Figure 6 View of the Module ................................................................................................................... 24
Figure 7 pin configuration (top view) ..................................................................................................... 26
Figure 8 Power interface recommendation circuit ............................................................................... 37
Figure 9 Recommended LDO power supply circuit ............................................................................ 38
Figure 10 Recommended DC/DC power supply circuit ...................................................................... 39
Figure 11 Charging reference circuit ..................................................................................................... 40
Figure 12 SIM Card Signal Connection Circuit .................................................................................... 42
Figure 13 PCM timing .............................................................................................................................. 43
Figure 14 Timing of external CODEC to module ................................................................................. 43
Figure 15 Timing of the external CODEC for the module .................................................................. 44
Figure 16 PCM Application Circuit (L508 module as the main PCB device) ................................... 44
Figure 17 USB application circuit ........................................................................................................... 46
Figure 18 Module serial port and AP application processor full function connection method ...... 48
Figure 19 Module serial port and application processor 4-wire connection .................................... 48
Figure 20 Module serial port and AP application processor 2-wire connection .............................. 49
Figure 21 UART level transition connection diagram ......................................................................... 49
Figure 22 UART to RS232 reference circuit ......................................................................................... 50
Figure 23 SPI connection diagram 1 ..................................................................................................... 51
Figure 24 SPI connection diagram 2 ..................................................................................................... 51
Figure 25 LCD reference design ............................................................................................................ 52
Figure 26 I2C design reference circuit .................................................................................................. 53
Figure 27 NETLIGHT reference circuit ................................................................................................. 54
Figure 28 FLIGHTMODE design schematic ......................................................................................... 55
Figure 29 L508 download reference circuit .......................................................................................... 56
Figure 30 SD card reference design ..................................................................................................... 58
Figure 31 SDIO_WIFI reference design ............................................................................................... 60
Figure 32 SDIO_EMMC reference design ............................................................................................ 61
Figure 33 PCIe reference design ........................................................................................................... 62
Figure 34 RMII Ethernet reference design ........................................................................................... 66
Figure 35 RMII Ethernet reference design ........................................................................................... 66
Figure 37 Electret microphone reference design ................................................................................ 67
Figure 38 Receiver reference design .................................................................................................... 68
Figure 39 External class K amplifier reference design ....................................................................... 68
Figure 40 Power on sequence diagram ................................................................................................ 73
Figure 41 Power-off sequence diagram ................................................................................................ 74
Figure 42 PWRKEY/RESET/EXTON1N reference circuit .................................................................. 75
Figure 43 PWRKEY/RESET reference circuit ...................................................................................... 76