Installation Instructions
Table Of Contents
- Contents
- List of Table
- List of Figures
- 1 About this document
- 2 Product Overview
- 3 Mechanical Dimensions
- 4 Interface description
- 4.1 Pin Definition
- 4.2 Operating conditions
- 4.3 Digital logic characteristics
- 4.4 Power interface
- 4.5 USIM card interface
- 4.6 PCM interface
- 4.7 USB2.0 interface
- 4.8 UART interface
- 4.9 SPI interface
- 4.10 I2C interface
- 4.11 Network light
- 4.12 System Status Indication
- 4.13 Flight Mode
- 4.14 Forced USB download interface
- 4.15 SD card interface
- 4.16 SDIO_WIFI/EMMC interface
- 4.17 PCIe interface
- 4.18 RMII/RGMII interface
- 4.19 AUDIO interface
- 4.20 ADC
- 4.21 GPIOs
- 4.22 Power on/off and reset interface
- 4.23 Antenna interface
- 5 Product characteristics
- 6 Design Guideline
- 7 Storage, Production and Package
- 8 Safety Information
- 空白页面
- 空白页面
L508 Hardware Design
Copyright© Shanghai Mobiletek Communication Ltd 45
2, the master clock of the PCM chip needs to be supplied by the External Crystal Oscillator, the
specific design requirements can be obtained from our marketing department related documents.
3.NAU8814 is the default support for L508 as the PCM decoder chip. See L508 reference
design for more details
4.7 USB2.0 interface
4.7.1 Pin Description
The product has a high-speed USB2.0 interface, supporting low-speed, full-speed and high-speed
mode, the main processor (AP) and the module between the main USB interface for data
transmission. The interface definition of USB is given in Table 19.
Table 18 USB interface definitions
Pin No. Pin Name Functional description
DC Characteristics (V)
Min Typ Max
11 USB_VBUS USB Power input 3.5V 5V 5.5V
12 USB_DN USB high-speed data - minus - - -
13 USB_DP USB high-speed data - plus - - -
16 USB_ID USB high-speed data - ID -- 1.8V --
4.7.2 USB interface application
USB Bus is mainly used for data transmission, software upgrade, module program detection. If the
USB circuit works in high speed mode, if the ESD design is needed, the junction capacitance value of
ESD Protection Device<2PF must be satisfied, otherwise the large junction capacitance will cause
waveform distortion and affect the bus communication. The differential impedance of the differential
data line should be controlled at 90ohm±10%. The application is illustrated in the following figure: