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 56
Table 27 Forced download interface definitions
Pin No. Pin Name I / O type Functional description
85 DL_KEY DI
Connect DL_KEY to VDD1V8 before boot on,
then the system will enter USB forced download
mode
4.14.2 Forced USB download interface application
MODULE
DL_KEY
VDD1V8
1K
Figure 29 L508 download reference circuit
4.15 SD card interface
4.15.1 Pin Description
The module supports SD card with 4-bit data interface, or devices based on SDIO protocol. SD
interface level can be adjusted at 1.8/3.0V.
Table 28 SD card interface definitions
Pin No. Pin Name I / O type Functional description