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 53
DEVICES
SCL
GND
GND
SCL
SDA
MODULE
SDA
Figure 26 I2C design reference circuit
Note: 1. Special software versions are required to support access to I2C.
2. L508 I2C only supports the HOST mode.
4.11 Network light
4.11.1 Pin Description
Table 23 NETLIGHT
Pin No. Pin Name I / O type Functional description
51 NETLIGHT DO Network indicator switch control
4.11.2 Interface application
The L508 module has a pin to control the LED display and can be used as an indicator of network
connection status. A status light indicates that different patterns of flashing indicate different network
states. The pin uses a GPIO, with an external NPN transistor and an External VBAT to drive the LED
directly. Drive current capability varies depending on the external NPN type. DTC143ZEBTL is
recommended with a maximum drive current of 100 ma， Figure 4-22 is a reference circuit diagram.
The state of the indicator light can be designed and controlled by the host computer through
instructions.