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 46
VUSB
GND
GND
USB_DM
USB_VBUS
USB_DP
MODULE
D1
D2
ESD
ESD
ESD
USB_DM
USB_DP
1
2
3
5
D3 D4
ESD
USB_ID
Figure 17 USB application circuit
4.8 UART interface
4.8.1 Pin Description
The L508 module provides 2 serial communication interfaces, UART as a complete asynchronous
communication interface, supports the signal control of Standard Modem handshake signal, and
accords with RS-232 interface protocol, also support 4-wire serial bus interface or 2-wire serial bus
interface mode, the module can be UART interface for serial communication and AT instruction input,
etc.
These UART ports support programmable data widths, programmable data stop bits, programmable
parity bit, have separate TX and RX FIFOs. The depth of the TX FIFO is 64 bytes and the width is
8bits.The RX FIFO has a depth of 64 bytes and a width of 11bits
Pin Signal definitions are shown in the following table.
Table 19 UART interface definitions
Pin No. Pin Name I / O type Functional description