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 74
PWRK EY
UART
T
OFF
T
UART
Not availableavailable
T
STATUS
STATUS
Figure 40 Power-off sequence diagram
Note: the Status Pin can be used to determine whether the power is on, and when the module is
powered up and initialized, the STATUS output is high, otherwise it remains low.
4.22.4 Reset sequence
L508 can reset the module by pulling down the RESET or PWRKEY pin. Refer to 4.22.1 for a
description of restarting the module.
Table 40 electrical properties of reset key signals
Symbols Pin Name Min Typ Max Unit
VIH Reset pin input high level voltage 1.26 1.8 2.0 V
VIL Reset pin input low level voltage -0.3 0 0.54 V
Note: It is recommended to use the RESET pin only in emergency situations, such as when the
module is not responding. In addition, the RESET pin is not valid when the module is turned off.
4.22.5 Interface application
PWRKEY, EXTON1N and RESET circuit can refer to the following diagram of the design circuit.