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 39
better transient current response, meet the working requirement of the module under the weak signal
of 2G, and prevent the network drop or port restart caused by power shortage.
LM2596-ADJ
IN
EN
GND
FB
OUT
DC_IN
MCU_GPIO
100uF 1uF
2.2K
1K
VBAT
330uF
100nF
100uH
MB R3 60
Figure 10 Recommended DC/DC power supply circuit
4.4.4 Charging circuit design reference
The module has reserved the charging interface. If you want to realize the charging function, you can
refer to the following charging circuit
Table 15 Charging interface definition
Pin No. Pin Name I/O Functional description
11 USB_VBUS PI USB power detect
15 VDD1V8 PO LDO for I/O
45 GPIO_20 B_PD Charging chip enable, active low
46 ADC2 AI Battery NTC temperature detection
47 ADC1 AI Battery voltage detection
84 GPIO_05 B_PU Charging state detection
86 EXTON1N AI Charging startup detection, charging module startup