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 49
Figure 20 Module serial port and AP application processor 2-wire connection
Module interface level is 1.8 v, if the AP interface level does not match, it is recommended to add level
conversion circuit.
CTS
RXD
TXD
RTS
MODULE
Third party
UART devices
CTS
RXD
TXD
RTS
A4
A2
A1
A3
B4
B2
B1
B3
VCCA
OE
VCCB
GND
L11_1V
8
100NF
LDO_3.3V
Figure 21 UART level transition connection diagram
When the module communicates with PC, the RS232 level conversion circuit needs to be added
between the module and PC because its serial port is 1.8V CMOS level. Recommended customers to
use SN65C3238, for the application of the chip see chip specifications. The customer needs to
ensure that the level converter chip is connected to the module with an i/o voltage of 1.8 v.
CTS
RXD
TXD
RTS
MODULE
A4
A2
A1
A3
B4
B2
B1
B3
VCCA
OE
VCCB
GND
L11_1V8
100NF
LDO_3.3V
VCC
DIN1
DIN2
DIN3
DIN4
DIN5
R1OUTB
ROUT1
ROUT2
ROUT3
FORCEON
/FORCEOFF
LDO_3.3V
DOUT1
DOUT2
DOUT3
DOUT4
DOUT5
RIN1
RIN2
RIN3
/INVALID
CTS
RXD
TXD
RTS
GND
GND
DB9
SN65C3238
TXS0104EPWR