User's Manual
Table Of Contents
- Copyright
- Attention
- Trademark
- Versions
- Foreword
- Product Overview
- Structure
- Hardware Introduction
- Hardware Interface
- Power Interface
- Power on/off and Reset Signal
- Status Indicating Signal
- USB /SSIC Interface
- USIM Interface
- Digital Audio
- Win8/Android Switch Control Interface
- W_DISABLE# Interface
- TX_BLANKING Interface
- WAKEUP_Host Interface
- BODY_SAR Interface
- I2C Interface
- Clock Interface
- Config Interface
- RF Interface
- Other Interfaces
- Electrical and Environmental Features
- RF Interface
L830-EA M.2 Module Hardware User Manual Page
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5 Hardware Interface
5.1 Power Interface
5.1.1 Power Supply
L830-EA M.2 modules require 3.135V ~ 4.4V direct current power supply, which can provide the
maximum GSM emission current of 2A.
Input power supply requirements:
Parameter
Minimum Value
Recommended Value
Maximum Value
Unit
+3.3V
3.135
3.3
4.4
V
Points for attention in design:
1. Supply voltage fluctuation shall be lower than 200mV.
2. Minimum supply voltage drop shall be higher than 3.135V.
The filter capacitor design of power supply circuit as follows:
Recommended
capacitor
Application
Description
330uF
Supply capacitance
Reduce power-supply fluctuation during phone call.
The capacitance value bigger is better
1uF,100nF
Digital signal noise
Filter the interference caused by clock and digital
signals
39pF,33pF
700 /850 /900 MHz
Filter RF interference
18pF,8.2pF,6.8pF
800/1700/1800/1900,
2100/2600MHz
Filter RF interference
5.1.2 VIO_1V8
As the power supply for the digital circuit inside the module, VIO_1V8 can be used as the module`s
reference level of the status index signal and digital signal. Only used for internal circuit.
Parameter
Minimum Value
Recommended Value
Maximum Value
Unit