L811-EA Series Module Hardware User Manual Version：V1.0.2 Date：2015.09.
Copyright Copyright ©2015 Fibocom Wireless Inc . All rights reserved. Without the prior written permission of the copyright holder, any company or individual is prohibited to excerpt, copy any part of or the entire document, or transmit the document in any form. Attention The document is subject to update from time to time owing to the product version upgrade or other reasons. Unless otherwise specified, the document only serves as the user guide.
Applicable Model List No. Type 1 L811-EA Note The supported frequency bands of L811-EA wireless modules as shown in the following tables: Model No.
Content 1 Foreword.................................................................................................................................................................... 6 1.1 Introduction.....................................................................................................................................................6 1.2 Reference Standard......................................................................................................................................
.4.2 W_DISABLE# Signal.......................................................................................................................31 5.4.3 Android & Linux / Win8 & Win10 Dual Systems Switch Control Signal................................. 31 5.5 USB Interface...............................................................................................................................................32 5.5.1 USB Interface Definition..................................................................
1 Foreword 1.1 Introduction The document describes the electrical characteristics, RF performance, dimensions and application environment, etc. of L811-EA wireless modules. With the assistance of the document and other instructions, developers can quickly understand the performance of L811-EA wireless modules and develop products. 1.2 Reference Standard The design of the product complies with the following standards ： 3GPP TS 27.007 -v6.9.0: AT command set for User Equipment (UE) 3GPP TS 27.005 -v6.
3GPP TS 23.090 -v6.1.0: Unstructured Supplementary Service Data (USSD); Stage 2 3GPP TS 24.008 v6.19, Mobile radio interface Layer 3 specification; 3GPP TS 25.101 V7.18.0: User Equipment (UE) radio transmission and reception (FDD) 3GPP TS 36.101V9.18.0: User Equipment (UE) radio transmission and reception 3GPP TS 36.104V9.13.0: Base Station (BS) radio transmission and reception 3GPP TS 36.106V9.4.0: FDD Repeater radio transmission and reception 3GPP TS 36.113V9.5.
2 Product Overview 2.1 Description The L811-EA modules are highly integrated wireless communication LTE modules, which support three modes and twelve bands, including the 4G/3G/2G mainstream modes (LTE FDD/WCDMA/GSM) for Europe and North America and cover a wide range of frequency bands. The modules support the cellular communication networks of Europe, North America as well as the mobile operators in some regions of Asia. 2.
Performance Operating Voltage Voltage: 3.3V ~ 4.4V Normal: 3.8V 4mA (Sleep Mode) Current Consumption (Typical Value) LTE FDD DATA：700mA WCDMA Talk：570mA 2G Talk：250mA (GSM PCL5) Interfaces RF Interface Antenna：Main x1，Diversity x1 USB 2.
FIBOCOM proprietary AT commands AT Commands GSM 07.05 GSM 07.07 Firmware Loader Tool over USB/UART Accessories User Manual Developer Kit Note: 1. Please make sure the temperature for device will not be higher than 85˚C. 2. The minimum distance between the user and/or any bystander and the radiating structure of the transmitter is 20cm. 3.
Note: Federal Communications Commission (FCC) Declaration of Conformity This device complies with part 15 of the FCC Rules. Operation is subject to the following two conditions: (1) This device may not cause harmful interference, and (2) this device must accept any interference received, including interference that may cause undesired operation. This device has been tested and found to comply with the limits for a Class B digital , pursuant to Part 15 of the FCC Rules.
compliance requirement of the end product, which integrates this module. 20cm minimum distance has to be able to be maintained between the antenna and the users for the host this module is integrated into. Under such configuration, the FCC radiation exposure limits set forth for an population/uncontrolled environment can be satisfied. Any changes or modifications not expressly approved by the manufacturer could void the user's authority to operate this equipment.
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3 Structure 3.
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Figure 3- 3 Structure Diagram of PCB Layout L811-EA Module Hardware User Manual Page 16 of 43
4 Hardware Introduction 4.1 Pin Definition 4.1.
4.1.2 Description of Pins The logic signal level of L811-EA module is 1.8V. Pin# Pin Name I/O Reset Idle Value Value Description Power N3 VBAT PI Power input N4 VBAT PI Power input M3 VBAT PI Power input M4 VBAT PI Power input N5 VRTC PO VRTC output N6 VSD2_1V8 PO VSD2_1V8 output POWER_ON/OFF#,RESET N7 RESET_N I Module reset input, pull up(100K ohms),1.8V N8 POWER_ON/OFF# I N9 I2S2_WA O PD T I2S LRCK,CMOS 1.8V N10 I2S2_TX O PD T I2S data transmit, CMOS 1.
G15 SIM1_DATA IO L SIM1 data, internal 4.7K resistor pull up H15 SIM1_CD I T SIM1 detect, pull up(390K ohms)CMOS 1.8V F14 SIM1_DP IO PD USB data plus for SIM1 card G14 SIM1_DN IO PD USB data minus for SIM1 card A11 VBUS PI A12 USB_DN IO T USB Data Minus A13 USB_DP IO T USB Data Plus USB2.0 USB VBUS Supply USB3.
L14 UART1_CTS I PU PU UART1 Clear To Send, CMOS 1.8V J15 WAKEUP I PD PU WAKEUP,CMOS 1.8V K15 W_DISABLE# I PD PU W_DISABLE#,CMOS 1.8V H14 EINT3 I PD PU EINT3,CMOS 1.8V J14 BODY_SAR I PU PU BODY_SAR,CMOS 1.8V L EINT System status indicator A4 CORE_DUMP O PD A5 LPG O PD A7 WAKEUP_HOST O PD L O PD L L15 PA_BLANKING/ TRIG_OUT(T_OUT1) Core dump indicator, CMOS 1.8V LPG,CMOS 1.8V WAKEUP_HOST,CMOS 1.8V PA blanking output/Monitoring Signal Output, CMOS 1.
B3 RFE_RFFE1_VIO PO RFFE1 VIO for tunable ANT,1.
D12 GND GND E2 GND GND E3 GND GND F1 GND GND F2 GND GND F3 GND GND G1 GND GND G2 GND GND G3 GND GND H1 GND GND H2 GND GND H3 GND GND J2 GND GND J3 GND GND K1 GND GND K2 GND GND K3 GND GND K4 GND GND K12 GND GND L1 GND GND L2 GND GND L3 GND GND L4 GND GND L8 GND GND M2 GND GND M8 GND GND M14 GND GND N13 GND GND A1 GND GND A15 GND GND N1 GND GND L811-EA Module Hardware User Manual Page 22 of 43
N15 GND GND TG1 GND GND TG2 GND GND TG3 GND GND TG4 GND GND TG5 GND GND TG6 GND GND TG7 GND GND TG8 GND GND TG9 GND GND TG10 GND GND TG11 GND GND TG12 GND GND TG13 GND GND TG14 GND GND TG15 GND GND TG16 GND GND H：High Voltage Level L：Low Voltage Level PD：Pull-Down PU：Pull-Up T：Tristate OD：Open Drain PP：Push-Pull Note : The unused pins can be left floating in case of circuit design.
5 Hardware Interface 5.1 Power Interface 5.1.1 Power Supply The L811-EA module requires a 3.3V - 4.5V DC power supply that capable of supplying maximum GSM emission current which may up to 2A. Input power supply requirements: Parameter Minimum Value Recommended Value Maximum Value Unit VBAT 3.3 3.8 4.4 V Important notes for the power supply: 1. Voltage fluctuation of the power supply should be lower than 200mV. 2. VBAT should not lower than 3.3V when the voltage dropping occurs.
Parameters Minimum Value Typical Value Maximum Value Unit VSD2_1V8 1.7135 1.8 1.8865 V VIH 0.7* VSD2_1V8 1.8 1.8865 V VIL -0.3 0 0.3* VSD2_1V8 V 5.1.3 VRTC VRTC is the power supply for the internal RTC of the module. In order to let RTC work for a certain time when lost the VBAT power, as the backup power, it is recommended to add a big capacitor at the VRTC pin.
(1.8-1)*C/2 + (1-0.4)*C/1 = 0.4C + 0.6C = 1C Ex. When using a 100uF capacitor, the remaining time is 1*100 = 100 Sec. When using a 330uF capacitor, the remaining time is 1*330 = 330 Sec. If the RTC backup power function is not required, the VRTC pin can be left floating. 5.2 Power on/off and Reset Signal The L811-EA module provides two control signals for power on/off and reset functions.
only needs to control the timing of RESET_N and POWER_ON/OFF# signals. 5.2.1.2 Power off The L811-EA module can be turned off by software or hardware control. Software control is preferred for normal cases, only when software control is not usable, then use the hardware control. By pulling down or float the POWER_ON/OFF# signal, the module will be shut down. ① For details as shown in the following tables: Control Method Action Condition Software AT+CPWROFF Normal control for power off.
5.2.1.3 The Recommended Design of Power on/off The recommended design of POWER_ON/ OFF# signal is as follows: L811-EA Figure 5- 4 Recommended Design of POWER_ON/OFF# Signal 5.2.2 RESET Signal The L811-EA module supports the external reset function. By controlling the RESET_N signal, the module will reset to its initial state. When pulling down the RESET_N signal for 100ms, the module will be reset and restarted.
Recommended design: L811-EA Figure 5- 5 Recommended Design of Reset Circuit 5.3 Status Indicating Signals Pin# Pin Name I/O Description A4 CORE_DUMP O Core Dump Indicator A5 LPG O LPG status Indicating A7 WAKEUP_HOST O The module wakes up the host (Application processor). L15 PA_BLANKING O PA Blanking output, external GPS control signal. 5.3.1 CORE DUMP Indicating The CORE_DUMP signal is used to indicate the mode of the module.
Idle (unregistered) 600ms high level and 600ms low level Idle (registered) 75ms high level and 3s low level Voice communication (Call) Always low level Data communication 75ms high level and 75ms low level Sleep (sleep mode) Always high level 5.3.3 WAKEUP_HOST Signal The WAKEUP_HOST signal is used to wake up the host when there are incoming calls, SMS or other data requests. Status WAKEUP_HOST Signal Default High level Waking HOST(telephone ringing/SMS/other data request) Low level 5.3.
5.4 Interrupt Control Signal The interrupt control signals as shown in the following tables: Pin# Name I/O Description J15 WAKEUP I Wake up the module. K15 W_DISABLE# I Enable/Disable RF network. H14 EINT3 I Android & Linux/Win8 & Win10 dual systems switch. J14 BODY_SAR I Body SAR detection. 5.4.
1 High/Floating 2 Low For Android or Linux system, the module`s USB ports mapped as 3*ACM ports. For Win8 or Win10 system, the module`s USB port is mapped as a MBIM mode. Description: 1. During booting, the implementation of Android & Linux / Win8 & Win10 system change is done by detecting the level of EINT3 signal. The voltage level of EINT3 should be kept stable during booting. 2.
5.5.2 USB Interface Application Reference Circuit Design: L811-EA Figure 5- 6 USB Interface Reference Circuit Design The choice of capacitance for RV101 and RV102 TVS diodes should not greater than 1pF, it is recommended to use 0.5pF TVS diodes. There is no recommended capacitance value for RV100. VUSB pin supplies the power for USB, the recommended power range is 3.3V ~ 4.5V. VBUS pin should not floated or it will become the unknown device.
The definition of UART1 signals as shown in the following tables: Pin# Pin Name I/O Description L14 UART1_CTS I Clear to send K14 UART1_RTS O Request to send A9 UART1_TXD O Data Transmit A10 UART1_RXD I Date Receive 5.6.
5.7.2 USIM Interface Design 5.7.2.1 “Normally Closed” SIM Card Circuit Design Reference Circuit Design:： Figure 5- 7 Reference Design of “Normally Closed” SIM Card Interface Normally closed SIM Connector: 1）When detaching the SIM card, pin 7 and pin 8 shorted together. 2）When inserting the SIM card, pin 7 and pin 8 opened. 5.7.2.
Note: In order to improve the EMC performance, the SIM card slot should be close to the module as much as possible. The filter capacitors for the SIM card signals should be placed close to the SIM card slot as much as possible. The ESD devices (e.g. TVS) shall be added to the SIM card signals for ESD protection. They should be placed close to the SIM card slot as much as possible. SIM1_CD signal supports hot-plugging. Active high by default (It can be changed to active low by an AT command).
(SW2), and Pin7 (SW1) is pulled up with a 4.7K resistor. When the SIM card is not inserted, SW2 and SW1 are opened, and SW2 is low. When the SIM card is inserted, SW2 and SW1 are shorted, and SIM1_CD signal will be pulled high. 5.7.4.2 Software Setup “+MSMPD” command is used for the SIM card detection function: If set AT+MSMPD=0, the SIM card detection function is disabled, and the module will not detect the SIM1_CD signal.
I2S2_CLK0 I2S_CLK I2S2_WA0 I2S_LRCK I2S2_RX I2S_SDOUT I2S2_TX I2S_SDIN Description: I2S interface can be configured as master or slave mode. It supports various audio sampling rates (48KHz, 44.1KHz, 32KHz, 24KHz, 22.5KHz, 16KHz, 12KHz, 11.025KHz and 8KHz). 5.8.
Pin# Name I/O Description M11 I2C_DATA I/O I2C data signal,1.8V signal level M12 I2C_SCL O I2C clock signal, 1.8V signal level The signal connection of L811-EA I2C master and external I2C slave ( such as an audio codec）as shown in the following tables: L811-EA Signal Direction Audio Codec I2C Port I2C_SDA I2C_SDA I2C_SCL I2C_SCL 5.10 Clock Interface L811-EA module supports one 26MHz clock output and one 32KHz clock output. Pin# Pin Name I/O Description 26MHz clock output, 1.8V level.
6 Electrical and Environmental Characteristic 6.1 Electrical Characteristic The table below lists the range of L811-EA’s electrical characteristics: Parameters Minimum Value Maximum Value Unit Power supply signal 0 4.4 V Digital signal 0 1.9 V 6.2 Environmental Characteristic This table below shows the environmental features of L811-EA.
7 RF Interface 7.1 RF PCB Design 7.1.1 Wire Routing Principle The L811-EA module supports double RF antennas, the MAIN_ANT is for transmitting and receiving, and the DIV_ANT is for receiving. Diversity antenna can improve the receiver sensitivity as well as the downlink speed. The RF connectors or solder joints must be connected to the L811-EA module by the trace lines. It is recommended to use the microstrip line for RF line. It should be as short as possible with the insertion loss controlled below 0.
7.1.2 Impedance The impedance of the RF signal line needs to be controlled at 50 Ohm. 7.2 Antenna Design 7.2.1 Main Antenna Design Requirements (1) Antenna efficiency Antenna efficiency is the ratio of the input power and radiant power. Because of the return loss, material loss and coupling loss of the antenna, the radiant power is always lower than the input power. The ratio is recommended to be controlled over 40% (–4dB).
antenna, and add appropriate filtering and shielding protection, or adding filtering devices on the traces.
