ng L831-EA Module Hardware User Manual Version: V1.0.
Confidential Material This document contains information highly confidential to Fibocom Wireless Inc. (Fibocom). Fibocom offers this information as a service to its customers, to support application and engineering efforts that use the products designed by Fibocom. The information provided is based upon requirements specifically provided to Fibocom by the customers. All specifications supplied herein are subject to change.
FOR FCC 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.
IMPORTANT NOTE: This module is intended for OEM integrator. The OEM integrator is still responsible for the FCC 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.
Revision History Version Date Remarks V1.0.0 2014-12-30 Initial version V1.0.
Applicability Table No.
Contents IMPORTANT NOTE:................................................................................................................................................... 4 1 Preface..................................................................................................................................................................... 10 1.1 Outline.....................................................................................................................................................
5.5.1 USIM Pins......................................................................................................................................... 30 5.5.2 Description of USIM........................................................................................................................ 30 5.5.2.1 “Normally Closed”SIM Circuit Design............................................................................ 30 5.5.2.2 “Normally Open” SIM Circuit Design..........................................
7.2.2 Impedance Design...........................................................................................................................42 7.3 Antenna Design........................................................................................................................................... 42 7.3.1 Antenna Design Requirements.....................................................................................................
1 Preface 1.1 Outline The document outlines the electrical, RF performance, mechanical size and application environment of L831-EA wireless module. Under the help of the document and others application notice, the application developer could understand quickly the performance of L831-EA series wireless module, and developing the product. 1.2 Standards The products `reference design standard as listed below: 3GPP TS 27.007 -v6.9.0: AT command set for User Equipment (UE) 3GPP TS 27.005 -v6.0.
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 36.101 V9.18.0: User Equipment (UE) radio transmission and reception 3GPP TS 36.104 V9.13.0: Base Station (BS) radio transmission and reception 3GPP TS 36.106 V9.4.0: FDD Repeater radio transmission and reception 3GPP TS 36.113 V9.5.
2 Introduction 2.1 Description L831-EA modules are highly integrated LTE M.2 wireless communication modules, supports 3 module 12 band and the global main 4G/3G/2G modes (LTE FDD/WCDMA/GSM) These bands support the mobile operators `cellular network of the Europe & Asia-Pacific and American marketing. 2.
2G Talk：300mA (GSM PCL5) Interfaces RF Interface Antenna : Mainx1，Diversityx1 1 x USB 2.0，Multiple Profiles over USB Function Interface SIM Support，I2C Support，I2S/PCM Support GPIO，Clock Data Features Protocol Stack EDGE GPRS Embedded TCP/IP and UDP/IP protocol stack Multi-slot class 33 (5 Down; 4 Up; 6 Total) Coding Scheme MCS1~9 Multi-slot class 33 (5 Down; 4 Up; 6 Total) Coding Scheme MCS1~4 CSD UMTS(14.4kbps)，GSM(9.
Note: 1. Please make sure the temperature for device will not be higher than 55˚C. 2. The minimum distance between the user and/or any bystander and the radiating structure of the transmitter is 20cm. 3. Assessment of compliance of the product with the requirements relating to the Radio and Telecommunication Terminal Equipment Directive (EC Directive 1999/5/EC) was performed by PHOENIX TESTLAB (Notified Body No.
2.3 Appearance The following pictures show the L831-EA wireless module.
3 Mechanical 3.
3.2 Application Interface Description L831-EA module uses 75-pin gold fingers as the external interface, the size of the module please refer to the section3.1. As shown in Figure 4-2, L831-EA module uses the 75-pin fingers interface (67pin is the signal interface and Pin8 is notch). About the naming rules of M.2, L831-EA adopts the Type 3042-S3-B (30mmx42mm,the maximum thickness of element layer of Top surface is 1.5mm, the thickness of PCB is 0.8mm, Key ID is B).
3.3 M.2 Connector Recommend to use the M.2 connector from LOTES, the type is APCI0026-P001A,the package of connector design please refer to the relevant specifications. As shown in Figure 3-2: Figure 3-2 Size of APCI0026-P001A M.
4 Hardware Overview 4.1 Pins Definition 4.1.1 Pins Number 74 72 +3.3V +3.3V 70 +3.3V 68 CLK32K 66 SIM_DETECT 64 NC 62 NC 60 NC 58 NC 56 NC 54 NC 52 NC 50 48 46 44 42 40 38 36 34 32 30 28 26 24 22 20 NC TX_BLANKING SYSCLK GNSS_IRQ GNSS_SDA GNSS_SCL NC UIM_PWR UIM_DATA UIM_CLK UIM_RESET I2S_WA W_DISABLE2# I2S_RX I2S_TX I2S_CLK Notch Notch Notch Notch LED1#(3.3V) W_DISABLE1#(3.3V) FUL_CARD_POWER_OFF#(1.8V) +3.3V +3.
CONFIG_3 1 Figure4- 2 Pins Definition (Top View) 4.1.2 Pins Description The description of L831-EA pins as listed below: Pin# Name I/O Reset Idle Value Value Description The internal connects with GND, the 1 CONFIG_3 O L L interface type of L831-EA module is WWAN-SSIC0. The main power input, the voltage 2 +3.3V 3 GND 4 +3.
module is WWAN-SSIC0 22 I2S_RX O T T I2Sserial data output, CMOS 1.8V The module wake up the Host device 23 WOWWAN# O PU PU signal，low level is available，CMOS 1.8V. 24 I2S_TX I 25 DPR I T T I2Sserial data input, CMOS 1.8V Body SAR Detect，CMOS 1.8V GPS Disable signal, low level is 26 W_DISABLE2# I PU PU available, CMOS 1.8V (not support yet). 27 GND GND 28 I2S_WA 29 SSIC-RXN/USB3.0-RX-(NC) 30 UIM_RESET O 31 SSIC-RXP/USB3.
43 NC NC 44 GNSS_IRQ 45 GND 46 SYSCLK 47 NC 48 TX_BLANKING 49 NC NC 50 NC NC 51 GND 52 NC NC 53 NC NC 54 NC NC 55 NC NC 56 NC NC 57 GND 58 NC 59 ANTCTL0 60 NC I PU PU The switch interrupt signal of Win8/Android system. GND O L L 26MHz clock output. NC O L L GSM TDMA Timer output signal, the GPS control signal, CMOS 1.8V GND GND NC Tunable antenna control signal O GPO,CMOS 1.
will be pulled up. 67 RESET# I 68 CLK32K O PU PU External reset signal input, CMOS 1.8V 32KHz clock output. The internal connects with GND, the 69 CONFIG_1 O L L interface type of L831-EA module is WWAN-SSIC0. 70 +3.3V 71 GND 72 +3.3V 73 GND 74 +3.3V The main power input, the voltage PI range is : 3.135V ~ 4.4V GND The main power input, the voltage PI range is : 3.135V ~ 4.4V GND The main power input, the voltage PI range is : 3.135V ~ 4.
5 Hardware Interface 5.1 Power Interface 5.1.1 Power Supply L831-EA module requires a 3.135V~ 4.4V DC power supply to provide the maximum GSM emission current with 2A. Input power supply requirements as listed below: Parameters Minimum Recommended Maximum Unit +3.3V 3.135 3.3 4.4 V Note: 1. The ripple of Power supply must be lower than 200mV. 2. The minimum value of power supply voltage drops shall more than 3.135V.
5.2 Power on/off and Reset Signal L831-EA wireless module supports 2 control signals for the modules` power on/off and the reset operation. The definition of the pins as listed below: Pin# Pin Name Electrical Level Description 6 FUL_CARD_POWER_OFF# CMOS 1.8V Power on/off signal 67 RESET# CMOS 1.8V External reset signal input. 5.2.1 Power on/off Signal 5.2.1.1 Power on Clients can pull up the FUL_CARD_POWER_OFF# signal while the module is power on, then the module will turn on.
off it, pull down the FUL_CARD_POWER_OFF# or floating. For details as listed below: Off modes Methods Condition Software Send AT+CPWROFF commands. Normal power_off Hardware Pull down the FUL_CARD_POWER_OFF# or floating. Only used for system halted or happens exceptions and the software modes can not be used.
Figure 5- 3 the recommended design of FUL_CARD_POWER_OFF# signal 5.2.2 RESET Signal L831-EA wireless module supports external reset function. The module can back to initial state through Reset _N signal. While the RESET# signal is active low and keep 100ms, the module will reset and restart. The internal PMU cannot power cut while the clients execute the RESET function.
5.3 Index Signal 5.3.1 Index Signal Pins L831-EA module used for providing drain output signal and indicate RF condition: Pin # Name Description 10 LED1# Close or open the condition indication of RF network, CMOS 3.3V The condition description of LED1# signal as listed below : No. Condition LED1# 1 RF open Low level 2 RF closed High level The recommended design as follows: Figure5- 5 Recommended design of LED condition index 5.4 USB Interface 5.4.
Modem COM port is so slow, and cannot up to 100Mbpss, the uplink requirements of LTE. So it is not suggested. The Modem COM can be used to initiate data services temporarily only while the client`s NCM port is useless. 5.4.2 Application for USB Interface The recommended circuit design as follows: Figure5- 6 Recommended circuit design of USB interface T101 and T102 shall choose the TVS pipes witch less than 1pF. VUSB supply power has connected within the module, so the VBUS pin of Host end can float.
5.5.1 USIM Pins Pin# Name Type Description 36 UIM_PWR O USIM power supply signal 30 UIM_RESET O USIM Reset signal 32 UIM_CLK O USIM clock signal 34 UIM_DATA I/O USIM data signal The detection signal for SIM insetting The default is 390K ohm resistance pulled up and 66 SIM_DETECT I input. High level: SIM is present. Low level: SIM is absent 5.5.2 Description of USIM 5.5.2.
5.5.2.2 “Normally Open” SIM Circuit Design Referenced Circuit Design: Figure5- 8 “Reference Design of “Normally open” SIM Card Interface Normally Open SIM Connector: 1）Pull out SIM card, pin 7 and pin 8 disconnect. 2）Inset SIM card, pin 7 and pin 8 short-circuit . Note: For improving EMC performance, SIM card connector should be closed to the module. For improving the anti-jamming capability of SIM card, please choose the SIM card socket with masking function.
The signal lines of SIM cards shall do some ESD protection , and it request to choose the ESD protected components with low capacitance, such as Zener diode. Recommend the clients to use the ESD components and the equivalent capacitance shall be less than 33pF. ESD components shall near to SIM card interfaces while layout. 5.5.4 USIM Hot Plug L831-EA module supports the status detection function, and this function can realize hot plug of SIM card . 5.5.4.
The description of I2S signal as listed below: Pin# Name Type Description 20 I2S2_CLK O Bit clock 28 I2S2_WA0 O Left- right clock (LRCK) 22 I2S2_TX O Serial data output 24 I2S2_RX I Serial data input 5.6.1 Description of I2S Interface L831-EA Signal Direction Audio CODEC I2S Port I2S_CLK I2S_CLK I2S_WA I2S_LRCK I2S_RX I2S_SDOUT I2S_TX I2S_SDIN Note: I2S interfaces can be configured to master or slave modes . It supports various audio sample rates (48KHz, 44.
configuration of data transmission. Supports various audio sample rates (48KHz,44.1KHz,32KHz, 24KHz,22.5KHz,16KHz,12KHz,8KHz, 11.025KHz). Note: Cause the timing of I2S modes is easier than PCM modes and easier to fit, recommend clients to use transmission audio of I2S mode. While transmission with PCM modes, the PCM timing sequence is difficult to fit to make the tone quality become bad. 5.
No. W_DISABLE# Function 1 Low WWAN closed 2 High WWAN opened 3 Floating The function of WWAN defined by AT commands , and keep open by default . 5.8.2 Description of GPS_DISABLE# Interface L831-EA module provides through hardware to open/close GPS function signal, this function can also control by AT commands. Pin# Name 26 I/O W_DISABLE I 2# Description GPS open/close signal , and the signal with 1.8V The definition of GPS_DISABLE# signal as listed below: No.
5.11 BODY_SAR Interface L831-EA module supports BODY_SAR (DPR pin) function. BODY_SAR is input signal (the signal is output directly by the AP end), with high level by default, and low level is effectively. While the human nearing, AP can detect it through the distance sensor, then output the BODY_SAR signal with low level. While the module detected the signal through the interruption, the module `s Tx power will be reduced and the threshold value can be set by the AT commands.
1 CONFIG_3 O Connect to GND within the module 0 21 CONFIG_0 O NC - 69 CONFIG_1 O Connect to GND within the module 0 75 CONFIG_2 O Connect to GND within the module 0 The configuration of M.2 Socket 2 Module as listed below : Config_0 (pin21) Config_1 (pin69) Config_2 (pin75) Config_3 (pin1) Module Type and Main Host Interface Port Configuration GND GND GND GND SSD-SATA N/A GND GND N/C GND WWAN-PCIe N/A GND GND GND N/C WWAN-USB3.0 0 5.15 RF Interface 5.15.
Figure 5-10 Structure diagram of RF connecting seat Figure 5-11 0.81mm coaxial line Figure 5-12 RF connector insert into RF connecting seat 5.15.
Frequency range DC to 6GHz Temperature range : Characteristic impedance 50Ω –40°C to +85°C 5.16 Other Interfaces The following interfaces are not supported now: GPIO and Tunable ANT.
6 Electrical and Environmental 6.1 Electrical This table shows the electrical features range of L831-EA module. Parameter Minimum Value Maximum Value Unit Power supply 0 4.4 V Digital Signal 0 1.9 V 6.
7 RF Interface 7.1 Operating Band 7.1.
7.2.2 Impedance Design The impedance of RF signal lines should be controlled within 50ohm. 7.3 Antenna Design 7.3.1 Antenna Design Requirements (1) Antenna Efficiency Antenna efficiency is the ratio of antenna input power to radiation power. Cause the return loss, material loss, and coupling loss, the radiation power is always lower than the input power. Recommended value> 40% (–4dB) (2) S11 or VSWR S11 can indicates the 50ohm`s matched-degree of antenna .To some degree, it affects the antenna efficiency.
or do some filtering on the routing.
