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MEIG SLM770A Hardware Design Manual

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SLM770A Module Hardware Design Manual
SLM770A Module
Hardware Design Manual
Controlled Version Number: V1.3
Release Date: 2023/12
美格智能技术股份有限公司
1/75

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Summary of Contents for MEIG SLM770A

  • Page 1 SLM770A Module Hardware Design Manual SLM770A Module Hardware Design Manual Controlled Version Number: V1.3 Release Date: 2023/12 美格智能技术股份有限公司 1/75...

  • Page 2: Important Notice

    Copyright Notice All rights reserved. MeiG Smart Technology Co., Ltd This manual and all its contents are owned by MeiG Smart Technology Co., Ltd and protected by Chinese laws and relevant copyright laws in applicable international conventions. Without the written authorization of MeiG Smart Technology Co., Ltd, no one may copy, disseminate, distribute, modify or use part or all of this manual in any form, and the offenders will be held responsible according to law.

  • Page 3: Revision History

    2. Modify the RTS and CTS pin descriptions V1.2 2023-11-29 3. Add the description of PCM interfaces 4. Add audio pin description 1. Add the SLM770A-SC model description V1.3 2023-12-14 2. Improve the description of analog audio 3. Delete the RF reference circuit MeiG Smart Technology Co., Ltd...

  • Page 4: Table Of Contents

    USB Reference Circuit ....................38 3.10.3 USB Driver ......................... 39 3.11 Serial Port ..........................40 3.12 PCM (SLM770A-SC does not support this function) ............. 41 3.13 Network Status Indication ...................... 43 3.14 STATUS ..........................44 MeiG Smart Technology Co., Ltd...
  • Page 5 SLM770A Module Hardware Design Manual 3.15 USB_BOOT Interface ......................45 3.16 Analog audio interface......................46 GNSS ..............................49 Basic Description ........................49 GNSS performance ........................ 49 Layout guide ........................... 49 Antenna Interface..........................51 Introduction to Antenna Interfaces ..................51 RF Reference Circuit ......................52 Antenna ..........................
  • Page 6 Table 35 Environmental reliability requirements ..................63 Table 36 ESD performance parameter (Temperature: 25℃, Humidity: 45%) ........64 Table 37 SLM770A module scenario power consumption data ............64 Table 38 Abbreviations .......................... 72 Table 39 Description of different coding schemes ................. 76 MeiG Smart Technology Co., Ltd...
  • Page 7 SLM770A Module Hardware Design Manual Figure Index Functional block diagram ................错误!未定义书签。 Figure 1 SLM770A-SC Functional block diagram ............. 错误!未定义书签。 Figure 1 Figure 2 Module pin number diagram（TOP VIEW） ................. 17 Figure 3 Switching machine threshold ....................28 Figure 4 Power requirements for burst transmission................

  • Page 8: Introduction

    SLM770A Module Hardware Design Manual Introduction This document defines the SLM770A module air interface and hardware interface for connecting to customer applications. This document helps customers quickly understand SLM770A module interface specifications, electrical characteristics, mechanical specifications, and related product information. With the help of this document, combined with our application manual and user instructions, customers can quickly apply the SLM770A module to wireless applications.

  • Page 9: Safety Information

    SLM770A Module Hardware Design Manual Safety Information Observing the following safety information can keep you safe and protect the product and its working environment from potential damage: Full attention must be given to driving at all times in order to reduce the risk of an accident.

  • Page 10: Purpose

    In this paper, the basic functions and main features, hardware interfaces and usage methods, structural characteristics, power consumption and electrical characteristics of SLM770A wireless module are described in detail, and the design of embedding SLM770A module into various application terminals is guided.

  • Page 11: Product Overview

    SLM770A Module Hardware Design Manual Product Overview Basic Description SLM770A is support for TDD-LTE/FDD-LTE/WCDMA/GSM wireless communication module. It supports data connection of TDD-LTE and FDD-LTE networks. Can provide voice (PCM), analog voice, short message, address book and other functions for customers' special applications.
  • Page 12 B1/B8 900/1800 SLM770A adopts advanced highly integrated design scheme, integrate RF and baseband on a PCB to complete wireless reception, transmission, baseband signal processing and audio signal processing functions, with a single-sided layout, module structure size: 32.0×29.0×2.4mm. It can meet almost all M2M application requirements, such as: mobile broadband access, video surveillance, hand-held terminals, on-board equipment, ultra-book and other products.

  • Page 13: Main Performance

    SLM770A Module Hardware Design Manual Main Performance The following table details the performance of the SLM770A module. Table 4 List of main features of the module Parameter Description ⚫ VBAT power supply range: 3.3~4.2V ⚫ Power supply Typical supply voltage:3.8V ⚫...
  • Page 14 GNSS features ⚫ Protocol: NMEA 0183 ⚫ RX- diversity Support LTE/WCDMA/ RX- diversity ⚫ Comply with 3GPP TS 27.007, 27.005, and new MeiG AT AT commands commands ⚫ NET_STATUS，NET_MODE two pins indicate the state of the Network indication network ⚫...
  • Page 15 SLM770A Module Hardware Design Manual ⚫ Normal operating temperature: -35℃～+75℃ ⚫ Temperature range Limited operating temperature: -40℃～+85℃ ⚫ Storage temperature: -40℃～+90℃ ⚫ Software upgrade USB interface ⚫ RoHS All hardware components fully comply with the EU RoHS standard ⚫ Environmental humidity 5%~95% MeiG Smart Technology Co., Ltd...

  • Page 16: Application Interface

    SLM770A Module Hardware Design Manual Application Interface Basic Description SLM770A&SLM770A-SC adopts LCC+LGA interface, totally have 144 Pins, including 80 LCC pins and 64 LGA pins, provided with the following functional interfaces: ⚫ Power interface ⚫ USIM/SIM interface ⚫ USB interface ⚫...

  • Page 17: Lcc Card Interface Definition

    USB_DM PWRKEY USB_VBUS RESET_N Reserved USB_BOOT Reserved RESERVED POWER Signals Reserved Figure 1 Module pin number diagram（TOP VIEW） Pin Description The following table describes the definitions of the individual pins for the SLM770A module. MeiG Smart Technology Co., Ltd 77/77...
  • Page 18 SLM770A Module Hardware Design Manual SLM770A - SC 123, 124, 125, 126, 137, 138, 140 pin for the suspended state, 24-27 pin for UART2 pin the feet. Table 5 IO parameter definition Type Description Analog input Analog output Analog input/output...
  • Page 19 SLM770A Module Hardware Design Manual Pin name Description DC features Note number 1.8V power domain, effective at RESET_N Reset the module max=0.5V low level; If unused, keep it open VBAT power Turn on/off the PWRKEY max=0.5V domain, effective at module...
  • Page 20 SLM770A Module Hardware Design Manual USIM card reset USIM_RST signal 1.8V power USIM_ domain, need USIM detection VDD_EXT PRESENCE external pull up to 1.8V 1.8V USIM: Vmax=1.9V Vmin=1.7V Automatic module USIM card supply USIM_VDD 3.0V USIM: recognition 1.8V or voltage Vmax=3.05V...
  • Page 21 SLM770A Module Hardware Design Manual keep it open 1.8V power Clear to send domain. If unused, keep it open 1.8V power Request to send domain. If unused, keep it open Debug Serial Port Pin name Description DC features Note number 1.8V power...
  • Page 22 SLM770A Module Hardware Design Manual 1.8V power domain. Module as the main device, the pin is the output PCM_CLK PCM clock signal, module as the slave device, the pin is the input signal. If unused, keep it open. 1.8V power domain.
  • Page 23 SLM770A Module Hardware Design Manual wakes up the module; in low level the module enters into sleep mode. If unused, keep it open. 1.8V power domain. Do not pull Application up to high level AP_READY processor sleep before the module state detection starts successfully.

  • Page 24: Module Operating Mode

    SLM770A Module Hardware Design Manual Function SD_INS_DET* undeveloped, keep it open. Function SD_CMD* undeveloped, keep it open. Function SD_CLK* undeveloped, keep it open. Function SD_DATA3* undeveloped, keep it open. Function SD_DATA2* undeveloped, keep it open. Function SD_DATA1* undeveloped, keep it open.
  • Page 25 SLM770A Module Hardware Design Manual Table 7 Overview of operating modes Mode Description The module is in idle state and has registered to the GSM GSM IDLE network, ready to send and receive data (SMS and voice service). GSM mode The module is ready for voice talk service;...

  • Page 26: Power Saving

    Hardware I/O interface controls flight mode The W_DISABLE_N pin (PIN4) of SLM770A gives the module a low level signal. The module enters into flight mode and RF sending and receiving unit stops working. Pull up PIN4 and the module will enter into normal mode.

  • Page 27: Power Supply Design

    Send AT+CFUN=1 command to let the module enter into normal mode again. Power Supply Design 3.6.1 Power Supply Pins SLM770A has four VBAT pins for connecting an external power supply, which can be divided into two power supply domains: ⚫ Two VBAT_RF pins are used to power the module RF;...
  • Page 28 SLM770A Module Hardware Design Manual The following figure is the module switch threshold state definition. VOLTAGE(V) POWER_ON POWERON_THRESHOLE UNDEFINED POWEROFF_THRESHOLE POWER_OFF >8S TIME（Sec.） Figure 2 Switching machine threshold The following figure shows the voltage drop during transmitting burst in 2G network. The voltage drop will be less in 3G and 4G networks.
  • Page 29 SLM770A Module Hardware Design Manual external power supply is connected to the module, VBAT_BB and VBAT_RF need to adopt star routing. VBAT_BB wire width shall not be less than 1mm, and VBAT_RF wire width shall not be less than 2mm.

  • Page 30: Reference Design For Power Supply

    VDD_EXT Voltage Output When the SLM770A module is normally started, there is a voltage output on Pin7 with an output voltage of 1.8V and a current load of 50mA. When the module is turned on, this power supply will always output, the power supply capacity is limited, can’t be used for external heavy load circuit, can be used for the...

  • Page 31: Turn On And Off

    Vnorm=3.8V When the SLM770A module is in power down mode, it can be turned on by lowering the PWRKEY. It is recommended to use an open set drive circuit to control the PWRKEY pin. After the STATUS pin outputs the low level, the PWRKEY can be released.

  • Page 32: Turn Off

    SLM770A Module Hardware Design Manual PWRKEY Close to S1 Figure 8 Turn on the module using button Turning on time is illustrated as follows: NOTE VBAT 100ms =VBAT PWRKEY 0.5V 约25ms RESET_N STATUS Inactive Act ive UART Inactive Act ive 约20ms...
  • Page 33 SLM770A Module Hardware Design Manual ⚫ 1: Control module shutdown with PWRKEY pin; pull down the POWERKEY pin for at least 650ms to start the power-off process ⚫ 2: Send AT+POWEROFF command into the power-off process 3.7.2.1 AT Command to Turn Off The AT+POWEROFF command can be used to control module power off.

  • Page 34: Reset The Module

    SLM770A Module Hardware Design Manual Reset the Module There are two ways to restart the SLM770A: Hardware restart, AT command restart. 3.8.1 Hardware reset When the module is working, restart the module by pulling down the RESET_N pin for at least 300ms.

  • Page 35: At Command Reset

    SLM770A module pulling down RESET_N only resets the baseband chip inside the module and does not reset the power management chip. When the RESET_N pin of SLM770A module is pulled down, the baseband chip is in the reset state, and the chip system restarts after release.

  • Page 36: Usim/Sim Interface

    USIM_GND module SLM770A module supports USIM hot plug through the USIM_PRESENCE pin and supports high level detection. By default, the hot plug function is disabled. In the figure, the level of the USIM_PRESENCE pin is high after the SIM card is inserted. When no card is detected, the level of the USIM_PRESENCE pin is low.

  • Page 37: 3.10 Usb Interface

    Note: Not support hot plug SIM Connectors directly on USIM, SIM card hot plug, may cause (U) SIM card or SLM770A (U) SIM interface damage. 3.10 USB Interface The SLM770A provides a USB 2.0 compliant interface that supports both high speed (480Mbps) and full MeiG Smart Technology Co., Ltd 77/77...

  • Page 38: Usb Pin Description

    USB differential data signal + required Ground USB power supply, used for USB USB_VBUS Typical value 5.0V detection 3.10.2 USB Reference Circuit USB interface application reference circuit of SLM770A is shown in the following figure. MeiG Smart Technology Co., Ltd 77/77...

  • Page 39: Usb Driver

    3.10.3 USB Driver SLM770A module support various operating systems, such as PC operating system: Windows 7/8, 10, Windows embedded operating system: Linux version 2.6 or higher, Android2.3/4.0/4.2/4.4/5.0/5.1/6.0 MeiG Smart Technology Co., Ltd...

  • Page 40: 3.11 Serial Port

    AT commands and PPP dialing, the drivers are available. For details, contact support personnel. 3.11 Serial Port The SLM770A module has two serial ports: main serial port and debugging serial port. The main features of these two serial ports are described below. ⚫...

  • Page 41: Pcm (Slm770A-Sc Does Not Support This Function)

    0.45 1.35 The serial port level of SLM770A module is 1.8V. If the client host is 3.3V, the level converter needs to be added in the serial port application. TI's TXB0104PWR is recommended. The following picture is a reference design:...
  • Page 42 SLM770A Module Hardware Design Manual PCM_SYNC 4096 kHz PCM_CLK. The module supports 16-bit linear encoding format. The following is a short frame mode timing diagram (PCM_SYNC = 8 kHz, PCM_CLK = 2048 kHz). Figure 18 Short frame pattern timing diagram...

  • Page 43: 3.13 Network Status Indication

    LED by controlling the on-off of the transistor to realize the LED on and off, not directly drive the LED light). SLM770A module has two network status pins: NET_MODE and NET_STATUS. The following two tables describe pin definitions and logic level changes under different network states respectively.

  • Page 44: 3.14 Status

    SLM770A Module Hardware Design Manual Flash (100ms high/800ms low) Search network process Flash (100ms high/3000ms low) Register network success NET_ STATUS Flash (100ms high/300ms low) Data business High level Others Low level Flight mode, no service, shutdown, etc. The reference circuit is shown in the figure below:...

  • Page 45: 3.15 Usb_Boot Interface

    Figure 21 STATUS reference circuit 3.15 USB_BOOT Interface The SLM770A supports USB_BOOT. The USB_BOOT function requires that the USB_BOOT pin be pulled up to 1.8V before the module VDD_EXT is powered on, and the module will enter the emergency download mode when it is powered on. In this mode, the module can be upgraded through the USB interface.

  • Page 46: 3.16 Analog Audio Interface

    SLM770A Module Hardware Design Manual Module VDD_EXT Test point USB_BOOT Close to module Figure 22 USB_BOOT interface reference circuit Note: Do not pull the USB_BOOT to 1.8V before powering on the VBAT module. During normal startup, USB_BOOT is open without pulling up or down.
  • Page 47 SLM770A Module Hardware Design Manual ⚫ AOUT channel is a differential output and is usually used for a handset Design considerations: It is recommended to use electret microphone to filter out RF interference from the interference source, which will greatly improve the coupled TDD noise. The 33pF capacitor is used to filter out high-frequency interference caused by the module operating at the EGSM900 frequency.
  • Page 48 SLM770A Module Hardware Design Manual 10pF 33pF SPK_P Module 10pF 33pF SPK_N Micro phone 10pF 33pF Figure 24 Handset interface reference circuit Note: The microphone channel is sensitive to ESD, so be sure to add a protective circuit MIC_P/N, SPK_P/N group internal cabling complies with differential cabling requirements MeiG Smart Technology Co., Ltd...

  • Page 49: Gnss

    SLM770A Module Hardware Design Manual GNSS Basic Description The SLM770A includes a complete built-in GNSS solution that supports Qualcomm Gen8C-Lite (GPS, GLONASS, BeiDou). SLM770A modules support the standard NMEA-0183 protocol and output 1Hz NMEA statements via USB interface by default.
  • Page 50 SLM770A Module Hardware Design Manual ⚫ Maximize the distance between the GNSS antenna, the main antenna and the diversity antenna. ⚫ Digital signals such as USIM card, USB interface, camera module, display interface and SD card should be far away from the antenna;...

  • Page 51: Antenna Interface

    SLM770A Module Hardware Design Manual Antenna Interface SLM770A module is designed with a main antenna interface, a diversity receiving antenna interface (used to suppress signal drops due to high-speed movement and multipath) and a GNSS antenna interface. The impedance of antenna interface is 50Ω.

  • Page 52: Rf Reference Circuit

    SLM770A Module Hardware Design Manual RF Reference Circuit ANT_MAIN and ANT_DIV antenna connection is shown in the figure below. In order to obtain better RF performance, pay attention to the following four points in schematic diagram design and PCB layout: In schematic diagram design, reserve π-type matching circuit near the RF port of the module, and...

  • Page 53: Antenna

    SLM770A Module Hardware Design Manual Module 0.1uF GNSS Antenna 47nH 100pF ANT_GNSS Figure 26 Reference circuit of GNSS antenna Antenna 5.3.1 Antenna Requirements The requirements for the main antenna, diversity receiving antenna and GNSS antenna are shown in the following table:...

  • Page 54: Rf Output Power

    (GSM1800/1900, WCDMA B1/B2/B4, LTE B1/B2/B3/B4/B25/B39) Cable insertion loss: < 2dB (LTE B7/B38/B40/B41) 5.3.2 RF Output Power RF output power of SLM770A is shown in the following table. Table 25 SLM770A-C RF transmitted power Frequency Maximum Value Minimum Value EGSM900 33dBm± 2dB 5dBm±...
  • Page 55 23dBm± 2.7dB <-39dBm LTE-TDD B39 23dBm± 2.7dB <-39dBm LTE-TDD B40 23dBm± 2.7dB <-39dBm LTE-TDD B41 23dBm± 2.7dB <-39dBm Table 26 SLM770A-E RF transmitted power Frequency Maximum Value Minimum Value EGSM900 33dBm± 2dB 5dBm± 5dB DCS1800 30dBm± 2dB 0dBm± 5dB WCDMA B1 24dBm+1/-3dB <-49dBm...

  • Page 56: Rf Receiving Sensitivity

    SLM770A Module Hardware Design Manual 5.3.3 RF Receiving Sensitivity Table 27 SLM770A-C Module RF receiving sensitivity Receiving sensitivity (typical value) -10M Frequency 3GPP Main Diversity Main + Diversity (Main + Diversity) EGSM900 -108.5dBm -102.4dBm DCS1800 -108.5dBm -102.4dBm WCDMA B1 -109dBm...

  • Page 57: Working Frequency

    SLM770A Module Hardware Design Manual WCDMA B8 -109.5dBm -110dBm -113dBm -103.7dBm LTE-FDD B1 -96dBm -97dBm -99dBm -96.3dBm LTE-FDD B3 -97dBm -97dBm -100dBm -93.3dBm LTE-FDD B7 -97dBm -98dBm -101dBm -94.3dBm LTE-FDD B8 -98dBm -100dBm -102dBm -93.3dBm LTE-FDD B20 -98.5dBm -98.5dBm -101dBm -93.3dBm...
  • Page 58 SLM770A Module Hardware Design Manual LTE-TDD B39 1880~1920 1880~1920 LTE-TDD B40 2300~2400 2300~2400 LTE-TDD B41 2535~2655 2525~2655 Table 30 SLM770A-E working frequency 3GPP Frequency band Transmit Receive Unit EGSM900 880~915 925~960 DCS1800 1710~1785 1805~1880 WCDMA B1 1920~1980 2110~2170 WCDMA B8...

  • Page 59: Antenna Requirements

    SLM770A Module Hardware Design Manual 5.3.5 Antenna Requirements Table 31 Requirements for antenna index Network Gain Band VSWR Effi. Mode Peak Avg. (dBm) (dBm) <-102 1800(DCS) <-102 Band1 <-102 WCDMA Band8 <-102 Band34 <-94 Band38 <-94 TDD-LTE Band39 <-94 Band40 <-94...
  • Page 60 SLM770A Module Hardware Design Manual 1800(DCS) Band1 WCDMA Band8 Band34 Band38 TDD-LTE Band39 Band40 Band41 Band1 Band3 Band5 FDD-LTE Band7 Band8 Band20 Band28 MeiG Smart Technology Co., Ltd 77/77...

  • Page 61: Electrical Characteristics

    0.25 Environment Temperature Range SLM770A modules are recommended to work at -30~+75℃. It is suggested that temperature control measures should be considered at the application end under adverse environmental conditions. At the same time, the module is provided with a limited operating temperature range, under which some RF indicators may exceed the standard.

  • Page 62: Electrical Characteristics Of Interface In Working Status

    SLM770A Module Hardware Design Manual Table 34 Temperature range of the module Parameter Minimum Typical Maximum Unit ℃ Working temperature ℃ Extended working temperature ℃ Storage temperature Electrical Characteristics of Interface in Working Status VL: logical low level; VH: logical high level;...

  • Page 63: Environmental Reliability Requirements

    SLM770A Module Hardware Design Manual Environmental Reliability Requirements Table 37 Environmental reliability requirements Test item Test condition 1) TL (test temperature value) : -45℃ (adjusted according to product Low temperature demand) storage test 2) tc (sample recovery time) : 1h 3) Test time: 24H (adjusted according to product demand) 1) TH (test temperature value) : +90℃...

  • Page 64: Esd Features

    Air discharge should pass the test grade of ±1KV ESD Features SLM770A module design has considered the ESD problem, and do the ESD protection, but consider SLM770A module in the transport and secondary development may also have ESD problem occurred, so developers to view the protection of the final product ESD problem, besides must consider the antistatic packaging processing.
  • Page 65 SLM770A Module Hardware Design Manual LTE-FDD @ PF = 64（USB disconnect） 3.04 LTE-FDD @ PF = 32（USB disconnect） 3.82 EGSM900 PCL=5(4UP) @ 31.7 dBm 284.7 GSM basic power consumption DCS1800 PCL=0 @ 29.6 dBm 243.2 WCDMA B1 @ 22.98dBm 568.8 WCDMA B1 @ 10.3 dBm...

  • Page 66: Mechanical Characteristics

    Module flatness standard: ≤0.12mm (Steel mesh: it is suggested that customers open the steel mesh reasonably by combining the main board, and it is suggested that customers open the stepped steel mesh to 0.18mm by combining the experience of MeiG module SMT) MeiG Smart Technology Co., Ltd...

  • Page 67: Recommended Packaging

    SLM770A Module Hardware Design Manual Recommended Packaging Recommended Packaging Recommended Packaging Figure 28 Recommended packaging (Top View) (Unit: mm) MeiG Smart Technology Co., Ltd 77/77...

  • Page 68: Top View Of The Module

    SLM770A Module Hardware Design Manual Top View of the Module Figure 29 Top view of the module Bottom View of the Module Figure 30 Bottom view of the module MeiG Smart Technology Co., Ltd 77/77...

  • Page 69: Module Effect Design

    SLM770A Module Hardware Design Manual Module Effect Design Figure 31 Module effect design MeiG Smart Technology Co., Ltd 77/77...

  • Page 70: Storage And Production

    SLM770A Module Hardware Design Manual Storage and Production Storage SLM770A modules are shipped in vacuum sealed bags. The storage of modules is subject to the following conditions: When the environment temperature is below 40℃ and the air humidity is less than 90%, the module can be stored in a vacuum sealed bag for 12 months.

  • Page 71: Production Welding

    SLM770A Module Hardware Design Manual Production Welding Figure 32 Temperature curve of solder reflow Packaging SLM770A modules are packed in pallets. The specifications are as follows: Figure 33 Pallet packaging MeiG Smart Technology Co., Ltd 77/77...

  • Page 72: Annex A Reference Documents And Abbreviations

    SLM770A Module Hardware Design Manual Annex A Reference Documents and Abbreviations Reference Documents ⚫ SLM770A specifications; ⚫ SLM770A AT command set; ⚫ SLM770A reference design circuit; Abbreviations Table 40 Abbreviations Abbreviations Description Adaptive Multi-rate Bit Error Rate Base Transceiver Station...
  • Page 73 SLM770A Module Hardware Design Manual Electromagnetic Compatibility Electrostatic Discharge Frame Relay GMSK Gaussian Minimum Shift Keying GPIO General Purpose Input Output GPRS General Packet Radio Service Global Standard for Mobile Communications Half Rate HSDPA High Speed Downlink Packet Access HSUPA...
  • Page 74 SLM770A Module Hardware Design Manual Personal Computer Printed Circuit Board Personal Cellular System Pulse Code Modulation Personal Communication System Packet Data Unit Point-to-point protocol Packet Switched QPSK Quadrate Phase Shift Keying Subscriber Identity Module TCP/IP Transmission Control Protocol/ Internet Protocol...
  • Page 75 SLM770A Module Hardware Design Manual Maximum Input Low Level Voltage Value Minimum Input Low Level Voltage Value Maximum Output High Level Voltage Value Minimum Output High Level Voltage Value Maximum Output Low Level Voltage Value Minimum Output Low Level Voltage Value MeiG Smart Technology Co., Ltd...

  • Page 76: 10 Annex B Gprs Coding Scheme

    SLM770A Module Hardware Design Manual 10 Annex B GPRS Coding Scheme Table 41 Description of different coding schemes Mode CS-1 CS-2 CS-3 CS-4 Code rate Pre-coded USF Radio Block excl.USF and BCS Tail Coded Bits Punctured Bits Data rate Kb/s 9.05...
  • Page 77 SLM770A Module Hardware Design Manual RF warning for Mobile device: This equipment complies with FCC radiation exposure limits set forth for an uncontrolled environment. This equipment should be installed and operated with minimum distance 20cm between the radiator & your body.
  • Page 78 LTE Band 66 2.8 Label and compliance information The final end product must be labeled in a visible area with the following: “Contains FCC ID: 2APJ4-SLM770A”. The grantee's FCC ID can be used only when all FCC compliance requirements are met.

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