SLM332L Hardware Design Manual

Introduction

This document details the SLM332L module and the air and hardware interfaces between the module and customer applications. It aims to help customers quickly understand the SLM332L module's interface specifications, electrical characteristics, mechanical specifications, and related product information. This manual, along with MeiG Smart's application manual and user guide, facilitates the rapid application of the SLM332L module in wireless applications.

The SLM332L is a broadband wireless terminal product supporting TDD-LTE/FDD-LTE multiple network standards and frequency bands, offering data access and SMS functionalities. It supports TDD-LTE at 8Mbps/2Mbps and FDD-LTE at 10Mbps/5Mbps, making it suitable for M2M applications such as OTT, CPE, routers, data cards, tablets, security devices, and industrial-grade PDAs.

Safety Instructions

Adhere to safety principles to ensure personal safety and protect the product and work environment. Key safety points include:

• Prioritize driving safety; use hands-free functions or pull over for calls.
• Turn off the mobile terminal before boarding aircraft; using wireless functions onboard is prohibited and may be illegal.
• Be aware of restrictions on mobile terminal use in hospitals and healthcare facilities due to potential RF interference with medical equipment.
• Ensure the device is on and has sufficient signal strength for emergency calls, even if not connected to a network or with an invalid SIM.
• Radio frequency interference may occur near electronic equipment when the device is on.
• Keep mobile devices away from flammable gases and turn them off in potentially explosive locations like gas stations or chemical plants.

Document Purpose

This document elaborates on the basic functions, main features, hardware interfaces, usage methods, structural characteristics, power consumption indicators, and electrical characteristics of the SLM332L wireless module. It guides users in embedding the SLM332L module into various application terminals.

Content Overview

This manual is structured as follows:

• Chapter 1: Safety instructions, document purpose, revision records.
• Chapter 2: Basic functions and main features of the SLM332L wireless module.
• Chapter 3: Functions, features, and usage methods of each hardware interface.
• Chapter 4: Antenna interface-related content and precautions.
• Chapter 5: Electrical characteristics.
• Chapter 6: Structural characteristics and precautions.
• Chapter 7: Storage and production considerations.
• Chapter 8: Appendix A - Reference Documents and Abbreviations of Terms.

Product Overview

Basic Description

The SLM332L is a wireless communication module supporting TDD-LTE/FDD-LTE, providing data connections and SMS functions. It also supports Wi-Fi Scan (Chinese version only) and GPS/BDS/GLONASS/Galileo/QZSS positioning. The module supports specific frequency bands for TDD-LTE (B34/B38/B39/B40/B41) and FDD-LTE (B1/B2/B3/B4/B5/B7/B8/B20/B28/B66). Its highly integrated design features RF and baseband on a single PCB, with a compact size of 15.8 x 17.7 x 2.4 mm.

Main Performance

The SLM332L module offers the following key performance characteristics:

• Power Supply: VBAT supply voltage range of 3.5V to 4.35V, with a typical voltage of 3.8V.
• Transmission Power: Class 3 (23 dBm ± 2.7 dB) for both FDD-LTE and TDD-LTE bands.
• LTE Features: Supports CAT1 Bis, RF bandwidth of 1.4-20 MHz. Maximum speeds are 5Mbps upstream/10Mbps downstream for FDD-LTE, and 2Mbps upstream/8Mbps downstream for TDD-LTE.
• Location: Supports Wi-Fi Scan positioning and shares the main antenna.
• Network Protocols: TCP/UDP/MQTT/FTP/FTPS/HTTP/HTTPS/LWM2M/CoAP.
• USIM Card Interface: Supports 1.8V / 3V USIM/SIM cards.
• PCM Interface: For audio, requires an external CODEC chip; supports 16-bit linear encoding and short frame mode (module as master).
• LCD Interface: Supports SPI_LCD with a resolution of 240x320.
• I2C Interface: Supports 2 I2C interfaces.
• USB Interface: Supports USB 2.0 for AT commands, data transmission, software debugging, and upgrades. Compatible with Windows 7, 8/8.1, and 10.
• Serial Port: Main serial port for AT commands and data transfer (default baud rate 115200 bps, supports RTS/CTS hardware flow control). Debugging serial port for log output only.
• AT Command: Compliant with 3GPP TS 27.007, 27.005, with additional MeiG AT commands.
• Network Indications: NET_STATUS pin indicates network state.
• Antenna Interface: Main antenna (ANT_MAIN), Wi-Fi Scan antenna (ANT_MAIN), and GNSS interface (ANT_GNSS).
• Physical Characteristics: Size: 15.8 x 17.8 x 2.4 mm.
• Temperature Range: Normal working temperature: -30°C to +75°C; Storage temperature: -40°C to +85°C.
• Software Upgrades: Via USB interface.
• RoHS: All devices are EU RoHS compliant.
• Ambient Humidity: 5%-95%.
• Functional Interfaces: Power, USB 2.0 High-Speed, USIM/SIM card (3V/1.8V), hardware reset, indicator light, ADC.

Module Function Block Diagram

The module's main functional components include the Base Band (BB), RF, Power Management Unit (PMU), and Peripheral Interface.

Evaluation Board Interfaces

The evaluation board supports the following interfaces:

• UART interface
• PCM interface (Optional)
• LCM interface
• I2C interface
• USB_BOOT interface