SIMCOM A7682E Core Board LTE CAT1 Module User Manual

1. Introduction

The SIMCOM A7682E is an LTE Cat 1 module designed for wireless communication, supporting LTE-FDD, GSM, GPRS, and EDGE modes. It offers a maximum downlink rate of 10Mbps and an uplink rate of 5Mbps.

The A7682E features an LCC+LGA form factor, ensuring compatibility with SIM800C and SIM868 series (GSM/GPRS modules). This design facilitates a smooth migration from 2G to LTE products, enabling more flexible product development.

This module supports multiple built-in network protocols and provides drivers for major operating systems including Windows (USB driver), Linux, and Android. Its AT commands are compatible with the SIM800 series modules. The A7682E integrates standard industrial interfaces such as UART, USB, I2C, and GPIO, making it suitable for various IoT applications like telematics, surveillance devices, industrial routers, and remote diagnostics.

Important Notes:

• This product does not come with a SIM card.
• The A7682E module is specifically applicable to Europe, the Middle East, and Africa.
• The A7682E module does not have built-in GNSS functionality.

2. Safety Information

WARNING: Keep out of reach of children.

This product is not suitable for children aged 0-3 years.

3. Specifications

4. Setup Instructions

4.1 Components Required

• SIMCOM A7682E Core Board
• FPC Antenna (if not included with board variant)
• Micro SIM Card (not included)
• Serial Port Connection Wires (for UART communication)
• USB Adapter (for connecting to computer)
• Computer (Windows, Linux, or Android)

4.2 Connection Overview

4.3 Step-by-Step Setup

1. Connect FPC Antenna: Attach the FPC antenna to the designated antenna port on the core board (ANT_4G1 for 4G/GSM, ANT_BT for Bluetooth if supported, GPSANT for GPS if supported by module variant).
2. Insert Micro SIM Card: Carefully insert a Micro SIM card into the SIM card slot on the board.
3. Serial Port Connection: Connect the serial port wires (DTR, GND, VDD-5V, POWRKEY, UTX-TXD, URX-RTD, GND-GND) from the core board to your USB adapter or MCU as shown in Figure 7. Ensure correct polarity and pin mapping.
4. Connect to Computer: Plug the USB adapter (connected to the core board) into your computer's USB port.
5. Power Indicator: Upon connection, the power indicator light on the core board will turn red.
6. Power On: Use tweezers or a similar tool to momentarily press the POWRKEY key on the core board to turn it on.
7. Operation Confirmation: When the indicator light turns green, the main board is operating normally.

Note on Power and Logic Levels:

• The VCC range for the module is 5V to 16V; 5V is recommended for stable operation.
• TXD/RXD pins operate at 3.3V TTL level and can be directly connected to a 3.3V MCU.
• The module boots up after the VCC to POWRKEY connection is pulled up for more than 5 seconds.
• For successful booting, the core board's `pwk` pin needs to be associated with `VDD`.
• In Windows 10, a post-installation driver will define the module as a network interface. In Linux, it can typically start without a specific driver.

Video 1: Demonstration of connecting the A7682E Core Board to a computer and sending AT commands.

5. Operating Instructions

5.1 AT Command Interface

The A7682E module is controlled via AT commands. After successful setup and power-on, you can send instructions to the module through a serial terminal on your computer.

5.2 Sleep Mode Control

• If the user sets the AT command AT+CSCLK=1, pulling up the DTR pin will cause the module to automatically enter sleep mode. Serial port communication will not function normally in this state. To wake the module, pull down the DTR pin.
• If the user sets the AT command AT+CSCLK=0, pulling up the DTR pin will have no effect, and serial communication will remain normal.

5.3 Other Interfaces

• GPS Antenna Interface: Supports both passive and active GPS antennas. Note that GPS functionality is only supported by SIM868/A7680x-R2 variants, not the A7682E module itself.
• 4G Antenna Interface: This is the main antenna interface for LTE and GSM modules.
• Bluetooth Antenna Interface: Bluetooth is only supported by SIM868/SIM800C variants.
• SIM Card Holder: Supports MicroSIM cards.
• Mini USB: Connects via a Mini USB cable for data and power.

6. User Tips

• When connected via USB, the module can function as a modem on both Windows and Linux operating systems.
• For Raspberry Pi and Arduino projects, UART communication is generally effective.
• GPS functionality, when available on compatible modules, can be polled and works through the terminal.
• While the module supports voice, some users have reported difficulties with making or receiving calls, though SMS and HTTP POST/GET functions typically work well.

7. Troubleshooting

• Module Not Powering On: Ensure the VCC to POWRKEY connection is pulled up for at least 5 seconds during startup. Verify power supply is within the 5-16V DC range (5V recommended).
• No Serial Communication: Check if the module is in sleep mode (AT+CSCLK=1). If so, pull down the DTR pin to wake it up. Verify TXD/RXD connections and ensure they are connected to 3.3V TTL logic levels.
• Network Connection Issues: Confirm that a valid Micro SIM card is inserted and activated. Check antenna connections. Ensure the module variant is compatible with your region's network bands (A7682E is for Europe/Middle East/Africa).
• Driver Issues (Windows): If the module is not recognized as a network interface, ensure the necessary post-installation drivers are installed.
• General Issues: Refer to the official SIMCOM AT command manual and STM32 code for detailed application descriptions and advanced troubleshooting.

8. Applications

The A7682E Core Board is versatile and can be integrated into various IoT and M2M applications:

• Intelligent Agriculture: Agricultural irrigation systems, smart greenhouses, animal husbandry, and cloud-based control platforms.
• Sharing Economy: Toy cars, massage chairs, vending machines, toy machines, and coffee machines requiring connectivity.
• Wisdom Energy: Charging piles and data monitoring for energy management.
• Smart Industry: Remote control systems, data monitoring, and industrial routers.
• Other Applications: Telematics, surveillance devices, and remote diagnostics.

9. Maintenance

To ensure the longevity and optimal performance of your A7682E Core Board, follow these general maintenance guidelines:

• Keep the module in a clean, dry environment, away from dust and moisture.
• Avoid exposing the module to extreme temperatures or direct sunlight.
• Handle the board with care to prevent physical damage to components or connectors.
• Ensure proper ventilation when the module is in operation to prevent overheating.
• Regularly check for firmware updates from the manufacturer to improve performance and security.

10. Warranty and Support

For detailed warranty information and technical support, please refer to the manufacturer's official documentation. An item guide and document, including a user manual in PDF format, is available for further reference.

Manufacturer: Hunan Sanai Electronic Technology Co., Ltd
Address: Building C3, Yupingshan International Industrial City, Xieyuan Road, Ningxiang Economic and Technological Development Zone, Changsha City, Hunan Province
Email: pur1@muz-tech.com
Telephone: 86-18188996558

EU Authorized Representative: EUREP ENV S.L.
Address: ES-AVDA INDUSTRIA, NUM 16, ESC. A, PUERTA 207, 28760 TRES CANTOS - (MADRID)
Email: eurep@eurep-gmbh.de
Telephone: 34-67870708

The product conforms to relevant Union legislation, including the Electromagnetic Compatibility Directive 2014/30/EU and the Restriction of the use of certain hazardous substances (RoHS) Directive 2011/65/EU.

For the PDF user manual, please refer to the official product page or contact support.