A7670SA 4G LTE CAT 1 Module Breakout Board Instruction Manual

1. Introduction

The A7670SA is a multi-band LTE-FDD/LTE-TDD/GSM/GPRS/EDGE module solution provided on a breakout board, designed for various IoT applications requiring high-throughput data communication. This module supports LTE CAT1 with data transfer speeds up to 10Mbps. It offers robust extension capabilities through rich interfaces such as UART, USB2.0, and GPIO, ensuring flexibility and ease of integration into customer applications.

The A7670SA module utilizes an LGA package, which is compatible with the SIM7070 Series, minimizing investment and enabling a short time-to-market for developers.

2. Key Features

• Small Size LTE Cat1 Module.
• LGA package with rich interfaces (UART, USB2.0, GPIO).
• Suitable for LTE-FDD, LTE-TDD, and GSM networks.
• Rich software functions including FOTA (Firmware Over-The-Air), LBS (Location-Based Service), and SSL (Secure Sockets Layer).
• Package compatible with SIM7070 Series modules.

3. Technical Specifications

3.1. General Specifications

3.2. Frequency Bands (A7670SA)

• LTE-FDD: B1/B2/B3/B4/B5/B7/B8/B28/B66
• GSM: 850/900/1800/1900MHz

3.3. Environmental & Electrical Features

• Operating Temperature: -40℃ ~ +85℃
• Supply Voltage: 3.4V ~ 4.2V
• SIM Card Interface: 1.8V/3.0V

3.4. Data Transfer

• LTE (Mbps): 10 (DL) / 5 (UL)
• GPRS/EDGE (Kbps): 236.8 (DL) / 236.8 (UL)

3.5. Software Features

• Protocols: TCP/IP/IPV4/IPV6/Multi-PDP/FTP/FTPS/HTTP/HTTPS/DNS
• Android RIL Support: Android 5.0/6.0/7.0/8.0/9.0
• USB Driver Support: Microsoft Windows 2000/XP/Vista/Win7/Win8/Win10, Linux, Android
• Firmware Upgrade: USB/FOTA

4. Hardware Setup

4.1. Components Overview

4.2. SIM Card Installation

1. Ensure the breakout board is powered off.
2. Locate the SIM card slot on the board (refer to Figure 1 or Figure 3).
3. Gently insert a standard 1.8V or 3.0V SIM card into the slot until it clicks into place. Ensure correct orientation as indicated on the board.
4. To remove, press the SIM card gently to release it.

4.3. Power Supply Connection

The module requires a supply voltage between 3.4V and 4.2V. Connect your power source to the designated power input pins on the breakout board. Refer to the board's silkscreen for specific pin labels (e.g., VCC, GND).

4.4. Data Interface Connection (UART/USB)

• UART: Connect the module's UART pins (TXD, RXD, GND) to your host microcontroller or development board.
• USB: Connect a USB cable to the micro-USB port on the breakout board for data communication and power (if supported by your setup).

5. Operating Instructions

5.1. Initial Power-Up

1. After connecting the SIM card and power supply, apply power to the breakout board.
2. Observe the status LEDs on the board (if present) to confirm power and network registration.

5.2. Driver Installation

For USB communication with a PC, you may need to install specific USB drivers. These drivers are typically available for Windows (2000/XP/Vista/Win7/Win8/Win10) and Linux. Refer to the module manufacturer's website for the latest driver packages.

5.3. Communication via AT Commands

The A7670SA module is controlled using standard AT commands sent via the UART or USB serial interface. A terminal program (e.g., PuTTY, Tera Term) can be used to send commands and receive responses.

Example Basic AT Commands:

• AT: Checks if the module is responding. (Expected response: OK)
• AT+CSQ: Checks signal quality. (Expected response: +CSQ: <rssi>,<ber>)
• AT+CREG?: Checks network registration status. (Expected response: +CREG: <n>,<stat>)

For a comprehensive list of AT commands and their usage, refer to the official SIMCom A7670SA AT Command Manual.

6. Maintenance

6.1. Firmware Updates

The module's firmware can be updated via USB or FOTA (Firmware Over-The-Air). Regular firmware updates can improve performance, add new features, and address security vulnerabilities. Always follow the manufacturer's guidelines for firmware updates to prevent damage to the module.

6.2. Environmental Considerations

Operate the module within the specified temperature range of -40℃ to +85℃. Avoid exposure to extreme humidity, dust, or corrosive environments to ensure optimal performance and longevity.

7. Troubleshooting

• Module not powering on:
  • Verify the power supply voltage is within the 3.4V-4.2V range.
  • Check all power connections for proper contact.
• No network registration:
  • Ensure the SIM card is correctly inserted and activated.
  • Check signal strength using the AT+CSQ command. If signal is weak, try relocating the module.
  • Confirm the module's frequency bands are compatible with your local network provider.
• No response to AT commands:
  • Verify UART/USB connections (TX/RX swapped?).
  • Check serial port settings (baud rate, data bits, parity, stop bits) match the module's configuration.
  • Ensure the module is fully powered on and initialized.
• Data connection issues:
  • Confirm network registration is successful.
  • Check APN settings are correct for your network provider.
  • Ensure sufficient signal strength.

8. User Tips

• For stable operation, consider using a dedicated power supply that can provide sufficient current, especially during peak transmission.
• Always refer to the official SIMCom documentation for the most detailed specifications and AT command references.
• When integrating into a custom PCB, pay close attention to antenna impedance matching and power supply decoupling for optimal RF performance.

9. Certifications

The A7670SA module has obtained the following certifications:

• CE-RED*
• RCM*
• FCC*
• Anatel*
• RoHS*
• REACH*

*Note: Specific certification details may vary by region and module variant (A7670C, A7670E, A7670SA). Always check the latest documentation for full compliance information.

10. Support and Resources

For further technical support, detailed documentation (including AT command manuals, hardware design guides, and application notes), and software tools, please refer to the official SIMCom website or contact your distributor.

Product Showcase Video: