SIMCom A7670E 4G LTE Cat 1 Module User Manual

1. Introduction

The SIMCom A7670 series is an LTE Cat 1 module designed for wireless communication, supporting LTE-TDD, LTE-FDD, GSM, GPRS, and EDGE modes. It offers a maximum downlink rate of 10Mbps and an uplink rate of 5Mbps. The module features an LGA form factor, ensuring compatibility with SIM7000/SIM7070 (NB/Cat M) and SIM800A/SIM800F (2G) series modules, which facilitates seamless migration for various product designs.

The A7670 series integrates multiple built-in network protocols and provides drivers for major operating systems including Windows, Linux, and Android. Its AT commands are compatible with SIM7500/SIM7600 series modules. With abundant interfaces such as UART, USB, I2C, and GPIO, the A7670 series is suitable for a wide range of IoT applications, including telematics, surveillance devices, POS systems, industrial routers, and remote diagnostics.

Module Suffix and Regional Applicability:

• G (Global): Global coverage.
• E (Europe/Middle East/Africa): Specific to these regions.
• NA (North America): Specific to North America.
• C (China): Specific to China.
• JC (Japan): Specific to Japan.
• SA (New Zealand/Australia/South America): Specific to these regions.

2. Specifications

2.1 General Specifications

• Type: Core Board
• Origin: Mainland China
• Condition: New
• Form Factor: LCC+LGA
• Dimensions: 24.0 x 24.0 x 2.4 mm
• Operating Temperature: -40℃ to +85℃
• Wireless Communication Modes: LTE-TDD/LTE-FDD/GSM/GPRS/EDGE
• Data Rates: Max 10Mbps downlink, 5Mbps uplink
• Control Interface: AT Command
• Interfaces: UART, USB2.0, I2C, GPIO
• Drivers: Windows, Linux, Android
• GNSS: Optional
• Second SIM Card Slot: Optional

2.2 Module Versions

• Data version 1: Uses the A7670E-LNXV module (without Voice)
• Data version 2: Uses the A7670E-LASE module
• GNSS version 1: Uses the A7670E-MASA module (without Voice)
• GNSS version 2: Uses the A7670E-FASE module

2.3 Frequency Bands

The specific frequency bands depend on the module version (e.g., A7670E, A7670SA). Refer to the product table for details.

3. Component Overview and Pin Definition

3.1 Board Overview

3.2 Pin Definition of 6-pin Connector

Note: VCC range is from 5.0V to 10V, 5.0V is recommended. Please ensure 2A current for the VCC pin. TXD /RXD are 3.3V TTL level which can be directly connected with 3.3V MCU.

4. Setup Instructions

4.1 Initial Hardware Connection

1. Install the LTE antenna. If your module supports GPS, install the GPS antenna.
2. Insert a Nano SIM card into the designated SIM card slot (CN2).
3. Connect the power supply to the VCC pin. The recommended VCC range is 5.0V to 10V, with 5.0V being ideal. Ensure a 2A current for the VCC pin.
4. Connect the module to your computer via the USB interface (CN1).

4.2 Driver Installation

After connecting the module via USB, install the SIMCom_USB_Drivers A7670.rar driver. Follow the computer's prompts for installation. A successful installation will show multiple COM ports in your device manager, such as:

• SimTech HS-USB AT Port 9001 (COMxx)
• SimTech HS-USB Audio 9001 (COMxx)
• SimTech HS-USB Diagnostics 9001 (COMxx)
• SimTech HS-USB NMEA 9001 (COMxx)

4.3 Network Registration Indicator

Observe the GREEN NET LIGHT indicator (D5):

• Blinking quickly: Indicates the module is searching for a network (un-registration network).
• Blinking slowly: Indicates successful network registration.
• Always On: Searching Network
• 200ms ON, 200ms OFF: Data Transmit
• 800ms ON, 800ms OFF: Registered network
• OFF: Power off / Sleep

Ensure a correct NB-IoT SIM card is inserted for proper network functionality.

5. Operating Instructions

5.1 Using TXD and RXD (UART Communication)

The TXD and RXD pins operate at a 3.3V TTL level and can be directly connected to a 3.3V MCU. The default baud rate for UART communication is 115200bps.

5.2 Testing with AT Commands via UART/USB

To test the BK-A7670 module using AT commands, you will need a serial software tool like sscom32E.exe.

1. Open the serial software (e.g., sscom32E).
2. Select the correct serial number (COM port) corresponding to the module (e.g., AT Port 9001).
3. Set the Baud rate to 115200bps.
4. Ensure the "SendNew" option is selected for sending commands.
5. In the command input window, enter AT commands to query module information or control its functions.

The output in the terminal will display basic information about the module, such as manufacturer, model, revision, and IMEI. The last line typically shows the network registration status.

6. Maintenance

• Keep the module in a dry environment to prevent moisture damage.
• Avoid exposing the module to extreme temperatures outside its operating range (-40℃ to +85℃).
• Handle the module with care to prevent physical damage to components or connections.
• Ensure proper electrostatic discharge (ESD) precautions are taken when handling the module.

7. Troubleshooting

• No Power/Module Not Responding: Verify that the VCC pin receives power within the 5.0V to 10V range (5.0V recommended) and that the current supply is at least 2A. Check all power connections.
• Network Registration Issues: Observe the GREEN NET LIGHT indicator (D5). If it's blinking quickly, the module is searching for a network. If it remains off or doesn't change status, ensure a compatible and correctly inserted Nano SIM card is used.
• Communication Problems (UART/USB): Confirm that the correct drivers are installed and the appropriate COM port is selected in your serial terminal software. Ensure the baud rate is set to 115200bps. Check TXD/RXD connections for proper 3.3V TTL levels.
• AT Command Errors: Double-check the syntax of your AT commands. Ensure the serial software is configured to send new lines correctly (e.g., "SendNew" selected).

8. User Tips

• Compatibility: The A7670 series is noted to be a good replacement for SIM900 (2G) modules, often allowing the use of the same AT instructions without program changes.
• Regional Use: Always verify the module's specific version (e.g., A7670E for Europe/Middle East/Africa) to ensure compatibility with local network bands and regulations in your target region.
• Certifications: For commercial or specific project use, inquire about relevant certifications (CE, RED, RoHS) from the manufacturer or seller to ensure compliance.
• GSM Mode: Users have reported successful operation in GSM mode. If GPS functionality is critical, ensure you have a GNSS-enabled module version and the appropriate antenna.

9. Manufacturer & EU Representative Information

9.1 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

9.2 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

9.3 Conformity

This product conforms to the relevant Union legislation:

• Electromagnetic compatibility Directive: 2014/30/EU
• Restriction of the use of certain hazardous substances (RoHS) Directive: 2011/65/EU

The harmonized standards and technical specifications have been applied.

10. Safety Information

• WARNING: Keep out of reach of children.
• This product contains electronic components that may be harmful if ingested or improperly handled.
• Always ensure proper ventilation when operating the module to prevent overheating.
• Do not attempt to modify or disassemble the module beyond the instructions provided, as this may void warranties and create safety hazards.
• Use only recommended power supplies and accessories.