1. Introduction
The SIMCOM A7670C-MANS Core Board is a versatile communication module designed for Machine-to-Machine (M2M) and Internet of Things (IoT) applications. It integrates LTE Cat1, 2G (GSM/GPRS/EDGE), Global Navigation Satellite System (GNSS), and voice capabilities into a compact form factor. This module provides efficient data transmission, accurate positioning, and robust connectivity for a wide range of embedded systems.
2. Setup Guide
This section outlines the steps for setting up your A7670C-MANS Core Board.
2.1 Hardware Overview
- 1: MAIN - Main antenna connector.
- 2: GNSS - GNSS antenna connector.
- 3: BT - Bluetooth antenna connector (if applicable).
- 4: Micro USB - USB interface for data and power.
- 5: 2.54 Pin - Standard 2.54mm pitch pins for external connections.
- 6: Micro SIM - Micro SIM card slot.
- 7: INSIM - Internal SIM slot (not welded by default).
2.2 Power Supply
The module supports a wide voltage input range. Connect power via the Micro USB port or the VIN pins. Ensure your power supply meets the following requirements:
- USB Power: 5V DC
- VIN Pins: 5-16V DC
- Module Power Supply (VBAT): 3.4-4.2V (internal to the module, typically handled by the board's power management).
2.3 SIM Card Installation
Insert a Micro SIM card into the designated Micro SIM card slot (6). Ensure the card is inserted correctly according to the diagram on the board.
2.4 Antenna Connection
Connect the appropriate antennas to the IPEX 1 RF seats:
- MAIN (1): Connect the 4G FPC antenna for LTE/2G communication.
- GNSS (2): Connect the GPS FPC antenna for GNSS functionality.
- BT (3): Connect a Bluetooth antenna if Bluetooth functionality is required.
2.5 Interfacing
The module offers various interfaces for communication with a host microcontroller or PC:
- UART: The default UART interface operates at 3.3-4.3V TTL levels. This can be changed to 5V if needed. Connect TXD, RXD, RTS, CTS, GND, and PEN pins to your microcontroller. For basic applications, only VIN, GND, PEN, TXD, and RXD are typically required.
- USB: The Micro USB port (4) can be used for data communication, including RNDIS or PPP dial-up internet access.
- 2.54mm Pins: The 23PIN 2.54mm pitch pins (5) are provided for direct integration into custom PCBs or for connecting to XH2.54 terminals for remote data transmission.
3. Operating Instructions
Once the hardware is set up, the module can be controlled via AT commands sent over the UART or USB interface. Refer to the SIMCOM A7670C AT Command Manual for detailed command sets.
3.1 Initial Power-Up
- Ensure all connections (power, SIM, antennas) are secure.
- Apply power to the board. The Power/Network LED will illuminate.
- Observe the Network Status LED. It will blink to indicate network registration status.
3.2 Network Connectivity (LTE Cat1 / 2G)
The module supports LTE Cat1 and 2G networks. It will automatically attempt to register with an available network. Use AT commands to check network registration status, signal quality, and initiate data connections (e.g., GPRS, LTE).
3.3 GNSS (GPS) Functionality
With the GPS FPC antenna connected, the module can acquire GNSS data. Use specific AT commands to enable GNSS, query location data, and configure GNSS settings.
3.4 Voice Calls
The module supports voice calls. Connect a microphone and speaker to the analog voice pins (MIC_N, MIC_P, SPK_N, SPK_P) and use AT commands to make or receive calls.
3.5 Network Protocols
The module supports various network protocols, including TCP/IP, IPv4/IPv6, Multi-PDP, FTP, FTPS, HTTP, HTTPS, and DNS, enabling diverse internet communication applications.
4. Specifications
| Parameter | Description |
|---|---|
| Product Name | 4G CAT1 Core Board |
| Model | CC-MCore-A7670C-MANS |
| Package | 23PIN (2.54mm) |
| Power | USB, 5-16V DC |
| UART | 3.3-4.3V TTL (Default) |
| Antenna Interface | IPEX 1 |
| SIM Card | MIRCO SIM |
| LED | Power/Network light |
| USB | Yes |
| Size | 44.45 × 31.75 × 12.44 mm (including pin height) |
| Operating Temperature | -40°C to 85°C |
| Network Band | TDD-LTE: B34/B38/B39/B40/B41 FDD-LTE: B1/B3/B5/B8 GSM/GPRS/EDGE: 900/1800 MHz |
| Network Speed | LTE: 10Mbps (DL), 5Mbps (UL) GPRS: 85.6kbps |
| Network Protocol | TCP/IP/IPV4/IPV6/Multi-PDP/FTP/FTPS/HTTP/HTTPS/DNS |
| Function | LTE CAT1 + 2G + GNSS + Voice |
5. Hardware Characteristics
The A7670C-MANS Core Board is designed with several key hardware features to ensure robust and flexible operation:
- Integrated Power Supply: Simplifies power management for the module.
- MIRCO SIM Holder + INSIM: Supports both external Micro SIM cards and an internal SIM (INSIM, 5*6 design, not soldered by default).
- Level Conversion Circuit: Ensures compatibility with different voltage levels for the UART interface (default 3.3V TTL, changeable to 5V).
- Wide Voltage Support: Operates with DC 5-16V input, meeting power requirements for various devices.
- IPEX 1 RF Seat: Provides easy installation for external antennas.
- 23PIN 2.54mm Pins: Standard pin headers for flexible integration, compatible with DIY XH2.54 terminals.
- Micro USB: Enables USB communication for RNDIS or PPP dial-up internet access.
5.1 Multi-Protection Features
The board incorporates multiple protection mechanisms to ensure stable and reliable operation:
- SIM Card Protection: Safeguards the SIM card from electrical damage.
- Power Supply Protection: Protects against voltage fluctuations and overcurrent.
- Pin TVS Protection: Transient Voltage Suppression for I/O pins.
- USB Protection: Shields the USB interface from electrical hazards.
- Antenna TVS Protection: Protects the RF front-end from static discharge and surges.
6. Pin Description
Understanding the pinout is crucial for integrating the A7670C-MANS Core Board into your application. The following table and diagram detail the function of each pin.
| Pin Name | Function |
|---|---|
| SC | Analog voice MIC_N |
| SD | Analog voice MIC_P |
| SR | Analog voice SPK_N |
| SV | Analog voice SPK_P |
| STA | Power-on status indication |
| TXD | Master serial transmission |
| RXD | Master serial reception |
| RTS | Main serial RTS input |
| PEN | The onboard power supply is enabled |
| P/R | Module switch control |
| GND | Power input - Ground |
| P/G | Default to GND |
| VEXT | Internal 1.8V power output |
| VTTL | External reference level input |
| CTS | Main serial port CTS output |
| RI | Ringing indication |
| DTR | Sleep wake pin |
| TXD2 | Serial port 2 Send |
| RXD2 | Serial port 2 reception |
| VBAT | Module power supply 3.4-4.2V input |
| NET | Network status indication |
| VIN | Power supply positive 5-16V input |
Note: For regular applications, you typically only need to connect VIN, GND, PEN, TXD, and RXD.
7. Maintenance
To ensure the longevity and optimal performance of your A7670C-MANS Core Board, follow these maintenance guidelines:
- Keep Clean: Regularly clean the board with a soft, dry brush or compressed air to remove dust and debris. Avoid using liquids.
- Proper Storage: Store the module in an anti-static bag in a cool, dry environment when not in use.
- Handle with Care: Electronic components are sensitive to electrostatic discharge (ESD). Always use ESD-safe practices when handling the board.
- Firmware Updates: Check the manufacturer's website for any available firmware updates to improve performance or address issues.
8. Troubleshooting
If you encounter issues with your A7670C-MANS Core Board, consider the following troubleshooting steps:
- No Power:
- Verify the power supply voltage is within the 5-16V DC range.
- Check all power connections, including USB and VIN pins.
- Ensure the PEN pin is correctly enabled if using external power control.
- No Network Registration:
- Confirm the SIM card is correctly inserted and active.
- Check the antenna connection to the MAIN IPEX port.
- Ensure you are in an area with network coverage for LTE Cat1 or 2G.
- Use AT commands to check network status (e.g.,
AT+CREG?,AT+CSQ).
- GNSS Not Working:
- Verify the GPS FPC antenna is securely connected to the GNSS IPEX port.
- Ensure the module has a clear view of the sky for satellite acquisition.
- Use AT commands to enable GNSS and check status.
- UART Communication Issues:
- Check TXD/RXD connections and ensure they are not swapped.
- Verify the baud rate and other serial port settings match between the module and your host device.
- Confirm TTL voltage levels are compatible (3.3V or 5V).
9. User Tips
Based on general usage patterns for similar modules, here are some tips:
- Antenna Placement: For optimal signal strength, position antennas away from metal objects and other electronic interference.
- Power Stability: Use a stable and adequately rated power supply to prevent unexpected module resets or malfunctions.
- Software Development: Utilize the provided drivers, module firmware, and STM code (if available) to accelerate your application development.
- Documentation: Always refer to the official SIMCOM A7670C AT Command Manual and hardware design guides for in-depth technical details and advanced configurations.
No specific user tips were available from customer reviews or Q&A for this product at the time of manual creation.
10. Warranty and Support
For technical support, detailed documentation, or warranty inquiries, please contact the manufacturer or your point of purchase. Ensure you have your product model number (A7670C-MANS) and any relevant purchase information ready.
SIMCOM provides FAE (Field Application Engineer) online support during China time working hours.
