1. Introduction
The SIMCom A7608SA-H is an LTE Cat 4 module designed for wireless communication. It supports various network modes including LTE-TDD, LTE-FDD, HSPA+, GSM, GPRS, and EDGE. This module offers a maximum downlink rate of 150Mbps and an uplink rate of 50Mbps.
The A7608SA-H utilizes an LCC+LGA form factor, ensuring compatibility with SIM5320/SIM5360 series (UMTS/HSPA+ modules) and SIM7600/SIM7600-H series (LTE modules). This design facilitates seamless migration from 3G to LTE products and supports flexible product development.
This manual provides essential information for the safe and effective use of the A7608SA-H module.
2. Safety & Warnings
- This is an industrial electronic component, not a toy. Keep out of reach of children under 3 years.
- Risk of short circuit. Do not use in wet, humid, dusty, or high-voltage environments.
- Do not disassemble, modify, or rework the module without authorization; doing so will void the warranty.
- Use only within the specified voltage range (3.4V-4.2V DC) to avoid overheating, fire, or burn hazards.
- Not for use in medical equipment, aviation, life support, or safety-critical systems.
3. Package Contents
The standard package includes:
- 1x BK-A7608SA-H Module
- 1x 4G/NB Antenna (may be flexible or PCB type depending on variant)
- 1x GPS Antenna (may be FPC or PCB type depending on variant)
4. Setup Instructions
- Preparation: Before installation, carefully inspect the module for any visible damage.
- Antenna Installation: Connect the 4G antenna to the 'MAIN' RF port and the GNSS (GPS) antenna to the 'GPS' RF port on the module.
- SIM Card Installation: Insert a Nano SIM card into the SIM card slot on the module, ensuring it is correctly oriented and securely seated.
- Power Supply: Provide a stable DC power input between 3.4V and 4.2V to the VCC pin. A 5.0V supply is recommended for the breakout board.
- Host System Connection: Link the module to your host system (e.g., PC, microcontroller) via the UART or USB interface.
5. Operation
5.1 Power On and Network Registration
Once power is supplied, the module will automatically initialize and register with the network. The GREEN LED indicator blinking signifies successful network registration.
5.2 AT Commands
The module is controlled by sending standard AT commands. These commands enable functionalities such as dial-up, positioning, and data transmission. The AT commands of the A7608SA-H are compatible with SIM7600 series modules.
5.2.1 Pin Definition for 6-pin Connector
The 6-pin connector provides essential interfaces for communication and control. Note that the VCC range is from 5.0V to 10V, with 5.0V being recommended. The RXD/TXD pins operate at a 3.3V TTL level, which can be directly connected with 3.3V MCUs.
| Pin Name | Pin Number | Mark on PCB | Description | Comment |
|---|---|---|---|---|
| SLEEP | 0 | N | Not connected | |
| GND | 1, 6 | G | GND | |
| VCC | 2 | V | The power supply | 5V-10V |
| PWRKEY | 3 | K | Power on/off the module | Shorted with GND via R104 by default |
| TXD | 4 | T | Output, Transmit Data | TTL Series data Output, 3.3V logic level |
| RXD | 5 | R | Input, Receive Data | TTL Series data Input, 3.3V logic level |
5.2.2 Testing via UART
To test the BK-A7608 via UART, open a serial software (e.g., sscom32E.exe), select the correct serial number and a Baud rate of 115200bps. Ensure 'SendNew' is selected to send AT commands.
5.2.3 Testing via USB
To test the BK-A7608 via USB, remove all connections on the CN101 7-pin connector. Power up the A7608 Breakout board only via USB. Install the "SIMCom_Windows 1803 USB Virtual COM port driver.zip" driver. Then, in your serial software, select AT Port 9001, 115200bps, and 'SendNew' to send commands.
6. Maintenance & Storage
6.1 Handling
Do not drop, bend, or apply strong pressure to the module to prevent damage to components or connections.
6.2 Cleaning
Always power off the module before cleaning. Use only a dry, antistatic cloth to clean the module.
6.3 Storage
Store the module in a dry, ventilated, and non-corrosive environment.
- Operating Temperature: -40°C to +85°C
- Storage Temperature: -40°C to +90°C
- Humidity: 5% to 95% (non-condensing)
7. Technical Specifications
| Feature | Description |
|---|---|
| Type | Module |
| Form Factor | LCC+LGA |
| Network Support | LTE Cat 4, UMTS, GSM |
| LTE-TDD Bands | B38/B40/B41 |
| LTE-FDD Bands | B1/B2/B3/B4/B5/B7/B8/B20/B28/B66 |
| UMTS/HSPA+ Bands | B1/B2/B5/B8 |
| GSM/GPRS/EDGE Bands | 850/900/1800/1900 MHz |
| Downlink Rate (Max) | 150Mbps |
| Uplink Rate (Max) | 50Mbps |
| Interfaces | UART, USB2.0 |
| Power Input | 3.4V-4.2V DC (5.0V recommended for breakout board) |
| Dimensions (PCBA) | 40mm x 40mm |
| Operating Temperature | -40°C to +85°C |
8. Troubleshooting
8.1 Network Connectivity Issues
- No Network Registration: If the GREEN LED is not blinking after power-on, ensure the SIM card is correctly inserted and active, and that antennas are properly connected. Verify power supply voltage is within the 3.4V-4.2V range.
- Limited Functionality (e.g., no LTE/Voice Calls): Some users have reported that the module's operation may not allow for LTE or voice calls, even if the architecture suggests it should. This can sometimes be due to specific firmware versions that do not support these features. Check for updated firmware or consult SIMCom documentation for feature support on your specific module variant.
8.2 VoLTE Support
The module's support for VoLTE (Voice over LTE) depends on the specific firmware and network operator capabilities. If VoLTE is required, verify with your network provider and check the module's firmware documentation for compatibility.
9. User Tips
- Antenna Connection: Always ensure both the main 4G/NB antenna and the GPS antenna are securely connected to their respective ports for optimal performance.
- Power Supply Stability: Use a stable power supply within the recommended voltage range to prevent unexpected behavior or damage.
- Firmware Updates: If encountering issues with specific features like LTE or voice calls, check the manufacturer's website for potential firmware updates that might resolve these limitations.
10. Compliance Information
This product complies with the following EU directives:
- CE Mark (Height ≥ 5mm)
- RED Directive 2014/53/EU
- RoHS Directive 2011/65/EU
- EMC Standards
11. Disposal & Recycling
This product should not be disposed of as household waste. In accordance with the WEEE Directive (2012/19/EU), please dispose of it at a designated electronic waste recycling point to protect the environment and human health.
12. Manufacturer & Support
Manufacturer:
SIMCom Wireless Solutions Limited
SIMCom Headquarters Building, Building 3, No. 289 Linhong Road, Changning District, Shanghai P.R. China
EU Authorized Representative:
CET PRODUCT SERVICE SP. Z O.O.
UI. Dluga 33 102, Zgierz Łódzkie 95-100 Poland
Importer:
Donato di matteo
Cda rosciavizza 10, 66030, Mozzagrogna, Chieti, Abruzzo, Italy, 66030
For further support, please refer to the official SIMCom documentation or contact your vendor.