Second Gen: 125 kHz RFID DIP Module for proximity card applications with RS232 Interface
The SM125-M2-232 is a 28-pin DIP type module, highly integrated RFID reader module for the 125 kHz frequency. It combines a low power ARM® Cortex® microcontroller, analog circuitry, and an antenna driver in a compact package This module is designed to provide OEMs with a reliable, cost-effective solution for embedding RFID functionality into their products, offering ease of integration and robust performance across a wide range of RFID proximity card applications.
The SM125-M2-232 is identical to the SM125-M2 module, but it also includes an ST232 IC (RS232 driver chip) on the bottom side of the module.
As with all second-generation 125 kHz RFID modules, this module can be controlled via UART-RS232/I2C or can autonomously read compatible tags without external intervention. It manages all analog and digital signal processing, preparing tag data for transmission over UART/RS232/I2C/Wiegand interfaces. Furthermore, it can trigger Buzzer/LED/Relay circuits based on configurable parameters.
The SM125-M2-232 succeeds the first-generation SM125-M1-232 module. The M1 utilized Sonmicro's pioneering System-on-Chip (SoC) based RFID IC, the SM125-IC. The SM125-M2-232 embodies years of continuous improvement and proprietary technologies developed by Sonmicro.
It maintains compatibility with the first-generation SM125-M1-232's functionality, communication interface, and command set, making it an ideal successor for existing designs.
Alternative Form Factors
SM125-M2-232 is a 28-pin DIP type module, ideal for applications requiring a through-hole mounting option.
Compatibility and Migration
The SM125-M2-232 is pin-to-pin compatible with the first-generation SM125-M1-232 module, ensuring a seamless transition for existing designs. However, both the SM125-M1-232 and SM125-M2-232 are exclusively offered for existing designs. For new projects, we recommend exploring the SM1250B-MINI (MINI20 package) and SM1251-SMD (SMD20 package) 125 kHz RFID modules. While the SM125-M1-232 and SM125-M2-232 remain available for existing customers, we encourage the adoption of new package type modules for future designs to leverage the latest advancements in manufacturing and availability.SM1251-SMD
For surface-mount applications, consider the SM1251-SMD module, which offers the same functionality as the SM125-M2 but in a surface-mount form factor, ideal for automated assembly processes.Note that the SM1251-SMD does not include the RS232 interface.
SM1250B-MINI
For plug-and-play usage, the SM1250-MINI features 2.0 mm pitch low-profile pin headers, making it easy to integrate into your existing designs with compatible sockets on the motherboard. Functionalities are identical to the SM125-M2, with the only difference being the form factor.Note that the SM1251-SMD does not include the RS232 interface.
Tailored for Proximity Card Applications
The SM125-M2-232 module is designed for compatibility with a variety of transponders, including Atmel/Temic T55xx and the widely used EM4100/02. It supports both Manchester RF/32 and Manchester RF/64 modulations. Engineered for simplicity, it requires only an antenna and a power supply to function effectively. The module automatically demodulates and decodes RF signals, preparing the actual tag data for immediate use.
Compact and Complete
Includes all necessary components for a 125 kHz RFID reader, except the antenna.Automatic Functionality
Independently performs all necessary signal processing; no external controller required.Flexible Interfaces
Offers UART/RS232 (up to 115200bps @5V) and I2C (up to 400KHz) communication options.Customizable Outputs
Features controllable General Purpose Outputs and Inputs, with a programmable Wiegand 26-bit output format.Firmware Flexibility
The module's firmware is upgradeable to accommodate custom-specific applications, enhancing its adaptability to future needs.Application-Driven Design
Ideal for embedding into products such as access control systems, the SM125-M2-232 supports a wide array of applications due to its powerful features. It is particularly suited for designers seeking to integrate RFID functionalities without the bulk or complexity of traditional designs.
Advanced Features and Benefits
Power Supply
Unlike the SM125-M2, which can operate with a 3.3V or 5V power supply, the SM125-M2-232 is recommended to use a 5V power supply when working at higher RS232 baud rates.
Future-Proof Design with Integrated Bootloader
The SM125-M2-232 features a built-in bootloader, a valuable tool for keeping your device up to date. This bootloader allows for:
Easy firmware updates
Ensures your device benefits from the latest features and performance improvements.Custom firmware development:
Enables you to tailor the module's functionality to your specific application needs.Plug-and-Play Installation
Effortless Setup
The SM125-M2-232 features convenient standard 2.54mm pin headers that allow for simple plug-and-play installation when used with standard pin sockets. This eliminates the need for soldering, saving you time and effort during assembly.Surface Mount Option Available
If your project requires surface mounting, consider the SM1251-SMD module, a variation designed for automated assembly processes.Note that the SM1251-SMD does not include the RS232 interface.
Advanced Customization Options
We offer customization services tailored to meet specific project needs, from custom firmware development to complete system design. Whether adjusting form factors, antenna designs, or integration protocols, our goal is to ensure that the SM125-M2-232 not only meets but exceeds your project requirements.
Contact us today to explore how the 125 kHz RFID modules and solutions can enhance your product offerings with its advanced features, reliability, and scalability.
