Simple comparison and description of the eight performances of the SL-RFMOD RF module and the U2270B
The SL-RFMOD RF module is a 125kHz universal read-write base station module that incorporates proprietary technology. It differs significantly from the U2270B in terms of usage, performance parameters, and application scenarios. This article provides a detailed comparison between the two products, focusing on electrical characteristics, application techniques, and reliability during real-world industrial production. The goal is to offer a practical reference for choosing an appropriate 125kHz RF card reading and writing solution.
1. Working Voltage:
The SL-RFMOD utilizes advanced wide-voltage circuit technology, allowing it to operate and read/write cards within a voltage range of 2.7V to 5.5V. In contrast, the U2270B only functions within a narrower range of 4.5V to 5.5V.
For example, in water meter applications, the SL-RFMOD’s low minimum operating voltage of 2.7V enables customers to use a single-cell lithium battery as a power source, ensuring stable operation without additional protection or conversion circuits. This voltage also aligns with the typical minimum operating voltages of popular microcontrollers like the M430 series, PIC series, and AVRMEGA48/88 series used in water meters.
If the U2270B is used instead, the system must operate at 5V or higher, increasing power consumption and reducing the effective voltage range of the battery. Battery discharge inconsistencies may lead to issues such as reduced lifespan. By using the SL-RFMOD, customers can design systems with a single high-efficiency lithium battery (or dual batteries), resulting in lower overall voltage, reduced power consumption, and extended battery life, thus lowering the operational cost of the water meter.
2. Clock Frequency:
The SL-RFMOD features an internal quartz crystal oscillator, providing a frequency error of less than 150PPM under normal conditions. On the other hand, the U2270B uses an internal RC oscillator, which has inferior stability and temperature coefficient compared to a crystal. As a result, the U2270B requires a frequency calibration resistor on the RF pin, which may need adjustment to achieve the desired output frequency. This adds complexity to the manufacturing process, as frequency testing and adjustment are required before the product leaves the factory.
The U2270B’s antenna drive circuit uses direct coupling, meaning that any mismatch between the external resonant tank and the internal clock frequency can cause changes in the actual transmit frequency. Variations in antenna winding consistency during mass production may lead to transmission frequency deviations, affecting card reading and writing performance.
In contrast, the SL-RFMOD employs a specially designed antenna drive circuit that compensates for errors caused by variations in the resonant capacitor and wound antenna. This allows for greater flexibility in selecting matching resonant circuits. Since the module’s frequency consistency is very high, there is no need to test and adjust frequency during mass production, improving efficiency. Additionally, the SL-RFMOD is less affected by environmental factors and card positioning, enhancing compatibility and reducing instability issues. Many customers previously experienced problems with card detection, but these have been significantly improved after switching to the SL-RFMOD.
3. Phase Noise Problem:
A critical issue often overlooked in RF card reading and writing is the suppression of phase noise from the base station. Due to its internal clock source design and potential external antenna mismatches, the U2270B may introduce phase noise along with data output, causing illegal pulse hopping in the data stream and reducing decoding efficiency. When no card is present, random pulse signals may appear on the data output port, mixing with the actual card signal and leading to decoding errors.
The SL-RFMOD addresses this issue through a specialized modulation and demodulation circuit, effectively eliminating phase noise interference. With proper antenna transmit power (60V–70V), phase noise can be completely suppressed, allowing the data output port to accurately reflect the card's waveform. Even without a card, the output remains stable, significantly reducing error rates and improving card reading efficiency.
This improvement leads to shorter transaction times and reduced system power consumption. A more stable and reliable system also lowers the requirements for matching antennas, cards, and modules, enhancing overall system compatibility and mass production reliability.
4. Data Bandwidth:
The SL-RFMOD supports a wider data bandwidth, enabling faster and more accurate data transfer. This makes it particularly suitable for applications requiring high-speed communication and reliable performance. Compared to the U2270B, which may suffer from limited bandwidth and slower response times, the SL-RFMOD ensures smoother and more efficient data exchange, especially in environments where multiple cards are being read simultaneously. Its enhanced bandwidth also contributes to better signal integrity and reduced latency, making it ideal for industrial and commercial applications where performance and reliability are crucial.
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Jiangsu Yunbo Intelligent Technology Co., Ltd , https://www.fmodel-ai.com