Low-frequency semiconductor RFID multi-channel read-write device capable of switching signal intensity

Abstract

The utility model discloses a low-frequency semiconductor RFID multichannel read-write device capable of switching signal intensity in the technical field of radio frequency identification, which comprises a radio frequency circuit, the radio frequency circuit is connected with a plurality of adjustable switching circuits, the adjustable switching circuits are connected with an antenna, and the antenna is correspondingly connected with a radio frequency tag. And the adjustable switching circuit is responsible for generating a carrier signal and performing FSK modulation and demodulation, and the adjustable switching circuit enhances the transmission capability of a radio frequency signal and supports dual-voltage switching, so that the dynamic adjustment of a read-write distance is realized. The read-write distance is flexibly adjusted to meet the requirements of different application scenes, the multi-antenna adjustable switching circuit can be simplified, and the use of peripheral devices is reduced while the transmission stability of radio-frequency signals is ensured.

Description

Technical Field

[0001] The utility model relates to a low-frequency semiconductor RFID multi-channel reading and writing device capable of switching signal strength in the technical field of radio frequency identification. Background Art

[0002] With the rapid development of smart manufacturing, 134.2kHz low-frequency RFID (RFID) technology has gained widespread adoption as a key traceability tool in the semiconductor industry. Industrial-grade RFID tags encapsulated in glass tubes, such as the Texas Instruments RI-TRP-DR2B series, offer high-capacity 1360-bit storage, FSK dual-frequency modulation, multi-page storage architecture, and enhanced CRC (Correction Code) checking. In semiconductor wafer manufacturing, these anti-static, high-temperature, and corrosion-resistant RFID tags enable real-time tracking and intelligent management of wafer cassettes (FOUPs). They not only record key wafer process parameters, batch numbers, and process indicators, but also enable rapid wireless data access within cleanrooms, significantly improving fab production efficiency and yield control. However, existing 134.2kHz RFID readers and writers on the market suffer from poor read / write range adjustability. Some scenarios require a longer read distance, while others require precise, close-range reading, making them difficult to meet diverse application requirements. Utility Model Content

[0003] The purpose of this utility model is to provide a low-frequency semiconductor RFID multi-channel reader and writer with switchable signal strength, which can realize flexible adjustment of the reading and writing distance to adapt to the requirements of different application scenarios, and simplify the adjustable switching circuit of multiple antennas, thereby ensuring the stability of radio frequency signal transmission while reducing the use of peripheral devices.

[0004] To achieve the above objectives, the utility model provides a low-frequency semiconductor RFID multi-channel reading and writing device with switchable signal strength, including a radio frequency circuit, the radio frequency circuit is connected to multiple adjustable switching circuits, the adjustable switching circuit is connected to an antenna, and the antenna is correspondingly connected to a radio frequency tag.

[0005] Compared with existing technologies, the present invention offers the following advantages: the carrier signal is generated and FSK modulation and demodulation are performed. The adjustable switching circuit enhances RF signal transmission capabilities and supports dual-voltage switching, thereby enabling dynamic adjustment of read / write distances. This flexible adjustment of read / write distances accommodates diverse application scenarios and simplifies the adjustable switching circuitry for multiple antennas, ensuring RF signal transmission stability while reducing the need for peripheral components.

[0006] As a further improvement of the present utility model, the radio frequency circuit includes a chip TMS3705, a resistor R4 is connected between pin 1 and pin 2 of the chip TMS3705, pin 1, pin 5 and pin 7 of the chip TMS3705 are connected to the adjustable switching circuit, pin 6, pin 12 and pin 13 of the chip TMS3705 are grounded, pin 8, pin 9 and pin 15 of the chip TMS3705 are connected to a 5V power supply, pin 8 of the chip TMS3705 is also grounded via a capacitor C9, and capacitors C12 and C9 are connected in parallel at both ends. Capacitor C5, crystal oscillator X1 is connected between pins 10 and 11 of chip TMS3705, crystal oscillator X1 is grounded, pin 14 of chip TMS3705 is connected to the host computer via resistor R6, pin 16 of chip TMS3705 is connected to one end of resistor R5, the other end of resistor R5 is connected to the host computer via resistor R8, pin 15 of chip TMS3705 is connected to one end of resistor R7, the other end of resistor R7 is respectively connected to the other end of resistor R5 and one end of capacitor C6, and the other end of capacitor C6 is grounded.

[0007] In this way, the chip TMS3705, as a read-write controller, uses FSK modulation with a frequency of 134.2kHz. It receives instructions from the host computer and is responsible for generating the carrier signal.

[0008] As a further improvement of the present utility model, the adjustable switching circuit includes a chip UCC27424D, pins 1 and 8 of the chip UCC27424D are connected to the host computer, pins 5 and 7 of the chip UCC27424D are connected to the socket P1 through the filtering and noise reduction circuit, the socket P1 is connected to the antenna, pins 2 and 4 of the chip UCC27424D are respectively connected to pins 5 and 7 of the chip TMS3705, pin 3 of the chip UCC27424D is grounded, pin 6 of the chip UCC27424D is connected to pin 2 of the power socket H2, and pins 1 and 3 of the power socket H2 are connected to a 5V power supply and a 12V power supply, respectively.

[0009] In this way, the host computer sends a high level to the two enable pins 1 (ENBA) and 8 (ENBB) of UCC27424D, so that multiple antennas can be switched. Moreover, by switching the 5V power supply and the 12V power supply, the working voltage of the chip UCC27424D can be switched, which can realize the switching of different reading and writing distances.

[0010] As a further improvement of the present invention, the filtering and noise reduction circuit includes a resistor R1, one end of the resistor R1 is connected to pin 5 of the chip UCC27424D, the other end of the resistor R1 is respectively connected to one end of the capacitor C2, one end of the capacitor C10 and one end of the VTS diode D2, the other end of the capacitor C2 is grounded, the other end of the capacitor C10 is respectively connected to one end of the resistor R10 and pin 2 of the socket P1, the two ends of the capacitor C10 are connected in parallel with a resistor R9, pin 1 of the socket P1 is connected to one end of the resistor R11, and the other end of the resistor R11 is respectively connected to the resistor The other end of R10 is connected to one end of the resistor R3, and resistor R12 is connected in parallel at both ends of the resistor R11. The other end of the resistor R3 is connected to pin 1 of the chip TMS3705. One end of the resistor R3 is connected to one end of the VTS diode D1 via the capacitor C11. The other end of the VTS diode D1 is connected to the other end of the VTS diode D2 and grounded. One end of the VTS diode D1 is respectively connected to one end of the capacitor C3 and one end of the resistor R2. The other end of the capacitor C3 is grounded. The other end of the resistor R2 is connected to pin 7 of the chip UCC27424D.

[0011] This combination of capacitors provides filtering, effectively suppressing high-frequency noise and interference signals, while the diodes form a clamping circuit that limits the input amplitude and protects the subsequent circuits, preventing the signal from exceeding the power supply voltage range. The overall system forms a stable and reliable RF front-end system. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 This is a principle block diagram of the utility model.

[0013] Figure 2 This is the radio frequency circuit diagram of the utility model.

[0014] Figure 3 This is the adjustable switching circuit diagram of the utility model. DETAILED DESCRIPTION

[0015] The present invention is further described below with reference to the accompanying drawings:

[0016] like Figure 1-3 The low-frequency semiconductor RFID multi-channel reading and writing device with switchable signal strength shown includes a radio frequency circuit connected to multiple adjustable switching circuits, the adjustable switching circuit is connected to an antenna, and the antenna is correspondingly connected to a radio frequency tag.

[0017] The RF circuit includes a chip TMS3705. A resistor R4 is connected between pins 1 and 2 of the chip TMS3705. Pins 1, 5, and 7 of the chip TMS3705 are connected to an adjustable switching circuit. Pins 6, 12, and 13 of the chip TMS3705 are grounded. Pins 8, 9, and 15 of the chip TMS3705 are connected to a 5V power supply. Pin 8 of the chip TMS3705 is also grounded via a capacitor C9. Capacitors C12 and C5 are connected in parallel at both ends of the capacitor C9. A crystal oscillator X1 is connected between pins 10 and 11 of TMS3705, and crystal oscillator X1 is grounded. Pin 14 of chip TMS3705 is connected to the host computer via resistor R6. Pin 16 of chip TMS3705 is connected to one end of resistor R5, and the other end of resistor R5 is connected to the host computer via resistor R8. Pin 15 of chip TMS3705 is connected to one end of resistor R7, and the other end of resistor R7 is respectively connected to the other end of resistor R5 and one end of capacitor C6, and the other end of capacitor C6 is grounded.

[0018] The adjustable switching circuit includes a chip UCC27424D. Pins 1 and 8 of the chip UCC27424D are connected to the host computer. Pins 5 and 7 of the chip UCC27424D are connected to the socket P1 through a filtering and noise reduction circuit. The socket P1 is connected to the antenna. Pins 2 and 4 of the chip UCC27424D are respectively connected to pins 5 and 7 of the chip TMS3705. Pin 3 of the chip UCC27424D is grounded. Pin 6 of the chip UCC27424D is connected to pin 2 of the power socket H2. Pins 1 and 3 of the power socket H2 are respectively connected to a 5V power supply and a 12V power supply.

[0019] The filtering and noise reduction circuit includes a resistor R1, one end of which is connected to pin 5 of the chip UCC27424D, and the other end of which is connected to one end of the capacitor C2, one end of the capacitor C10, and one end of the VTS diode D2. The other end of the capacitor C2 is grounded, and the other end of the capacitor C10 is connected to one end of the resistor R10 and pin 2 of the socket P1. Resistor R9 is connected in parallel to both ends of the capacitor C10, and pin 1 of the socket P1 is connected to one end of the resistor R11. The other end of the resistor R11 is connected to the other end of the resistor R10. And one end of the resistor R3 is connected, both ends of the resistor R11 are connected in parallel with resistor R12, the other end of the resistor R3 is connected to pin 1 of the chip TMS3705, one end of the resistor R3 is connected to one end of the VTS diode D1 through the capacitor C11, the other end of the VTS diode D1 is connected to the other end of the VTS diode D2 and grounded, one end of the VTS diode D1 is respectively connected to one end of the capacitor C3 and one end of the resistor R2, the other end of the capacitor C3 is grounded, and the other end of the resistor R2 is connected to pin 7 of the chip UCC27424D.

[0020] In this utility model, the RF chip TMS3705 serves as the read / write controller, with a modulation scheme of FSK at a frequency of 134.2kHz. The driver chip UCC27424D is used for signal amplification and antenna channel selection, with a switchable drive voltage of 5V / 12V. Operating voltage configurations include: Standard mode: 5V power supply, read distance of 20-50mm; write distance of 20-50mm; Enhanced mode: 12V power supply, read distance of 20-80mm; write distance of 20-80mm. Pin 1 of socket H2 connects to a 5V power supply, and pin 3 connects to a 12V power supply. Depending on the actual situation, either pin 1 or pin 3 is connected to select standard or enhanced mode.

[0021] Since the RF chip TMS3705 can be connected to multiple chips UCC27424D, and each chip UCC27424D is connected to one antenna, after the two enable pins ENBA and ENBB of UCC27424D are connected in series, the host computer outputs a high level to these two enable pins to turn on the antenna of that road, and when the host computer outputs a low level, the antenna of that road cuts off the communication, thereby realizing the switching use of each antenna.

[0022] The UCC27424D chip is connected to socket P1 through a filtering and noise reduction circuit, and then to the 422uH antenna through socket P1. The combination of R9 and C10 in the filtering and noise reduction circuit separates the RF signal from the DC component: C10 acts as an isolation capacitor, blocking the DC while allowing the RF signal to pass, while R9 provides a DC bias path for the RF signal. C11 sets the core resonance frequency, while R10 controls the antenna's Q factor through its damping effect. Bidirectional diodes D1 and D2 provide clamping protection to prevent overvoltage damage. To improve electromagnetic compatibility (EMC) performance, the circuit incorporates C2 and C3 as electromagnetic interference (EMI) suppression capacitors, working in conjunction with R1 and R2 for impedance matching and noise attenuation. R11 provides impedance matching and current limiting. In this way, the combination of C10 and C11 provides a filtering effect, which can effectively suppress high-frequency noise and interference signals, while the clamping circuit composed of diodes D1 and D2 limits the input amplitude and protects the subsequent circuit to prevent the signal from exceeding the power supply voltage range. The whole constitutes a stable and reliable RF front-end circuit, which makes the reading and transmission of RF signals stable and highly anti-interference, ensuring the accuracy of the read data.

[0023] The utility model has the characteristics of low cost, flexible function and simple structure. It can realize flexible adjustment of reading and writing distance to adapt to the requirements of different application scenarios, and can simplify the design of multi-channel antenna switching circuits. While ensuring the stability of radio frequency signal transmission, it reduces the use of peripheral devices and ensures that the read glass tube tag data is reliable and accurate.

[0024] The present invention is not limited to the above-mentioned embodiments. On the basis of the technical solution disclosed herein, technicians in this field can make some substitutions and deformations of some technical features therein according to the disclosed technical content without creative labor, and these substitutions and deformations are all within the protection scope of the present invention.

Claims

1. A low-frequency semiconductor RFID multi-channel reading and writing device with switchable signal strength, characterized in that: It includes a radio frequency circuit, which is connected to multiple adjustable switching circuits. The adjustable switching circuit is connected to an antenna, and the antenna is correspondingly connected to a radio frequency tag.

2. The low-frequency semiconductor RFID multi-channel reader / writer with switchable signal strength according to claim 1, characterized in that: The RF circuit includes a chip TMS3705. A resistor R4 is connected between pins 1 and 2 of the chip TMS3705. Pins 1, 5, and 7 of the chip TMS3705 are connected to an adjustable switching circuit. Pins 6, 12, and 13 of the chip TMS3705 are grounded. Pins 8, 9, and 15 of the chip TMS3705 are connected to a 5V power supply. Pin 8 of the chip TMS3705 is also grounded via a capacitor C9. Capacitors C12 and C5 are connected in parallel at both ends of the capacitor C9. A crystal oscillator X1 is connected between pins 10 and 11 of TMS3705, and crystal oscillator X1 is grounded. Pin 14 of chip TMS3705 is connected to the host computer via resistor R6. Pin 16 of chip TMS3705 is connected to one end of resistor R5, and the other end of resistor R5 is connected to the host computer via resistor R8. Pin 15 of chip TMS3705 is connected to one end of resistor R7, and the other end of resistor R7 is respectively connected to the other end of resistor R5 and one end of capacitor C6, and the other end of capacitor C6 is grounded.

3. The low-frequency semiconductor RFID multi-channel reader / writer with switchable signal strength according to claim 2, characterized in that: The adjustable switching circuit includes a chip UCC27424D. Pins 1 and 8 of the chip UCC27424D are connected to the host computer. Pins 5 and 7 of the chip UCC27424D are connected to the socket P1 through a filtering and noise reduction circuit. The socket P1 is connected to the antenna. Pins 2 and 4 of the chip UCC27424D are respectively connected to pins 5 and 7 of the chip TMS3705. Pin 3 of the chip UCC27424D is grounded. Pin 6 of the chip UCC27424D is connected to pin 2 of the power socket H2. Pins 1 and 3 of the power socket H2 are respectively connected to a 5V power supply and a 12V power supply.

4. The low-frequency semiconductor RFID multi-channel reader / writer with switchable signal strength according to claim 3, characterized in that: The filtering and noise reduction circuit includes a resistor R1, one end of which is connected to pin 5 of the chip UCC27424D, and the other end of which is connected to one end of the capacitor C2, one end of the capacitor C10, and one end of the VTS diode D2. The other end of the capacitor C2 is grounded, and the other end of the capacitor C10 is connected to one end of the resistor R10 and pin 2 of the socket P1. Resistor R9 is connected in parallel to both ends of the capacitor C10, and pin 1 of the socket P1 is connected to one end of the resistor R11. The other end of the resistor R11 is connected to the other end of the resistor R10. And one end of the resistor R3 is connected, both ends of the resistor R11 are connected in parallel with resistor R12, the other end of the resistor R3 is connected to pin 1 of the chip TMS3705, one end of the resistor R3 is connected to one end of the VTS diode D1 through the capacitor C11, the other end of the VTS diode D1 is connected to the other end of the VTS diode D2 and grounded, one end of the VTS diode D1 is respectively connected to one end of the capacitor C3 and one end of the resistor R2, the other end of the capacitor C3 is grounded, and the other end of the resistor R2 is connected to pin 7 of the chip UCC27424D.

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