CN213904896U

CN213904896U - LED receiving card crystal oscillator application circuit and device

Info

Publication number: CN213904896U
Application number: CN202023094539.8U
Authority: CN
Inventors: 王星辰; 谢志君
Original assignee: Shenzhen Huidu Technology Co ltd
Current assignee: Shenzhen Huidu Technology Co ltd
Priority date: 2020-12-21
Filing date: 2020-12-21
Publication date: 2021-08-06
Anticipated expiration: 2030-12-21

Abstract

The utility model discloses a LED receiving card crystal oscillator application circuit, the circuit includes chip PHYA, chip PHYB, chip FPGA and passive crystal oscillator Y1, passive crystal oscillator Y1 is connected with chip PHYA, chip PHYA is connected with chip PHYB, chip PHYB is connected with chip FPGA; one end of the passive crystal oscillator Y1 is connected with a pin 5 of the chip PHYA, and the other end of the passive crystal oscillator Y1 is connected with a pin 4 of the chip PHYA. The utility model discloses an external passive crystal oscillator Y1 of 25M at chip PHYA, chip PHYA can normally work, chip PHYB is provided to pin 23 output 25M clock of chip PHYA, because the level problem, reduce the level of output through resistance partial pressure, chip PHYB can normally work this moment, chip FPGA is given to chip PHYB output 25M clock on the same reason, chip FPGA can normally work, thereby realize reducing crystal oscillator quantity, reach reduce cost's effect.

Description

LED receiving card crystal oscillator application circuit and device

Technical Field

The utility model belongs to the technical field of the LED receiving card, in particular to LED receiving card crystal oscillator application circuit and device.

Background

At present, LED display screens are widely applied, and can be used for arranging large display screens on building outer walls or building large electronic billboards by using the LED display screens.

When the LED display screen is used, the LED receiving card is indispensable hardware equipment, the LED receiving card can acquire videos or other data to be displayed sent to the LED sending card, and the LED display screen is controlled to display the videos or other data to be displayed according to the received data.

The existing LED receiving card needs to use 3 crystal oscillators, namely a PHYA part, a PHYB part and an FPGA part, so that not only is a large amount of PCB space occupied, but also the cost is higher.

Therefore, a circuit and a device for applying a crystal oscillator to an LED receiving card are needed to solve the above-mentioned problems.

SUMMERY OF THE UTILITY MODEL

To the above problem, the utility model provides a LED receives card crystal oscillator application circuit and device to solve the problem that proposes in the above-mentioned background art.

In order to achieve the above object, the utility model provides a following technical scheme: a crystal oscillator application circuit of an LED receiving card comprises a chip PHYA, a chip PHYB, a chip FPGA and a passive crystal oscillator Y1, wherein the passive crystal oscillator Y1 is connected with the chip PHYA, the chip PHYA is connected with the chip PHYB, and the chip PHYB is connected with the chip FPGA;

one end of the passive crystal oscillator Y1 is connected with a pin 5 of the chip PHYA, and the other end of the passive crystal oscillator Y1 is connected with a pin 4 of the chip PHYA.

Further, a pin 5 of the chip PHYA is connected to one end of a capacitor C40, the other end of the capacitor C40 is grounded, a pin 4 of the chip PHYA is connected to one end of a capacitor C41, and the other end of the capacitor C41 is grounded.

Further, a resistor R284 is arranged between the pin 4 and the pin 5 of the chip PHYA, one end of the resistor R284 is connected with the pin 4 of the chip PHYA, and the other end of the resistor R284 is connected with the pin 5 of the chip PHYA.

Further, a resistor R251 and a resistor R290 are arranged between the chip PHYA and the chip PHYB, one end of the resistor R251 is connected with the pin 23 of the chip PHYA, the other end of the resistor R251 is respectively connected with the pin 5 of the chip PHYB and one end of the resistor R290, and the other end of the resistor R290 is grounded.

Further, a pin 23 of the chip PHYB is directly connected with a pin 61 of the chip FPGA;

or the like, or, alternatively,

a resistor R67 is arranged between the pin 23 of the chip PHYB and the pin 61 of the chip FPGA, one end of the resistor R67 is connected with the pin 23 of the chip PHYB, and the other end of the resistor R67 is connected with the pin 61 of the chip FPGA.

Further, the pin 4 of the chip PHYB is arranged in a floating manner.

An LED receiving card crystal oscillator application device comprises the LED receiving card crystal oscillator application circuit.

The utility model discloses a technological effect and advantage:

through an external 25M passive crystal oscillator Y1 at chip PHYA, chip PHYA can normally work, and chip PHYA's pin 23 outputs a 25M clock and provides chip PHYB for the level problem, reduces the level of output through resistance partial pressure, and chip PHYB can normally work this moment, and chip PHYB outputs 25M clock for chip FPGA like this, and chip FPGA can normally work to realize reducing crystal oscillator quantity, reach reduce cost's effect.

Additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by the practice of the invention. The objectives and other advantages of the invention will be realized and attained by the structure particularly pointed out in the written description and claims hereof as well as the appended drawings.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.

Fig. 1 shows a schematic diagram of the overall circuit structure of an embodiment of the present invention;

fig. 2 shows a schematic diagram of a connection circuit between the passive crystal oscillator Y1 and the chip PHYA according to an embodiment of the present invention;

fig. 3 shows a schematic diagram of a connection circuit between the chip PHYA and the chip PHYB according to an embodiment of the present invention.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the embodiments of the present invention are clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

The conventional LED receiving card needs to use three crystal oscillators, namely a PHYA part, a PHYB part and an FPGA part, so that a large amount of PCB space is occupied, and the cost is high. Therefore, the utility model provides a LED receives card crystal oscillator application circuit does not adopt three crystal oscillators on the basis of current circuit, and only adopts a passive crystal oscillator, and is exemplary, as shown in fig. 1-3, the circuit includes chip PHYA, chip PHYB, chip FPGA and passive crystal oscillator Y1, passive crystal oscillator Y1 is connected with chip PHYA, chip PHYA is connected with chip PHYB, chip PHYB is connected with chip FPGA. For example, the models of the chip PHYA and the chip PHYB in the embodiment are YT 8511.

Pin 5 of the chip PHYA is connected with one end of a capacitor C40, the other end of the capacitor C40 is grounded, pin 4 of the chip PHYA is connected with one end of a capacitor C41, and the other end of the capacitor C41 is grounded.

A resistor R284 is further arranged between the pin 4 and the pin 5 of the chip PHYA, one end of the resistor R284 is connected with the pin 4 of the chip PHYA, and the other end of the resistor R284 is connected with the pin 5 of the chip PHYA.

A resistor R251 and a resistor R290 are arranged between the chip PHYA and the chip PHYB, one end of the resistor R251 is connected with a pin 23 of the chip PHYA, the other end of the resistor R251 is respectively connected with a pin 5 of the chip PHYB and one end of the resistor R290, and the other end of the resistor R290 is grounded.

The pin 23 of the chip PHYB is directly connected with the pin 61 of the chip FPGA;

or the like, or, alternatively,

And a pin 4 of the chip PHYB is arranged in a floating mode.

The utility model also provides a LED receives card crystal oscillator application apparatus, the device includes foretell LED and receives card crystal oscillator application circuit.

The embodiment of the utility model provides an in, at external 25M passive crystal oscillator Y1 of XTAL _ in/XTAL _ out part of chip PHYA, chip PHYA can normally work, and the CLK level of CLK _25M output is reduced through resistance R251 partial pressure to 25M clock through chip PHYA provides chip PHYB, because the level problem, chip PHYB can normally work this moment, chip FPGA can normally work for chip PHYB exports 25M clock in the same reason, chip FPGA can normally work. Therefore, the number of crystal oscillators is reduced, and the effect of reducing the cost is achieved.

Although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the present invention in its corresponding aspects.

Claims

1. The crystal oscillator application circuit of the LED receiving card is characterized by comprising a chip PHYA, a chip PHYB, a chip FPGA and a passive crystal oscillator Y1, wherein the passive crystal oscillator Y1 is connected with the chip PHYA, the chip PHYA is connected with the chip PHYB, and the chip PHYB is connected with the chip FPGA;

2. The LED receiving card crystal oscillator application circuit as claimed in claim 1, wherein a pin 5 of the chip PHYA is connected to one end of a capacitor C40, the other end of the capacitor C40 is grounded, a pin 4 of the chip PHYA is connected to one end of a capacitor C41, and the other end of the capacitor C41 is grounded.

3. The LED receiving card crystal oscillator application circuit as claimed in claim 2, wherein a resistor R284 is further arranged between the pin 4 and the pin 5 of the chip PHYA, one end of the resistor R284 is connected with the pin 4 of the chip PHYA, and the other end of the resistor R284 is connected with the pin 5 of the chip PHYA.

4. The LED receiving card crystal oscillator application circuit according to claim 2 or 3, wherein a resistor R251 and a resistor R290 are disposed between the chip PHYA and the chip PHYB, one end of the resistor R251 is connected to the pin 23 of the chip PHYA, the other end of the resistor R251 is respectively connected to the pin 5 of the chip PHYB and one end of the resistor R290, and the other end of the resistor R290 is grounded.

5. The LED receiving card crystal oscillator application circuit according to claim 4,

or the like, or, alternatively,

6. The LED receiving card crystal oscillator application circuit as claimed in claim 5, wherein pin 4 of the chip PHYB is in a floating configuration.

7. An LED receiving card crystal oscillator application device, which is characterized by comprising the LED receiving card crystal oscillator application circuit as claimed in any one of claims 1 to 6.