Bluetooth wireless communication circuit of PCR instrument

Abstract

The utility model discloses a Bluetooth wireless communication circuit of a PCR instrument, which comprises a first chip U1 and a second chip U2, the first chip U1 is an MCU chip, a 29th pin of the first chip U1 is connected with one end of a first resistor R1, the other end of the first resistor R1 is connected with a second pin of the second chip U2, a 32th pin of the first chip U1 is connected with one end of a second resistor R2, the other end of the second resistor R2 is connected with the other end of the first resistor R1, and the other end of the second resistor R2 is connected with the other end of the second resistor U2. The other end of the second resistor R2 is connected with a third pin of the second chip U2; the sixth pin of the first chip U1 is a power supply positive electrode input pin, the typical input voltage is 3.3 V, the first chip U1 is connected with a VDD, and the VDD power supply voltage is 3.3 V; a seventh pin of the first chip U1 is a power supply negative electrode input pin and is connected with a power supply reference point GND; according to the scheme, the Bluetooth communication circuit for the PCR instrument is simple in circuit and occupies less hardware resources; the communication mode of an existing instrument is simplified, and the PCR instrument can conduct wireless information exchange with related external equipment such as a mobile phone, a PAD and a notebook computer.

Description

Technical Field

[0001] The utility model relates to the technical field of wireless communication, in particular to a Bluetooth wireless communication circuit of a PCR instrument. Background Art

[0002] Most of the PCR instruments currently in use use USB or serial communication, and the communication project requires the connection of USB cables or serial cables. With the development of wireless Bluetooth technology and the popularity of smart phones, a small number of instruments in the field of PCR instruments have gradually begun to use wireless Bluetooth technology, but the existing Bluetooth communication circuits are often complex and costly, and Bluetooth communication often requires a large amount of hardware resources of the controller.

[0003] Most of the existing technologies are based on the design goal of Bluetooth to form a base station-free local area network (similar to the AdHoc mode of WLAN) between devices, and use encryption algorithms for short-range communication between multiple devices to ensure privacy and security. However, the investment cost is high and the equipment power consumption is large. Therefore, it is very necessary to develop a Bluetooth communication module with low cost, low power consumption and suitable for PCR instruments.

[0004] Therefore, it is necessary to design a Bluetooth wireless communication circuit for a PCR instrument. Utility Model Content

[0005] The purpose of the utility model is to provide a Bluetooth wireless communication circuit for a PCR instrument to solve the problems raised in the above background technology.

[0006] To achieve the above object, the utility model provides the following technical solution: a Bluetooth wireless communication circuit of a PCR instrument, comprising: a first chip U1 and a second chip U2, wherein the first chip U1 is an MCU chip, and the second chip U2 is a Bluetooth chip;

[0007] The 29th pin of the first chip U1 is connected to one end of the first resistor R1, the other end of the first resistor R1 is connected to the second pin of the second chip U2, the 32nd pin of the first chip U1 is connected to one end of the second resistor R2, the other end of the second resistor R2 is connected to the 3rd pin of the second chip U2;

[0008] The 6th pin of the first chip U1 is the positive power input pin, with a typical input voltage of 3.3V, connected to VDD, and the VDD power supply voltage is 3.3V; the 7th pin of the first chip U1 is the negative power input pin, connected to the power reference point GND.

[0009] Preferably, it further includes a first capacitor C1, wherein the first capacitor C1 is a filter capacitor of the first chip U1, and one end of the first capacitor C1 is connected to VDD, and the other end is connected to GND.

[0010] Preferably, it further comprises a first crystal oscillator Y1, wherein the first pin of the first crystal oscillator Y1 is connected to the 12th pin of the second chip, the third pin is connected to the 13th pin of the second chip, and the second pin and the fourth pin are connected to GND.

[0011] Preferably, the 4th pin of the second chip U2 is connected to GND; the 7th pin of the second chip U2 is connected to GND, the 14th pin of the second chip U2 is the positive power input pin, the typical input voltage is 3.3V, connected to VDD; the 15th pin of the second chip U2 is the negative power input pin, connected to the power reference point GND; the 16th pin of the second chip U2 is connected to the antenna.

[0012] Preferably, it further includes a second capacitor C2, which is a filter capacitor of the second chip U2, and one end of the second capacitor C2 is connected to VDD, and the other end is connected to GND.

[0013] Preferably, the first chip U1 has a model number of STM32G030C8T6; the second chip U2 has a model number of ECB02C; the first resistor R1 and the second resistor R2 are both thick film resistors with the same resistance value, both of which are 330Ω; the first capacitor C1 and the second capacitor C2 are both ceramic capacitors with the same capacitance value, which is 0.1uF; the first crystal oscillator Y1 is a passive crystal oscillator, and the crystal oscillator frequency is 10MHz±10ppm 9pF.

[0014] Compared with the prior art, the beneficial effects of the utility model are:

[0015] The other end of the first resistor R1 is connected to the second pin of the second chip U2, and the connection function is to send the MCU data of the first chip to the Bluetooth end of the second chip. The other end of the second resistor R2 is connected to the third pin of the second chip U2, and the connection function is to send the Bluetooth data of the second chip to the MCU end of the first chip. The seventh pin of the second chip U2 is connected to GND, and the function is that this pin is a sleep pin. In sleep mode, data can only be sent but not received. The function of connecting to GND is to not start the sleep mode. The Bluetooth communication circuit for PCR instruments has a simple circuit, low cost, and occupies less hardware resources. The communication method of existing instruments is simplified, and the PCR instrument can exchange wireless information with relevant external devices including mobile phones, PADs, and laptops.

[0016] The first pin of the first crystal oscillator Y1 is connected to the 12th pin of the second chip, the 3rd pin is connected to the 13th pin of the second chip, and the 2nd and 4th pins are connected to GND. The crystal oscillator provides a stable and accurate single-frequency oscillation for the second chip U2.

[0017] The first capacitor C1 and the second capacitor C2 have a good filtering effect and can effectively filter out clutter. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is the Bluetooth wireless communication circuit diagram of the PCR instrument of the present utility model. DETAILED DESCRIPTION

[0019] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0020] See also Figure 1 , a Bluetooth wireless communication circuit of a PCR instrument, comprising: a first chip U1 and a second chip U2;

[0021] The 29th pin (transmitting pin / TX pin) of the first chip U1 is connected to one end of the first resistor R1, and the other end of the first resistor R1 is connected to the second pin of the second chip U2, and the connection function is to send the MCU data of the first chip to the Bluetooth end of the second chip; the 32nd pin (receiving pin / RX pin) of the first chip U1 is connected to one end of the second resistor R2, and the other end of the second resistor R2 is connected to the 3rd pin of the second chip U2, and the connection function is to send the Bluetooth data of the second chip to the MCU end of the first chip;

[0022] The 6th pin of the first chip U1 is the positive input pin of the power supply, with a typical input voltage of 3.3 V, connected to VDD, and the VDD power supply voltage is 3.3 V. The 7th pin of the first chip U1 is the negative input pin of the power supply, connected to the power supply reference point GND.

[0023] The first capacitor C1 is the filter capacitor of the first chip U1. One end of the first capacitor C1 is connected to VDD, and the other end is connected to GND. It is located close to the 6th and 7th pins of the first chip U1 in the PCB layout, and has a good filtering effect.

[0024] The first pin of the first crystal oscillator Y1 is connected to the 12th pin of the second chip, the 3rd pin is connected to the 13th pin of the second chip, the 2nd pin and the 4th pin are connected to GND. The crystal oscillator provides stable and accurate single-frequency oscillation for the second chip U2.

[0025] The 4th pin of the second chip U2 is connected to GND. This pin is the AT command enable pin. The function of connecting to GND is that the AT command is valid when the Bluetooth is connected, and non-AT commands are transparently transmitted; the 7th pin of the second chip U2 is connected to GND. The function of this pin is the sleep pin. In sleep mode, data can only be sent but not received. The function of connecting to GND is not to start the sleep mode; the 14th pin of the second chip U2 is the positive input pin of the power supply, the typical input voltage is 3.3V, connected to VDD; the 15th pin of the second chip U2 is the negative input pin of the power supply, connected to the power reference point GND. The 16th pin of the second chip U2 is connected to the antenna, which can be compatible with antennas of various specifications, such as PCB antennas, ceramic antennas, etc.

[0026] The second capacitor C2 is the filter capacitor of the second chip U2. One end of the second capacitor C2 is connected to VDD, and the other end is connected to GND. It is located close to the 14th and 15th pins of the second chip U2 in the PCB layout, and has a good filtering effect.

[0027] The first chip U1, its model is STM32G030C8T6, using LQFP-48 package, it is a 32-bit MCU of ARMCortexM0 architecture, 64KB Flash memory, 8KB SRAM, with internal hardware watchdog, support for custom development of application interface, support for packet processing, data buffering and burst transmission, etc. This Bluetooth module is compatible with most MCUs on the market.

[0028] The second chip U2, whose model is ECB02C, is a serial port transparent chip that supports the low-power Bluetooth protocol. The chip has the advantages of small size, high performance, high cost performance, low power consumption, and strong platform compatibility.

[0029] The first resistor R1 and the second resistor R2 are both thick film resistors with the same resistance value, both 330Ω. The first capacitor C1 and the second capacitor C2 are both ceramic capacitors with the same capacitance value, 0.1uF. The first crystal oscillator Y1 is a passive crystal oscillator with a crystal frequency of 10MHz±10ppm 9pF.

[0030] Overall structural principle: the other end of the first resistor R1 is connected to the second pin of the second chip U2, and the connection function is to send the MCU data of the first chip to the Bluetooth end of the second chip. The other end of the second resistor R2 is connected to the third pin of the second chip U2, and the connection function is to send the Bluetooth data of the second chip to the MCU end of the first chip. The seventh pin of the second chip U2 is connected to GND, and the function is that this pin is a sleep pin. In sleep mode, data can only be sent but not received. The function of connecting to GND is to not start the sleep mode. The Bluetooth communication circuit for PCR instruments has a simple circuit, low cost, and occupies less hardware resources. The communication method of existing instruments is simplified, and the PCR instrument can exchange wireless information with relevant external devices including mobile phones, PADs, and laptops.

[0031] The first pin of the first crystal oscillator Y1 is connected to the 12th pin of the second chip, the 3rd pin is connected to the 13th pin of the second chip, and the 2nd and 4th pins are connected to GND. The crystal oscillator provides a stable and accurate single-frequency oscillation for the second chip U2.

[0032] The first capacitor C1 and the second capacitor C2 have a good filtering effect and can effectively filter out clutter.

[0033] Parts not involved in the present invention are the same as the prior art or can be implemented by the prior art. Although the embodiments of the present invention have been shown and described, it is understood by those skilled in the art that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the present invention, and the scope of the present invention is defined by the attached claims and their equivalents.

Claims

1. A Bluetooth wireless communication circuit for a PCR instrument, characterized in that: include: A first chip U1 and a second chip U2, wherein the first chip U1 is an MCU chip, and the second chip U2 is a Bluetooth chip; The 29th pin of the first chip U1 is connected to one end of the first resistor R1, the other end of the first resistor R1 is connected to the second pin of the second chip U2, the 32nd pin of the first chip U1 is connected to one end of the second resistor R2, the other end of the second resistor R2 is connected to the 3rd pin of the second chip U2; The 6th pin of the first chip U1 is the positive power input pin, with a typical input voltage of 3.3V, connected to VDD, and the VDD power supply voltage is 3.3V; the 7th pin of the first chip U1 is the negative power input pin, connected to the power reference point GND.

2. The Bluetooth wireless communication circuit of a PCR instrument according to claim 1, characterized in that: The first capacitor C1 is also included. The first capacitor C1 is a filter capacitor of the first chip U1. One end of the first capacitor C1 is connected to VDD, and the other end is connected to GND.

3. The Bluetooth wireless communication circuit of a PCR instrument according to claim 1, characterized in that: It also includes a first crystal oscillator Y1, wherein the first pin of the first crystal oscillator Y1 is connected to the 12th pin of the second chip, the third pin is connected to the 13th pin of the second chip, and the second pin and the fourth pin are connected to GND.

4. The Bluetooth wireless communication circuit of a PCR instrument according to claim 1, characterized in that: The 4th pin of the second chip U2 is connected to GND; the 7th pin of the second chip U2 is connected to GND, the 14th pin of the second chip U2 is the positive power input pin, the typical input voltage is 3.3V, connected to VDD; the 15th pin of the second chip U2 is the negative power input pin, connected to the power reference point GND; the 16th pin of the second chip U2 is connected to the antenna.

5. The Bluetooth wireless communication circuit of a PCR instrument according to claim 1, characterized in that: It also includes a second capacitor C2, which is a filter capacitor of the second chip U2. One end of the second capacitor C2 is connected to VDD, and the other end is connected to GND.

6. The Bluetooth wireless communication circuit of a PCR instrument according to claim 2, characterized in that: The first chip U1 has a model of STM32G030C8T6; the second chip U2 has a model of ECB02C; the first resistor R1 and the second resistor R2 are both thick film resistors with the same resistance value, both of which are 330Ω; the first capacitor C1 and the second capacitor C2 are both ceramic capacitors with the same capacitance value, which is 0.1uF; the first crystal oscillator Y1 is a passive crystal oscillator, and the crystal oscillator frequency is 10MHz±10ppm 9pF.

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