CN108632792B - Novel bluetooth circuit and POS machine - Google Patents
Novel bluetooth circuit and POS machine Download PDFInfo
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- CN108632792B CN108632792B CN201711295154.8A CN201711295154A CN108632792B CN 108632792 B CN108632792 B CN 108632792B CN 201711295154 A CN201711295154 A CN 201711295154A CN 108632792 B CN108632792 B CN 108632792B
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- 239000003990 capacitor Substances 0.000 claims abstract description 146
- 230000002093 peripheral effect Effects 0.000 claims abstract description 15
- 239000013078 crystal Substances 0.000 claims abstract description 13
- 230000005540 biological transmission Effects 0.000 description 7
- 238000010586 diagram Methods 0.000 description 4
- 230000006870 function Effects 0.000 description 4
- 238000000034 method Methods 0.000 description 3
- 239000000243 solution Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000002457 bidirectional effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B5/00—Near-field transmission systems, e.g. inductive or capacitive transmission systems
- H04B5/40—Near-field transmission systems, e.g. inductive or capacitive transmission systems characterised by components specially adapted for near-field transmission
- H04B5/48—Transceivers
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- G—PHYSICS
- G07—CHECKING-DEVICES
- G07G—REGISTERING THE RECEIPT OF CASH, VALUABLES, OR TOKENS
- G07G1/00—Cash registers
- G07G1/12—Cash registers electronically operated
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Abstract
The invention belongs to the technical field of Bluetooth communication, and provides a novel Bluetooth circuit and a POS machine. The circuit comprises a TC35661 master control chip, a band-pass filter, a peripheral crystal oscillator module, a first capacitor, a second capacitor, a third capacitor, a fourth capacitor, a fifth capacitor, a sixth capacitor, a first resistor, a second resistor, a third resistor, a seventh capacitor, an eighth capacitor, a ninth capacitor, a tenth capacitor, an eleventh capacitor and a twelfth capacitor; the H2 pin of the TC35661 master control chip is connected with the band-pass filter; the D1 pin and the D2 pin of the TC35661 master control chip are connected with the peripheral crystal oscillator module; the communication connection of the novel Bluetooth circuit accords with PCI safety standard; therefore, the problems that the Bluetooth connection is low in safety level, the BT4.2 standard cannot be supported and the practicability is low in the prior art are effectively solved.
Description
Technical Field
The invention belongs to the technical field of Bluetooth communication, and particularly relates to a novel Bluetooth module and a POS machine.
Background
Bluetooth is a wireless technical standard, and compared with a traditional wired physical communication transmission mode, bluetooth adopts a wireless communication protocol, so that short-distance data exchange among fixed equipment, mobile equipment and building personal area networks is realized, and the data transmission efficiency among users is greatly improved. In the prior art, serial communication between the Bluetooth module and the host adopts BLE connection, namely Bluetooth low-power connection, the Bluetooth module and the host adopt variable connection time intervals, data transmission is carried out in the variable time intervals, and a data transmission link is closed in a non-connection state, so that low-power consumption and short-distance connection between the Bluetooth module and the host are realized.
Thus, the prior art has at least the following problems: the existing Bluetooth module has lower security LEVEL in BLE MODE, can only reach the security LEVEL of MODE1LEVEL2, can not support BT4.2 standard, does not accord with PCI security standard of bank card payment, and has low practicality.
Disclosure of Invention
The invention provides a novel Bluetooth circuit and a POS machine, and aims to solve the problem that Bluetooth connection safety level is low and PCI safety connection standard paid by a bank card cannot be met in the prior art.
The first aspect of the invention provides a novel Bluetooth circuit, which comprises a TC35661 master control chip, a band-pass filter, a peripheral crystal oscillator module, a first capacitor, a second capacitor, a third capacitor, a fourth capacitor, a fifth capacitor, a sixth capacitor, a first resistor, a second resistor, a third resistor, a seventh capacitor, an eighth capacitor, a ninth capacitor, a tenth capacitor, an eleventh capacitor and a twelfth capacitor;
the H2 pin of the TC35661 main control chip is connected with the band-pass filter;
the D1 pin and the D2 pin of the TC35661 master control chip are connected with the peripheral crystal oscillator module;
the C2 pin of the TC35661 main control chip is grounded in digital, the first end of the first capacitor and the first end of the second capacitor are connected with the A7 pin and the H6 pin of the TC35661 main control chip, the second end of the first capacitor and the second end of the second capacitor are grounded in digital, the F3 pin, the F2 pin, the H1 pin, the H3 pin and the E2 pin of the TC35661 main control chip are grounded in analog, the third capacitor and the fourth capacitor are connected between the E1 pin and the analog ground of the TC35661 main control chip, the fifth capacitor and the sixth capacitor are connected between the H4 pin, the F1 pin and the G1 pin and the analog ground of the TC35661 main control chip, the first resistor is connected between the A8 pin and the digital ground of the TC35661 main control chip, the E5 pin, the E6 pin, the F5 pin and the F6 pin of the TC35661 main control chip are grounded in digital, the D4 pin and the G4 pin of the TC35661 main control chip are connected with analog ground, the H5 pin, the G5 pin and the G2 pin of the TC35661 main control chip are connected between the first driving signal input end of the Bluetooth circuit and the first end of the second resistor, the first end of the seventh capacitor, the first end of the eighth capacitor, the first end of the ninth capacitor and the first end of the tenth capacitor, the second end of the seventh capacitor, the second end of the eighth capacitor and the second end of the tenth capacitor are connected with analog ground, the A1 pin, the A6 pin and the H7 pin of the TC35661 main control chip are connected between the second driving signal input end of the Bluetooth circuit and the second end of the second resistor, the first end of the eleventh capacitor and the first end of the twelfth capacitor, a second terminal of the eleventh capacitor is connected with a second terminal of the twelfth capacitor to be digitally grounded;
the E7 pin of the TC35661 master control chip is the data transmitting end of the Bluetooth circuit, the F8 pin of the TC35661 master control chip is the data receiving end of the Bluetooth circuit, the third resistor is connected between the E8 pin of the TC35661 master control chip and digital ground, the D5 pin of the TC35661 master control chip is the reset signal input end of the Bluetooth circuit, the C7 pin of the TC35661 master control chip is the first interrupt signal input end of the Bluetooth circuit, the A4 pin of the TC35661 master control chip is the first state signal display end of the Bluetooth circuit, the G7 pin of the TC35661 master control chip is the enabling end of the Bluetooth circuit, the B5 pin of the TC35661 master control chip is connected with the data line of the Bluetooth circuit, the B6 pin of the TC35661 master control chip is connected with the clock signal line of the Bluetooth circuit, the B7 pin, the B8 pin, the C1 pin and the D3 pin of the TC35661 master control chip are grounded, and the E3 pin 35661, the E4 pin and the F4 pin are grounded.
Further, the band-pass filter comprises a DEA202450BT control chip, a high-frequency inductor, a thirteenth capacitor, a fourteenth capacitor and a fifteenth capacitor;
the first pin of the DEA202450BT control chip is a signal input end of the band-pass filter;
the second pin of the DEA202450BT control chip is grounded in an analog mode;
the fourth pin of the DEA202450BT control chip is grounded in an analog manner;
the third pin of the DEA202450BT control chip is connected with the first end of the high-frequency inductor and the first end of the thirteenth capacitor, the second end of the thirteenth capacitor is connected with the analog ground, the first end of the fourteenth capacitor and the first end of the fifteenth capacitor are connected with the second end of the high-frequency inductor, the second end of the fourteenth capacitor is connected with the analog ground, and the second end of the fifteenth capacitor is connected with the H2 pin of the TC35661 main control chip.
Further, the peripheral crystal oscillator module comprises an SMD3225 control chip, a fourth resistor, a sixteenth capacitor and a seventeenth capacitor;
the second pin and the fourth pin of the SMD3225 control chip are grounded in an analog mode;
the fourth resistor is connected between the first pin and the third pin of the SMD3225 control chip, the sixteenth capacitor is connected between the first pin and the analog ground of the SMD3225 control chip, the seventeenth capacitor is connected between the third pin and the analog ground of the SMD3225 control chip, the first pin of the SMD3225 control chip is connected with the D1 pin of the TC35661 main control chip, and the third pin of the SMD3225 control chip is connected with the D2 pin of the TC35661 main control chip.
The second aspect of the invention provides a POS machine comprising a Bluetooth circuit as described above.
Compared with the prior art, the invention has the following beneficial technical effects: in the Bluetooth circuit, a TC35661 main control chip is adopted as a core control chip, and pins of the TC35661 main control chip are connected with corresponding matching devices such as a band-pass filter, a peripheral crystal oscillator module and a capacitor, and as the TC35661 main control chip has the functions of low power consumption and secret communication, when the Bluetooth circuit is communicated with a host, the Bluetooth circuit can be controlled in real time through external instructions, so that the safety level of Bluetooth connection is improved, and the PCI safety connection standard is met; therefore, the problem that in the prior art, bluetooth connection is low in safety level and weak in practicability is effectively solved.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are needed in the description of the embodiments will be briefly described below, it being obvious that the drawings in the following description are only some embodiments of the present invention, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a circuit configuration diagram of a novel bluetooth circuit according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of a POS machine according to an embodiment of the invention.
Detailed Description
The present invention will be described in further detail with reference to the drawings and examples, in order to make the objects, technical solutions and advantages of the present invention more apparent. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention.
Firstly, it should be noted that the existing bluetooth module can only reach a MODE1LEVEL2 security LEVEL in a BLE MODE, wherein the MODE1LEVEL2 belongs to a type of security LEVEL in communication connection, and compared with the MODE1LEVEL4, the MODE1LEVEL2 security LEVEL has a lower security coefficient, and according to internationally recognized PCI (Payment Card Industry ) authentication, the PCI security standard performs strict and careful detection from six aspects of physical security, logic security, online security, offline security, equipment security management during production, equipment security management before initial key injection, and ensures the equipment security of a payment card, which is the most strict and highest-LEVEL security authentication standard of the financial equipment at present; the MODE1LEVEL2 security LEVEL achieved by the existing bluetooth communication connection cannot meet the PCI security standard, thereby limiting the practicality of the bluetooth circuit and related products thereof; meanwhile, according to the latest Bluetooth communication standard, namely the BT4.2 Bluetooth standard, compared with the traditional Bluetooth 4.0 standard, the Bluetooth 3.0 standard and the like, the BT4.2 Bluetooth standard improves the data transmission speed and the privacy protection degree, and Bluetooth equipment can be directly connected to the Internet through wireless access, and a Bluetooth module in the prior art cannot support the latest BT4.2 standard, so that the comprehensive performance of the traditional Bluetooth equipment is reduced; in order to solve the technical problems, the implementation of the invention provides a novel Bluetooth circuit which can support the latest BT4.2 standard, and the communication connection between the Bluetooth circuit and external equipment can reach the MODE1LEVEL4 security LEVEL, so that the practicability of the Bluetooth module is improved.
Fig. 1 shows a structure diagram of a novel bluetooth circuit according to an embodiment of the present invention, and for convenience of explanation, only the portions related to the embodiment of the present invention are shown in detail as follows:
as shown in FIG. 1, the novel Bluetooth circuit comprises a TC35661 master control chip, a band-pass filter 101, a peripheral crystal oscillator module 102, a first capacitor C1, a second capacitor C2, a third capacitor C3, a fourth capacitor C4, a fifth capacitor C5, a sixth capacitor C6, a first resistor R1, a second resistor R2, a third resistor R3, a seventh capacitor C7, an eighth capacitor C8, a ninth capacitor C9, a tenth capacitor C10, an eleventh capacitor C11 and a twelfth capacitor C12.
The H2 pin of the TC35661 master control chip is connected with the band-pass filter 101.
The D1 pin and the D2 pin of the TC35661 master control chip are connected with the peripheral crystal oscillator module 102.
The C2 pin of the TC35661 main control chip is connected with the digital ground GND, the first end of the first capacitor C1 and the first end of the second capacitor C2 are connected with the A7 pin and the H6 pin of the TC35661 main control chip, the second end of the first capacitor C1 and the second end of the second capacitor C2 are connected with the digital ground GND, the F3 pin, the F2 pin, the H1 pin, the H3 pin and the E2 pin of the TC35661 main control chip are connected with the analog ground AGND, the third capacitor C3 and the fourth capacitor C4 are connected between the E1 pin and the analog ground AGND of the TC35661 main control chip, the fifth capacitor C5 and the sixth capacitor C6 are connected between the H4 pin, the F1 pin and the G1 pin of the TC35661 main control chip and the analog ground AGND, the first resistor R1 is connected between the A8 pin and the digital ground GND of the TC35661 main control chip, the E5 pin, the E6 pin, the F5 pin and the F6 pin are connected with the digital ground GND, the D4 pin and the G4 pin of the TC35661 main control chip are connected with the analog ground GND, the H5 pin, the G5 pin and the G2 pin of the TC35661 main control chip are connected between the first driving signal input end of the bluetooth circuit and the first end of the second resistor R2, the first end of the seventh capacitor C7, the first end of the eighth capacitor C8, the first end of the ninth capacitor C9 and the first end of the tenth capacitor C10, the second end of the seventh capacitor C7, the second end of the eighth capacitor C8, the second end of the ninth capacitor C9 and the second end of the tenth capacitor C10 are connected to the analog ground AGND, and the A1 pin, the A6 pin and the H7 pin of the TC35661 main control chip are connected between the second driving signal input end of the bluetooth circuit and the second end of the second resistor R2, the first end of the eleventh capacitor C11 and the first end of the twelfth capacitor C12, and the second end of the eleventh capacitor C11 are connected to the digital ground GND.
The E7 pin of the TC35661 main control chip is the data transmitting end of the Bluetooth circuit, the F8 pin of the TC35661 main control chip is the data receiving end of the Bluetooth circuit, the third resistor R3 is connected between the E8 pin of the TC35661 main control chip and the digital ground GND, the D5 pin of the TC35661 main control chip is the reset signal input end of the Bluetooth circuit, the C7 pin of the TC35661 main control chip is the first interrupt signal input end of the Bluetooth circuit, the A4 pin of the TC35661 main control chip is the first state signal display end of the Bluetooth circuit, the G7 pin of the TC35661 main control chip is the enabling end of the Bluetooth circuit, the B5 pin of the TC35661 main control chip is connected with the data line of the Bluetooth circuit, the B6 pin of the TC35661 main control chip is connected with the clock signal line of the Bluetooth circuit, the B7 pin, the B8 pin, the C1 pin and the D3 pin of the TC35661 main control chip are connected with the digital ground GND, and the E3 pin, the E4 pin, the G3 pin and the F3 pin of the TC35661 main control chip are connected with the analog ground ND.
Preferably, the TC35661 master control chip adopts a TC35661-551 Bluetooth chip.
Specifically, the first driving signal input end of the bluetooth circuit and the second driving signal input end of the bluetooth circuit are used for inputting driving signals to the bluetooth circuit, so as to drive the bluetooth circuit to realize corresponding functions; optionally, the drive signal originates from a peripheral circuit.
Specifically, the E7 pin and the F8 pin of the TC35661 master control chip establish a data transmission path with an external memory, and data exchange between the Bluetooth circuit and the memory can be realized through the data transmission path.
Specifically, the D5 pin of the TC35661 main control chip is used for receiving a reset signal, so that the TC35661 main control chip can stably operate; the C7 pin of the TC35661 main control chip is used for receiving a first interrupt signal; the A4 pin of the TC35661 master control chip is used for transmitting a first state signal of the TC35661 master control chip; and the G7 pin of the TC35661 main control chip is an enabling end of the Bluetooth circuit, and optionally, when the G7 pin is activated by a control signal, the TC35661 main control chip is in a working state.
Specifically, the band-pass filter 101 includes a DEA202450BT control chip, a high-frequency inductor L1, a thirteenth capacitor C13, a fourteenth capacitor C14, and a fifteenth capacitor C15.
The first pin of the DEA202450BT control chip is a signal input terminal of the band-pass filter 101 for inputting a first digital signal.
The second pin of the DEA202450BT control chip is connected to analog ground AGND.
The fourth pin of the DEA202450BT control chip is connected to analog ground AGND.
The third pin of the DEA202450BT control chip is connected with the first end of the high-frequency inductor L1 and the first end of the thirteenth capacitor C13, the second end of the thirteenth capacitor C13 is connected with the analog ground AGND, the first end of the fourteenth capacitor C14 and the first end of the fifteenth capacitor C15 are connected with the second end of the high-frequency inductor L1, the second end of the fourteenth capacitor C14 is connected with the analog ground AGND, and the second end of the fifteenth capacitor C15 is connected with the pin of the TC35661 main control chip H2.
Specifically, the peripheral crystal oscillator module 102 includes an SMD3225 control chip, a fourth resistor R4, a sixteenth capacitor C16, and a seventeenth capacitor C17.
The SMD3225 controls the second and fourth pins of the chip to ground analog AGND.
The fourth resistor R4 is connected between the first pin and the third pin of the SMD3225 control chip, the sixteenth capacitor C16 is connected between the first pin and the analog ground AGND of the SMD3225 control chip, the seventeenth capacitor C17 is connected between the third pin and the analog ground AGND of the SMD3225 control chip, the first pin of the SMD3225 control chip is connected with the D1 pin of the TC35661 main control chip, and the third pin of the SMD3225 control chip is connected with the D2 pin of the TC35661 main control chip.
Specifically, as shown in fig. 1, the pins of the TC35661 master control chip: b3 pin, D6 pin, B1 pin, C5 pin, C4 pin, C3 pin, C8 pin, F7 pin, D7 pin, H8 pin, G6 pin, B2 pin, A2 pin, C6 pin, D8 pin, A5 pin, A3 pin and B4 pin which are all universal I/O ports of the TC35661 master control chip for communication connection with peripheral devices; in a specific application process, the general I/O ports can be used as function expansion ports to receive or transmit communication signals, so that the novel Bluetooth circuit can have more complex functions.
Fig. 2 shows a schematic structural diagram of a POS machine according to an embodiment of the invention, and as shown in fig. 2, the POS machine 20 includes a bluetooth circuit 201 as described above.
According to the embodiment of the invention, the Bluetooth circuit takes TC35661 as a main control chip, each pin of the TC35661 main control chip is externally connected with a band-pass filter, a peripheral crystal oscillator module, a capacitor and other power devices, and the Bluetooth circuit can realize bidirectional serial port communication with a host due to good compatibility of the TC35661 chip, so that the BT4.2 standard is supported, the PCI safety connection standard is met, and the safety level of the Bluetooth circuit is improved; therefore, the defect that the Bluetooth connection in the prior art is low in security level and cannot support the BT4.2 standard is effectively overcome.
It should be noted that in this document relational terms such as first and second are used solely to distinguish one entity from another entity without necessarily requiring or implying any actual such relationship or order between such entities. And the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a product or structure that comprises a list of elements is inherent to the element. Without further limitation, an element defined by the statement "comprising … …" or "comprising … …" does not exclude the presence of additional elements in a process, method, article or terminal device comprising the element. Further, herein, "greater than," "less than," "exceeding," and the like are understood to not include the present number; "above", "below", "within" and the like are understood to include this number.
The foregoing description of the preferred embodiments of the invention is not intended to be limiting, but rather is intended to cover all modifications, equivalents, and alternatives falling within the spirit and principles of the invention.
Claims (4)
1. The novel Bluetooth circuit is characterized by comprising a TC35661 master control chip, a band-pass filter, a peripheral crystal oscillator module, a first capacitor, a second capacitor, a third capacitor, a fourth capacitor, a fifth capacitor, a sixth capacitor, a first resistor, a second resistor, a third resistor, a seventh capacitor, an eighth capacitor, a ninth capacitor, a tenth capacitor, an eleventh capacitor and a twelfth capacitor;
the H2 pin of the TC35661 main control chip is connected with the band-pass filter;
the D1 pin and the D2 pin of the TC35661 master control chip are connected with the peripheral crystal oscillator module;
the C2 pin of the TC35661 main control chip is grounded in digital, the first end of the first capacitor and the first end of the second capacitor are connected with the A7 pin and the H6 pin of the TC35661 main control chip, the second end of the first capacitor and the second end of the second capacitor are grounded in digital, the F3 pin, the F2 pin, the H1 pin, the H3 pin and the E2 pin of the TC35661 main control chip are grounded in analog, the third capacitor and the fourth capacitor are connected between the E1 pin and the analog ground of the TC35661 main control chip, the fifth capacitor and the sixth capacitor are connected between the H4 pin, the F1 pin and the G1 pin and the analog ground of the TC35661 main control chip, the first resistor is connected between the A8 pin and the digital ground of the TC35661 main control chip, the E5 pin, the E6 pin, the F5 pin and the F6 pin of the TC35661 main control chip are grounded in digital, the D4 pin and the G4 pin of the TC35661 main control chip are connected with analog ground, the H5 pin, the G5 pin and the G2 pin of the TC35661 main control chip are connected between the first driving signal input end of the Bluetooth circuit and the first end of the second resistor, the first end of the seventh capacitor, the first end of the eighth capacitor, the first end of the ninth capacitor and the first end of the tenth capacitor, the second end of the seventh capacitor, the second end of the eighth capacitor and the second end of the tenth capacitor are connected with analog ground, the A1 pin, the A6 pin and the H7 pin of the TC35661 main control chip are connected between the second driving signal input end of the Bluetooth circuit and the second end of the second resistor, the first end of the eleventh capacitor and the first end of the twelfth capacitor, a second terminal of the eleventh capacitor is connected with a second terminal of the twelfth capacitor to be digitally grounded;
the E7 pin of the TC35661 master control chip is the data transmitting end of the Bluetooth circuit, the F8 pin of the TC35661 master control chip is the data receiving end of the Bluetooth circuit, the third resistor is connected between the E8 pin of the TC35661 master control chip and digital ground, the D5 pin of the TC35661 master control chip is the reset signal input end of the Bluetooth circuit, the C7 pin of the TC35661 master control chip is the first interrupt signal input end of the Bluetooth circuit, the A4 pin of the TC35661 master control chip is the first state signal display end of the Bluetooth circuit, the G7 pin of the TC35661 master control chip is the enabling end of the Bluetooth circuit, the B5 pin of the TC35661 master control chip is connected with the data line of the Bluetooth circuit, the B6 pin of the TC35661 master control chip is connected with the clock signal line of the Bluetooth circuit, the B7 pin, the B8 pin, the C1 pin and the D3 pin of the TC35661 master control chip are grounded, and the E3 pin 35661, the E4 pin and the F4 pin are grounded.
2. The circuit of claim 1, wherein the band-pass filter comprises a DEA202450BT control chip, a high frequency inductor, a thirteenth capacitor, a fourteenth capacitor, and a fifteenth capacitor;
the first pin of the DEA202450BT control chip is a signal input end of the band-pass filter;
the second pin of the DEA202450BT control chip is grounded in an analog mode;
the fourth pin of the DEA202450BT control chip is grounded in an analog manner;
the third pin of the DEA202450BT control chip is connected with the first end of the high-frequency inductor and the first end of the thirteenth capacitor, the second end of the thirteenth capacitor is connected with the analog ground, the first end of the fourteenth capacitor and the first end of the fifteenth capacitor are connected with the second end of the high-frequency inductor, the second end of the fourteenth capacitor is connected with the analog ground, and the second end of the fifteenth capacitor is connected with the H2 pin of the TC35661 main control chip.
3. The circuit of claim 1, wherein the peripheral crystal module comprises an SMD3225 control chip, a fourth resistor, a sixteenth capacitor, and a seventeenth capacitor;
the second pin and the fourth pin of the SMD3225 control chip are grounded in an analog mode;
the fourth resistor is connected between the first pin and the third pin of the SMD3225 control chip, the sixteenth capacitor is connected between the first pin and the analog ground of the SMD3225 control chip, the seventeenth capacitor is connected between the third pin and the analog ground of the SMD3225 control chip, the first pin of the SMD3225 control chip is connected with the D1 pin of the TC35661 main control chip, and the third pin of the SMD3225 control chip is connected with the D2 pin of the TC35661 main control chip.
4. A POS comprising a bluetooth circuit according to any one of claims 1-3.
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| CN201711295154.8A CN108632792B (en) | 2017-12-08 | 2017-12-08 | Novel bluetooth circuit and POS machine |
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