CN105022325A

CN105022325A - Interface circuit for BT40

Info

Publication number: CN105022325A
Application number: CN201510509116.2A
Authority: CN
Inventors: 徐卫军
Original assignee: Nst Chip Technology Ltd
Current assignee: Nst Chip Technology Ltd
Priority date: 2015-08-18
Filing date: 2015-08-18
Publication date: 2015-11-04

Abstract

The invention relates to an interface circuit, and particularly relates to an interface circuit for BT40. Specifically, the invention relates to a BT40 interface circuit which is convenient for expansion and application, and belongs to the technical field of bluetooth chips. According to the technical scheme of the invention, the interface circuit for BT40 comprises a baseband processing controller used for realizing a baseband processing ability, wherein the baseband processing controller is provided with an expansion connection port used for being connected with external expansion, and the expansion connection port comprises an SPI serial port used for data configuration and an interrupt interface used for interrupt processing. The baseband processing controller of the interface circuit is connected and communicated with an external microcontroller through the SPI serial port and the interrupt port, thereby being capable of simplifying the interface circuit to the maximum degree, being convenient for expansion and packaging of a BT40 chip, expanding the application range, and being safe and reliable.

Description

For the interface circuit of BT40

Technical field

The present invention relates to a kind of interface circuit, especially a kind of interface circuit for BT40, specifically a kind of BT40 interface circuit being convenient to expand and apply, belongs to the technical field of Bluetooth chip.

Background technology

Bluetooth 4.0(BT40) technology compares with the Bluetooth technology of version before, the most significant advantage significantly reduces stand-by power consumption, can use with a button cell and exceed one-year age, therefore be also referred to as low-power consumption bluetooth (BLE: Bluetooth Low Energy).At present, what existing BT40 chip had comprises SOC, also have not with microprocessor, but it is comparatively complicated no matter to adopt which kind of form all to there is structure, is unfavorable for Function Extension when using.

Summary of the invention

The object of the invention is to overcome the deficiencies in the prior art, the interface circuit of a kind of BT40 is provided, its compact conformation, be convenient to carry out Function Extension with external chip, improve accommodation, safe and reliable.

According to technical scheme provided by the invention, the described interface circuit for BT40, comprises the Base-Band Processing controller for realizing base band processing capacity; Described Base-Band Processing controller is arranged and is used for expanding with outside the expansion connectivity port be connected, described expansion connectivity port comprises for the SPI serial ports of data configuration and the interrupt interface for interrupt processing.

SPI serial ports on described Base-Band Processing controller comprises selects line SPI_SS port, main output from input MOSI port, primary input from output MISO port and clock SPI_CLK port, and interruptive port comprises Event_int port and the Wakeup_int port for waking up.

Described Base-Band Processing controller also respectively with the GFSK radiating circuit for launching and the GFSK receiving circuit for receiving, Base-Band Processing controller is also connected with the analog pll circuit for carrying out frequency control and RF frequency synthesizer, and analog pll circuit and RF frequency synthesizer are all connected with GFSK radiating circuit, GFSK receiving circuit.

The output terminal of described GFSK radiating circuit, the input end of GFSK receiving circuit are connected with multidiameter option switch, and the selection control end of described multidiameter option switch is connected with Base-Band Processing controller.

Advantage of the present invention: Base-Band Processing controller passes through the microcontroller connecting communication of SPI serial ports and interruptive port and outside, farthest can simplify interface circuit, be convenient to expansion and the encapsulation of BT40 chip, improves accommodation, safe and reliable.

Accompanying drawing explanation

Fig. 1 is structured flowchart of the present invention.

Description of reference numerals: 100-Base-Band Processing controller, 101-power output circuit, 102-GFSK radiating circuit, 103-RF frequency synthesizer, 104-multidiameter option switch, 105-GFSK receiving circuit, 106-first crystal oscillating circuit, 107-grounding ports, 108-second crystal oscillating circuit and 109-analog pll circuit.

Embodiment

Below in conjunction with concrete drawings and Examples, the invention will be further described.

As shown in Figure 1: for the ease of carrying out Function Extension with external chip, improving accommodation, the present invention includes the Base-Band Processing controller 100 for realizing base band processing capacity; Described Base-Band Processing controller 100 is arranged and is used for expanding with outside the expansion connectivity port be connected, described expansion connectivity port comprises for the SPI serial ports of data configuration and the interrupt interface for interrupt processing.

Particularly, Base-Band Processing controller 100 can realize the digital base band processor ability of bluetooth, data store and the ability such as state machine, the concrete structure of Base-Band Processing controller 100 known by the art personnel, repeat no more herein.SPI serial ports on described Base-Band Processing controller 100 comprises selects line SPI_SS port, main output from input MOSI port, primary input from output MISO port and clock SPI_CLK port, and interruptive port comprises Event_int port and the Wakeup_int port for waking up.During concrete enforcement, Base-Band Processing controller 100 passes through controller or the peripheral device communication of SPI serial ports and interrupt interface and outside, farthest can simplify the interface hardware of BT40, be conducive to the Function Extension realizing BT40 chip, adapt to follow-up agreement upgrading and the exploitation of various application scenarios.

Further, described Base-Band Processing controller 100 also respectively with the GFSK radiating circuit 102 for launching and the GFSK receiving circuit 105 for receiving, Base-Band Processing controller 100 is also connected with analog pll circuit 109 and RF frequency synthesizer 103 for carrying out frequency control, and analog pll circuit 109 and RF frequency synthesizer 103 are all connected with GFSK radiating circuit 102, GFSK receiving circuit 105.

The output terminal of described GFSK radiating circuit 102, the input end of GFSK receiving circuit 105 are connected with multidiameter option switch 104, and the selection control end of described multidiameter option switch 104 is connected with Base-Band Processing controller 100.

In the embodiment of the present invention, interface circuit also comprises power output circuit 101, and power output circuit 101 can provide the working power of described interface circuit, also has grounding ports 107 in interface circuit.GFSK radiating circuit 102, GFSK receive circuit 105 under RF frequency synthesizer 103 and analog pll circuit 109 act on, realize transmission and the reception of GFSK modulation signal, specific constructive form and the course of work of GFSK radiating circuit 102, GFSK receiving circuit 105, RF frequency synthesizer 103, analog PLL 109 are known by the art personnel, repeat no more herein.

During concrete enforcement, in order to realize transmission or the acceptance of GFSK modulation signal, control multidiameter option switch 104 by Base-Band Processing controller 100 to carry out selection and determine, Base-Band Processing controller 100 is also connected with the first crystal oscillating circuit 106 and the second crystal oscillating circuit 108 respectively, simultaneously, RF frequency synthesizer 103, analog pll circuit 109 are also connected with the first crystal oscillating circuit 106 and the second crystal oscillating circuit 108 respectively, and concrete cooperating process, known by the art personnel, repeats no more herein.

Base-Band Processing controller 100 also comprises restarts RST_n port, baud rate clock BRCLK port, second crystal oscillating circuit 108 also forms XTAL0 port, XTAL1 port, by restarting RST_n port, baud rate clock BRCLK port, the second crystal oscillating circuit 108 also forms XTAL0 port, XTAL1 port can realize carrying out with outside control being effectively connected and controlling.

Base-Band Processing controller 100 of the present invention passes through the microcontroller connecting communication of SPI serial ports and interruptive port and outside, farthest can simplify interface circuit, be convenient to expansion and the encapsulation of BT40 chip, improves accommodation, safe and reliable.

Claims

1., for an interface circuit of BT40, comprise the Base-Band Processing controller (100) for realizing base band processing capacity; It is characterized in that: the upper setting of described Base-Band Processing controller (100) is used for expanding with outside the expansion connectivity port be connected, and described expansion connectivity port comprises for the SPI serial ports of data configuration and the interrupt interface for interrupt processing.

2. the interface circuit for BT40 according to claim 1, it is characterized in that: the SPI serial ports on described Base-Band Processing controller (100) comprises selects line SPI_SS port, main output from input MOSI port, primary input from output MISO port and clock SPI_CLK port, and interruptive port comprises Event_int port and the Wakeup_int port for waking up.

3. the interface circuit for BT40 according to claim 1, it is characterized in that: described Base-Band Processing controller (100) also respectively with the GFSK radiating circuit (102) for launching and the GFSK receiving circuit (105) for receiving, Base-Band Processing controller (100) is also connected with the analog pll circuit (109) for carrying out frequency control and RF frequency synthesizer (103), and analog pll circuit (109) and RF frequency synthesizer (103) are all connected with GFSK radiating circuit (102), GFSK receiving circuit (105).

4. the interface circuit for BT40 according to claim 3, it is characterized in that: the output terminal of described GFSK radiating circuit (102), the input end of GFSK receiving circuit (105) are connected with multidiameter option switch (104), and the selection control end of described multidiameter option switch (104) is connected with Base-Band Processing controller (100).