【正文】 t need to link to carry on plicated processing. This design, the main function of LMP by software. When need to use bluetooth munication to send data or receiving data, the user program just call LMP software module can. LMP agreement consists of two parts (1) software. Through the CPU to link to set and control, realize bluetooth connection, power control and the authentication and encryption, but also control bluetooth device controller circuit. (2) the hardware. LMP controller circuit in the operation of LMP software, control bluetooth device working condition (keep hold, dormancy park, breathing sniff and activities active). From the above module design results can be seen, the structure of the intelligent sensor with plete bluetooth munication function, at the same time, provide the user with the flexibility of application. For example, the LMP authentication and encryption method and algorithm pletely by the user to decide, providing the user reliability and safety of the system. In addition, due to the universal serial munication interface and test circuit of existence, for the user the system to provide the hardware test hardware support. According to the above analysis, we can get used to intelligent sensor embedded bluetooth SoC device circuit structure. The bluetooth protocol stack into the intelligent sensor, in order to control the system to provide the very flexible position way。 Group head and load cycle redundancy check (CRC), group head and charge forward error correction code FEC processing, encryption and decryption process, etc., and can provide from baseband controller to other chip interface, etc. RISC CPU usually adopts the structure of embedded microcontroller processor, such as ARM7TDMI microprocessor, can meet the bluetooth core agreement of highspeed processing and a large number of data bit stream processing. Flash memory used to store all of the baseband and link management protocol software. SRAM as CPU run space, in the work of the Flash software call SRAM in processing. Radio frequency transceiver is responsible for receiving or send high frequency munication signal. UART and USB interface is provided with to HCI host controller interface transmission layer physical connections, is the upper level protocol and bluetooth hardware modules munication channel. Bluetooth test module mainly provide wireless layer and base layer of authentication and consistency norms, but also management products production and aftersale test for optional module. 3 embedded bluetooth protocol stack structure design of SoC According to the above bluetooth protocol stack hardware structure can see, if use SoC structure design bluetooth protocol stack, it can realize embedded bluetooth munication module, and at the same time users to open internal CPU purpose, in the design of embedded bluetooth protocol SoC structure, need to consider the following questions (1) the data processing ability and speed. Data processing ability mainly reflected in two aspects: one is the data buffer memory scale, the other is a data processing algorithm to the extent of the support. Data processing speed is an important question. Data processing speed not only and system clock frequency about, still and CPU and internal bus is directly related to the structure. (2) the munication operation and system operation of the relationship. In the embedded bluetooth munication stack SoC, munication is a function of the system, SoC need to other features of the system. Due to the CPU serial structure characteristics, when the system needs at the same time enable munication function and other important function (such as the implementation of the data acquisition system operation, etc), you need to use appropriate methods to coordinate. In fact this is embedded bluetooth SoC device system real time problem. (3) power loss of the device. The design of SoC power loss is an important problem. In addition to the corresponding technology to achieve the minimum power loss problem outside, still must be through the system structure design reduce the system power loss. For power loss have special requirements of the system, low power design is an indispensable content. From the above three requirements, it is known that in the embedded bluetooth SoC, if the data throughput is larger, the need to consider the speed of data processing problem. User system CPU belongs to the serial work way, therefore, in the large amount of data munication process, how to fulfill the system of other functions, is SoC structure design of a important aspect. For example, the use of bluetooth transmission image, one of the munication system must keep continuous working state, and at the same time, but also needs in SoC design a lot of Flash memory. Because the images must be pressing and depressing, so, in keep munication continuous and image pression/depression of the two different operation, there must be sufficient coordination, the hardware parallel processing technology. In this case, the CPU is merely a operation control device, used to start or end a operation. Therefore, ought to be aimed at different types of applications appropriate design of SoC structure. For intelligent sensor, its basic functions are as follows. (1) signal conversion. This part of the circuit is the role of the corresponding physical quantity into voltage signal,