【正文】 USB, UART or RS232 as hardware module and interface between the host. When the bluetooth module with USB, UART RS232 or any one of the interface and host connection, HCI interface upper munication protocol by host is responsible for processing, and the lower HCI interface munication protocol by the module of the baseband layer chip and RF chip is responsible for. According to the bluetooth standard, bluetooth system basic ponents including antenna, transceiver, baseband controller. Therefore, in the antenna, RF receive multiplier and baseband controller, under the support of bluetooth system position can be very flexible, can achieve a variety of different implementation scheme. Embedded bluetooth system is will RF and baseband part integrated on a single chip, single chip bluetooth hardware module structure. In the embedded bluetooth devices, hardware structure can be divided into link manager, link controller and RF module 3 parts, responsible for handling LMP layer, baseband layer and RF layer protocol. Link manager contains processing unit (CPU), memory, etc ponents. Link manager and baseband layer chip known collectively as link controller. RF module contains RF radio frequency emission ponents, and host connected interface is located in the link on the controller. In embedded scheme, bluetooth protocol upper software agreement also all curing in chip, chip through the USB or UART interface and application system connected. Because on chip embedded CPU, so, the embedded bluetooth system is actually a intelligent terminal, suitable for any device with CPU of the system. For example, intelligent sensor, want to add a single chip bluetooth device, it can form a bluetooth sensor for munication mode. It consists of micro processing unit (CPU), wireless transceiver (RF), baseband controller (BB), Flash Flash program memory), general asynchronous transceiver UART, universal serial interface and the USB bluetooth test module. The bluetooth baseband controller hardware module is the key to the bluetooth module. Its main function is on the microprocessor control which realize the bluetooth baseband part of all realtime processing functions, including is responsible for receiving bit flow symbol timing extraction and recovery。 But must consider bluetooth protocol to achieve the necessary program storage space. Bluetooth protocol stack processing software will take up more memory, so, we must carry on the simplified. At the same time, in order to ensure safe and reliable control system, also need to consider using user agreement alternative bluetooth defined treatment protocol. From the above analysis we can draw the conclusion: (1) intelligent sensor data transmission quantity is small, do not need to undertake pression or coding processing, can be installed in the 1 k bytes. (2) in order to ensure the safety and reliability of the control system, it is necessary to put the upper treatment protocol into user layer protocol, by the user to write. In order to design meet the intelligent sensor embedded bluetooth SoC structure of bluetooth protocol stack for a simplified treatment, only use the key agreement bluetooth protocol and alternative cable agreement. SoC of bluetooth protocol stack by software and hardware of two parts. The core in the agreement of baseband agreement by the hardware realization, and link management and other part use software to realize. All the relevant agreement software stored in ROM, the user use munication stack can directly call. It should be pointed out that, munication stack design as a whole, so called must also be whole call. In other words, the munication stack as a plete subroutine modules to call. According to the above conclusions, the paper proposes a kind of have to open the user agreement embedded bluetooth SoC modular structure. RF transceiver, baseband, controller and bluetooth protocol ROM posed bluetooth protocol stack. Bluetooth protocol stack in under the control of CPU plete munication tasks. Simplified embedded bluetooth protocol stack structure. The user application protocol by the user to design, to ensure the safety and reliability of the munication. In addition, the influence of the bluetooth protocol stack of LMP the corresponding simplified. In the application of intelligent sensor, the munication link is pared monly simple, therefore, LMP don39。 At the same time, through the use of the corresponding safety measures, can improve the reliability and safety of the system. This article analysis bluetooth protocol stack and intelligent sensor work characteristic , design of intelligent sensor embedded bluetooth protocol stack of SoC structure. In order to meet the application of intelligent sensor, embedded bluetooth SoC, CPU, memory and corresponding bus and external circuit should be open to the users. As for the user, as long as the appropriate design of sensor front end circuit, can form a bluetooth munication function of intelligent sensor. Because of bluetooth munication protocol operating functions have been stored in ROM, so users only need to call the corresponding software program can plete bluetooth munication. At the same time, the SoC of bluetooth protocol stack on the authentication and encryption part of open to the users, specific the authentication, encryption method and algorithm can be defined by the user to.