【正文】 and then carry on the amplifier and filtering processing. The result of the treatment as a data acquisition circuit of input signal. (2) the data acquisition. Data acquisition circuit is the function of the signal conversion circuit output analog signal is converted to a digital signal (data sequence), and then the digital signal output to CPU, in order to carry on corresponding processing. (3) data processing. Intelligent sensor data processing function in general are not uniform. Normally, need digital filter can. Some intelligent sensor also need to other signal processing, such as signal amplitude of the criterion, signal feature extraction, display treatment etc. In a word, according to the different fields of application, data processing requirements is not the same. (4) the data transmission. In the control system, intelligent sensor collection and sorting good data, need to transfer to the core of the system controller or other control unit. Due to the characteristics of the control system, the data transmission generally need to pass a space distance, therefore, need to use special circuit and the way to realize data transmission. For example, to encode data processing, the use of current ring or RS232 and transmission. In the existing control system, the vast majority of cases are using cable transmission way realization sensor and control system of the connection. For intelligent sensor for, transmission data quantity generally and is not very big (such as pressure, temperature sensor and so on), therefore, meet the need of the intelligent sensor embedded bluetooth SoC device, does not need very large storage capacity。 The other is a and baseband processing part directly connected audio interface to transfer audio data. In the bluetooth protocol stack, HCI above part usually use software to realize, including the logical link control and adaptive agreement L2CAP, serial simulation RFCOMM, link management protocol (LMP), telephone alternative agreement and choose agreement。 Intelligent sensor bluetooth technology and SoC structure design Bluetooth technology is a kind of wireless data and digital munication open standard .It with low cost, close the wireless connection as the foundation, It established a plete munication mode and technology for fixed and mobile equipment . The essence of the bluetooth technology is to establish a universal wireless interface and control software standards and mobile munication and puter work can realize seamless connection between, Thus, for different manufacturer production of portable equipment provides a close (10 m ~ 100 m) within the scope of the interoperability channel. In the industrial control system and many application areas, with the development of electronic technology, the controller and sensor has been realized general sensor or test instrument, the use of CPU under the control of digital technology, therefore, many control system or sensor system has been realized digital transmission. If in the digital control system and sensor embedded bluetooth technology, it can realize system data and control mand wireless transmission, this for many applications are very important. 1 bluetooth protocol stack Bluetooth specification version for the following provisions : (1) the bluetooth work in universal GHz ISM (Industrial, Scientific and Medical) free of charge, free application radio frequency band. (2) the rapid recognition and frequency hopping technology, to ensure the stability of the link. (3) using binary frequency modulation (FM) technology of frequency hopping transceiver, restrain interference and prevent fading. (4) using forward error correction (FEC) technology, restrain long link of random noise. (5) data transmission rate is 1 MB/s. (6) the timedivision duplex transmission, its baseband protocol is circuit switching and packet switching bination. (7) a jump carrier frequency sends a synchronous group, each group take a time slot, also can be extended to five timeslot. (8)support an asynchronous data channel, or three concurrent synchronous voice channel, or a transmit asynchronous data and synchronous speech channel. Every voice channel support 64 KBPS synchronous voice. Asynchronous channel support maximum rate for 721 Kbps, reverse response rate is Kbps asymmetric connections, or is BPS symmetry connection. At present, the work in GHz frequency band of the wireless LAN technology, in addition to the bluetooth technology outside, still have a , HomeRF and infrared technology. In general, is suitable for the office wireless work, HomeRF suitable for family to the mobile data, voice equipment and munication between host and bluetooth technology can be applied to any allow wireless way replacement cable occasions. Bluetooth protocol stack design only conform to the bluetooth specification requirements, to realize the seamless joint between different manufacturers. Bluetooth specification (specification) including protocol (protocol) and application of standard profile two parts. Complete bluetooth protocol stack. Protocol specification defines each function element way of working, provide the bluetooth technology in the realization of function between the elements of the lateral system structure. It introduces the application of standard achieving specific application model, describes the coope