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Bluetooth module working principle and module classification
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Time：2017-12-29 11:13:01
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Bluetooth module, is a PCBA integrated Bluetooth board for short-range wireless communication, according to the function is divided into Bluetooth data module and Bluetooth voice module. Bluetooth module is a set of integrated circuit chip Bluetooth basic functions for wireless network communications can be broadly divided into three types: data transmission module remote control module. General module has the properties of semi-finished products, is processed on a chip basis, so that subsequent applications more simple.
一、the relationship For the end user, the image of the point that: Bluetooth module is a semi-finished products, Bluetooth adapter is finished. Common Bluetooth adapter (also known as dongle) usbdongle, mainly for data transmission, but also a serial dongle; for special users, there are voice dongle, and so on; Bluetooth module under the agreement is divided into support for 1.1,1.2,2.0,3.0,4.0 The latter is usually compatible with the former products.
二、 the principle As a short-range wireless communication technology that replaces data cables, Bluetooth supports point-to-point and point-to-multipoint communication to wirelessly connect various data and voice devices in a home or office into a single Pico-net, Piconets can be further interconnected to form a scatter-net, enabling quick and easy communication between these connected devices. This article describes the implementation of the Bluetooth interface embedded digital signal processor OMAP5910, DSP analog signal sampling, and the A / D converted digital signal processing, transmission to the receiver through the Bluetooth interface, the same, the DSP on the Bluetooth receiver The digital signal to D / A conversion, as an analog signal.
Bluetooth signal transceiver using Bluetooth module. The Bluetooth module
三、the module classification Bluetooth module according to the standard points 1.2,2.0,2.1,4.0 and the latest 4.1 and 5.0.
Bluetooth module in accordance with the purpose to have a data Bluetooth module and voice Bluetooth module. The former finishes the wireless data transmission, the latter finishes the wireless data transmission of pronunciation and stereo audio.
Bluetooth module in accordance with the chip design to have flash version and ROM version. The former is generally BGA package, external flash, which is generally QFN package, external EEPROM.
Bluetooth module According to the chip manufacturers divided Broadcom Bluetooth module, Dell Bluetooth module, CSR Bluetooth module;
According to the purpose of the Bluetooth module is divided into data Bluetooth module, serial port Bluetooth module, voice Bluetooth module, car Bluetooth module;
Bluetooth module according to the power points CLASS1, CLASS2, CLASS3;
Bluetooth module according to the application and support agreement is divided into the classic Bluetooth module (BT) and low-power Bluetooth module (BLE);
According to the agreement of the Bluetooth module is divided into single-mode Bluetooth module and dual-mode Bluetooth module;
Bluetooth module according to the application is divided into Bluetooth data module and Bluetooth audio module;
Bluetooth module according to the temperature is divided into industrial and commercial grade.
四、the module interface Bluetooth module interface sub-serial interface, USB interface, digital IO port, analog IO port, SPI programming port and voice interface. Only need data transmission, the system architecture should try to use a serial interface (TTL level), so that the module on the market can support, such as the need for IO port, you need to be based on the need for Bluetooth software development, time cost and economy The cost is higher.
五、no module Bluetooth module is generally composed of chips, PCB boards, peripheral devices. Different Bluetooth modules due to the role and application of different module pin-out will be different.
六、application areas 1, wireless PC peripherals
2, wireless gamepad
3, wireless audio
4, remote control
5, consumer electronics
6, home automation
7, toys
8, personal health and entertainment
