On the Application of Low Energy Bluetooth Technology in Smart Mobile Devices
With the emergence of the USB protocol, peripherals of personal computers have sprung up. Similarly, as the latest open Bluetooth Low Energy (BLE) wireless application technology for smartphones, there are similarities and similarities. BLE technology makes it possible for electronic products to bridge smart phones. Compared with wireless technologies such as WIFI and Bluetooth 2.0, it has the advantages of low energy consumption, fast connection, and longer communication distance, so that the peripheral electronic devices of smart phones have a broader development prospect.
As a member of the International Bluetooth Alliance (BT-SIG), Texas Instruments (TI) launched the CC254X series of single-chip (SOC) low-power Bluetooth transceivers in 2012, with classic 51 cores. The strongest advantage lies in the rich peripherals ( 21 IO, UART, SPI, USB2.0, PWM, ADC, analog comparator, op-amp), ultra-wide working voltage (2v-3.6v), extremely low energy consumption (<0.4uA), extremely small Wake-up delay (4us).
In order to facilitate the transplantation and use of low-power Bluetooth (BLE) application technology in various industry products, China's TI wireless field strategic partner Xin Chida Technology has specially developed RF-CC2540TA1 low-power Bluetooth transparent transmission module (BQB certification) . The customer's existing products or solutions cooperate with this transparent transmission module, which can easily communicate with mobile devices such as iPhone 4S (need to support Bluetooth 4.0) to realize super intelligent control and management.
RF-CC2540TA1 low-power Bluetooth transparent transmission module, using TI's CC2540 as the core processor. The module runs on 2.4 GHz ISM band, GFSK modulation method (Gaussian frequency shift keying), 40 channels 2 MHz channel gap, 3 fixed broadcast channels, 37 adaptive automatic frequency hopping data channels, the physical layer can be compatible with classic Bluetooth The RF is combined into a dual-mode device, and the 2 MHz gap can better prevent interference from adjacent channels. Wide output power adjustment (-23 dBm～4dBm), -93 dBm high gain receiving sensitivity.
The RF-CC2540TA1 module is used as a bridge for smart phone peripherals, which makes the host-side application development extremely simple, and the client MCU is directly connected to the module through the serial port. After the module is started, it will automatically broadcast (broadcast cycle 250ms), and the mobile phone that has opened the specific APP will scan and dock it. After success, it can communicate with the mobile device through the universal serial port. The user can exchange data through the data channel, and even To control the communication parameters, the specific meaning of the data is defined by the upper application program. The mobile device can write to the module through the APP, and the written data will be sent to the customer's MCU through the serial port. After the module receives the data packet from the client MCU serial port, it will automatically forward it to the mobile device.
In addition, the module has a special test mode, which is convenient for testing the Bluetooth connection and communication between the module and the smart phone without a serial port connection. In order to speed up the development process of customers, Xin Chida Technology also provides a complete set of IOS-end test tool APP source code, customers only need to modify a little to develop their own APP.
The main features of this module:
1. It is convenient and quick to use, without any Bluetooth protocol stack application experience.
2. The user interface uses a universal serial port design, two-way reading, simple operation.
3. Support serial AT command to adjust the forwarding rate (dynamic power consumption adjustment), module naming.
4. The length of the serial port data packet can be any length below 200 bytes (including 200).
5. Support high-speed mode, theoretically up to 4K/S (20ms connection interval), and can work stably at 2.5K-2.8K.
6. Very low power consumption standby mode, sleep current 0.4uA.
The design purpose of this module is to quickly bridge electronic products and smart mobile devices, and can be widely used in various devices with this demand, such as instrumentation, logistics tracking, health care, smart home, sports and leisure, automotive electronics, etc. As Android smart devices accelerate the integration of BLE technology, the standard BLE for smart phones will surely become fashionable, and the market demand for mobile phone peripherals will multiply. Customers can use this to integrate existing solutions or products with the shortest development cycle, occupy the market at the fastest speed, and at the same time inject new technical forces into the development of the enterprise.
