Bluetooth40, the secret of low power consumption tws earbuds reset

Why is low-power Bluetooth so power-saving? According to the official SIG conference information, compared with the classic Bluetooth technology, the main changes are mainly reflected in the reduction of standby power consumption, the realization of high-speed connection and the reduction of peak power. bjbjaudio.com

Reduction in standby power consumption
Traditional Bluetooth technology often uses 16~32 channels for broadcasting, while low-power Bluetooth only uses 3 broadcasting channels, and the radio frequency turn-on time during each broadcast is also reduced from the traditional 22.5ms to 0.6~1.2ms. These two The change in the protocol specification obviously greatly reduces the standby power consumption caused by broadcast data: In addition, Bluetooth Low Energy is designed to replace the idle state of traditional Bluetooth with a deep sleep state. In the deep sleep state, the host is in the ultra-low The duty cycle (DutyCycle) state is only activated by the controller when it needs to operate. Because the host consumes more energy than the controller, this design also saves the most energy: in the deep sleep state, the protocol also targets This communication mode is optimized, the data sending interval is also increased to 0.5~4s, the amount of data sent by sensor applications is much less than usual, and all connections use ad vanced sniff-subrating (sniff-subrating) function Therefore, the RF energy consumption at this time is almost negligible. Combining the above factors, the standby power consumption of low-power Bluetooth is much lower than that of traditional Bluetooth. bjbjaudio.com    <a style="opacity:0.0;color:#ffffff">tws earbuds reset</a> <a style="opacity:0.0;color:#ffffff">tws earbuds reset</a>

Implementation of high-speed connections
According to the specification of the traditional Bluetooth protocol, if a Bluetooth device is broadcasting, it does not
It will respond to the currently ongoing device scan, and the low-power Bluetooth protocol specification allows the device that is broadcasting to connect to the device being scanned, which effectively avoids repeated scanning, and through the improvement of the connection mechanism, low-power Bluetooth The device connection establishment process can be controlled to be completed within 3ms, at the same time, the link can be quickly started by the application, and the approved data transfer can be completed at a transmission speed of several milliseconds, and the connection will be closed immediately, while under the traditional Bluetooth protocol, even if only It takes 100ms to establish a link layer connection, and it takes longer to establish a connection at the L2CAP (Logical Link Control and Adaptation Protocol) layer. The Bluetooth low energy protocol also optimizes the topology, enabling hundreds of millions of devices to be connected simultaneously by using a 32-bit access addr ess on each slave device and each data packet. This technology not only optimizes the traditional one-to-one connection of Bluetooth, but also uses the star topology to complete the one-to-multipoint connection. In application scenarios where connections and new line switching are rapid, data can be moved between mesh topologies without being too complex to maintain the network, which also effectively reduces connection complexity and connection establishment time. bjbjaudio.com       <a style="opacity:0.0;color:#ffffff">tws earbuds reset</a>

reduce peak power
Bluetooth Low Energy defines the data packet length more strictly, supports ultra-short (8~27Byte) data packets, and uses random radio frequency parameters and increases the GSFK modulation index. These measures minimize the complexity of data transmission and reception. In addition, low-power Bluetooth also increases the modulation index and adopts 24-bit CRC (Cyclic Redundancy Check) to ensure that the packet has greater stability when disturbed, and the range of low-power Bluetooth increases to more than 100m. The above measures, combined with the traditional frequency hopping principle of Bluetooth, effectively reduce the peak power. bjbjaudio.com

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