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Low-power system design with AIROC™ Wi-Fi & Bluetooth® combo
chip and PSoC™ 6 MCU
Bluetooth® power optimization techniques
4
Bluetooth® power optimization techniques
AIROC™ CYW43012 Wi-Fi & Bluetooth® combo chip supports a Bluetooth® 5.0 BR/EDR/Bluetooth® LE radio. This
section describes the power optimization techniques.
Common operations related to power consumption in a Bluetooth® LE application include advertisement and
connection events. It is discussed how to optimize various parameters related to both advertisement and
connection events to reduce power consumption. This section assumes that you are familiar with Bluetooth®
LE fundamentals. See Vol 6: "Core System package [Low Energy Controller]" of the latest
specification
for Bluetooth® LE fundamentals.
4.1
Advertisement events
Advertisement events broadcast the capabilities of a Bluetooth® LE Peripheral device to Bluetooth® LE Central
devices listening to the events. These events can constitute the major portion of a Bluetooth® device's battery
consumption, if not carefully chosen. The interval between two successive advertisement events from the
Peripheral forms the advertising interval; it can be fixed or a random value between a min and max interval.
To achieve the lowest possible power during advertisement events, you should maximize the advertising
interval. However, a larger advertising interval will lead to a longer detection time at the Central device and a
subsequently longer time for getting connected to the Central. The advertising interval should be between 20
ms and 10.24 seconds. In addition, having the advertisement interval between a min and max not only
improves the tradeoff between power and latency, but also improves the detection probability in noisy
environments by randomizing the time at which an advertisement packet is sent out.
Table 5
Advertising interval selection
Application requirement
The application requires shorter detection and connection establishment
periods such as audio devices or devices that send real-time data.
The application does not have aggressive connection requirements but
still prefers low latency such as fitness trackers or smart watches.
The application does not care about latency; power consumption is of
more importance, such as in the case of beacons.
In addition to advertisement interval, the amount of data transmitted during advertisement impacts the power
consumption during advertisement events. The smaller the advertisement payload, the lower the power
consumption.
Bluetooth® Configurator
The Bluetooth® peripheral has an additional configurator called the "Bluetooth® Configurator"; used to
generate the AIROC™ Bluetooth® LE GATT database and various Bluetooth® settings for the application. These
settings are stored in the file named design.cybt. Note that, unlike the Device Configurator, the Bluetooth®
Configurator settings and files are local to each respective application.
For detailed information on how to use the Bluetooth® Configurator, see the
Application note
Bluetooth® Configurator
23
Bluetooth® Core
Suggested advertisement
interval
20 to 100 ms
100 to 1000 ms
1000 to 10000 ms
guide.
002-27910 Rev. *C
2023-05-29
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