CC1100/CC1101无线唤醒WOR示例：超低功耗应用教程

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本资源是一份由Chipcon发布的应用笔记AN038，名为"CC1100/CC2500 - Wake-on-Radio (Rev.1.0)"，专注于 Chipcon CC1100 和 CC2500 RF收发器的无线唤醒功能（WOR）在超低功耗无线应用中的实现。CC1100/CC2500 是一款低成本、高度集成的多通道无线通信芯片，它提供的WOR功能旨在简化低功耗接收器（RX）自动轮询过程，从而为设计节能的超低功耗系统提供了一个理想的起点。该应用笔记详细介绍了如何利用CC1100/CC2500芯片的WOR特性，这些芯片是CC1100/CC1150DK和CC2500/CC2550DK开发套件的一部分。文章中提供的示例代码展示了如何构建一个基础的无线遥控系统，目的是通过实际操作展示WOR功能的使用技巧和重要注意事项。它包括一个包突发传输器的设计以及一个WOR接收器的实现，以便用户可以理解在实际应用中如何有效地利用这个功能。通过阅读这份文档，用户可以学习到以下关键知识点： 1. **WOR功能原理**：理解WOR如何在无线设备间实现远程唤醒，即接收器可以在接收到特定信号后自动从休眠模式切换到接收状态。 2. **CC1100/CC2500架构**：了解这些芯片的特性和接口，包括如何配置和控制WOR唤醒条件。 3. **示例程序设计**：学习如何编写和调试代码来实现WOR唤醒，包括发送唤醒信号的编码和接收端的响应处理。 4. **低功耗优化**：识别如何在设计中考虑到电池寿命和整体系统功耗，以最大化WOR的节能效果。 5. **应用场景实践**：通过实例了解WOR在无线遥控或传感器网络中的具体应用场景，以及可能遇到的问题与解决方案。这份应用笔记提供了丰富的技术指导，对希望利用CC1100/CC2500进行WOR功能开发的工程师来说，是一个实用且深入的学习资源。

Chipcon

Application Note

038

Chipcon AS AN038 CC1100/CC2500 – Wake-on-Radio (Rev. 1.0) Page 3 of 14

3 Wake-on-Radio (WOR)

3.1 WOR priciples

For many battery operated (point-to-point) communication systems without the need of

constant throughput, but with strict demands of power-efficiency, the simple configuration with

an “always-on” receiver and an infrequently transmitting station will in most cases not fulfill

the desired power budget. By using the principle of receive mode (RX) polling, the reduction

of the RX duty cycle obtained makes low-power applications feasible, especially in

asymmetric systems where all units do not have equal requirements for low power

consumption. In addition, to minimize the power consumption, it is a good idea to put the

radio in a power-saving sleep state in between the RX polling periods by disabling all

functionality that is not necessary at that time.

The advantage with WOR is that the RX polling is fully automated by the radio and there is no

need for the microcontroller (MCU) to interfere (strobe RX commands). This means that also

the MCU can stay in power-down mode and further save power while waiting for a packet.

The MCU will only have to wake up when the radio actually detects a packet – it only has to

Wake-on-Radio activity. This is the reason WOR is a useful feature for power-saving

applications.

3.2 WOR and CC1100/CC2500

The Wake-on-Radio functionality of

CC1100/CC2500

enables it to stay in a power-saving

SLEEP state and periodically wake up from deep sleep and listen for incoming packets in RX

without microcontroller interaction. The programmable wake-up period is controlled by a

WOR timer, run by an internal RC oscillator. This implies that the RC oscillator must be

enabled before the WOR strobe command can be used.

The radio’s configurable GDO pins are used to signal the interrupts intended for the MCU on

the desired event. For instance, if a sync word is detected during the RX period, the

CC1100/CC2500

can trigger an interrupt to wake up the MCU. The MCU can then make a

decision on what to do next; e.g. switch to TX and send an ACK or, if the CRC of the received

packet failed, continue in WOR mode (go back to SLEEP). In the latter case, after a packet

has been received, the radio will always go to the IDLE state. That means that if it is desirable

to continue in WOR mode, the MCU manually has to strobe another WOR command on the

SPI.

If no sync word is detected while in RX, a programmable RX timeout will make the chip

automatically return to sleep mode and continue in WOR mode without interrupting the MCU.

The Wake-on-Radio functionality may also be used in combination with

CC1100/CC2500

’s

RX_TIME_RSSI function. This function will perform an initial RSSI level measurement when

entering RX mode, and if the RSSI value does not exceed a programmable threshold, the RX

will terminate immediately and return to SLEEP – still in WOR mode. This function can reduce

the time in RX and contribute to lower power consumption if no signal is present.

The

CC1100

offers two different methods of using WOR – with or without the automatic

synchronization feature, while

CC2500

offers only WOR without autosync. This application

note will only look at WOR applications not using autosync.

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