对于通信为中心的物联网设备的优化功率传输
为物联网设备和其他设备的供电环境(物联网)是复杂的。功耗是高度可变的,因为需要尽可能地节约能源。通常情况下,物联网设备花费大量的时间睡着了,因为这提供了最低的功耗-只有醒来时,他们需要采取测量或传输数据。即使清醒模式之间的差异可以显着。
例如,只有少数子系统可能需要清醒地读取一个A/D转换器的样本,这是一个传感器读取定期。然而,当通过蓝牙智能等无线链路发送数据时,从处理器到无线前端的大部分设备需要处于活动状态,并且处于相对高的功耗状态。
Although Bluetooth Smart has features to reduce energy consumption overall, it still requires 15 mA of current for the low-energy mode and 30 mW for the higher data rate mode. The need to support these different modes means a PMIC needs to be able to switch rapidly from an ultra-low energy quiescent state to one that delivers high currents for several milliseconds and then power the system down again equally quickly. This puts stringent demands on power delivery.
When a processor moves from one of its lowest-power sleep states to active mode, the difference in current calls for fast startup times and transient response from the power-delivery subsystem.
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