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Energy-saving IoT designs

Focus on energy consumption

With the advent of the Internet of Things (IoT), embedded designers focus their attention and efforts more than ever on the energy consumption of the system. A prime example is a wireless sensor node - a relatively simple device from a functional point of view that has to do its job for an extended period of time (in some cases years) while being powered by a battery.

IoT designs with system power management

Design considerations include key system elements such as the microcontroller (MCU), wireless interface, sensor, and system power management. For more complex systems, an integrated power management circuit (PMIC) allows more precise control of the entire system. From a single power source, you can generate multiple voltage rails to drive various elements of the embedded system, and adjust each voltage rail to provide just enough power for the application. A PMIC may also provide additional functions for general system control, such as: B. Watchdog timer and reset functions. The Power Management Interface system is available for IoT applications.

The system power management interface

The SPMI interface is a power management standard for mobile electronics. This two-wire, serial interface is optimized for energy management and general control tasks. It is sufficiently flexible in terms of the clock frequencies, which can be between 32 kHz and 26 MHz, without the individual components having to be synchronized with one another. The participants connected to the control bus are assigned to different classes. There is the master and two different slaves, one of which can send a request, the other cannot. The individual components connected to the bus have equal arbitration and the data traffic can be controlled by prioritization. The specification also reduces design costs and accelerates mobile device time to market by making it easier to connect devices from different manufacturers. It is used in smartphones, tablets, and other portable devices.

Features of SPMI

The interface connects the integrated power regulator of a system-on-chip processor system (SoC) to one or more power management IC voltage regulation systems. The interface can be used to closely monitor and control the processor performance levels required for a particular workload or application and to dynamically control the various supply voltages based on the performance levels in real time.

Features include low pin count and low gate count, high speed, low latency, the ability to support multiple processor devices on the same shared bus, priority management by traffic class, and command acknowledgment.

Protocol Analyzer für SPMI IoT Designs