![]() ![]() In normal mode, the MAX34407 samples at a rate of 1024sps. The host can then retrieve data at any time interval, and the transfer occurs without missing a sample. With an I 2C/SMBus command from the host, the device transfers the accumulated power samples and count to a set of registers available to the host. The MAX34407 doesn’t need an external sample clock, so, with an automatic sequencer and integrated oscillator, the chip is fully autonomous. The power values are added and stored in a 48-bit register, and the count of instantaneous power samples accumulated is stored in a 24-bit register. To generate a 28-bit power value for each sample pair, these voltage and current samples are multiplied on-chip. Using a multiplexer, current-sense amplifier, and 12-bit ADC, the MAX34407 automatically collects current and voltage samples from four channels. MAX34407 power accumulator block diagram. Figure 1, which depicts a MAX34407 block diagram, provides an example of this process.įigure 1. The chip stores the accumulated power and sample count information. To obtain an accumulated power value, power accumulators measure voltage and current samples, multiply them for a power reading, and add multiple readings. Power accumulators are a better option here because they have the accumulation feature integrated to provide a system host with average power readings. This is why traditional power monitors are not ideal for average power measurements. Power monitors would need additional processing to perform this kind of measurement, a difficult endeavor for systems with limited processing capacity. In these situations, instantaneous power readings must be accumulated over a specified time interval in order to generate an average power measurement. However, average power calls for greater computation. Power monitors, which sample the voltage and current of a rail to generate an instantaneous power measurement, are often used in systems that constantly monitor the peak power of a system rail. Real-time power consumption data enables a system to perform dynamic optimization to prolong battery life. ![]() Measuring the power consumed by critical system rails in an electrical system provides telemetry of vital system functions. This application note discusses various applications where a power accumulator can be invaluable in delivering critical, real-time power measurements. The logged data can be leveraged for continuous system design improvement. Power accumulation also facilitates rapid prototyping by monitoring various system rails during development. By extending this approach to multiple rails, you can monitor power management integrated circuits (PMICs) in battery-powered, high-density systems. Consider real-time measurement of switching converter efficiency, which allows converter efficiency evaluation over time and under varying operating conditions. For many applications that need average power measurement, power accumulators are a good solution. ![]()
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