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AN-1460 Emulating the PowerWise Interface Using GPIOs and Software (Rev. A)

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PowerWise Interface (PWI) compatible Energy Management Units (EMUs) from Texas Instruments are flexible, highly integrated, and digitally programmable system power managers that can be used in a variety of applications. Controlling or programming the EMU in the system is achieved using the PWI open-standard (www.pwistandard.org). The method for using the PWI1.0 connected EMU in systems with a processor containing a hardware PWI master like the Advanced Power Controller (APC) is obvious (http://www.ti.com/ww/en/analog/power_management/powerwise-avs.shtml). Using the PWI connected EMU in a system where the processor does not contain a hardware-based PWI master is straight forward using a GPIO port and a PWI protocol software driver.