Pulse Width Modulation core
In addition to these PWM modes there is also a "Low Ripple DAC" mode that creates a minimum period pulse train whose High/Low average is that of the chosen duty cycle. When used with a low-pass filter (such as a simple RC circuit), a DAC can be created with far better bandwidth and ripple performance than a standard PWM algorithm can achieve. This type of DAC is ideally suited for fine tuning of power supply output levels.
CorePWM also provides support for tachometer monitoring of 3- and 4-wire fans. Incoming tachometer data is read by the firmware through the APB interface to calculate fan speed.
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