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# MSP430F449: Linearity of Processor frequency f(System) to Supply Voltage

Part Number: MSP430F449

Hello,

The DS page-37 tells the recommended operating condition for Processor frequency (signal MCLK) f(System). There are a table and the Figure 1.

The Figure 1 has a line between the two points:

(Supply Voltage, fSystem ) = (1.8V, 4.15MHz) and (3.6V, 8MHz).

Then, is it possible to expect the line between the two points are Linear or not ?

As the background, my customer asked me if the CPU works at 8MHz under Vcc=3.3V. We would like to decide the CPU clock frequency under the supply voltage which is not specified. • Hello,

many thanks for contacting us on this topic. Yes, the characteristic can be assumed as linear.

This means, translating the graph into a slope of the characteristic results in 2.138MHz/V slope. This means e.g. at 2.7V the specified maximum operating frequency would be fmax(2.7V) = 8MHz - (0.9V * 2.138MHz/V) = 6.075MHz.