Power supply of MSP430F5232

Hi Jason,

Jason Kang said:

1. For MSP430F5232, all three powers VCC/AVcc/DVcc are tied together with two capacitors of 10uF and 0.1uF according to the reference design in the user manual (p.21/153 of SLAU278p). Is it a recommended power circuit design?

It is certainly recommended to tie the supplies together. AVcc is used as a supply or reference for the analog peripherals, like the ADC and DAC. It can be different than Vcc but should not be more than 0.3V different (see note 1 on page 44 of the datasheet).

Jason Kang said:

2. I want to estimate the maximum power of the MSP430F5232. According to the table on page 46/104 of "SLAS897-Sept 2013", power can be estimated depending on its frequency when the Vcc is 3.0V. By the way, I am planning to use 3.3V of Vcc. In that case, is there a way of estimating its maximum power? Or is the power going to be very similar to the values shown in the table? 

If you have evaluation hardware available you to, you could test this out yourself by using an ampmeter in series with your digital power supply and observing the current consumption. This current is also dependent on which peripherals you are using at the time, so there is some variability from usecase to usecase.

You should expect a lightly higher, but comparable, current consumption at 3.3V than 3V.

Thanks,

Ian