When you read some pdf datasheet

/en/linux/blog/ mediateklow-powerpdfdatasheet

22/December/2020

authorRentaro

Looking for whatever with low power consumption.
Found modules on mediatek, download documentation for SoM (System on Module).
You scroll through in search of how much the chip consumes.

Finally you have found the complete version of the documentation.

Icc33 - peripherals including eth, wifi
Icc12 - processor core
Icc18 - memory power

Let’s estimate the average value for mt7628 (let’s say wifi consumes 0.1A for 3.3V)
For verification we use the documentation for SkyLab SKW92, built on mt7628.

(0.15A * 1.2V) + (0.05A * 1.8V) + (0.1A * 3.3V) = 0.6Wh / 3.3V = 0.181mA for 3.3V,
This roughly corresponds to SkyLab SKW92A

We estimate the maximum (approximate) values (Icc wifi = 0.5A)

(0.35A * 1.2V) + (0.1A * 1.8V) + (0.1A * 3.3V) = 2.25Wh / 3.3V = 0.68A at 3.3V,
which is also similar to the given 0.65A