When you calculate uA/MHz for nRF52832, which figures do you use?

[BodyBeacon]

I saw that DA14680 from Dialog comes with a 30uA/MHz processor.

Although the clock can be programmed up to 96MHz, the 30uA/MHz is measures at 16MHz.

How can I get a comparable figure for nRF52832?

[Øyvind Karlsen]

Hi,

When running from RAM the nRF52 also delivers 30µA/MHz(www.nordicsemi.com/.../nRF52-Series-SoC)

The µA/MHz measure does not include the use of the floating point calculations. Floating point calculations using the FPU in an M4F is roughly 20 times faster than the same calculation on the M0. This means lower power consumption. The nRF52 also has DMA to most peripherals, this means that you don't even need to use the CPU for many features, you can run directly from memory. In addition to that the nRF52 has cut peripheral power consumption in half compared to the nRF51.

Best regards,

Øyvind

[Øyvind Karlsen]

To compare chips you would need to know how often you want to transmit, and how much you need to calculate.

Then you sum the time you use in each state (TX/RX, processing and idle) multiplied with the power consumption of each case.