Calculating current

[Yano]

Hi, we are trying to calculate operational current. Does anyone know what the test voltage is in nRF51422_PS v3.1. I assume for typical it's 3.0V and Max is 3.6V? Also is the 1.7V reg used for flash operation and therefore running from RAM saves the 105uA? and lastly what is the power used by the 1.2V reg, there is only a specification with an oscillator and it does not show 32768Hz? Thanks

[Stefan Birnir Sverrisson]

Hi

For current consumption considerations, look at the current consumpiton guide.

For information on how the LDO and DCDC handle current, look at this thread.

For recommendations for using the DCDC mode, look at this thread.

For the current consumption of 1.2V regulator, you can see that in table 32 in the nRF51822 PS v3.1. The current consumption of the regulator is not stated directly but a combined current consumption for the 1.2V regulator and whatever high frequency oscillator is running at the same time. This is relevant because the 1.2V regulator only requires to run when the HFCLK oscillator runs with it, see the peripheral resource requirements in table 33.

Yes, voltage range of the nRF51 is 1.8V - 3.6V.

Correct, the flash requires the 1.7V regulator and that regulator adds the 105uA current. However, the extra consumption when executing code from flash compared to RAM is 4.1-2.4=1.7mA.