Which is the driver output impedance of the nRF52832?

RE: Which is the driver output impedance of the nRF52832?

Stian Røed Hafskjold — Wed, 01 Nov 2017 13:11:06 GMT

The SPI run current is the peripheral run current + HF clk + regulator run current + DMA bus current. Long story short, about 1.2mA when DCDC regulator is enabled, and 2mA if not enabled.

Then you have the current that drives the capacitive load on the pins which is given by I = f * V * C. So for an 8 MHz SCK, 3V VDD and 4 pF pad capacitance you get 0.1 mA on the SCK pin alone. The capacitive load will highly depend on PCB design. For the nRF5 DK I measured about 40pF, which gives an increase of about 1 mA on the SCK pin when running at 8 MHz.

RE: Which is the driver output impedance of the nRF52832?

User1321 — Mon, 30 Oct 2017 16:09:27 GMT

Mmm great, thank you! Is it stated somewhere the current consumption on the pins when configured as SPI pins? on the datasheet says the increase in the power consumption when the SPI is enabled but I assume that that is related to the overall system power consumption.

RE: Which is the driver output impedance of the nRF52832?

Stian Røed Hafskjold — Mon, 30 Oct 2017 13:36:43 GMT

Hi, the pin capacitance of the nRF52832 is 3pF. Please see here: infocenter.nordicsemi.com/.../gpio.html