External pull up/down needed on SPI ? [nrf52840 package WLCSP]

[E. Chevalier]

Hi, I use in my design a component which use the nRF52840 - WLCSP package.

I use SPI to connect the nRF to a SD card slot. With the package, I understand that pin K4 (P0.19) is for SPI_SCK and for 3 others signals I can use pin J4 ( P0.21), K3 (P0.22) and H5 (P0.23).

I also know that pins are internally configurable with pull up or pull down, but external pull up or pull down are they needed on those SPI outputs ?

Best regards,

[Jared]

Hi,

External pull up isn't needed except if the internal pull up of 13k ohm isn't strong enough for you application. In most applications 13k ohm is enough.

regards

Jared

[E. Chevalier]

Thanks Jared!