BUCKEN Pin as IOVDD Enable for nRF7000

[Alex0123]

Hello all,

I am using the nRF52840 together with the nRF7000.
To save GPIOs, I would like to use the BUCKEN pin (which is directly connected to the nRF7000) also as the enable signal for the IOVDD switch.

I have taken the timing requirements into account by using an IOVDD load switch with a 5 ms turn-on delay to ensure proper power sequencing.

Is this configuration supported, or could this cause any issues (e.g., related to timing, startup behavior, or internal state of the nRF7000)?

[Priyanka]

Hi Alex,

You configuration looks fine, since the documentation states that:

nRF7000 can be powered up/down from a host dynamically. This dynamic control uses the BUCKEN pin
and an external switch to control the IOVDD supply. Both the BUCKEN pin and the external switch control
are driven from a GPIO on the host, controlled by the Wi-Fi driver.

Also, the following is the power up sequence:

• Supply VBAT/BUCKVBAT/BUCKVBATS/AFEVBAT

• Wait ≥ 6 ms

• Assert BUCKEN

• Wait ≥ 1 ms

• Supply IOVDD

Since you follow the timing (you have in-place a 5ms delay between the BUCKEN and IOVDD assertion), I guess your configuration should work well.

-Priyanka

[Alex0123]

Thank you, Priyanka