When device is not supplied yet, pin RESETn shall be set to LOW and No HIGH voltage is expected to be applied to input pin LP_CLK.
Once power supplies have settled, a delay of 100µs is recommended before releasing pin RESETn to HIGH.
When powering down the device, it is recommended to set RESETn pin back to LOW before shutting down its power supplies.
The power down step sets the WF(M)200 in standby mode according to these two ways below:
Our lower MAC API command SHUT_DOWN allows to put the chip in standby mode.
Alternative way is to assert RESETn pin low, at the expense of slightly higher current consumption due to the internal 43kohms typ. pull-up resistor.
KBA: WF(M)200 Power up and Power down sequence
You could find some explanations in the section 10.3 Power On, Reset, and Boot in the WF200 datasheet :
https://www.silabs.com/documents/login/data-sheets/wf200-datasheet.pdf
Moreover there is also some details in https://www.silabs.com/documents/login/user-guides/ug382-wf200-hardware-design-ug.pdf in section 4,.
When device is not supplied yet, pin RESETn shall be set to LOW and No HIGH voltage is expected to be applied to input pin LP_CLK.
Once power supplies have settled, a delay of 100µs is recommended before releasing pin RESETn to HIGH.
When powering down the device, it is recommended to set RESETn pin back to LOW before shutting down its power supplies.
The power down step sets the WF(M)200 in standby mode according to these two ways below: