When the ATWILC device is connected to the host using the SDIO bus, the host’s SDIO
controller initializes and then interrogates the ATWILC device’s SDIO controller. The
interrogation operation happens when the host is booting. If any SDIO device is powered
on after the host is booted, a rescan operation must be triggered to detect it.
The ATWILC device must be powered on by default at startup. For the ATWILC3000 Shield
Board, there is an RC network for powering on. This can be done by mounting the resistor
R312 with an approximate value of 120k in the location shown below on the ATWILC3000
Shield Board.Figure 4-1. SDIO Resistor on Shield
Board
Tip: If the ATWILC module
powers up automatically during the system boot, the rescan SDIO is not required
because the ATWILC SDIO initialization and interrogation is performed during the
system boot.
The online versions of the documents are provided as a courtesy. Verify all content and data in the device’s PDF documentation found on the device product page.
