LILY-W1 series - System integration manual
UBX-15027600 - R09
System description
Page 12 of 64
C1 - Public
1.4.2
Module power-off
LILY-W1 modules can enter
Power Down
mode by asserting
PD-n
signal (logic level
0
) or power on
VCC/VCC_IO
can be removed to enter
Power Off
mode.
1.4.3
Wake-Up signals
LILY-W1 modules provide two wake-up signals to handle the low power modes:
•
WAKE_UP
: Host-to-module Wake-Up signal from Deep Sleep mode (input).
•
HOST_WKUP
: Module-to-host Wake-Up signal can be used to exit host from Deep Sleep modes
(output).
HOST_WKUP
signal is powered by
VCC_IO
voltage domain.
WAKE_UP
signal is powered by the
internal 1,8V
voltage domain.
Name
I/O
Description
Remark
WAKE_UP
I
Host-to-Module Wake-Up signal
Referenced to internal power domain.
HOST_WKUP
O
Module-to-Host Wake-Up signal
Table 5: Wake-up signal definition
1.4.4
Configuration signals
LILY-W1 series module uses the
USB/SDIO-n
pin as host interface configuration input to set the
desired operation mode following a Power on sequence. Strap configuration options are listed in Table
6.
USB/SDIO-n
signal is powered by the internal 1.8 V voltage domain and is used to determine
communication busses configuration and host-side drivers.
•
USB
mode (
USB/SDIO-n
pin not connected): Commands and data regarding Wi-Fi traffic will be
transferred via the USB bus.
•
SDIO
mode (
USB/SDIO-n
pin grounded): Commands and data regarding Wi-Fi traffic will be
transferred via the SDIO bus.
The designer must guarantee that the pin is properly set before the
PD-n
release.
Name
I/O
Description
Remarks
USB/SDIO-n
I
Interface selection pin
Referenced to internal power domain. Connect to ground for
SDIO. Leave open for USB.
Table 6: LILY-W1 host interface selection
1.5
Data communication interfaces
The LILY-W1 modules support SDIO Full-Speed or USB 2.0 Device as host interfaces and the Wi-Fi
traffic will always be communicated via one of these interfaces depending on the sampled value of
USB/SDIO-n
during module boot. See section 1.4.4 for additional information.
1.5.1
SDIO interface
LILY-W1 modules support a SDIO device interface that conforms to the industry standard SDIO Full-
Speed card specification and allows a host controller using the SDIO bus protocol to access the
wireless module. A module acts as a device on the SDIO bus.
Main features of the SDIO device interface are:
•
On-chip memory used for CIS
•
Supports 1-bit and 4-bit SDIO transfer modes at the full clock range of 0 to 50 MHz
•
Special interrupt register for information exchange