Table of Contents
Advertisement
Intel® PRO/Wireless 2100 and Bluetooth Design Requirements
that if implementing Wake on Bluetooth or Selective Suspend an appropriate power rail should be
selected. See Section 12.3 and section 12.4 for details. The Fishhook reference board provides
multiple power delivery solutions for the Bluetooth module including a 3.3-V source from the CRB
and a 3.3-V source derived from the 5-V USB power rail.
12.3.
Selective Suspend Support
USB based Bluetooth modules that plan to support the Microsoft Selective Suspend feature must be
self-powered. Selective Suspend allows the processor to enter the C3/C4 state with the presence of a
USB based Bluetooth module. The USB power rail is not a sufficient source for a self-powered
module. The power rail must be always on in system states S0, S1 and S2 for a self-powered device.
Generally it is recommended for all internal USB devices (in this case the Bluetooth module) to self-
powered for best power efficiency and to be capable of waking up the system. For more information
refer to:
"Power saving of using USB selective Suspend Support" published in
http://www.intel.com/design/mobile/platform/downloads/Power_Saving_USB_Selective_Suspend.pdf
12.4.
Wake on Bluetooth Requirements
WoBT (Wake on Bluetooth) provides a method for the Bluetooth module to wake the system upon
Bluetooth device activity. This functionality is similar to Wake on LAN. Support for WoBT requires
the device to be self-powered and the power rail to be always on in system states S0-S4. The same
signal used for WOL (Wake on LAN) is planned for use by the WoBT signal. This is a point to point
interface and does not require any interface logic. There are no trace length or spacing requirements
for this low speed signal.
12.5.
RF Disable Support Requirements for Intel
PRO/Wireless 2100 and Bluetooth Devices
The RF Disable interface to the Intel PRO/Wireless 2100 module occurs via pin 13 of the mini-PCI
connector. This interface provides support to disable the Intel PRO/Wireless 2100 radio through
methods including, but not limited to, an external mechanical switch or button on the notebook or
through an embedded controller. This is an active low signal which provides the ability to disable the
RF portions of Intel PRO/Wireless 2100. The Intel PRO/Wireless 2100 radio remains disabled until
RF_KILL# is unasserted.
272
®
Intel
855PM Chipset Platform Design Guide
R
Advertisement
Table of Contents
