iPod IWIP3G User Guide - Page 174
Power Saving
UPC - 649241862819
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9.9 Power Saving SNIFF mode: Once a Bluetooth device is connected to a Piconet, it can enter one of three power saving modes. In SNIFF mode, the activity of a Bluetooth device is lowered, enabling it to listen at a reduced rate to the Piconet. The interval or period between SNIFF is configurable. The SNIFF mode is the least power efficient of all three power saving modes. Deep sleep: iWRAP supports a also a power saving mode called deep sleep. In deep sleep state the main processor is put into reduced operation mode and this radically affects the current consumption of WTxx modules. Deep sleep can be used in generally in two operational modes: iWRAP is in "idle" state i.e. no Bluetooth connections are active. iWRAP has active Bluetooth connections, which are in high sniff power saving modes. Deep sleep can reduce the current consumption to as low as 0.01mA. 174