Datasheet

DP83848VYB
SNLS266D –MAY 2007–REVISED APRIL 2013 www.ti.com
9.6 ENERGY DETECT MODE
When Energy Detect is enabled and there is no activity on the cable, the DP83848VYB will remain in a
low power mode while monitoring the transmission line. Activity on the line will cause the DP83848VYB to
go through a normal power up sequence. Regardless of cable activity, the DP83848VYB will occasionally
wake up the transmitter to put ED pulses on the line, but will otherwise draw as little power as possible.
Energy detect functionality is controlled via register Energy Detect Control (EDCR), address 0x1Dh.
9.7 THERMAL Vias RECOMMENDATION
The following thermal via guidelines apply to GNDPAD, pin 49:
1. Thermal via size = 0.2 mm
2. Recommend 4 vias
3. Vias have a center to center separation of 2 mm.
Adherence to this guideline is required to achieve the intended operating temperature range of the device.
Figure 9-4 illustrates an example layout.
Figure 9-4. Top View, Thermal Vias for GNDPAD, Pin 49
56 Design Guidelines Copyright © 2007–2013, Texas Instruments Incorporated
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