Test results

UM1063

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DocID018573 Rev 2

Note, in this case, the presence of the 2-finger during the classification phase and theT2P

signal now asserted (T2P is valid low).

7.3.2

Transition from PoE to auxiliary and auxiliary to PoE

Figure 18 shows the behavior of the PM8803 when commuting sources. The image depicts

the transition from PoE to an auxiliary source whose voltage is ~10 V lower then PoE. It can

be seen that when the auxiliary voltage is applied (SA pin goes above its threshold) the

current drawn from the PoE drops to a few milliAmps. Smooth transition occurs as can be

seen from the output voltage (blue line).

Figure 18. Switching between PoE and auxiliary source