Datasheet

LAN9514/LAN9514I
DS00002306A-page 16  2009-2016 Microchip Technology Inc.
current situation, the poly fuse will open. This will cause the cathode of the diode to go to 0_volts. The anode of the
diode will be at 0.7_volts, and the Schmidt trigger input will register this as a low, resulting in an overcurrent detection.
The open drain output does not interfere.
FIGURE 2-4: PORT POWER CONTROL WITH POLY FUSE
USB
Device
PRTCTL3
5V
Poly Fuse
LAN9514/
LAN9514i
USB
Device
PRTCTL2
5V
Poly Fuse
USB
Device
PRTCTL4
5V
Poly Fuse
USB
Device
PRTCTL5
5V
Poly Fuse