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USB2642 데이터시트(PDF) 13 Page - Microchip Technology

부품명 USB2642
상세설명  USB 2.0 Hub and Flash Media Card Controller Combo
PDF  56 Pages
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제조업체  MICROCHIP [Microchip Technology]
홈페이지  http://www.microchip.com
Logo MICROCHIP - Microchip Technology

USB2642 데이터시트(HTML) 13 Page - Microchip Technology

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 2014-2015 Microchip Technology Inc.
DS00001578C-page 13
USB2642
5.3.2
PORT POWER CONTROL USING A POLY FUSE
When using the USB2642 with a poly fuse, an external diode must be used (see Figure 5-2). When disabling port power,
the USB2642 driver will drive a 0. This procedure will have no effect since the external diode will isolate the pin from the
load. When port power is enabled, the USB2642 output driver is disabled, and the pull-up resistor is enabled which cre-
ates an open drain output. This means that the pull-up resistor is providing 3.3 volts to the anode of the diode. If there
is an over-current situation, the poly fuse will open. This will cause the cathode of the diode to go to zero volts. The
anode of the diode will be at 0.7 volts, and the Schmitt trigger input will register this as a low resulting in an over-current
detection. The open drain output does not interfere.
FIGURE 5-1:
PORT POWER CONTROL WITH USB POWER SWITCH
USB2642
USB Power
Switch
5 V
USB
Device
PRTCTL3
EN
OCS
USB Power
Switch
5 V
USB
Device
PRTCTL2
EN
OCS



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