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USB2640I Datasheet(PDF) 19 Page - Microchip Technology

Part # USB2640I
Description  Industrial Temperature USB 2.0 Flash Media Controller and USB Hub Combo
PDF  59 Pages
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Manufacturer  MICROCHIP [Microchip Technology]
Direct Link  http://www.microchip.com
Logo MICROCHIP - Microchip Technology

USB2640I Datasheet(HTML) 19 Page - Microchip Technology

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 2015-2021 Microchip Technology Inc.
DS00001948C-page 19
USB2640i/USB2641i
6.3.2
PORT POWER CONTROL USING A POLY FUSE
When using the USB2640i/USB2641i with a poly fuse, an external diode must be used (See Figure 6-2). When disabling
port power, the USB2640i/USB2641i will drive a '0'. This procedure will have no effect since the external diode will iso-
late the pin from the load. When port power is enabled, the USB2640i/USB2641i output driver is disabled, and the pull-
up resistor is enabled which creates an open drain output. The open drain output condition means that the pull-up resis-
tor is providing 3.3 volts to the anode of the diode. If there is an over-current situation, the poly fuse will open causing
the cathode of the diode to go to 0 volts. The anode of the diode will be at 0.7 volt, 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 6-1:
PORT POWER CONTROL WITH USB POWER SWITCH
USB2640i/
USB2641i
USB Power
Switch
5V
USB
Device
PRTCTL3
EN
OCS
USB Power
Switch
5V
USB
Device
PRTCTL2
EN
OCS



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