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FAN3988 Datenblatt(PDF) 6 Page - Fairchild Semiconductor

Teilenummer FAN3988
Bauteilbeschribung  USB/Charger and Over-Voltage Detection Device
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Hersteller  FAIRCHILD [Fairchild Semiconductor]
Direct Link  http://www.fairchildsemi.com
Logo FAIRCHILD - Fairchild Semiconductor

FAN3988 Datenblatt(HTML) 6 Page - Fairchild Semiconductor

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© 2007 Fairchild Semiconductor Corporation
www.fairchildsemi.com
FAN3988 • Rev. 1.0.10
6
Application Information
Figure 7.
Typical Application System with USB Transceiver
With USB Transceiver (Figure 7)
The FAN3988 sets the FLAG1 pin to logic HIGH or
LOW as an indicator to the system controller that a
standard USB device or a charger is connected to the
USB port. The FAN3988 also monitors the VBUS for
over- or under-voltage conditions. The FLAG2 pin is set
LOW if VBUS is less than 3.3V or greater than 6.0V.
In a standard USB configuration, there is a switch in the
USB transceiver that is always ON in the full-speed
mode. It is ON during the transition from full-speed
mode to high-speed mode and is turned off after
enumeration is complete.
In a condition where D+ and D- are shorted when a
charger is plugged into the USB port, the USB switch is
ON and pulled to VDD, which is about 3.3V, making both
D+ and D- HIGH and flag1 set HIGH – indicating that a
charging device is connected to the port.
In a condition where D+ and D- are connected to a
standard USB device, the D+ is pulled to VDD and D- is
set LOW (due to the 15KΩ pull-down in the USB
tranceiver) and flag1 is LOW.
If D+ and D- are open (floating), D+ is pulled to VDD and
D- floats LOW, which makes flag1 LOW.
Vbus
D-
Std 15K pull-down on D-
input and 1.5K pull-up
on D+ by USB
transceiver.
Control
Flag 1
Vout
D+
1.5K
GND
Vdd
Logic
Battery
Comparator
OVP
UVP
USB
Gnd
D+
D-
Vbus
Flag 2
Rsense
USB Transceiver
Logic
STD USB
Device
(ie USB
Headphones)
Std USB/
Charger
Detect
15K


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