Motor de Búsqueda de Datasheet de Componentes Electrónicos
Selected language     Spanish  ▼

Delete All
ON OFF
ALLDATASHEET.ES

X  

Preview PDF Download HTML

FAN3988 Datasheet(PDF) 7 Page - Fairchild Semiconductor

No. de Pieza. FAN3988
Descripción  USB/Charger and Over-Voltage Detection Device
Descarga  9 Pages
Scroll/Zoom Zoom In 100% Zoom Out
Fabricante  FAIRCHILD [Fairchild Semiconductor]
Página de inicio  http://www.fairchildsemi.com
Logo 

FAN3988 Datasheet(HTML) 7 Page - Fairchild Semiconductor

   
Zoom Inzoom in Zoom Outzoom out
 7 / 9 page
background image
© 2007 Fairchild Semiconductor Corporation
www.fairchildsemi.com
FAN3988 • Rev. 1.0.5
7
Without USB Transceiver (Figure 8)
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 condition where a USB transceiver is not
incorporated or there is a switch between the USB port
and the FAN3988, external resistors must be used to
set the correct input logic states on the FAN3988 D+ D-
inputs. A 5MΩ pull-down on the D- line and a 1MΩ pull-
up to VDD (system supply) on the D+ line are
recommended.
When a condition exists where a charger is plugged into
the USB port (D+ D- shorted), the voltage divider of 1M
and 5M puts a voltage of 2.75V on the D+ D- inputs and
flag1 is HIGH, indicating a charger is connected to port.
In a condition where the USB port is connected to a
standard USB device, the D+ input is pulled up to VDD
(system supply) in parallel with the 1.5KΩ on a USB
transceiver with a parallel R value of 1.497KΩ. The D-
input is connected to a 15KΩ pull-down by the USB
device and in parallel with 5MΩ with a parallel R value
of 14.955KΩ. This condition makes flag1 LOW.
If D+ and D- are open (floating), D+ is pulled to VDD
(system supply) and D- floats LOW, which makes
flag1 LOW.
Figure 8.
Typical System Application without USB Transceiver
Flag 2
5M
Rsense
D-
Vbus
GND
Flag 1
Std USB/
Charger
Detect
1M
USB
Gnd
D+
D-
Vbus
D+
Control
Battery
Logic
Logic
Comparator
OVP
UVP
Vdd


Html Pages

1  2  3  4  5  6  7  8  9 


Datasheet Download




Enlace URL




Privacy Policy
ALLDATASHEET.ES
Does ALLDATASHEET help your business so far?  [ DONATE ]  

Todo acerca de Alldatasheet   |   Publicidad   |   Contáctenos   |   Política de Privacidad   |   Favorito   |   Intercambio de Enlaces   |   Lista de Fabricantes
All Rights Reserved© Alldatasheet.com


Mirror Sites
English : Alldatasheet.com  |   English : Alldatasheet.net  |   Chinese : Alldatasheetcn.com  |   German : Alldatasheetde.com  |   Japanese : Alldatasheet.jp
Russian : Alldatasheetru.com  |   Korean : Alldatasheet.co.kr  |   Spanish : Alldatasheet.es  |   French : Alldatasheet.fr  |   Italian : Alldatasheetit.com
Portuguese : Alldatasheetpt.com  |   Polish : Alldatasheet.pl  |   Vietnamese : Alldatasheet.vn