FSA831 Datasheet, PDF (1/3 Pages) Fairchild Semiconductor – USB2.0 High-Speed (480Mbps) Charger Detection with Isolation Switch


November 2011
FSA831 — USB2.0 High-Speed (480Mbps) Charger
Detection with Isolation Switch
Features
USB Detection
Switch Type
V_BUS
Package
Ordering
Information
USB Battery Charging Rev. 1.2
Supports Data Contact Detect (DCD)
Dead Battery Provision (DBP)
with 30-Minute Timer
Isolation Switch Closes for
Charging Downstream Port (CDP)
Standard Downstream Port (SDP)
28V Over-Voltage Tolerance
-2V Under-Voltage Tolerance
10-Lead MicroPak™
1.6 x 2.1mm, 0.5mm Pitch
FSA831L10X
Applications
 MP3, Mobile Internet Device (MID), Cell Phone, PDA,
Digital Camera, Notebook and Netbook
Typical Application
Description
The FSA831 is a charger-detection IC with an integrated
isolation switch for use with a micro/mini USB port. The
FSA831 detects battery chargers and is compliant with USB
Battery Charging Specification, Rev 1.2 (BC1.2). The
algorithm incorporates Data Contact Detection (DCD), which
ensures that the shorter, inner pins of the USB connector are
making contact prior to continuing with battery charger
detection. The device determines if a Dedicated Charging
Port (DCP), Charging Downstream Port (CDP), or a typical
PC host, called a Standard Downstream Port (SDP), is
connected. If a charger is detected, the FSA831 determines
whether the charger is a DCP or CDP. For SDP and CDP
detection, an internal isolation switch is closed to connect
the D+/D- lines of the USB cable to the resident USB
transceiver within the portable device. The FSA831
conforms to all the constraints for the Dead Battery Provision
(DBP) within the BC1.2 specification, including a 30-minute
timer that cannot exceed 45 minutes, per BC1.2.
Related Resources
 For samples and questions, please contact:
[e-mail].
System on
Chip (SoC)
USB
PHY
CHG_AL_N
GOOD_BAT
DM_HOST
DP_HOST
SW_OPEN
Li+
Charger
CHG_DET
Bat
FSA831
Regulator
and Switch
V _BUS
Control
OVT
DM_CON
DP_CON
Charger
Detect
GND
USB Port
V_{BUS_IN}
D-
D+
ID
GND
© 2011 Fairchild Semiconductor Corporation
FSA831 • Rev. 1.0.2
Figure 1. Mobile Phone Example
www.fairchildsemi.com