FSA9280A Datasheet, PDF (1/3 Pages) Fairchild Semiconductor – USB 2.0 Accessory Detection Switch with 28V FET

March 2010
FSA9280A / FSA9288A
USB 2.0 Accessory Detection Switch with 28V FET
Features
ƒ Automatically Detects USB Accessories:
- Headsets with Microphone and/or Remote
- Headphones with/without Remote
- USB Port
- USB CDP, DCP, or Car Kit Battery Chargers
- Factory-Mode Cables
- UART Serial Link
- TTY Converter
ƒ Automatically Configures Switch Connections with
Independent Override Capability
ƒ Low-Power Mode When No Accessory Attached
ƒ Integrated 28V Over-Voltage and 1.5A Over-
Current Protection FET on VBUS for Fault Isolation
- Higher Over-Voltage (8V Typical) Option:
FSA9288A
ƒ Negative-Swing-Capable Audio Channel
ƒ Separate Logic/Power Controls for Enhanced
Factory-Mode Operation
ƒ 20-Lead Ultrathin Molded Leadless Package
(3mm x 4mm x 0.55mm)
Applications
ƒ Mobile Phones & Portable Media Players
Description
The FSA9280A/FSA9288A is a USB 2.0 port accessory
detector and switch with integrated 28V over-voltage
and 1.5A over-current protected FET. Fully controlled
using I²C™, FSA9280A/FSA9288A enables USB ports,
stereo and mono audio headphones/headsets with or
without a microphone, TTY (teletype) converters, wired
remote controller with either one button (send/end) or up
to 12 buttons, USB Charging Downstream Port (CDP),
Dedicated Charging Port (DCP) and ANSI/CEA-936-A
USB Car Kit battery chargers, and UART (Universal
Asynchronous Receiver/Transmitter) data cables to use
a common connector, micro or mini USB 2.0 port.
Factory-mode cables can be detected and switched to
use either the UART or USB data path. The
FSA9280A/FSA9288A can be programmed for manual
switching or automatic switching of data paths based on
accessory detected.
The architecture uses a simple standard resistor to
ground on the ID pin of the accessory’s micro-B or
micro-A/B connector to detect the accessories.
FSA9280A/FSA9288A has advanced modes for wired
remote control sensing for audio accessories and
streamlined detection for simple factory testing. These
devices are designed to allow audio signals to swing
below ground on the USB port data lines.
For additional performance information, please contact
[e-mail].
© 2010 Fairchild Semiconductor Corporation
FSA9280A • Rev 1.0.1
FSA9280A
Figure 1. Typical Application
www.fairchildsemi.com