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PDF FSA9280A Data sheet ( Hoja de datos )
| Número de pieza | FSA9280A | |
| Descripción | USB Port Multimedia Switch Featuring Automatic Select and Accessory Detection | |
| Fabricantes | Fairchild Semiconductor | |
| Logotipo |  |
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March 2013
FSA9280A
USB Port Multimedia Switch Featuring Automatic Select
and Accessory Detection
Features
Signals
Switch
Mechanism
Accessory
Detection
USB
USB Charging
Audio
VBAT
Programmability
ESD
Package
Ordering
Information
Audio, USB, UART, USB Charging
Automatic Switching with
Available Interrupt
Headsets (Headphone/MIC/Remote)
USB Data Port (SDP)
UART Serial Link
USB Chargers (Car-Kit, CDP, DCP)
Factory-Mode
TTY Converter
FS and HS 2.0 Compliant
Battery Charging 1.1 Compliant
(Including Optional DCD)
Integrated Power FET
Over-Voltage Tolerance (OVT) 28V
Over-Current Protection (OCP) 1.5A
Over-Voltage Protection (OVP) 6.8V
Left, Right, MIC, TTY
3 to 4.4V
I2C
15kV IEC 61000-4-2 Air Gap
20-Lead UMLP
(3 x 4 x 0.55mm, 0.5mm Pitch)
FSA9280AUMX
Description
The FSA9280A is a high-performance multimedia switch
featuring automatic switching and accessory detection for
the USB port. This switch allows sharing of a common USB
port to pass audio, USB data / charging, as well as factory
programmability. In addition, the FSA9280A integrates
detection of accessories; such as headphones, headsets
(MIC / button), car chargers, USB chargers, and UART data
cables; with the ability to use a common USB connector. The
FSA9280A can be programmed for manual or automatic
switching of data paths based on accessory detected.
FSA9280A includes an integrated 28V over-voltage and
1.5A over-current protected FET.
Applications
Mobile Phones & Portable Media Players
Related Resources
FSA9280A Evaluation Board
Evaluation Board Users Guide
For samples, questions or board requests; please
contact [email protected]
© 2009 Fairchild Semiconductor Corporation
FSA9280A • Rev 1.1.0
FSA9280A
Figure 1. Typical Application
www.fairchildsemi.com
1 page  
1. Functionality
The FSA9280A offers a complete solution for a single 5-pin
USB interface. Through built-in detection algorithms that
monitor the ID and VBUS pins of the USB interface, the
FSA9280A allows seamless sharing of the interface between
HS USB, FS USB or UART, and audio sources. The
FSA9280A also offers a complete solution for multiple types
of USB chargers. The FSA9280A detects different USB
charger types and has a dedicated charger IC interface to
allow charging through the devices and dynamic current
control by the charger IC based on the type of charger
detected. Additional over-current protection (OCP) and up to
28V over-voltage tolerance (OVT) is provided.
The detection features are capable of monitoring the ID pin of
the USB interface to detect a full array of USB accessories,
including audio accessories with up to 12 buttons.
1.1. Functional Overview
The FSA9280A is designed for minimal software
requirements for proper operation. The flow diagram below
shows the basic steps of operation and contains references
to more detailed information.
Flow Diagram
Power-up &
Reset
I2C
Configuration
Accessory
Plug-in
Detection
Processor
Communication
Switch
Configuration
Active Signals
Accessory
Detached
State
Datasheet
Section
Description
Power-up & Reset
Section 2
Applying power to the device and reset states
of the device.
I2C
Section 3
Communication with device through I2C
(which can be bypassed during power-up).
Configuration
Section 4
Configuring the device using I2C and the
internal registers (which can be bypassed
during power-up).
Detection
Section 5
How the detection of the accessory is done
including attachment and detachment.
Processor
Communication
Section 6
How the detection of the accessory is
indicated to the processor.
Switch
Configuration
Section 7 Configuration of switches based on detection.
Active Signal
Section 8 Signal performance of selected configuration
© 2009 Fairchild Semiconductor Corporation
FSA9280A • Rev 1.1.0
5
www.fairchildsemi.com
5 Page 
The following figures show the attach timing of the USB
accessories and the relationship between the INTB assertion
and the CHG_DET assertion. FSA9280A implements the
optional data contact detection (DCD) feature of the USB
Battery Charging specification. The DCD detection ensures
VBUS >4.0V
proper connection of the DP_CON and DM_CON before
starting the USB charging detection scheme. This feature
allows for shorter attach times by eliminating long wait times
to allow full contact of the DP_CON and DM_CON pins.
Charger FET Closed
INTB Asserted and
registers written
VBUS Voltage
XXXXFXLOXATXXXXXXXXXXXXXXXXXXXXXXXXXXXXXFXLOXAXT XXXXXXXXXXX
ID Resistance
VBUS_OUT
170ms
Switch State
Closed (CDP Only)
CHG_DET Pin
INTB Pin
DCD-20ms
CHG DETECTION 150ms
100ms
Figure 9. USB Dedicated Charging Port (DCP) or Charging Downstream Port (CDP) Attach Timing
VBUS >4.0V
Charger FET Closed
USB Switches Closed
VBUS_IN
XXXXFXLOXATXXXXXXXXXXXXXXXXXXXXXXXXXXXXXFXLOXAXT XXXXXXXXXXX
ID Resistance
VBUS_OUT
DCD Checking 20ms
Open
USB Switch State
Charger Detection Time 110ms
130ms
Closed
Figure 10. USB Standard Downstream Port Attach Timing
VBUS >4.0V
VBUS Voltage
XXXFLXOXATXXX
ID Resistance
VBUS_OUT
Open
Switch State
Charger FET Closed
Configured Switches Closed
ID Detection Time 200ms
CHG_DET Pin
INTB Pin
200ms
100ms
Figure 11. Car Kit Type 1 and 2 Attach Timing
© 2009 Fairchild Semiconductor Corporation
FSA9280A • Rev 1.1.0
11
www.fairchildsemi.com
11 Page | ||
| Páginas | Total 30 Páginas | |
| PDF Descargar | [ Datasheet FSA9280A.PDF ] | |
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