FSA9280A 查看數據表（PDF） - Fairchild Semiconductor

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FSA9280A

USB Port Multimedia Switch Featuring Automatic Select and Accessory Detection

Fairchild Semiconductor 

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

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