FSA9280A / FSA9288A USB 2.0 Accessory Detection Switch with 28V FET Description Features 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 Automatically Configures Switch Connections with Independent Override Capability Low-Power Mode When No Accessory Attached Integrated 28V Over-Voltage and 1.5A OverCurrent Protection FET on VBUS for Fault Isolation - Higher Over-Voltage (8V Typical) Option: FSA9288A Negative-Swing-Capable Audio Channel 20-Lead Ultrathin Molded Leadless Package (3mm x 4mm x 0.55mm) Separate Logic/Power Controls for Enhanced Factory-Mode Operation 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 [email protected]. Applications 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 2 using I C™, 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. Mobile Phones & Portable Media Players FSA9280A Figure 1. Typical Application © 2010 Fairchild Semiconductor Corporation FSA9280A • Rev 1.0.1 www.fairchildsemi.com FSA9280A / FSA9288A — USB2.0 Accessory Detection Switch with 28V FET March 2010 VBAT Phone Power FSA9280A VBUS_OUT Charger IC CHG_DET Micro USB MIC Audio Codec Audio_R Audio_L HS USB 3:1 MUX and Charge Pump RxD TxD FS USB or UART ‐ Detection OCP,OVP DP_HOST DM_HOST VBUS_IN DM_CON DP_CON ID_CON GND Charger Detect Interrupt I2C Baseband Processor INTB I2C_SCL I2C_SDA Switch Control and I2C Slave VDDIO JIG BOOT Float Detect ADC ID Detect Figure 2. Block Diagram ID_CON DP_CON DM_CON VBUS_IN Pin Configuration 20 19 18 17 Audio_R 1 16 CHG_DET Audio_L 2 15 VBUS_OUT MIC 3 14 I2C_SCL GND FSA9280A / FSA9288A — USB2.0 Accessory Detection Switch with 28V FET Block Diagram Exposed DAP DP_HOST 4 13 I2C_SDA DM_HOST 5 12 INTB 6 11 VBAT RxD TxD BOOT 9 10 JIG 8 VDDIO 7 Figure 3. Pin Assignments (Top View) © 2010 Fairchild Semiconductor Corporation FSA9280A • Rev 1.0.1 www.fairchildsemi.com 2 FSA9280A / FSA9288A — USB2.0 Accessory Detection Switch with 28V FET © 2010 Fairchild Semiconductor Corporation FSA9280A • Rev 1.0.1 www.fairchildsemi.com 3