FSA9280A

FSA9280A / FSA9288A — USB2.0 Accessory Detection Switch with 28V FET March 2010 FSA9280A / FSA9288A USB 2.0 Accessory Detection Switch with 28V FET Features Automatically Detects USB Accessories: 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 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. 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 analogswitch@fairchildsemi.com. - 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 Separate Logic/Power Controls for Enhanced Factory-Mode Operation 20-Lead Ultrathin Molded Leadless Package (3mm x 4mm x 0.55mm) Applications 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 Block Diagram Phone Power Charger IC Audio Codec FS USB or UART HS USB VBAT VBUS_OUT CHG_DET MIC Audio_R Audio_L RxD TxD DP_HOST DM_HOST 3:1  MUX and Charge Pump ‐ Detection OCP,OVP FSA9280A Micro USB VBUS_IN DM_CON DP_CON ID_CON GND Charger Detect Interrupt I2C Baseband Processor INTB I2C_SCL I2C_SDA VDDIO JIG BOOT Switch Control and I2C Slave Float Detect ADC ID Detect Figure 2. Block Diagram Pin Configuration ID_CON DM_CON 18 DP_CON 20 19 17 Audio_R Audio_L MIC DP_HOST 1 VBUS_IN 16 CHG_DET VBUS_OUT I2C_SCL 2 15 3 GND Exposed DAP 14 4 13 I2C_SDA INTB VBAT DM_HOST 5 12 RxD 6 11 7 8 9 10 JIG Figure 3. Pin Assignments (Top View) © 2010 Fairchild Semiconductor Corporation FSA9280A • Rev 1.0.1 www.fairchildsemi.com 2 TxD BOOT VDDIO FSA9280A / FSA9288A — USB2.0 Accessory Detection Switch with 28V FET © 2010 Fairchild Semiconductor Corporation FSA9280A • Rev 1.0.1 www.fairchildsemi.com 3