FSA9480UCX
FSA9480UCX Datasheet
FSA9480 USB2.0 Accessory Switch
| Part | Datasheet |
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FSA9480UCX |
FSA9480UCX (pdf) |
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| FSA9480 USB2.0 Accessory Switch August 2010 FSA9480 USB Accessory Switch Automatically Detects USB Accessories: - USB OTG Mode - CEA-936-A Car Kit and Chargers - Headsets - Video Cable - Factory Mode Cables - UART - TTY Converter - USB Data Cable - Chargers Auto-configures Connections with Independent Override Capability Integrated Audio Amplifier Generates Required Bias for CEA-936-A Car Kit Audio Automatic Low-Power Mode When No Accessory is Attached Integrated Over-Voltage and Over Current Protection FET on VBUS for Fault Isolation Negative-Swing-Capable Audio Channel The FSA9480 is a USB port accessory detector and switch. The FSA9480 is fully controlled using I2C and enables USB data, stereo and mono audio, video, microphone, and UART data to use a common connector port. It is designed for compatibility with CEA936-A car kit adapters, USB signaling, and USB OTG on-the-go . The architecture is designed to allow audio signals to swing below ground so a common USB and headphone jack can be used for personal media players and portable peripheral devices. Applications Cell Phones Ordering Information Part Number FSA9480UCX Operating Temperature Range -40 to +85°C Top Mark N4 Package 25-Lead, 2.1x2.1x0.625mm WLCSP Package I2C is a trademark of NXP B.V. Corporation. FSA9480 USB2.0 Accessory Switch Application Diagram Figure Typical Application 2008 Fairchild Semiconductor Corporation FSA9480 USB2.0 Accessory Switch Block Descriptions This block is used for factory-mode test and debug as described in Table Boot Table Factory Mode ID Resistor BOOT Switch Connections UART, Boot Off 523KΩ LOW Table 3 - Accessory Auto Configuration Table USB, Boot On 301KΩ HIGH Table 3 - Accessory Auto Configuration Table USB, Boot Off 255KΩ LOW Table 3 - Accessory Auto Configuration Table UART, Boot On 619KΩ HIGH Table 3 - Accessory Auto Configuration Table No Factory Mode Hi-Z LOW See Notes 1 and 2 Notes JIG pin description Low signals the phone to power up. When disabled this open drain floats and the pin is Hi-Z BOOT pin description This boot pin level directs the baseband processor which mode to boot in when the JIG box is attached, the JIG pin has been driven LOW, and the phone is powered up. D+, D- Charger Detection This block monitors D+ and D- to determine when a USB charger or dedicated charger is attached to the phone. The detection scheme follows the dedicated charger-detect algorithm as defined in the USB Implementers Forum Battery Charging Working Group specification titled Battery Charging Specification and as described in the CEA-936-A USB car kit specification. The FSA9480 distinguishes between a dedicated charger and USB charger and reports the appropriate type in the Device Type 1 Register. Whenever either type of charger is detected, the CHG_DET ISET pin is pulled LOW. Chip Power Select and Voltage Regulator This block independently selects VBUS_IN or VBAT to power the FSA9480 and includes necessary LDO voltage regulators to provide stable power. Valid ranges for detecting and accepting supply for VBAT 3.0V to 4.4V VBUS 4.4V to 5.5V. Voltage reference selection criteria If VBUS is present and in the valid range, the device takes its power from VBUS. Otherwise, the device takes its power from VBAT if in valid range . If the device is operating on VBAT and a valid VBUS becomes available, the device switches to the VBUS reference. |
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