FSA201

Click to see this datasheet in Simplified Chinese! FSA201 ⎯ USB2.0 Full-Speed and Audio Switches with Negative Signal Capability April 2007 FSA201 — USB2.0 Full-Speed and Audio Switches with Negative Signal Capability Features 3Ω Typical ON Resistance -3db Bandwidth: > 250MHz Low Power Consumption Packaged in Pb-free 10-pin MSOP and 10-Lead MicroPak™ (1.6 x 2.1mm) Power-off Protection on Common D+/R, D-/L Ports Automatically Detects VBUS for Switch Path Selection Description The FSA201 is a Double-Pole, Double Throw (DPDT) multiplexer that combines a low-distortion audio and a USB2.0 Full-Speed (FS) switch path. This configuration enables audio and USB data to share a common connector port. The architecture is designed to allow audio signals to swing below ground. This means a common USB and headphone jack can be used for personal media players and similar portable peripheral devices. Since USB2.0 is an industry standard for shared datapath in portable devices, the FSA201 also incorporates a VBUS detection capability. The FSA201 includes a power-off feature to minimize current consumption when VBUS is not present. This power-off circuitry is available for the common D+/R, D-/L ports only. Typical applications involve switching in portables and consumer applications, such as cell phones, digital cameras, and notebooks with hubs or controllers. Applications Cell Phone, PDA, Digital Camera, and Notebook LCD Monitor, TV, and Set-Top Box Ordering Information Part Number FSA201L10X FSA201MUX Package Number Pb-Free MAC010A MUA10A Yes Yes Packing Description 10-Lead MicroPak, JEDEC MO-255, 1.6 x 2.1mm 10-Lead MSOP, JEDEC MO-187, 3.0mm Wide Vbus ASel Vaudio D+ R DL Figure 1. FSA201 Analog Symbol Switch Select Control Circuitry Rpd GND D+/R D-/L © 2006 Fairchild Semiconductor Corporation FSA201 Rev. 1.2.1 www.fairchildsemi.com FSA201 ⎯ USB2.0 Full-Speed and Audio Switches with Negative Signal Capability Pin Assignments Vbus 10 D+ DR L 1 2 3 4 5 GND 9 8 7 6 ASel D+/R D-/L Vaudio D+ DR L GND 1 2 3 4 5 10 9 8 7 6 Vbus ASel D+/R D-/L Vaudio Figure 2. MicroPak™ 10-Pin Figure 3. MSOP 10-Pin Pin Descriptions Pin # 1, 2 6 3, 4 9 10 8, 7 Name D+, DVAUDIO R, L ASEL VBUS D+/R, D-/L Description USB data bus input sources Power supply (audio) Audio right and left input sources Audio select to override auto USB detect when VAUDIO supply is present Power supply (USB) and auto USB switch-path select USB and audio common connector ports Truth Table ASEL(1) Low Low Low Low High High High High VAUDIO Low Low High (2) VBUS Low High (2) L, R OFF OFF ON OFF OFF OFF ON ON D+, DOFF ON OFF ON OFF ON OFF OFF Low High (2) Low High (2) High (2) Low Low High (2) Low High (2) High (2) Notes: 1. ASEL- Internal resistor to GND provides auto-VBUS detect if there is no external connection. Forcing ASEL HIGH when VAUDIO is present overrides the USB path even if VBUS is present. 2. H - Value is the threshold as defined to meet USB2.0 VBUS requirements and audio supply threshold in a system (see DC Tables). © 2006 Fairchild Semiconductor Corporation FSA201 Rev. 1.2.1 www.fairchildsemi.com 2 FSA201 ⎯ USB2.0 Full-Speed and Audio Switches with Negative Signal Capability Functional Description The FSA201 is a combined USB and audio switch that enables sharing the D+/D- lines of a USB connector with stereo audio CODEC outputs. The switch is optimized for full-speed USB signals and includes an automatic VBUS-detection circuit. When a USB connector, rather than a headphone, is connected to the ultra-portable device the switch is automatically configured for fullspeed USB data transfer. If no VBUS is detected, and yet VAUDIO is present, the switch is configured for the lowdistortion audio switch path. The audio switch path also handles negative signals (down to -2V), which eliminates the need for large coupling capacitors. For those applications where the VBUS is generated as a self-powered device or where VBUS is not removed, the ASEL pin provides the ability to switch, under software control, to the audio path. The ASEL pin is internally terminated by a resistor to GND (typical value 3MΩ) and requires no connection for the standard ultra-portable (cell-phone, MP3, or Portable Media Player). In an application where the supply to the FSA201 VBUS pin is not guaranteed to be removed, a GPIO pin can be used to switch out of full-speed USB mode into audio mode, using the ASEL pin. The FSA201 VBUS pin must be connected directly to VBUS or a supply > 3.8V, not an LDO regulated down to 3.6V or a Vbat-generated supply that may fall below 3.8V in normal operation (see the Application Diagram). Application Diagram Vbus 3.0V - 3.6V Vaudio FS-USB Source D+ R DAudio CODEC L D-/L ID USB Mini -AB Connector Switch Select Control Circuitry Rpd GND ASel 5V D+/R Vbus GND Figure 4. Application Diagram © 2006 Fairchild Semiconductor Corporation FSA201 Rev. 1.2.1 www.fairchildsemi.com 3 FSA201 ⎯ USB2.0 Full-Speed and Audio Switches with Negative Signal Capability Absolute Maximum Ratings Stresses exceeding the absolute maximum ratings may damage the device. The device may not function or be operable above the recommended operating conditions and stressing the parts to these levels is not recommended. In addition, extended exposure to stresses above the recommended operating conditions may affect device reliability. The absolute maximum ratings are stress ratings only. Symbol VAUDIO VBUS VSW ASEL IIK ISW ISWPEAK TSTG TJ TL Parameter Supply Voltage Supply Voltage Switch I/O Voltage(3) Control Input Voltage (3) Conditions -0.5V to 6.0V -0.5V to 6.0V R, L Pins D+, D-, D+/R, D-/L Pins (VAUDIO- 7.0V) to (VAUDIO+ 0.3V) (VBUS - 7.0V) to (VBUS+ 0.3V) -0.5V to + 6.0V - 50mA USB Audio USB Audio 50mA 250mA 100mA 500mA -65°C to +150°C +150°C +260°C I/O to GND All Other Pins 10kV 8kV 2kV Input Clamp Diode Current Switch I/O Current (Continuous) Peak Switch Current (Pulsed at 1ms Duration,