FSA221L10X

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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 portable peripheral devices. HS-USB: 4Ω Typical On Resistance HS-USB: 4.5pF Typical On Capacitance Audio: 3Ω Typical On Resistance -3db Bandwidth: > 720MHz Low Power Consumption Power-off Protection on Common D+/R, D-/L Ports Since USB2.0 is an industry standard for shared datapath in portable devices, the FSA221 also incorporates a Vbus detection capability. The FSA221 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. Automatically Detects Vbus for Switch Path Selection Applications   Cell Phone, PDA, Digital Camera, and Notebook LCD Monitor, TV, and Set-Top Box Ordering Information Part Number Package Number Top Mark FSA221L10X MAC10A GK FSA221MUX MUA10A FSA221 FSA221UMX UMLP10A GL Package Description 10-Lead MicroPak™, JEDEC MO-255, 1.6 x 2.1mm 10-Lead MSOP JEDEC MO-187, 3.0 mm Wide 10-Lead Quad, Ultrathin MLP, 1.4 x 1.8mm Vbus AS e l S w it c h S e l e c t C o n tr o l C ircuitry VAUDIO Rp d D+ GND D+/R R D -- D -/L L Figure 1. © 2006 Fairchild Semiconductor Corporation FSA221 • Rev. 1.1.0 Analog Symbol www.fairchildsemi.com FSA221 — USB2.0 High-Speed and Audio Switches with Negative Signal Capability March 2013 Vbus 10 D+ 1 9 ASel D+ 1 10 Vbus D-- 2 8 D+/R DR 2 9 L 3 3 8 ASel D+/R GND 4 L 4 7 D-/L Vaudio 5 5 6 Vaudio R 3 L 7 4 6 D-/L GND Vaudio R D2 1 10 D+ 6 7 D-/L D+/R 9 Vbus 8 ASel 5 GND Figure 2. 10-Lead MicroPak™ Figure 3. 10-Lead MSOP Figure 4. 10-Lead UMLP Pin Descriptions Name Description Vaudio Power supply (Audio) Vbus Power supply (USB) and auto USB switch-path select ASel Audio select to override auto USB detect when VAUDIO supply is present D+, DR, L USB data bus input sources Audio right and left input sources D+/R, D-/L USB and audio common connector ports Truth Table ASel(1) Vaudio Vbus L, R D+, D- LOW LOW OFF OFF OFF ON LOW (2) HIGH (2) HIGH LOW ON OFF LOW HIGH(2) HIGH(2) OFF ON HIGH (2) (2) ON OFF HIGH HIGH 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. HIGH - 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 FSA221 • Rev. 1.1.0 www.fairchildsemi.com 2 FSA221 — USB2.0 High-Speed and Audio Switches with Negative Signal Capability Pin Assignments The FSA221 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 high-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 highspeed 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. control, to the audio path. The ASel pin is internally terminated by a resistor to GND (typical value 3M) and requires no connection for the standard ultra-portable (cell-phone, MP3, or portable media player). In an application where the supply to the FSA221 Vbus pin is not guaranteed to be removed, a GPIO pin can be used to switch out of high-speed USB mode into audio mode, using the ASel pin. The FSA221 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. 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 Application Diagram Vbus 3.0V - 3.6V Vaudio USB 2.0 Source 5V D+/R Vbus Rpd D+ GND R D- Audio CODEC ASel Switch Select Control Circuitry D-/L USB Mini -AB Connector ID L GND Figure 5. © 2006 Fairchild Semiconductor Corporation FSA221 • Rev. 1.1.0 Typical Application www.fairchildsemi.com 3 FSA221 — USB2.0 High-Speed and Audio Switches with Negative Signal Capability Functional Description 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 Parameter D+, D-, D+/R, D-/L Pins Switch I/O Voltage(3) Unit -0.5 6.0 V VBUS -7.0 VBUS +0.3 V R, L, Pins VAUDIO -7.0 VAUDIO -0.3 V Control Input Voltage (3) Input Clamp Diode Current ISW Switch I/O Current (Continuous) TSTG Max. Supply Voltage IIK ISWPEAK Min. -0.5 6.0 V -50 Peak Switch Current (Pulsed at 1ms Duration,