FSA806UMX

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Two ports are designed for high-speed USB 2.0 signaling, while also capable of full speed USB and UART communication. 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. 3:1 Switch Handles: - Audio Headsets UART Up to Two High- and Low-Speed USB Data  Negative-Swing-Capable Audio Channel  Built-in Termination Resistors for Audio Pop Reduction  Simple Switch Control Using Two Select Pins The FSA806 meets both USB Rev. 2.0 and micro-USB specifications. Applications  Cell Phones, MP3 Players, PDAs Ordering Information Part Number Operating Temperature Range Top Mark Package FSA806UMX -40 to +85°C KN 12-Lead Quad, 1.8 x 1.8mm Ultrathin Molded Leadless Package (UMLP) VCC FSA806 R_HOS L_HOS DP_HOST DM_HOST R 3:1 MUX and Charge Pump DM_CO DP_HOST GN DM_HOS SEL[0 SEL[1 DP_CO Switc Contro Figure 1. Functional Block Diagram © 2010 Fairchild Semiconductor Corporation FSA806 • Rev. 1.0.1 www.fairchildsemi.com FSA806 — USB2.0 High-Speed (480Mbps), UART, and Audio Switch with Negative Signal Capability July 2012 Baseband Processor Audio Codec VCC FSA806 R_HOST mini/micro US L_HOST VBU R HS USB / FS USB HS USB / FS USB DP_HOST2 DM_HOST2 3:1 MUX and Charge Pump DP_HOST1 DM_HOST1 SEL[0] SEL[1] ID DP_CON DM_CON GND Switch Control Figure 2. Typical Application Functional Description The FSA806 USB2.0 accessory switch is designed to consolidate wired accessories for portable devices, such as cellular telephones and portable audio players. The benefits of consolidation include reduced space requirements from a reduction of connectors and their size. The micro-USB connector, for example, reduces connector height and depth, allowing for slimmer overall designs. Using the USB industry standard and a common connector type, for accessories such as chargers and headsets, greatly reduces the waste associated with new phone purchases by allowing re-use of the accessories. Applications with Multiple USB Controllers When operating with two USB controllers, it is recommended to configure the switches to OPEN before switching to the other (second) USB interface. The OPEN setting duration should be long enough for the accessory to go to a SE0 state, when the switch is set to the other (second) USB port, the new controller reenumerates. Using just five wires for all connection types considerably reduces the cost of wired accessories and simplifies their construction. The FSA806 facilitates adopting this methodology because it is designed to redirect the DP/DM pins from the USB connector to one of three ports at the baseband’s discretion. © 2010 Fairchild Semiconductor Corporation FSA806 • Rev. 1.0.1 FSA806 — USB2.0 High-Speed (480Mbps), UART, and Audio Switch with Negative Signal Capability Application Diagram www.fairchildsemi.com 2 The FSA806 select pins control the switching operations, SEL[0] and SEL[1] described in Table 1 Table 1. Selection Truth Table SEL[1] SEL[0] Switch Action 0 0 OPEN Description Open all switch paths (device in low-power mode) (1) 0 1 USB1, UART Closes USB1 path to D+/D-, default condition - DP_CON connected to DP_HOST1 - DM_CON connected to DM_HOST1 1 0 USB2, UART Closes USB2 path to D+/D- DP_CON connected to DP_HOST2 - DM_CON connected to DM_HOST2 1 1 AUDIO Closes audio path to D+/D- only - DP_CON connected to R_HOST - DM_CON connected to L_HOST Notes: 1. The SELECT pins are CMOS inputs and should not be left in a floating condition. Some applications require a UART path be in the CLOSED position on power-up for initial programming of the device under test. If that condition is desired, the two SELECT pins should be pulled to the correct levels with external resistors that should exceed 100KΩ to reduce the static power consumption. In other applications, adding weak pull-down resistors to GND defaults the device to all paths open (low-power mode). 2. When the audio switch is in the OPEN position, the R and L are terminated to GND with internal termination resistors to discharge any stray capacitance that could cause audio pop. © 2010 Fairchild Semiconductor Corporation FSA806 • Rev. 1.0.1 FSA806 — USB2.0 High-Speed (480Mbps), UART, and Audio Switch with Negative Signal Capability Mode Descriptions www.fairchildsemi.com 3 Figure 3. 12-Pin, UMLP Pin Assignments (Top-Through View) Pin Descriptions Name Pin # Description USB, UART Interface DP_HOST1 3 D+ signal, dedicated USB port to be connected to the resident USB or UART transceiver on the phone. DM_HOST1 4 D- signal, dedicated USB port to be connected to the resident USB or UART transceiver on the phone. 5 D+ signal, dedicated USB port to be connected to the resident USB or UART transceiver on the phone. 6 D- signal, dedicated USB port to be connected to the resident USB or UART transceiver on the phone. R_HOST 7 Right audio channel from phone audio codec. L_HOST 8 Left audio channel from phone audio codec. 2 Input voltage supply pin to be connected to the phone battery output. DP_HOST2 DM_HOST2 Audio Interface Power Interface VCC Connector Interface GND DP_CON DM_CON 9 Ground 11 Connected to the USB connector D+ pin; depending on the FSA806 signaling mode, this pin can share DP_HOST1, DP_HOST2 or R_HOST signals. 10 Connected to the USB connector D- pin; depending on the FSA806 signaling mode, this pin can share DM_HOST1, DM_HOST2 or L_HOST signals. FSA806 — USB2.0 High-Speed (480Mbps), UART, and Audio Switch with Negative Signal Capability Pin Configuration Switch Control SEL[1:0] 12, 1 Switch selection pins; refer to Table 1 for truth table. © 2010 Fairchild Semiconductor Corporation FSA806 • Rev. 1.0.1 www.fairchildsemi.com 4 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 VCC Parameter Supply Voltage from Battery / Baseband USB VSW Switch I/O Voltage Stereo/Mono Audio Path Active All Other Channels IIK Input Clamp Diode Current ISW Switch I/O Current (Continuous) ISWPEAK TSTG Min. Max. Unit -0.5 6.0 V -0.5 VBUS+0.5 Vcc-8.5 VCC +0.5 -0.5 VCC +0.5 -50 Peak Switch Current (Pulsed at 1ms Duration,