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July 2013

FSA805 • Rev. 1.0.0

FSA805 — USB2.0 High-Speed (480Mbps), UART, and Audio Switch with Negative Signal Capability

FSA805 — USB2.0 High-Speed (480Mbps), UART, and

Audio Switch with Negative Signal Capability

Features

 3:1 Switch Handles:

 Audio Headsets

 UART

 Up to 2 High-Full 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

Applications

 Cell Phones, MP3 Players, PDAs

Description

The FSA805 is a 3:1 USB accessory switch that enables

USB data, stereo/mono audio, and UART data to share

a common connector port. It is designed for high-speed

USB 2.0 signaling. The architecture is designed to allow

audio signals to swing below ground (to -0.8V) so a

common USB and headphone jack can be used for

personal media players and portable peripheral devices.

The FSA805 meets both USB Rev. 2.0 and micro-USB

specifications.

Ordering Information

Part Number Operating

Temperature Range Top Mark Eco Status Package

FSA805UMX -40 to +85°C JZ Green 12-Lead Quad, UMLP, 1.8x1.8mm

For Fairchild’s definition of Eco Status, please visit: http://www.fairchildsemi.com/company/green/rohs_green.html.

DP_CON

GND

DM_CON

DP_HOST

DM_HOST

R_HOST

L_HOST

RxD_HOST

TxD_HOST

VCC

SEL[0]

SEL[1]

FSA805

3:1

MUX

and

Charge

Pump

Switch

Control

Figure 1. Functional Block Diagram

FSA805 • Rev. 1.0.0 2

FSA805 — USB2.0 High-Speed (480Mbps), UART, and Audio Switch with Negative Signal Capability

Application Diagram

UART or

HS USB

UART or

HS USB

Audio

Codec

Baseband

Processor

VBUS

DM_CON

GND

DP_CON

DM_HOST

DP_HOST

L_HOST

R_HOST

TxD_HOST

RxD_HOST

VCC

SEL[0]

SEL[1]

FSA805

3:1

MUX

and

Charge

Pump

Switch

Control

Micro

USB

Figure 2. Typical Application

FSA805 • Rev. 1.0.0 3

FSA805 — USB2.0 High-Speed (480Mbps), UART, and Audio Switch with Negative Signal Capability

Functional Description

The FSA805 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 devices such as chargers

and headsets, greatly reduces the waste associated with

new phone purchases by allowing re-use of the devices.

Using just five wires for all connection types

considerably reduces the cost of wired accessories and

simplifies their construction. The FSA805 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.

Applications with Multiple USB Controllers

The FSA805 UART port (RxD_HOST, TxD_HOST) can

be used as a High-speed USB interface. This allows it to

operate in an application with two USB controllers (one

full speed, and the other full or high speed).

In this configuration, 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, so

when the switch is set to the other (second) USB port,

the new controller re-enumerates.

Mode Descriptions

The FSA805 has two select pins to control the switching

operations, SEL[0], and SEL[1]. Table 1 describes mode

operation.

Table 1. Selection Truth Table

SEL[1] SEL[0] Switch Action Description

0 0 OPEN Open all switch paths (device in low-power mode)(1)

0 1 USB, UART

Closes USB/UART1 path to D+/D-, default condition(2)

- DP_CON connected to RxD_HOST

- DM_CON connected to TxD_HOST

1 0 USB, UART

Closes USB/UART2 path to D+/D-

- DP_CON connected to DP_HOST

- DM_CON connected to DM_HOST

1 1 AUDIO

Closes audio path to D+/D- only

- DP_CON connected to R_HOST

- DM_CON connected to L_HOST

Notes:

1. When the audio switch is in the OPEN position (Table 1, line1), the R and L are terminated to GND with internal

termination resistors to discharge any stray capacitance that could cause audio pop.

2. The SELECT pins are CMOS inputs and should not be left in a floating condition. Some applications require the

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 100K 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).

FSA805 • Rev. 1.0.0 4

FSA805 — USB2.0 High-Speed (480Mbps), UART, and Audio Switch with Negative Signal Capability

Pin Configuration

3456

12 11 10 9

R_HOST

SEL[0]

VCC

DP_HOST

DM_HOST

SEL[1]

L_HOST

GND

DP_CON

DM_CON

RxD_HOST

TxD_HOST

Figure 3. 12-Pin, UMLP Pin Assignments (Top-Through View )

Pin Descriptions

Name Pin # Description

USB Interface

DP_HOST 3

D+ signal, dedicated USB port to be connected to the resident USB transceiver on the phone.

Can also be used for UART signaling.

DM_HOST 4

D- signal, dedicated USB port to be connected to the resident USB transceiver on the phone.

Can also be used for UART signaling.

Audio Interface

R_HOST 7 Right audio channel from phone audio-out codec

L_HOST 8 Left audio channel from phone audio-out codec

UART Interface

TxD_HOST 5 Tx connection from resident UART transceiver on the phone. Can also be used for HS USB

signaling.

RxD_HOST 6 Rx connection from resident UART transceiver on the phone. Can also be used for HS USB

signaling.

Power Interface

VCC 2 Input voltage supply pin to be connected to the phone battery output

Connector Interface

GND 9 Ground

DP_CON 11 Connected to the USB connector D+ pin; depending on the signaling mode, this pin can share

D+, R, Rxd, or MIC signals

DM_CON 10 Connected to the USB connector D- pin; depending on the signaling mode, this pin can share

D-, L, or Txd signals

Switch Control

SEL[1:0] 1,12 Switch selection pins; refer to Table 1 for truth table

FSA805 • Rev. 1.0.0 5

FSA805 — USB2.0 High-Speed (480Mbps), UART, and Audio Switch 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 Parameter Min. Max. Unit

VCC Supply Voltage from Battery / Baseband -0.5 6.0 V

VSW Switch I/O Voltage

USB -1.0 VCC +0.5

Stereo/Mono Audio Path Active -1.5 VCC +0.5

All Other Channels -0.5 VCC +0.5

IIK Input Clamp Diode Current -50 mA

ISW Switch I/O Current (Continuous)

USB 50

mA Audio 60

All Other Channels 50

ISWPEAK Peak Switch Current (Pulsed at 1ms

Duration, <10% Duty Cycle)

USB 150 mA

Audio 150 mA

All Other Channels 150 mA

TSTG Storage Temperature Range -65 +150 C

TJ Maximum Junction Temperature +150 C

TL Lead Temperature (Soldering, 10 Seconds) +260 C

ESD

IEC 61000-4-2 System USB Connector Pins

(D+, D-)

Air Gap 13.0

Contact 8.0

JEDEC JESD22-A114, Human Body Model All Pins 4.5

JEDEC JESD22-C101, Charged Device Model All Pins 1.5

Recommended Operating Conditions

The Recommended Operating Conditions table defines the conditions for actual device operation. Recommended

operating conditions are specified to ensure optimal performance to the datasheet specifications. Fairchild does not

recommend exceeding them or designing to Absolute Maximum Ratings.

Symbol Parameter Min. Max. Units

VCC Battery Supply Voltage 2.7 4.4 V

VSW Switch I/O Voltage

USB Path Active 0 3.6 V

Audio Path Active -0.8 0.8 V

UART Active 0 4.4 V

TA Operating Temperature -40 +85 ºC

FSA805 • Rev. 1.0.0 6

FSA805 — USB2.0 High-Speed (480Mbps), UART, and Audio Switch with Negative Signal Capability

Switch Path DC Electrical Characteristics

All typical values are at TA=25ºC unless otherwise specified.

Symbol Parameter VCC (V) Conditions TA = -40 to +85°C Unit

Min. Typ. Max.

Host Interface Pins (SEL[1:0])

VIH Input High Voltage 3.2 to 4.4 1.3 V

VIL Input Low Voltage 3.2 to 4.4 0.7 V

Switch Off Characteristics

IOFF Power Off Leakage Current 0

All Ports Except Audio Path

VSW=0V to 4.4V,

Figure 9

10 µA

USB Switch On Path

USB Analog Signal Range 3.2 to 4.4 0 3.6 V

RONUSB HS Switch On Resistance(3) 3.2 to 4.4 VD+/D-=0V, 0.4V, ION=8mA,

Figure 8 6 9 

Audio R/L Switch On Paths

Audio Analog Signal Range 3.2 to 4.4 -0.8 0.8 V

RONAUD Audio Switch On Resistance(3) 3.2 to 4.4 VL/R=-0.8V, 0.8V, ION=30mA,

Figure 8

3 

RFLAT Audio RON Flatness(4) 3.2 to 4.4 0.1 

RTERM Internal Termination

Resistors(5) 1 k

UART Switch On Path

Analog Signal Range 3.2 to 4.4 VSW=0V, 4.4V, ION=8mA 0 VCC V

RONUART Switch On Resistance(3) 3.2 to 4.4 VTxD/RxD=0V, 3.2V, ION=8mA,

Figure 8 25 

Total Switch Current Consumption

ICCSL Battery Supply Sleep Mode

Average Current 3.2 to 4.4 Static Current During Sleep

Mode (SEL[1:0]=0) 10 15 µA

ICCWK Battery Supply Active Mode

Average Current 3.2 to 4.4 Average Pulse Current

(~100µs Pulse) 80 110 µA

ICCSELT Increase in ICCSL/ICCWK Current

per Control Voltage and VCC 3.2 to 4.4 VSEL = 2.8V and VCC = 4.4V 8 µA

VSEL = 1.8V and VCC = 4.4V 10 µA

Notes:

3. On resistance is determined by the voltage drop between the both sides of the switch at the indicated current through

the switch.

4. Flatness is defined as the difference between the maximum and minimum values of on resistance over the

specified range of conditions.

5. Guaranteed by characterization; not production tested.

FSA805 • Rev. 1.0.0 7

FSA805 — USB2.0 High-Speed (480Mbps), UART, and Audio Switch with Negative Signal Capability

Switch Path AC Electrical Characteristics(6)

All typical value are for VCC =3.8V at TA=25ºC unless otherwise specified.

Symbol Parameter Conditions Typical Unit Figure

Q Charge Injection

Audio Mode

1.0nF, VS=0V,

RS=0

pC Figure 13

UART Mode 4

USB Mode 6

Xtalk

Active Channel Crosstalk

DP_CON to DM_CON

Audio Mode f=20kHz, RT=32,

CL=0pF -95

dB Figure 12

UART Mode f=1MHz, RT=50,

CL=0pF -75

USB Mode

Active Channel Crosstalk

MIC

MIC on VBUS to

R_HOST, L_HOST f=20kHz, RT=32,

CL=0pF -105

MIC on DP_CON to

L_HOST (DM_CON)

OIRR Off Isolation Rejection Ratio

Audio Path

L_HOST to DM_CON,

R_HOST to DP_CON

f=20kHz, RT=32,

CL=0pF -100

dB Figure 11

USB Path

DM_HOST to

DM_CON, DP_HOST

to DP_CON f=1 MHz, RT=50,

CL=0pF

-80

UART Path

TxD_HOST to

DM_CON, RxD_HOST

to DP_CON

-85

THD+N Total Harmonic Distortion + Noise (Audio Path)

20Hz to 20kHz,

RL=16, Input

Signal Range 1.6VPP

0.037 % Figure 16

20Hz to 20kHz,

RL=32, Input

Signal Range 1.6VPP

0.025 % Figure 16

tJ Total Jitter (USB Mode)

RL=50, CL=50pF,

tr=tf=500ps (10-90%)

at 480Mbps

(PRBS=215–1)

130 ps

BW -3db Bandwidth (USB Mode DPHost/DMHost) RL=50, CL=0pF 1150 MHz Figure 10

RL=50, CL=5pF 550 MHz Figure 10

Note:

6. Guaranteed by characterization; not production tested.

FSA805 • Rev. 1.0.0 8

FSA805 — USB2.0 High-Speed (480Mbps), UART, and Audio Switch with Negative Signal Capability

Capacitance

Symbol Parameter VCC (V) Conditions TA = -40 to +85°C Unit Figure

Min. Typ. Max.

CIN Select Pins Capacitance(7) 0 VBIAS=0.2V 2.0 pF Figure 14

CON(D+, D-) D+, D- On Capacitance

(HS USB Mode)(7) 3.8 VBIAS=0.2V, f=1MHz 6.5 pF Figure 15

Note:

7. Guaranteed by characterization; not production tested.

High Speed USB Eye Compliance Results for All FSA805 Signal Paths

The following figures show high-speed USB 2.0 eye diagrams for each path of the FSA805. Full compliance reports

are available upon request. Figure 4 shows the eye diagram of the high-speed USB source used for testing of the

FSA800 and FSA805 paths.

Figure 4. High-Speed Eye Diagram for Source

Used for All Testing Figure 5. USB (DP_HOST/DM_HOST) Path

High-Speed Eye Diagram

Figure 6. UART (TxD_HOST/RxD_HOST) High-Speed

Eye Diagram Figure 7. Audio Path High-Speed Eye Diagram

FSA805 • Rev. 1.0.0 9

FSA805 — USB2.0 High-Speed (480Mbps), UART, and Audio Switch with Negative Signal Capability

Test Diagrams

Select

Sel

= 0 or V

= V

GND

Select

Sel

= 0 orV

A(OFF)

GND

**Each switch port is tested separately.

Figure 8. On Resistan ce Figure 9. Off Leakag e

OUT

GND

Network Analyzer

Sel

GND

and C

are functions of the application

environment (see AC/DC tables).

includes test fixture and stray capacitance.

OUT

GND

Network Analyzer

GND

and R

are functions of the application

environment (see AC/DC tables).

Sel

GND

Off-Isolation = 20 Log (V

OUT

Figure 10. Bandwidth Figure 11. Channel Off Isolation

OUT

GND

Network Analyzer

GND

and R

are functions of the application

environment (see AC tables for values).

S1, S2, S3

GND

CROSSTALK = 20 Log (V

OUT

)

Figure 12. Adjacent Channel Crosstalk

FSA805 • Rev. 1.0.0 10

FSA805 — USB2.0 High-Speed (480Mbps), UART, and Audio Switch with Negative Signal Capability

Test Diagrams (Continued)

VOUT

Q = VOUT • CL

VOUT

VOUT

VCC

Input – VSEL

Generator

GND

SEL

VIN

nSn

GND CL includes test fixture and stray capacitance

GND

Off On Off

Figure 13. Charge Injection Test

Sel

= 0 or V

Capacitance

Meter

f=1MHz

Sel

= 0 orV

Capacitance

Meter

f=1MHz

Figure 14. Channel Off Capacitance Figure 15. Channel On Capacitan ce

OUT

GND

Audio Analyzer

CNTRL

GND

and R

are functions of the application

environment (see AC Tables for specific values).

Sel

= 0 or V

Figure 16. Total Harmonic Distortion

FSA805 • Rev. 1.0.0 11

FSA805 — USB2.0 High-Speed (480Mbps), UART, and Audio Switch with Negative Signal Capability

Physical Dimensions

A. DIMENSIONS ARE IN MILLIMETERS.

B. DIMENSIONS AND TOLERANCES PER

ASME Y14.5M, 1994

TOP VIEW

BOTTOM VIEW

RECOMMENDED LAND PATTERN

0.10 C

0.08 C

0.10 C

SIDE VIEW

SEATING

PLANE

0.10 C

0.05

0.00

0.10 CAB

0.05 C

0.55 MAX.

PIN #1 QUADRANT

1.80

0.40

0.22

0.18 10X

0.44

0.40

0.45

0.35

11X

2.55

0.40

0.75

12X

0.20

12X

0.152

0.100

0.425 TYP

0.100

DETAIL A

PIN #1 TERMINAL

SCALE: 2X

C. LANDPATTERN PER IPC LANDPATTERN CALCULATOR V 2009.18.00

D. DRAWING FILENAME: MKT-UMLP12A REVISION2

ALL DIMENSIONS REFERENCE

Figure 17. 12-Lead Quad, UMLP, 1.8x1.8mm

Package drawings are provided as a service to customers considering Fairchild components. Drawings may change in any manner

without notice. Please note the revision and/or date on the drawing and contact a Fairchild Semiconductor representative to verify or

obtain the most recent revision. Package specifications do not expand the terms of Fairchild’ s worldwide terms and conditions, specifically the

warranty therein, which covers Fairchild products.

Always visit Fairchild Semiconductor’s online packaging area for the most recent package drawings:

http://www.fairchildsemi.com/packaging/.

FSA805 • Rev. 1.0.0 12

FSA805 — USB2.0 High-Speed (480Mbps), UART, and Audio Switch with Negative Signal Capability

www.onsemi.com

ON Semiconductor and are trademarks of Semiconductor Components Industries, LLC dba ON Semiconductor or its subsidiaries in the United States and/or other countries.

ON Semiconductor owns the rights to a number of patents, trademarks, copyrights, trade secrets, and other intellectual property. A listing of ON Semiconductor’s product/patent

coverage may be accessed at www.onsemi.com/site/pdf/Patent−Marking.pdf. ON Semiconductor reserves the right to make changes without further notice to any products herein.

ON Semiconductor makes no warranty, representation or guarantee regarding the suitability of its products for any particular purpose, nor does ON Semiconductor assume any liability

arising out of the application or use of any product or circuit, and specifically disclaims any and all liability, including without limitation special, consequential or incidental damages.

Buyer is responsible for its products and applications using ON Semiconductor products, including compliance with all laws, regulations and safety requirements or standards,

regardless of any support or applications information provided by ON Semiconductor. “Typical” parameters which may be provided in ON Semiconductor data sheets and/or

specifications can and do vary in different applications and actual performance may vary over time. All operating parameters, including “Typicals” must be validated for each customer

application by customer’s technical experts. ON Semiconductor does not convey any license under its patent rights nor the rights of others. ON Semiconductor products are not

designed, intended, or authorized for use as a critical component in life support systems or any FDA Class 3 medical devices or medical devices with a same or similar classification

in a foreign jurisdiction or any devices intended for implantation in the human body. Should Buyer purchase or use ON Semiconductor products for any such unintended or unauthorized

application, Buyer shall indemnify and hold ON Semiconductor and its officers, employees, subsidiaries, affiliates, and distributors harmless against all claims, costs, damages, and

expenses, and reasonable attorney fees arising out of, directly or indirectly, any claim of personal injury or death associated with such unintended or unauthorized use, even if such

claim alleges that ON Semiconductor was negligent regarding the design or manufacture of the part. ON Semiconductor is an Equal Opportunity/Affirmative Action Employer. This

literature is subject to all applicable copyright laws and is not for resale in any manner.

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