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July 2013

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

Audio Switch with Negative Signal Capability

Features

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.

.

3:1 Switch Handles:

Audio Headsets

UART

Up to 2 High-Full and Low-Speed USB Data

Negative-Swing-Capable Audio Channel

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

specifications.

Built-in Termination Resistors for Audio Pop

Reduction

.

Simple Switch Control Using Two Select Pins

Applications

.

Cell Phones, MP3 Players, PDAs

Ordering Information

Operating

Temperature Range

Part Number

Top Mark

Package

Eco Status

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.

VCC

FSA805

R_HOST

L_HOST

R

3:1

RxD_HOST

MUX

TxD_HOST

and

DP_CON

Charge

Pump

DM_CON

DP_HOST

DM_HOST

GND

SEL[0]

Switch

SEL[1]

Control

Figure 1. Functional Block Diagram

FSA805 • Rev. 1.0.0

www.fairchildsemi.com

Application Diagram

Baseband

Processor

VCC FSA805

Micro

USB

L_HOST

Audio

Codec

R_HOST

R

3:1

MUX

and

V_BUS

TxD_HOST

RxD_HOST

UART or

HSUSB

DM_CON

Charge

Pump

DP_CON

DM_HOST

DP_HOST

ID

UART or

HSUSB

GND

SEL[0]

SEL[1]

Switch

Control

Figure 2. Typical Application

FSA805 • Rev. 1.0.0

www.fairchildsemi.com

2

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.

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.

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.

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

OPEN

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

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

- DP_CON connected to RxD_HOST

- DM_CON connected to TxD_HOST

0

1

USB, UART

AUDIO

Closes USB/UART2 path to D+/D-

- DP_CON connected to DP_HOST

- DM_CON connected to DM_HOST

1

0

1

Closes audio path to D+/D- only

- DP_CON connected to R_HOST

- DM_CON connected to L_HOST

1

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

www.fairchildsemi.com

3

Pin Configuration

12 11 10

1

9

SEL[0]

V_CC

L_HOST

R_HOST

8

2

7

3

4

5

6

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

Pin Descriptions

Name

Pin #

Description

USB Interface

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

Can also be used for UART signaling.

DP_HOST

DM_HOST

3

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

8

Right audio channel from phone audio-out codec

Left audio channel from phone audio-out codec

L_HOST

UART Interface

5

6

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

signaling.

TxD_HOST

RxD_HOST

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

signaling.

Power Interface

V_CC

2

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

Connector Interface

GND

9

Ground

11

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

D+, R, Rxd, or MIC signals

DP_CON

10

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

D-, L, or Txd signals

DM_CON

Switch Control

SEL[1:0]

1,12 Switch selection pins; refer to Table 1 for truth table

FSA805 • Rev. 1.0.0

www.fairchildsemi.com

4

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

Supply Voltage from Battery / Baseband

USB

Min.

-0.5

-1.0

-1.5

-0.5

-50

Max.

6.0

Unit

V_CC

V

_CC+0.5

V_SW

Switch I/O Voltage

Stereo/Mono Audio Path Active

V_CC+0.5

V

All Other Channels

I_IK

Input Clamp Diode Current

Switch I/O Current (Continuous)

mA

USB

50

60

I_SW

Audio

All Other Channels

USB

50

150

+150

+260

13.0

8.0

mA

Peak Switch Current (Pulsed at 1ms

Duration, <10% Duty Cycle)

Audio

I_SWPEAK

All Other Channels

T_STG

T_J

Storage Temperature Range

-65

C

Maximum Junction Temperature

T_L

Lead Temperature (Soldering, 10 Seconds)

Air Gap

Contact

All Pins

USB Connector Pins

(D+, D-)

IEC 61000-4-2 System

ESD

kV

JEDEC JESD22-A114, Human Body Model

JEDEC JESD22-C101, Charged Device Model

4.5

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.

2.7

0

Max.

4.4

Units

V_CC

Battery Supply Voltage

Switch I/O Voltage

V

USB Path Active

Audio Path Active

UART Active

3.6

V_SW

-0.8

0

0.8

V

4.4

V

T_A

Operating Temperature

-40

+85

ºC

FSA805 • Rev. 1.0.0

www.fairchildsemi.com

5

Switch Path DC Electrical Characteristics

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

T_A= -40 to +85°C

Min. Typ. Max.

Symbol

Parameter

V_CC(V)

Conditions

Unit

Host Interface Pins (SEL[1:0])

V_IH

V_IL

Input High Voltage

Input Low Voltage

3.2 to 4.4

1.3

V

0.7

Switch Off Characteristics

All Ports Except Audio Path

V_SW=0V to 4.4V,

Figure 9

I_OFF

Power Off Leakage Current

0

10

µA

USB Switch On Path

USB Analog Signal Range

3.2 to 4.4

0

3.6

9

V

V_D+/D-=0V, 0.4V, I_ON=8mA,

Figure 8

R_ONUSBHS Switch On Resistance⁽³⁾

6

Ω

Audio R/L Switch On Paths

Audio Analog Signal Range

3.2 to 4.4

-0.8

0.8

3

V

Ω

R_ONAUDAudio Switch On Resistance⁽³⁾3.2 to 4.4

V

_L/R=-0.8V, 0.8V, I_ON=30mA,

Audio R_ONFlatness⁽⁴⁾

3.2 to 4.4

0.1

1

Figure 8

R_FLAT

Internal Termination

Resistors⁽⁵⁾

R_TERM

kΩ

UART Switch On Path

Analog Signal Range

3.2 to 4.4 V_SW=0V, 4.4V, I_ON=8mA

0

V_CC

V

V_TxD/RxD=0V, 3.2V, I_ON=8mA,

R_ONUARTSwitch On Resistance⁽³⁾

Total Switch Current Consumption

3.2 to 4.4

Figure 8

25

Ω

Battery Supply Sleep Mode

Average Current

Static Current During Sleep

3.2 to 4.4

I_CCSL

10

80

15

µA

Mode (SEL[1:0]=0)

Battery Supply Active Mode

Average Current

Average Pulse Current

3.2 to 4.4

I_CCWK

110

(~100µs Pulse)

V_SEL= 2.8V and V_CC= 4.4V

3.2 to 4.4

8

µA

Increase in I_CCSL/I_CCWKCurrent

I_CCSELT

per Control Voltage and V_CC

V_SEL= 1.8V and V_CC= 4.4V

10

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

www.fairchildsemi.com

6

Switch Path AC Electrical Characteristics⁽⁶⁾

All typical value are for V_CC=3.8V at T_A=25ºC unless otherwise specified.

Symbol

Parameter

Conditions

Typical Unit Figure

Audio Mode

4

1.0nF, V_S=0V,

R_S=0Ω

Q

Charge Injection

UART Mode

USB Mode

4

6

pC Figure 13

f=20kHz, R_T=32Ω,

C_L=0pF

Audio Mode

-95

-75

Active Channel Crosstalk

DP_CON to DM_CON

UART Mode

USB Mode

f=1MHz, R_T=50Ω,

C_L=0pF

Xtalk

dB Figure 12

MIC on VBUS to

R_HOST, L_HOST

Active Channel Crosstalk

MIC

f=20kHz, R_T=32Ω,

C_L=0pF

-105

-100

MIC on DP_CON to

L_HOST (DM_CON)

Audio Path

L_HOST to DM_CON,

R_HOST to DP_CON

f=20kHz, R_T=32Ω,

C_L=0pF

USB Path

O_IRR

Off Isolation Rejection Ratio

dB Figure 11

DM_HOST to

DM_CON, DP_HOST

to DP_CON

-80

-85

f=1 MHz, R_T=50Ω,

C_L=0pF

UART Path

TxD_HOST to

DM_CON, RxD_HOST

to DP_CON

20Hz to 20kHz,

R_L=16Ω, Input

Signal Range 1.6V_PP

0.037

0.025

%

Figure 16

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

20Hz to 20kHz,

R_L=32Ω, Input

Signal Range 1.6V_PP

R_L=50ꢀ, C_L=50pF,

t_r=t_f=500ps (10-90%)

at 480Mbps

t_J

Total Jitter (USB Mode)

130

ps

(PRBS=2¹⁵–1)

R_L=50ꢀ, C_L=0pF

R_L=50ꢀ, C_L=5pF

1150

550

MHz Figure 10

BW

-3db Bandwidth (USB Mode DPHost/DMHost)

Note:

6. Guaranteed by characterization; not production tested.

www.fairchildsemi.com

FSA805 • Rev. 1.0.0

7

Capacitance

T_A= -40 to +85°C

Min. Typ. Max.

2.0

Symbol

Parameter

V_CC(V)

Conditions

Unit

Figure

C_IN

Select Pins Capacitance⁽⁷⁾

0

V_BIAS=0.2V

_BIAS=0.2V, f=1MHz

pF

Figure 14

Figure 15

D+, D- On Capacitance

(HS USB Mode)⁽⁷⁾

C_{ON(D+, D-)}

3.8

V

6.5

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

www.fairchildsemi.com

8

Test Diagrams

V_ON

I_A(OFF)

NC

A

nB

n

nA

V

IN

V

IN

Select

I_ON

GND

Select

GND

V

= 0 orV

cc

Sel

V

= 0 or V

cc

Sel

**Each switch port is tested separately.

R_ON= V_ON/ I_ON

Figure 8. On Resistance

Figure 9. Off Leakage

Network Analyzer

R

S

R

S

V

IN

V

GND

V

S

GND

S

R

T

GND

V

GND

Sel

V

OUT

V

OUT

GND

R

T

R_Sand R_Tare functions of the application

environment (see AC/DC tables).

R_Land C_Lare functions of the application

environment (see AC/DC tables).

GND

Off-Isolation = 20 Log (V_OUT/ V_IN

)

L

C_Lincludes test fixture and stray capacitance.

Figure 10. Bandwidth

Figure 11. Channel Off Isolation

Network Analyzer

NC

R

S

V

IN

V_{S1, S2, S3}

V

GND

S

GND

R

T

GND

V

OUT

R

T

GND

R_Sand R_Tare functions of the application

environment (see AC tables for values).

CROSSTALK = 20 Log (V_OUT/ V_IN

)

Figure 12. Adjacent Channel Crosstalk

FSA805 • Rev. 1.0.0

www.fairchildsemi.com

9

Test Diagrams (Continued)

Generator

B

V_CC

Input – V_SEL

V_IN

R_S

Off

On

Off

mA

V_S

0V

V_OUT

C_L

GND

nS_n

V_OUT

V_OUT

V

SEL

C_Lincludes test fixture and stray capacitance

Q = V_OUT• C

L

GND

Figure 13. Charge Injection Test

nB

n

nB

Capacitance

Meter

n

nS

n

nS

n

Capacitance

Meter

V_Sel= 0 or V_cc

V

_Sel= 0 orVcc

f = 1MHz

nB

f = 1MHz

n

nB

n

Figure 14. Channel Off Capacitance

Figure 15. Channel On Capacitance

Audio Analyzer

R

S

V

IN

V

S

GND

V_CNTRL

V

OUT

GND

R

T

V_Sel= 0 or V_cc

GND

R_Sand R_Tare functions of the application

environment (see AC Tables for specific values).

Figure 16. Total Harmonic Distortion

FSA805 • Rev. 1.0.0

www.fairchildsemi.com

10

Physical Dimensions

0.10 C

1.80

A

2.55

2X

12X

0.75

B

1

2.55

1.80

PIN #1 QUADRANT

0.40

0.10 C

12X

0.20

2X

TOP VIEW

RECOMMENDED LAND PATTERN

ALL DIMENSIONS REFERENCE

0.55 MAX.

0.10 C

0.152

C

SEATING

PLANE

0.08 C

0.05

0.00

SIDE VIEW

3

6

0.40

0.425 TYP

0.100

11X

0.45

0.35

1

0.100

12

9

0.44

0.40

0.100

0.10 C A B

0.05 C

0.22

0.18

10X

DETAIL A

PIN #1 TERMINAL

SCALE: 2X

BOTTOM VIEW

A. DIMENSIONS ARE IN MILLIMETERS.

B. DIMENSIONS AND TOLERANCES PER

ASME Y14.5M, 1994

C. LANDPATTERN PER IPC LANDPATTERN CALCULATOR V 2009.18.00

D. DRAWING FILENAME: MKT-UMLP12A REVISION2

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

www.fairchildsemi.com

11

FSA805 • Rev. 1.0.0

www.fairchildsemi.com

12

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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1


型号：	FSA805UMX
厂家：	ONSEMI
描述：	配件开关开关光电二极管
文件：	总14页 (文件大小：504K)
中文：	中文翻译
下载：	下载PDF数据表文档文件

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