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FSA9280A
USB Port Multimedia Switch Featuring Automatic Select
and Accessory Detection
Features
Signals
Switch
Mechanism
Accessory
Detection
USB
USB Charging
Audio
VBAT
Programmability
ESD
Package
Description
Audio, USB, UART, USB Charging
Automatic Switching with
Available Interrupt
Headsets (Headphone/MIC/Remote)
USB Data Port (SDP)
UART Serial Link
USB Chargers (Car-Kit, CDP, DCP)
Factory-Mode
TTY Converter
FS and HS 2.0 Compliant
Battery Charging 1.1 Compliant
(Including Optional DCD)
Integrated Power FET
Over-Voltage Tolerance (OVT) 28V
Over-Current Protection (OCP) 1.5A
Over-Voltage Protection (OVP) 6.8V
Left, Right, MIC, TTY
3 to 4.4V
I2 C
15kV IEC 61000-4-2 Air Gap
20-Lead UMLP
(3 x 4 x 0.55mm, 0.5mm Pitch)
Ordering
Information
The FSA9280A is a high-performance multimedia switch
featuring automatic switching and accessory detection for
the USB port. This switch allows sharing of a common USB
port to pass audio, USB data / charging, as well as factory
programmability. In addition, the FSA9280A integrates
detection of accessories; such as headphones, headsets
(MIC / button), car chargers, USB chargers, and UART data
cables; with the ability to use a common USB connector. The
FSA9280A can be programmed for manual or automatic
switching of data paths based on accessory detected.
FSA9280A includes an integrated 28V over-voltage and
1.5A over-current protected FET.
Applications
Mobile Phones & Portable Media Players
Related Resources
FSA9280A Evaluation Board
Evaluation Board Users Guide
For samples, questions or board requests; please
contact analogswitch@fairchildsemi.com
FSA9280AUMX
FSA9280A
Figure 1. Typical Application
© 2009 Fairchild Semiconductor Corporation
FSA9280A • Rev 1.1.0
www.fairchildsemi.com
FSA9280A — USB Port Multimedia Switch, Featuring Automatic Select and Accessory Detection
March 2013
Features ....................................................................................................................................................................................... 1
Description ................................................................................................................................................................................... 1
Applications .................................................................................................................................................................................. 1
Related Resources ....................................................................................................................................................................... 1
Table of Contents ......................................................................................................................................................................... 2
Block Diagram .............................................................................................................................................................................. 3
Pin Configuration .......................................................................................................................................................................... 3
Pin Descriptions ........................................................................................................................................................................... 4
1. Functionality .......................................................................................................................................................................... 5
1.1. Functional Overview ................................................................................................................................................... 5
2. Power-up & Reset ................................................................................................................................................................. 6
2.1. Reset .......................................................................................................................................................................... 6
2.1.1. Hardware Reset ............................................................................................................................................... 6
2.1.2. Software Reset ................................................................................................................................................ 6
2
3. I C ......................................................................................................................................................................................... 7
4. Configuration ......................................................................................................................................................................... 8
5. Detection ............................................................................................................................................................................... 8
5.1. USB Port Detection ................................................................................................................................................... 10
5.2. Audio Accessory Detection ....................................................................................................................................... 12
5.3. OCP and OVP Detection .......................................................................................................................................... 13
6. Processor Communication .................................................................................................................................................. 13
7. Switch Configuration ........................................................................................................................................................... 13
7.1. Manual Switching ...................................................................................................................................................... 14
8. Active Signal Performance .................................................................................................................................................. 15
8.1. USB Data .................................................................................................................................................................. 15
8.2. FS USB ..................................................................................................................................................................... 15
8.3. Audio ........................................................................................................................................................................ 15
9. Electrical Specifications ...................................................................................................................................................... 16
9.1. Absolute Maximum Ratings ...................................................................................................................................... 16
9.2. Recommended Operating Conditions ....................................................................................................................... 16
9.3. Switch Path DC Electrical Characteristics................................................................................................................. 16
9.4. Capacitance .............................................................................................................................................................. 18
9.5. Switch Path AC Electrical Characteristics ................................................................................................................. 18
9.6. I2C Controller DC Characteristics.............................................................................................................................. 19
9.7. I2C AC Electrical Characteristics & Register Map ..................................................................................................... 19
9.8. Factory Modes .......................................................................................................................................................... 23
9.8.1. Factory-Mode Accessory Detection ............................................................................................................... 23
10. Reference Schematic .......................................................................................................................................................... 26
11. Layout Guidelines ............................................................................................................................................................... 27
11.1. PCB Layout Guidelines for High-Speed USB Signal Integrity .................................................................................. 27
11.2. Layout for GSM/TDMA Buzz Reduction ................................................................................................................... 27
11.3. VBUS_OUT Load Timing Requirements ........................................................................................................................ 27
11.4. Systems with Multiple USB Controllers .................................................................................................................... 28
Physical Dimensions .................................................................................................................................................................. 29
© 2009 Fairchild Semiconductor Corporation
FSA9280A • Rev 1.1.0
www.fairchildsemi.com
2
FSA9280A — USB Port Multimedia Switch, Featuring Automatic Select and Accessory Detection
Table of Contents
FSA9280A — USB Port Multimedia Switch, Featuring Automatic Select and Accessory Detection
Block Diagram
Phone
Power
VBAT
FSA9280A
VBUS_OUT
Charger IC
CHG_DET
Micro
USB
MIC
Audio
Codec
FS USB
or UART
HS USB
Audio_R
Audio_L
- Detection
OCP,OVP
3:1
MUX
and
Charge
Pump
RxD
TxD
DP_HOST
DM_HOST
VBUS_IN
DM_CON
DP_CON
ID_CON
GND
Charger
Detect
Interrupt
I2C
Baseband
Processor
INTB
I2C_SCL
I2C_SDA
Switch
Control
and
I2C
Slave
VDDIO
JIG
BOOT
Float
Detect
ADC ID
Detect
Figure 2. Block Diagram
ID_CON
DP_CON
DM_CON
VBUS_IN
Pin Configuration
20
19
18
17
Audio_R
1
16
CHG_DET
Audio_L
2
15
VBUS_OUT
MIC
3
14
I2C_SCL
GND
Exposed DAP
DP_HOST
4
13
I2C_SDA
DM_HOST
5
12
INTB
RxD
6
11
VBAT
TxD
BOOT
9
10
JIG
8
VDDIO
7
Figure 3. Pin Assignments (Top View)
© 2009 Fairchild Semiconductor Corporation
FSA9280A • Rev 1.1.0
www.fairchildsemi.com
3
Pin #
Type
Default
State
Description
DP_HOST
4
Signal Path
Open
D+ signal switch path, dedicated USB port to be connected to the resident
USB transceiver on the phone
DM_HOST
5
Signal Path
Open
D- signal switch path, dedicated USB port to be connected to the resident
USB transceiver on the phone
Name
USB Interface
Audio Interface
Audio_L
2
Signal Path
Open
Left audio channel from mobile phone audio-out CODEC
Audio_R
1
Signal Path
Open
Right audio channel from mobile phone audio-out CODEC
MIC
3
Signal Path
Open
Connected to the mobile phone audio CODEC MIC input pin
TxD
7
Signal Path
Open
Transmitter (Tx) from resident UART on the mobile phone
RxD
6
Signal Path
Open
Receiver (Rx) from resident UART on the mobile phone
UART Interface
Connector Interface
ID_CON
20
Signal Path
Open
Connected to the USB connector ID pin and used for detecting
accessories or button presses
DP_CON
19
Signal Path
Open
Connected to the USB connector D+ pin; depending on the signaling
mode, this pin can be switched to DP_HOST, Audio_R, or RxD pins
DM_CON
18
Signal Path
Open
Connected to the USB connector D- pin; depending on the signaling
mode, this pin can switched to DM_HOST, Audio_L, or TxD pins
VBUS_IN
17
Power Path
N/A
Input voltage supply pin to be connected to the VBUS pin of the USB
connector
VBAT
11
Power
N/A
Input voltage supply pin to be connected to the mobile phone battery
output or to an internal regulator on the phone
VDDIO
9
Power
N/A
Baseband processor interface I/O supply pin
GND
Exposed
Center
Pad
Ground
N/A
Ground (center ground pad of package makes electrical contact)
Power Interface
Charger Interface
VBUS_OUT
15
Power Path
N/A
Output voltage supply pin to be connected to the source voltage pin on
the charger IC
CHG_DET
16
Open-Drain
Output
Hi-Z
Open-drain active LOW output, used to signal the charger IC that a
charger has been attached
Factory Interface
JIG
10
Open-Drain
Output
Hi-Z
Output control signal driven by the FSA9280A and used by the processor
for factory test modes
BOOT
8
CMOS
Output
LOW
Output control signal driven by the FSA9280A and used by the processor
for factory test modes
I2C_SCL
14
Input
Hi-Z
I2C serial clock signal to be connected to the phone-based I2C master
I2C_SDA
13
Open-Drain
I/O
Hi-Z
I2C serial data signal to be connected to the phone-based I2C master
INTB
12
CMOS
Output
LOW
Interrupt active LOW output used to prompt the phone baseband
2
processor to read the I C register bits, indicates a change in ID_CON pin
status or accessory attach status
I2C Interface
© 2009 Fairchild Semiconductor Corporation
FSA9280A • Rev 1.1.0
www.fairchildsemi.com
4
FSA9280A — USB Port Multimedia Switch, Featuring Automatic Select and Accessory Detection
Pin Descriptions
The FSA9280A offers a complete solution for a single 5-pin
USB interface. Through built-in detection algorithms that
monitor the ID and VBUS pins of the USB interface, the
FSA9280A allows seamless sharing of the interface between
HS USB, FS USB or UART, and audio sources. The
FSA9280A also offers a complete solution for multiple types
of USB chargers. The FSA9280A detects different USB
charger types and has a dedicated charger IC interface to
allow charging through the devices and dynamic current
control by the charger IC based on the type of charger
detected. Additional over-current protection (OCP) and up to
28V over-voltage tolerance (OVT) is provided.
Flow Diagram
Power-up &
Reset
I2C
The detection features are capable of monitoring the ID pin of
the USB interface to detect a full array of USB accessories,
including audio accessories with up to 12 buttons.
1.1. Functional Overview
The FSA9280A is designed for minimal software
requirements for proper operation. The flow diagram below
shows the basic steps of operation and contains references
to more detailed information.
State
Datasheet
Section
Description
Power-up & Reset
Section 2
Applying power to the device and reset states
of the device.
I2 C
Section 3
Communication with device through I2C
(which can be bypassed during power-up).
Configuration
Section 4
Configuring the device using I2C and the
internal registers (which can be bypassed
during power-up).
Detection
Section 5
How the detection of the accessory is done
including attachment and detachment.
Processor
Communication
Section 6
How the detection of the accessory is
indicated to the processor.
Switch
Configuration
Section 7
Configuration of switches based on detection.
Active Signal
Section 8
Signal performance of selected configuration
Configuration
Accessory
Plug-in
Detection
Processor
Communication
Switch
Configuration
Active Signals
Accessory
Detached
© 2009 Fairchild Semiconductor Corporation
FSA9280A • Rev 1.1.0
www.fairchildsemi.com
5
FSA9280A — USB Port Multimedia Switch, Featuring Automatic Select and Accessory Detection
1. Functionality
The FSA9280A does not need special power sequencing for
correct operation. The main power of the device is provided
by either VBUS_IN or VBAT. If VBUS_IN is not present and VBAT is
applied, VBAT is used to power the device. VDDIO is only used
for I2C interface and interrupt processing.
Table 1 summarizes the enabled features of each power
state of the FSA9280A. The valid voltages levels for each
power supply can be found in Section 9.2.
Table 1 – Power States Summary
Valid
VBUS_IN
Valid
VBAT
Valid
VDDIO(1)
Power
State
NO
NO
NO
NO
Power Down
NO
YES(2)
NO
YES
NO
Charging
through FET
Enabled Functionality
Processor Communication
(I2C & Interrupts)
NO
NO
Detection
NO
ILLEGAL STATE
Powered from VBAT
NO
NO
YES
NO
YES
YES
Powered from VBAT
NO
YES
YES
YES
NO
NO
Powered from VBUS_IN
Yes
NO
YES
YES
YES
NO
Powered from VBAT
YES
NO
YES
Powered from VBUS_IN
YES
YES
YES
Powered from VBAT
YES
YES
YES
YES
NO
YES
YES
(2)
YES
YES
Notes:
1. VDDIO is expected to be the same supply used by the baseband I/O‟s.
2. This is not a typical state: both VBAT and VDDIO are typically provided simultaneously.
2.1. Reset
When the device is reset, all the registers are initialized to
the default values shown in Table 7 and all switch paths are
open. After reset or power up, the FSA9280A enters
Standby Mode and is ready to detect accessories sensed on
its VBUS_IN and / or ID_CON pins.
With VDDIO valid, driving both I2C_SDA and I2C_SCL
signals LOW for at least 30ms.
Note:
3. I2C controllers that implement clock stretching could
cause reset. In this case, GPIOs could be used for the
I2C interface.
2.1.1.
Hardware Reset
There are three hardware reset mechanisms:
Power-on reset caused by the initial rising edge of VBUS
or VBAT
2.1.2.
Software Reset
The device can be reset through software by writing to the
Reset bit in the Register (1BH).
The falling edge of VDDIO.
© 2009 Fairchild Semiconductor Corporation
FSA9280A • Rev 1.1.0
www.fairchildsemi.com
6
FSA9280A — USB Port Multimedia Switch, Featuring Automatic Select and Accessory Detection
2. Power-up & Reset
The FSA9280A integrates a fast-mode I2C slave controller
compliant with the I2C specification version 2.1 requirements.
The FSA9280A I2C interface runs up to 400KHz.
The slave address is shown in Table 2. Status information
and configuration occurs via the I2C interface.
Please see Section 9.7 for more information.
Table 2 – I2C Slave Address
Name
Size (Bits)
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
Slave Address
8
0
1
0
0
1
0
1
Read / Write
8bits
S
Slave
Address
Note:
8bits
WR
8bits
Register
Address K
A
A
Write
Data
Write
Data
K+1
A
A
Write
Data
K+2
A
Write
Data
K+N-1
A P
Single Byte write is initiated by Master with P immediately following first data byte.
Figure 4.
8bits
8bits
I2C Write Sequence
8bits
8bits
S Slave Address WR A Register Address K A S Slave Address RD A
Register address to Read specified
Note:
Read Data K
A Read Data K+1 A Read Data K+N-1 NA P
Single or multi byte read executed from current register location (Single Byte read is
initiated by Master with NA immediately following first data byte)
If Register is not specified Master will begin read from current register. In this case only sequence showing in Red
bracket is needed
I2C Read Sequence
Figure 5.
From Master to Slave
From Slave to Master
S
A
Start Condition
Acknowledge (SDA Low)
NA NOT Acknowledge (SDA High)
WR Write=0
RD
P
Read =1
Stop Condition
VBAT
VDDIO
SDA
30ms
SCL
30ms
Internal Reset Time
Idle Standby
Idle Standby
400µs
400µs
I2C Reset Mode Timing
Figure 6.
© 2009 Fairchild Semiconductor Corporation
FSA9280A • Rev 1.1.0
www.fairchildsemi.com
7
FSA9280A — USB Port Multimedia Switch, Featuring Automatic Select and Accessory Detection
3. I2C
FSA9280A requires minimal configuration for proper
detection and reporting. The following steps can be followed
for full configuration. In many cases, only Step 5 needs to be
implemented for proper operation.
3.
1.
5.
2.
4.
Write Control register (02h) to configure different
switching configurations and wait timing.
Write Interrupt Mask 1 and 2 registers (05h, 06h) to
mask any interrupts not required in the application.
Write Timing Set 1 (08h) register to program required
key-press timing and ADC-detection timing.
Write Timing Set 2 (09h) register to program required
Switching Wait timing and Long Key Press timing.
Write Control register (02h) to clear INT Mask bit. This
enables interrupts to the baseband.
5. Detection
The FSA9280A detection algorithms monitor both the VBUS
and ID pins of the USB interface. Based on the detection
results, multiple registers are updated and the INTB pin is
asserted to indicate to the baseband processor that an
accessory was detected and to read the registers for the
complete information.
The detection algorithm allows the application to control the
timing of the detection algorithm and the configuration of the
internal switches. The flow diagram in Figure 7 shows the
operation of the detection algorithm.
FSA9280A Standby
Mode
Accessory Plug-in
FSA9280A Detects
Accessory Type
NO
FSA9280A Writes Device
Type registers and Attach
Interrupt
Is
Accessory
detected a
USB or
Factory
Mode
YES
FSA9280A autoconf igures switch
paths
Set INTB Pin LOW (INT
MASK bit must have been
cleared by µP)
FSA9280A Writes Device
Type registers and Attach
Interrupt
NO
VDDIO
=0V ?
µP reads FSA9280A
Interrupt Registers
FSA9280A set INTB Pin
LOW (INT MASK bit must
have been cleared by µP)
YES
FSA9280A waits
Switching Wait time
µP reads FSA9280A
Interrupt Registers
NO
FSA9280A takes no
action until Wait bit is
set HIGH by
processor
NO
Detach
?
Wait
Bit = 1
?
YES
YES
FSA9280A writes
Detach Interrupt
Manual
Switch =
1?
YES
NO
FSA9280A sets INTB
Pin LOW (INT MASK
bit must have been
cleared by µP)
FSA9280A conf igures
switches according to
Manual SW 1 /2
registers
FSA9280A autoconf igures switch
paths
Detach
?
YES
FSA9280A writes
Detach Interrupt and
clears Device Type
register
FSA9280A set s
INTB Pin LOW (INT
MASK bit must have
been cleared by µP)
NO
Figure 7.
© 2009 Fairchild Semiconductor Corporation
FSA9280A • Rev 1.1.0
Detection Flow Chart
www.fairchildsemi.com
8
FSA9280A — USB Port Multimedia Switch, Featuring Automatic Select and Accessory Detection
4. Configuration
Table 3.
determine which accessory is attached. Table 3 shows the
assignment of accessories based on resistor values.
ID_CON Accessory Detection
Binary Value(4)
ID_CON Resistance to GND
Min.
Typ.
Max.
Accessory Detected(5)
00000
GND
GND
GND
DO NOT USE
00001
1.9k
2.0k
2.1k
Audio Send/End Button
00010
2.470k
2.604k
2.730k
Audio Remote S1 Button(6)
00011
3.050k
3.208k
3.370k
Audio Remote S2 Button(6)
00100
3.810k
4.014k
4.210k
Audio Remote S3 Button(6)
00101
4.58k
4.82k
5.06k
Audio Remote S4 Button(6)
00110
5.73k
6.03k
6.33k
Audio Remote S5 Button(6)
00111
7.63k
8.03k
8.43k
Audio Remote S6 Button(6)
01000
9.53k
10.03k
10.53k
Audio Remote S7 Button(6)
01001
11.43k
12.03k
12.63k
Audio Remote S8 Button(6)
01010
13.74k
14.46k
15.18k
Audio Remote S9 Button(6)
01011
16.40k
17.26k
18.12k
Audio Remote S10 Button(6)
01100
19.48k
20.50k
21.53k
Audio Remote S11 Button(6)
01101
22.87k
24.07k
25.27k
Audio Remote S12 Button(6)
01110
27.27k
28.70k
30.14k
Reserved Accessory #1
01111
32.3k
34.0k
35.7k
Reserved Accessory #2
10000
38.19k
40.20k
42.21k
Reserved Accessory #3
10001
47.41k
49.90k
52.40k
Reserved Accessory #4
10010
61.66k
64.90k
68.15k
Reserved Accessory #5
10011
76.1k
80.7k
84.1k
DO NOT USE
10100
96.9k
102.0k
107.1k
DO NOT USE
10101
115k
121k
127k
TTY Converter
10110
143k
150k
157k
UART Cable
10111
190k
200k
206k
USB: See Table 4
11000
247.3k
255k
262.7k
Factory Mode Boot OFF-USB
11001
292k
301k
310k
Factory Mode Boot ON-USB
11010
347k
365k
383k
Audio Cradle
11011
428.7k
442.0k
455.3k
USB: See Table 4
11100
507.3k
523k
538.7k
Factory Mode Boot OFF-UART
11101
600.4k
619k
637.6k
Factory Mode Boot ON-UART
750k
1000k
1050k
Audio Type 1 with Remote(8)
750k
1002k
1050k
Audio Type 1 / Only Send-End(8)
20M
Open
11110
11111
USB Mode, Dedicated Charger or Accessory Detach
Notes:
4. The binary values are reported in the binary register (07h) with each valid accessory detection.
5. The accessory type is reported in the Device Type 1 (0Bh), Device Type 2 (0Bh), Button 1 (0Ch), and Button 2 (0Dh)
registers with each valid accessory detection.
6. These resistor values are created by multiple standard resistor values in series to form the button presses on the wired
remote (see Figure 12).
7. For the ID float, ID “open” is recommended; otherwise, capacitance should be minimized.
8. Audio devices with remote and audio devices with only send/end are both reported as Audio Type 1 in the Device Type 1
register (see the Audio Accessory Detection section below). Type 1 is for passive resistor audio accessories and a future
Audio Type 2 is designated for active audio accessories.
© 2009 Fairchild Semiconductor Corporation
FSA9280A • Rev 1.1.0
www.fairchildsemi.com
9
FSA9280A — USB Port Multimedia Switch, Featuring Automatic Select and Accessory Detection
The FSA9280A monitors both VBUS_IN and ID_CON to detect
accessories. The ID_CON detection is a “resistive detection”
that detects the resistance to GND on the ID_CON pin to
INTB Asserted
BB Reads INTB
Configured Switch
Closes
FLOAT
XXXXXX
ID Resistance
BB read
and
clear
INTB Pin
200ms
Open
Switch State
10ms
wait
time
Closed
Figure 8. ID-Based Accessories, No VBUS_IN Attach Timing with Default Switching Wait Bits of 10ms
5.1. USB Port Detection
The multiple types of USB 2.0 ports that the FSA9280A can detect are summarized in Table 4. These devices are unique in
that VBUS must be present to detect these accessories.
Table 4.
ID_CON and VBUS_IN Detection for USB Devices
ID_CON Resistance to GND
ADC
Value(9)
VBUS_IN
DP_CON
DP_CON
Min.
Typ.
Max.
10111
5V
X
X
190k
200k
206k
Car Kit Type 1 Charger(11)
11011
5V
X
X
428.7k
442k
455.3k
Car Kit Type 2 Charger(11)
11111
5V
(12)
(12)
20M
Open
Open
USB Dedicated Charging Port, Travel
Adapter or Dedicated Charger (DCP)
11111
5V
(12)
(12)
20M
Open
Open
USB Charging Downstream Port (CDP)
5V
(12)
(12)
20M
Open
Open
USB Standard Downstream Port (SDP)
11111
Accessory Detected(10)
Notes:
9. The ADC values are reported in the ADC register (07h) with an each valid accessory detection.
10. The accessory type is reported in the Device Type 1 (0Bh) and Car Kit Status (0Eh) registers with an each valid
accessory detection.
11. Follows the ANSI/CEA-936-A USB Car Kit specification.
12. The FSA9280A follow the Battery Charging 1.1 specification, which uses DP_CON and DM_CON to determine what USB
accessory is attached (refer to the specification for details).
© 2009 Fairchild Semiconductor Corporation
FSA9280A • Rev 1.1.0
www.fairchildsemi.com
10
FSA9280A — USB Port Multimedia Switch, Featuring Automatic Select and Accessory Detection
Accessory
Attached
proper connection of the DP_CON and DM_CON before
starting the USB charging detection scheme. This feature
allows for shorter attach times by eliminating long wait times
to allow full contact of the DP_CON and DM_CON pins.
Charger FET Closed
INTB Asserted and
registers written
VBUS >4.0V
VBUS Voltage
XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
FLOAT
FLOAT
ID Resistance
170ms
VBUS_OUT
Switch State
Closed (CDP Only)
CHG_DET Pin
100ms
INTB Pin
DCD-20ms
CHG DETECTION 150ms
Figure 9. USB Dedicated Charging Port (DCP) or Charging Downstream Port (CDP) Attach Timing
Charger FET Closed
USB Switches Closed
VBUS >4.0V
VBUS_IN
XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
FLOAT
FLOAT
ID Resistance
VBUS_OUT
DCD Checking 20ms
Charger Detection Time 110ms
Open
USB Switch State
Closed
130ms
Figure 10.
USB Standard Downstream Port Attach Timing
Charger FET Closed
Configured Switches Closed
VBUS >4.0V
VBUS Voltage
FLOAT
XXXXXXXX
ID Resistance
VBUS_OUT
ID Detection Time 200ms
Open
Switch State
CHG_DET Pin
100ms
INTB Pin
200ms
Figure 11.
© 2009 Fairchild Semiconductor Corporation
FSA9280A • Rev 1.1.0
Car Kit Type 1 and 2 Attach Timing
www.fairchildsemi.com
11
FSA9280A — USB Port Multimedia Switch, Featuring Automatic Select and Accessory Detection
The following figures show the attach timing of the USB
accessories and the relationship between the INTB assertion
and the CHG_DET assertion. FSA9280A implements the
optional data contact detection (DCD) feature of the USB
Battery Charging specification. The DCD detection ensures
Audio accessories are detected when the ID_CON pin resistance to GND is approximately 1MΩ. Configurations for this audio
accessory shown in Figure 12 and Figure 13 .
Phone
FSA 9280A
Microphone
V BUS_IN
ID
Detect
2 k?
ID _
CON
SEND /
END
Headset with Send/End Only
1 M?
DP _
CON
Right Earpiece
Left
Earpiece
DM _
CON
Figure 12.
Audio Accessory with Just Send/End Button (1% or 5% Resistors)
Phone
FSA9280A
Microphone
VBUS_IN
Headset with Remote
ID
Detect
604Ω 604Ω
2kΩ
ID_
CON
SEND/
END
S1
S2
806Ω
S3
806Ω 1.21kΩ
2kΩ
S4
S6
S5
2kΩ
2kΩ
S7
S8
2.43kΩ
S9
2.8kΩ 3.24kΩ 3.57kΩ
S10
S11
976kΩ
S12
Hold
DP_
CON
Right Earpiece
Left
Earpiece
DM_
CON
Figure 13.
Audio Accessory with Full Wired Remote Control (1% Resistors)
The FSA9280A can detect and differentiate between regular
key presses, long key presses, and a stuck key. The
definition of the key press timing is user configurable by
t0
Key Depressed,
Timing starts
Key
tKP
tKP-t0 = Key
Press bits value
Error
Key Press
tLKP
writing the Timing Set 1 (08h) and Timing Set 2 (09h)
registers. Timing diagrams for the key press detection are
shown below in Figure 14 and Figure 15.
t0
tLKP-t0 = Long Key
tLKP
tKP-t0 = Key
Press bits value
Long Key Press
tKP
tLKP-t0 = Long Key
Press bits value
Press bits value
Key
KP Bit Set
LKP Bit Set
LKR Bit Set
µP read
and clear
µP read
and clear
INTB
INTB
µP read
and clear
Figure 14.
INTB Released
after µP read
INTB Released
after µP read
Regular Key-Press Timing Diagram
© 2009 Fairchild Semiconductor Corporation
FSA9280A • Rev 1.1.0
Figure 15.
INTB Released
after µP read
Long Key-Press Timing Diagram
www.fairchildsemi.com
12
FSA9280A — USB Port Multimedia Switch, Featuring Automatic Select and Accessory Detection
5.2. Audio Accessory Detection
With VBUS_IN greater than 6.8V, VBUS_IN is disconnected,
protecting the FSA9280A and all application circuitry from
excess voltage. This block is capable of withstanding
continuous 28V in Shutdown Mode. Upon entering
Shutdown Mode, the OVP_EN bit in the Interrupt 1 register
is set HIGH and an interrupt is sent to the baseband. The
Over-Current Protection (OCP) feature limits current through
the charger FET to ≤ 1.5A. The FSA9280A automatically
senses an over-current event, shuts down VBUSOUT, and
reports this to the baseband by asserting OCP_EN in the
Interrupt 1 register. OCP Mode is only implemented when
VBUS_IN is provided by the attached accessory. Removal of
an OVP or OCP condition triggers another interrupt sent to
the processor clearing the OCP_EN and/or the OVP_EN bits
and setting the OCP_OVP_DIS bit in the Interrupt 1 register.
VBAT
VDDIO
Standby Mode
Internal Reset
100µs
INTB Mask bit
INTB event
INTB
6. Processor Communication
TINT_MASK
Switch Wait Time
Typical communication steps between the processor and the
FSA9280A during accessory detection are:
1.
a)
2.
CHG_DET asserted LOW if USB charger detected.
b)
Power-up Interrupt Timing Diagram
VDDIO Reset
Processor reads Interrupt registers to determine which
event occurred.
a)
3.
Figure 16.
INTB asserted LOW, indicating change in accessory
detection.
Interrupt
registers read
VBAT
VDDIO
Interrupt 1 (03h): Indicates if an attach, detach, key
press, long key press, long key release, OVP / OCP
event, or OVP / OCP event recovery was detected.
Each bit can be masked by setting the corresponding
bit in the Interrupt Mask 1 (05h) register.
Standby Mode
Internal Reset
100µs
INTB Mask bit
INTB event
INTB
Interrupt 2 (04h): Indicates if a reserved
accessory, ADC change, stuck key, or stuck key
recovery was detected. Each bit can be masked
by setting the corresponding bit in the Interrupt
Mask 2 (06h) register.
TINT_MASK
Switch Wait Time
Figure 17.
Interrupt
registers read
VDDIO Reset Interrupt Timing Diagram
Processor reads Status registers to determine exact
accessory detected.
a)
Device Type 1 (0Ah): Indicates which USB, Car Kit
UART, or audio accessory was detected.
b)
Device Type 2 (0Bh): Indicates which factory mode
was detected or if a TTY cable was detected.
c)
Button 1 (0Ch & ODh): Indicates which button press
was detected with Audio Type 1 accessories.
d)
VBAT
VDDIO
INTB event
INTB event
INTB Mask bit
INTB Don‟t Care (High or Low)
Car Kit Status (0Eh): Indicates which type of car kit
charger was detected.
Figure 18.
TINT_MASK
INT Mask to INTB Interrupt Timing Diagram
6.1. Interrupts
The baseband processor recognizes interrupt signals by
observing the INTB signal, which is active LOW. Interrupts
are masked upon reset or power up via the INT Mask
register bit (bit 0 of Control register, address 02h in Table 7.
Register Map) and INTB pin defaults LOW right after this
reset or power up. After the INT Mask bit is cleared by the
baseband processor, the INTB pin is driven HIGH in
preparation for a future interrupt. When an interruptible event
© 2009 Fairchild Semiconductor Corporation
FSA9280A • Rev 1.1.0
7. Switch Configuration
FSA9280A devices have two modes of operation when
configuring the internal switches. The FSA9280A can autoconfigure the switches or the switches can be configured
manually by the processor. Typical applications can use the
Auto-Configuration Mode and do not require interaction with
the baseband to configure the switches correctly.
www.fairchildsemi.com
13
FSA9280A — USB Port Multimedia Switch, Featuring Automatic Select and Accessory Detection
occurs, INTB transitions LOW and returns HIGH when the
processor reads the Interrupt register at address 03h.
Subsequent to the initial power up or reset; if the processor
writes a “1” to INT Mask bit when the system is already
powered up, the INTB pin stays HIGH and ignores all
interrupts until the INT Mask bit is cleared. If an event
happens that would ordinarily cause an interrupt when the
INT Mask bit is set, the INTB pin is LOW for tINT_MASK after
the INT Mask bit is cleared.
5.3. OCP and OVP Detection
Auto-Configurations
FSA9280A
VBUS_OUT
Charger IC
USB:
DP_CON=DP_HOST
DM_CON=DM_HOST
VBUS_OUT=VBUS_IN
CHG_DET
Micro
USB
MIC
Audio
Codec
Audio_R
Audio_L
FS USB
or UART
RxD
TxD
HS USB
DP_HOST
DM_HOST
3:1
MUX
Charger IC
VBUS_IN
DM_CON
DP_CON
and
Charge
Pump
ID_CON
Charger
Detect
GND
FSA9280A
VBUS_OUT
Audio / Key Pad:
DP_CON=Audio_R
DM_CON=Audio_L
MIC=VBUS_IN
TTY:
DP_CON=Audio_R
MIC=VBUS_IN
- Detection
OCP,OVP
CHG_DET
Micro
USB
MIC
Audio
Codec
FS USB
or UART
HS USB
Audio_R
Audio_L
3:1
MUX
RxD
TxD
DP_HOST
DM_HOST
VBUS_IN
DM_CON
DP_CON
and
Charge
Pump
ID_CON
Charger
Detect
GND
FSA9280A
VBUS_OUT
Charger IC
- Detection
OCP,OVP
CHG_DET
Micro
USB
MIC
(13)
UART :
DP_CON=RxD
DM_CON=TxD
Audio
Codec
FS USB
or UART
HS USB
Audio_R
Audio_L
3:1
MUX
RxD
TxD
- Detection
OCP,OVP
DM_CON
DP_CON
and
Charge
Pump
DP_HOST
DM_HOST
VBUS_IN
ID_CON
Charger
Detect
GND
Note:
13. Use of FS USB on the UART path requires manual switching, as described in Section 11.4 — Systems with Multiple USB
Controllers.
7.1. Manual Switching
Manual switching is enabled by writing the following registers:
Manual Switch 1 (13h): Configures the switches for DM_CON, DP_CON, and VBUS_IN.
Manual Switch 2 (14h): Configures the CHG_DET, BOOT, and JIG pins.
© 2009 Fairchild Semiconductor Corporation
FSA9280A • Rev 1.1.0
www.fairchildsemi.com
14
FSA9280A — USB Port Multimedia Switch, Featuring Automatic Select and Accessory Detection
Table 5.
8.1. USB Data
Figure 19. Pass Through Eye Compliance Testing
Input Signal
Figure 20. USB 2.0 Eye Compliance Test Results
at Output
8.2. FS USB
Figure 21.
FS USB Eye Compliance for UART Path
8.3. Audio
Figure 22.
© 2009 Fairchild Semiconductor Corporation
FSA9280A • Rev 1.1.0
THD+N Plot for Audio Channels
www.fairchildsemi.com
15
FSA9280A — USB Port Multimedia Switch, Featuring Automatic Select and Accessory Detection
8. Active Signal Performance
9.1. 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
VBAT/VDDIO Supply Voltage from Battery / Baseband
VBUS_IN
VSW
IIK
ICHG
ISW
ISWPEAK
Supply Voltage from Micro-USB Connector
Switch I/O Voltage
Min.
Max.
Unit
-0.5
6.0
V
V
-0.5
28.0
USB
-1.0
VBUS+0.5
Stereo / Mono Audio Path Active
-1.5
VBAT+0.5
All Other Channels
-0.5
VBAT+0.5
Input Clamp Diode Current
-50
Charger Detect CHG_DET Pin Current Sink Capability
Switch I/O Current (Continuous)
mA
30
USB
50
Audio
60
All Other Channels
50
USB
150
Peak Switch Current (Pulsed at Audio
1ms Duration, 2V
0.05VDDIO
VDDIO2V
0
V
V
0.4
VDDIO70ms
NO
Exit Factory Mode
Accessory Flow
NO
ID Change?
YES
Rid=Factory
Mode or Audio
Type 1 Value
Figure 24.
© 2009 Fairchild Semiconductor Corporation
FSA9280A • Rev 1.1.0
Factory Mode Flow
www.fairchildsemi.com
24
FSA9280A — USB Port Multimedia Switch, Featuring Automatic Select and Accessory Detection
Notes:
25. The charger FET closes for factory-mode BOOT ON-UART or factory-mode BOOT OFF-UART if VBUS_IN is valid only
during the time when the cable is first plugged in or a new ID_CON resistor is detected.
26. Audio-type device configuration is entered as part of the factory-mode flow shown in Figure 24 where the ID_CON pin is
not monitored for key presses and JIG remains LOW until the factory jig box is detached from the phone. MIC is not
connected in this audio type case. Figure 24 provides the attach flow diagram for the JIG box accessory. If any of the
factory modes is first entered and JIG=LOW; then and only then, can the ID_CON resistor (1MΩ) dynamically switch to
Audio Type 1 accessory without a cable detach. For the latter case, factory-mode Audio Type 1 accessory autoconfigures the switches such that: Audio_L = DM_CON.
27. MIC is left unconnected.
28. The typical key sensing for Audio Type 1 accessories for wired remote is not active for this factory-mode test.
VBUS_OUT
ID Resistance
FLOAT
XXXXXXXX
JIG Pin
ID detection time 200ms
BB wake-up
time
VDDIO
BOOT Pin
Open
Switch State
Closed
Figure 25.
ID Resistance
FACTORY Box Attach Timing (VBUS_IN Valid)
FLOAT
XXXXXX
JIG Pin
ID detection time 200ms
BB wake- up
time
VDDIO
BOOT Pin
Open
Switch State
Closed
Figure 26.
© 2009 Fairchild Semiconductor Corporation
FSA9280A • Rev 1.1.0
FACTORY Box Attach Timing without VBUS_IN
www.fairchildsemi.com
25
FSA9280A — USB Port Multimedia Switch, Featuring Automatic Select and Accessory Detection
VBUS >4.0V
VBUS_IN
VBAT
VBUS_OUT
1µF
1µF
Battery
VBAT
PMIC
VDDIO
100k
VDDIO
VBUS_IN
1.2~
10k
1.2~
10K
TVS
VBR ≤ 32V
RON ≤ 1.4Ω
1µF
SDA
SCL
INTB
SDA
SCL
GPIO
DP_CON
1pF
TVS
D+
D+
D-
AP or DBaseband
DM_CON
1pF
TVS
ID_CON
TxD
GPIO
1pF
TVS
TxD
RxD
RxD
Optional
(leave open if not used)
1.8 ~ 3.6V
1µF
JIG
JIG_ON
2.2
2.2
Micro
USB
Connector
2.2
GND
BOOT
MIC bias
VDDIO
Audio
CODEC
MIC
Audio_R
Audio_L
Figure 27.
© 2009 Fairchild Semiconductor Corporation
FSA9280A • Rev 1.1.0
10k
CHG_DET
Optional
(leave open
if not used)
Baseband or
Charger IC
Reference Schematic
www.fairchildsemi.com
26
FSA9280A — USB Port Multimedia Switch, Featuring Automatic Select and Accessory Detection
10. Reference Schematic
11.1. PCB Layout Guidelines for High-Speed
USB Signal Integrity
1.
Place FSA9280A as close to the USB controller as
possible. Shorter traces mean less loss, less chance of
picking up stray noise, and may radiate less EMI.
a)
Keep the distance between the USB controller and
the device less than one inch (< 1in).
b)
For best results, this distance should be 250mA from the FSA9280A
VBUS_OUT pin until at least 10ms after VBUS_OUT is valid.
Failure to observe this timing requirement could result in
false OCP triggering and, in some cases, could result in the
FSA9280A staying in OCP Mode until the load is removed
and re-attached.
www.fairchildsemi.com
27
FSA9280A — USB Port Multimedia Switch, Featuring Automatic Select and Accessory Detection
11. Layout Guidelines
Many phone platforms have separate full-speed and highspeed controllers; however, the FSA9280A only has one
designated USB switch path. The FSA9280A high-speed
USB path is only designed to allow one HS USB controller to
be multiplexed on to the USB connector. To allow for
multiple USB controllers on the USB port, it may be tempting
to use one of Fairchild‟s existing USB switches to multiplex
the HS and FS controllers onto the shared HS USB switch
path of the FSA9280A, as illustrated in Figure 28. It is NOT
recommended that the USB signals be multiplexed at the
input the FSA9280A DP_Host or DM_Host pins for the
following reasons:
MAP or V/P
High Speed
USB
Standard USB switches like the FSUSB42 are also
passive and cannot improve a USB signal. They result
in a slight degradation of the HS USB signal as well.
When placed in series, as shown in Figure 28, the
cumulative effect of the two series passive USB
switches impacts the HS eye performance and could
result in failure of the HS eye mask test per the USB 2.0
specification.
When factoring in the additional routing required for the
two switches in series and the additional signal path
discontinuities introduced, the likelihood of eye
degradation is increased.
High Speed
USB
Full Speed
USB
DM_Host
TxD
FSA9280A
DM_Con
ID
Figure 29. RECOMMENDED Configuration for Systems
with High-Speed, Full-Speed, and UART
In every case where the FS USB path is not routed through
the dedicated USB path of the FSA9280A, the phone
designers must place the FSA9280A into manual mode to
configure the switch path properly. On initial attachment of a
USB accessory, the FSA9280A detects and auto-configures
for USB, resulting in the DP_Con and DM_Con pins being
connected to the DP_Host and DM_Host pins, respectively.
In this configuration, the HS USB controller is automatically
connected and no further action is needed by the baseband
to send and receive data from the HS controller. For the
application shown in Figure 29, the FSA9280A must be
changed to manual mode to enable FS USB through the
UART TxD and RxD switch paths. After initial USB detection
and attach signaled by the FSA9280A, do the following:
DM_Con
1.
Write the hex value „1A‟ to the Control register (02h)
(see Table 7. Register Map). This enables Manual
Switch Mode and the FSA9280A automatically opens all
switch paths, breaking the HS USB signal path and
forcing the USB host to re-enumerate when the FS
device is configured.
2.
To configure the FSA9280A switch paths such that the
FS device is connected through the UART switch path,
write the hex value „6Ch‟ into the Manual Switch register
(13h) >125µs later to ensure enumeration. This
connects the RxD and TxD to DP_CON and DM_CON,
respectively.
3.
When FS USB data communication is complete, disable
manual switch mode by writing „1E‟ back in to the
Control register (02h).
4.
Configure the FSUSB42 input select back to the UART
source to allow UART communication.
ID
NOT RECOMMENDED — Multiplexing
High-Speed and Full-Speed USB onto the
DP_Host, DM_Host
For the reasons outlined above, it is recommend that only
the HS USB controller be connected to the FSA9280A
DP_Host and DM_Host pins. The following solutions are
recommended for those applications that require both a HS
and FS USB controller. The FSA9280A must be used for all
of these solutions since it has the available UART switch
path. The HS USB signal is highly sensitive and should only
be routed through the specially designed HS USB signal
path of the FSA9280A. Conversely, the FS USB signal
operates at much slower data rates, which makes it much
more resilient to signal path discontinuities. FS USB only
© 2009 Fairchild Semiconductor Corporation
FSA9280A • Rev 1.1.0
Txd
RxD
Txd
GND
D-
Figure 28.
FSA9280A
DP_Con
Rxd
Rxd
Connector
D+
D+
D-
UART
DP_Con
DP_Host
Connector
GND
Vbus
FSUSB42
(DPDT
USB 2.0
Switch)
DM_HOST
FSUSB42
D+
D-
DP_HOST
D-
Vbus
Baseband
Full Speed
USB
The FSA9280A employs a passive USB switch path. It
does not buffer, amplify, or enhance the USB signal in
any way. The FSA9280A is designed to have minimal
impact on the HS USB eye performance; however, there
is some limited reduction in signal amplitude and edge
rate resulting from the inherent resistance and
capacitance of the USB switch within the FSA9280A.
D+
www.fairchildsemi.com
28
FSA9280A — USB Port Multimedia Switch, Featuring Automatic Select and Accessory Detection
operates at 12Mbps and has a full 3.6V swing, which makes
it much less sensitive to capacitive loading. Compared to HS
USB, FS USB has a large voltage swing, which makes it less
sensitive to switch on resistance. Therefore, the FS USB
signal can be alternately routed through the UART signal
path. Figure 29 provides an alternative application diagram.
11.4. Systems with Multiple USB Controllers
0.10 C
3.00
2X
A
2.80
B
1.70
PIN1
IDENT
3.80
4.00
2.70
0.60
20X
0.10 C
2X
TOP VIEW
0.55 MAX
0.30
20X
A
0.10 C
0.08 C
0.50
RECOMMENDED LAND PATTERN
(0.15)
0.05
0.00
C
SIDE VIEW
SEATING
PLANE
NOTES:
1.70
1.60
A. PACKAGE CONFORMS TO JEDEC MO-220
EXCEPT WHERE NOTED.
10
7
B. DIMENSIONS ARE IN MILLIMETERS.
6
11
C. DIMENSIONS AND TOLERANCES PER
ASME Y14.5M, 1994.
D. DRAWING FILENAME: MKT-UMLP20Arev1.
2.70
2.60
E. LAND PATTERN RECOMMENDATION IS
BASED ON FSC DESIGN ONLY
0.25 20X
0.15
16
1
PIN 1
IDENT
20
17
0.10
0.05
C A B
C
0.45 20X
0.35
0.50
BOTTOM VIEW
Figure 30.
20-Lead Ultrathin Molded Leadless Package (UMLP), 3 x 4 x 0.55mm, 0.5mm Pitch
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/.
Please visit Fairchild Semiconductor’s online packaging area for the most recent tape and reel specifications:
http://www.fairchildsemi.com/packaging/3x4UMLP20_TNR.pdf.
Part Number
Operating Temperature Range
Top Mark
Package
FSA9280AUMX
-40 to +85°C
9280A
20-Lead Ultrathin Molded Leadless
Package (UMLP), 3 x 4 x 0.55mm, 0.5 Pitch
© 2009 Fairchild Semiconductor Corporation
FSA9280A • Rev 1.1.0
www.fairchildsemi.com
29
FSA9280A — USB Port Multimedia Switch, Featuring Automatic Select and Accessory Detection
Physical Dimensions
FSA9280A — USB Port Multimedia Switch, Featuring Automatic Select and Accessory Detection
30
www.fairchildsemi.com
© 2009 Fairchild Semiconductor Corporation
FSA9280A • Rev 1.1.0
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www.onsemi.com
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