Texas Instruments | Support Selfie Sticks Using a TS3A227E Audio Jack Switch | Application notes | Texas Instruments Support Selfie Sticks Using a TS3A227E Audio Jack Switch Application notes

Texas Instruments Support Selfie Sticks Using a TS3A227E Audio Jack Switch Application notes
Application Report
SCDA014 – March 2016
Detecting Selfie Sticks Using TI Audio Jack Switches
TS3A227E and TS3A225E
Jamie Zhang, Adam Torma
ABSTRACT
Selfie sticks are becoming as common of a smart phone accessory as a pair of headphones. Because of
the selfie stick’s increasing popularity, smart phone manufacturers need to be able to accommodate the
accessory. This report describes the procedure required for a smart phone to detect when a selfie stick
accessory is inserted into a smart phone's audio jack receptacle using TI audio jack switches TS3A227E
and TS3A225E. It shows how these devices respond to common selfie-stick implementations and how to
adjust the audio jack switch’s register settings to accommodate both traditional audio accessories as well
as the new selfie stick accessory.
Contents
1
Selfie Stick Schematic Overview .......................................................................................... 2
2
TS3A227E and TS3A225E Selfie Stick and Accessory Detection Overview ........................................ 3
3
How to Support a Selfie Stick Using TI’s Audio Jack Switches........................................................ 5
4
Conclusion .................................................................................................................. 10
Appendix A
....................................................................................................................... 11
List of Figures
1
Typical Selfie Stick Schematic ............................................................................................. 2
2
TS3A227E Application Circuit With Closed Circuit From Ring2 To Tip Made With Headphone Accessory..... 3
3
TS3A227E Application Circuit With Open Circuit From Ring2 To Tip Schematic With Selfie Stick Inserted .... 3
4
TS3A227E Switch State After Manually Configuring Internal Switch Network to Support Selfie Stick ........... 4
5
TS3A227E Switch State After Detecting a 4-Pole OMTP Headset ................................................... 4
6
Selfie Stick Usage Logic Flow
7
TS3A227E Switch State After Detecting a 3-Pole Headphone ........................................................ 6
8
TS3A227E Switch State After Manually Configuring Internal Switch Network to Support Selfie Stick ........... 7
9
Microphone Bias is High With Selfie Stick Inserted Into the Audio Jack Receptacle ............................... 8
10
Microphone Bias is Low With 3-pole Headphones Inserted Into the Audio Jack Receptacle ..................... 8
11
Typical Application Schematic With Headphone Accessory.......................................................... 12
12
TS3A227E Default Switch State With no Accessory Inserted
13
TS3A227E Switch State During Detection .............................................................................. 13
14
TS3A227E Switch State After Detecting a 3-Pole Headphone
15
TS3A227E Switch State After Detecting a 4-Pole OMTP Headset .................................................. 14
.............................................................................................
.......................................................
......................................................
5
12
13
List of Tables
1
Audio Jack Plug Configurations .......................................................................................... 11
Bluetooth is a registered trademark of Bluetooth SIG, Inc..
All other trademarks are the property of their respective owners.
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1
Selfie Stick Schematic Overview
1
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Selfie Stick Schematic Overview
Smart phones must know when a user presses a button on the selfie stick to take a picture. The early
selfie stick implementation for communicating this button press was using the Bluetooth® capability of the
smart phone. This was a functional solution but it required the selfie stick to include the necessary
hardware to communicate through Bluetooth as well as include a rechargeable battery. Selfie stick
manufacturers have implemented a simpler solution leveraging the smart phone’s audio jack.
The selfie stick communicates a button press to take a picture in a similar way a headphone accessory
communicates a button press to adjust the volume. The selfie stick implements this button press by
placing a mechanical switch between the mic and ground lines of the audio jack. When the user presses
the selfie stick button to take a picture, the smart phone must recognize the change in resistance between
Ring 2 and Sleeve of a 4-pole audio jack plug.
Selfie Stick Button
Selfie Stick
L
R
G
M
To Smart Phone
Figure 1. Typical Selfie Stick Schematic
2
Detecting Selfie Sticks Using TI Audio Jack Switches TS3A227E and
TS3A225E
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TS3A227E and TS3A225E Selfie Stick and Accessory Detection Overview
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2
TS3A227E and TS3A225E Selfie Stick and Accessory Detection Overview
TI’s audio jack switches require a closed path between the Tip and Ring2 and the Tip and Sleeve to
accurately detect accessories. Selfie stick’s schematics do not create a closed circuit from the Tip to
Ring2 or Sleeve like a pair of headphones which causes the TI audio jack switches to incorrectly identify a
selfie stick accessory.
Headphones
Selfie Stick Button
Left Speaker
To
CODEC
Right Speaker
To
CODEC
Microphone
14
14
TIP
TIP
7
7
RING2_SENSE
RING2_SENSE
8
L
R
G
M
8
SLEEVE_SENSE
L
R
G
M
SLEEVE_SENSE
12
12
RING2
RING2
10
10
SLEEVE
SLEEVE
TS3A227ERVAR
TS3A227ERVAR
Figure 2. TS3A227E Application Circuit With Closed
Circuit From Ring2 To Tip Made With Headphone
Accessory
Figure 3. TS3A227E Application Circuit With Open
Circuit From Ring2 To Tip Schematic With Selfie Stick
Inserted
Figure 3 shows that a selfie stick does not create closed circuit from the Tip to Ring2 or from to Tip to
Sleeve when inserted into the audio jack receptical. Since there is no closed path from the Ring2/Sleeve
pin to the Tip pin, TI’s audio jack switches will detect the selfie stick as a 3-pole device instead of a 4-pole
device. The audio jack switch then automatically configures the internal switch network to support a 3-pole
device which will not support a selfie stick.Figure 4 shows that the TS3A227E 3-pole configuration shorts
out the selfie stick button so the smart phone cannot detect the resistance change when a user presses
the selfie stick button.
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TS3A227E and TS3A225E Selfie Stick and Accessory Detection Overview
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Selfie Stick Button
TS3A227E
S3PR
RING2_SENSE
MICP
S3PS
S3GS
SLEEVE_SENSE
GND_SENSE
L
R
G
M
S3GR
RING2
SLEEVE
S1
S2
RING2
GNDFET
GND
SLEEVE
GNDFET
RING2
DFET
GNDA
SLEEVE
DFET
GND
Figure 4. TS3A227E Switch State After Manually Configuring Internal Switch Network to Support Selfie
Stick
The internal audio jack switch network must be configured to support a 4-pole device in order for the
smart phone to be able to detect the change in resistance from a user pressing the selfie stick button.
Figure 5 shows that with the switch network configured to support a 4-pole device, thecircuit allows a
smart phone to detect a change in resistance when a selfie stick button is pressed.
Selfie Stick Button
TS3A227E
S3PR
RING2_SENSE
MICP
S3PS
S3GS
SLEEVE_SENSE
GND_SENSE
L
R
G
M
S3GR
RING2
SLEEVE
S1
S2
GND
RING2
GNDFET
SLEEVE
GNDFET
RING2
DFET
GNDA
SLEEVE
DFET
GND
Figure 5. TS3A227E Switch State After Detecting a 4-Pole OMTP Headset
4
Detecting Selfie Sticks Using TI Audio Jack Switches TS3A227E and
TS3A225E
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3
How to Support a Selfie Stick Using TI’s Audio Jack Switches
3.1
Selfie Stick Detection and Configuration Flow
Both the TS3A227E and TS3A225E audio jack switches can support selfie sticks because they have an
additional feature to allow manual switch control using an I2C interface. The manual switch control is
required to reset the internal switch network to support the 4-pole selfie stick circuit after the audio jack
switch automatically detects and configures itself to support a 3-pole configuration.
Figure 6 shows the logic flow of when to manually control the TS3A227E or TS3A225E internal switch
network to correctly support a selfie stick. See Section 3.3.3 for example pseudo-code of this operation.
4 Pole
(Standard)
3 Pole
(Standard)
4 Pole
(OMTP)
Selfie Stick
TS3A225E/ TS3A227E Auto Detection
4 Pole
(Standard)
3 Pole
(Standard)
4 Pole
(OMTP)
Manual Mode Sets to
4 Pole (Standard)
3 Pole
(Standard)
Yes
Mic Voltage Low
by Codec?
No
Selfie Stick
Manual Mode Sets to
3 Pole (Standard)
Figure 6. Selfie Stick Usage Logic Flow
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How to Support a Selfie Stick Using TI’s Audio Jack Switches
3.2
www.ti.com
Manually Switching Audio Jack Switches
Manual switching of the TS3A227E and TS3A225E audio jack switches is accomplished by writing I2C
commands to the switch control registers. For more information on reading and writing I2C commands,
see I2C communication application report (SLVA704).
To manually control the internal switch network of the TS3A227E or TS3A225E, refer to the manual switch
control procedures in the datasheets.
After the TS3A227E has completed the auto-detection and results in a 3-pole configuration, the switch
control registers and switch status registers read as shown in the following table:
Addr
(xxh)
Name
Type
Reset
07h
Switch
Control 1
R/W
00h
08h
Switch
Control 2
R/W
00h
09h
Switch
Status 1
R
0Ch
0Ah
Switch
Status 2
R
00h
TS3 A227E
Bit7
Bit6
Reserved
Bit5
Bit4
Bit3
Bit2
Bit1
Bit0
SLEEVE
GNDFET
(1)
RING2
GNDFET
(1)
SLEEVE
DFET (1)
RING2
DFET (1)
Switch 2
(0)
Switch 1
(0)
S3PS (0)
S3PR (0)
S3GS (1)
S3GR (1)
SLEEVE
DFET (1)
RING2
DFET (1)
Switch 2
(0)
Switch 1
(0)
S3PS (0)
S3PR (0)
S3GS (1)
S3GR (1)
Reserved
Reserved
SLEEVE
GNDFET
(1)
RING2
GNDFET
(1)
Reserved
S3 PR
RING 2_SENSE
MICP
S 3PS
Audio Jack
S3GS
SLEEVE _SENSE
GND_SENSE
L
R
G
S3GR
RING2
SLEEVE
S1
S2
RING2
GNDFET
GND
SLEEVE
GNDFET
RING2
DFET
GNDA
SLEEVE
DFET
GND
Figure 7. TS3A227E Switch State After Detecting a 3-Pole Headphone
Manually switch the TS3A227E audio jack switch from a 3-pole configuration to a 4-pole configuration by
setting the switch control 1 and 2 registers to the desired configuration.
6
Addr
(xxh)
Name
Type
Reset
07h
Switch
Control 1
R/W
00h
08h
Switch
Control 2
R/W
00h
09h
Switch
Status 1
R
0Ch
0Ah
Switch
Status 2
R
00h
Bit7
Bit6
Reserved
Bit5
Bit4
Bit3
Bit2
Bit1
Bit0
SLEEVE
GNDFET
(0)
RING2
GNDFET
(1)
SLEEVE
DFET (0)
RING2
DFET (1)
Switch 2
(0)
Switch 1
(0)
S3PS (1)
S3PR (0)
S3GS (0)
S3GR (1)
SLEEVE
DFET (0)
RING2
DFET (1)
Switch 2
(0)
Switch 1
(0)
S3PS (1)
S3PR (0)
S3GS (0)
S3GR (1)
Reserved
Reserved
SLEEVE
GNDFET
(0)
RING2
GNDFET
(1)
Reserved
Detecting Selfie Sticks Using TI Audio Jack Switches TS3A227E and
TS3A225E
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Selfie Stick Button
TS3A227E
S3PR
RING2_SENSE
MICP
S3PS
S3GS
SLEEVE_SENSE
GND_SENSE
L
R
G
M
S3GR
RING2
SLEEVE
S1
S2
GND
RING2
GNDFET
SLEEVE
GNDFET
RING2
DFET
GNDA
SLEEVE
DFET
GND
Figure 8. TS3A227E Switch State After Manually Configuring Internal Switch Network to Support Selfie
Stick
3.3
3.3.1
Microphone Bias Voltage Detection
Why do I Need to Detect the Microphone Bias Voltage?
After the audio jack switch is manually switched from a 3-pole to a 4-pole configuration, the microphone
bias voltage must be detected to know if a selfie stick has been inserted into the audio jack or a standard
3-pole audio accessory. The microphone bias voltage can be detected in two different ways. One way is to
use the smart phone codec to detect the voltage level of the microphone bias voltage. The other way is to
use the key press detection feature of the TS3A227E.
If there is a selfie stick inserted into the audio jack receptacle, the mic bias voltage is high and no further
manual manipulation of the internal switch network is needed.
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How to Support a Selfie Stick Using TI’s Audio Jack Switches
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2.3 V
Selfie Stick Button
TS3A227E
To
CODEC
S3PR
RING2_SENSE
MICP
S3PS
S3GS
SLEEVE_SENSE
GND_SENSE
L
R
G
M
S3GR
RING2
SLEEVE
S1
S2
RING2
GNDFET
GND
SLEEVE
GNDFET
RING2
DFET
GNDA
SLEEVE
DFET
GND
Figure 9. Microphone Bias is High With Selfie Stick Inserted Into the Audio Jack Receptacle
If there is a 3-pole audio accessory inserted into the audio jack receptacle, the mic bias is pulled low by
the RING2 GNDFET and RING2 DFET because of the manual configuration of the TS3A227E switch
network to support a 4-pole device.
2.3 V
Headphones
Left Speaker
TS3A227E
To
CODEC
Right Speaker
S3PR
RING2_SENSE
MICP
S3PS
Audio Jack
S3GS
SLEEVE_SENSE
GND_SENSE
L
R
G
S3GR
RING2
SLEEVE
S1
S2
GND
RING2
GNDFET
SLEEVE
GNDFET
RING2
DFET
GNDA
SLEEVE
DFET
GND
Figure 10. Microphone Bias is Low With 3-pole Headphones Inserted Into the Audio Jack Receptacle
8
Detecting Selfie Sticks Using TI Audio Jack Switches TS3A227E and
TS3A225E
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3.3.2
How to Support a Selfie Stick Using TI’s Audio Jack Switches
What if my Audio Codec Cannot Determine the Microphone Bias Level?
Many codecs have the ability to detect the microphone bias voltage level to determine if it is high or low. If
your system codec does not have that capability, turn on the Key Press Detection of the TS3A227E to
determine if the microphone bias voltage is high or low. The TS3A227E key press detection feature can
measure the voltage on SLEEVE/RING2 that is created by the divider network between the microphone
bias output of the codec and the system ground. See the TS3A227E datasheet (SCDS358) for more
information on using the TS3A227E key press detection feature.
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Conclusion
3.3.3
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Example Pseduo Code using the TS3A227E
registerValue = readRegister(0x01);
if (registerValue & 0x01) { // Bitwise AND for bit 0 (Ins/Rem Event) in Interrupt Register is set to 1
registerValue = readRegister(0x0B); // After an Ins/Rem Event read the Accessory Status register
if (registerValue & 0x01) { // Bitwise AND for bit 0 (3-pole) in Accessory Status Register is set to 1
// If Accessory Status is 3-pole, manually switch the device into a 4-pole configuration
writeDataToRegister(0x14, 0x07); // Write 0x14 to register 0x07 (Switch Control 1)
writeDataToRegister(0x03, 0x08); // Write 0x03 to register 0x08 (Switch Control 2)
registerValue = readRegister(0x02); // Reading the Key Press Interrupt register to determine if the mic bias voltage is
pulled low because a 3-pole device has been inserted into the audio jack.
if (registerValue & 0x01) { // Bitwise AND for bit 0 (Key Press 1) in Key Press Interrupts Register is set to 1
// If the Key Press interrupt register shows there has been a key press then the mic bias voltage was pulled
low by the 3-pole accessory
//Manually switch the audio jack internal switches to support a 3-pole accessory
writeDataToRegister(0x3C, 0x07);
writeDataToRegister(0x03, 0x08);
} else {
// Do nothing because it is a selfie stick
// If the Key press interrupt register does not show a key press then detection is complete and a selfie stick
has been inserted into the audio jack
}
}
} else {
// If the Accessory Status is a standard 4-pole or OMTP 4-pole accessory then detection is complete
// Do nothing since accessory is a 4-pole device
}
4
Conclusion
Selfie sticks are a popular smart phone accessory being inserted into the 3.5-mm audio jack receptacle. Smart phones now need the ability to
support and detect the difference between selfie sticks, 3-pole, standard 4-pole, and OMTP 4-pole audio accessories. TI’s TS3A227E and
TS3A225E audio jack switches provide cell phones with the ability to detect and support all of these different accessories. They can support these
devices because of their added manual switching control feature using the I2C protocol. With some simple I2C read and writes and a little bit of
logic, the TI audio jack provides the smart phone with the intelligence it needs to support the popular selfie sticks as well as traditional audio
accessories.
10
Detecting Selfie Sticks Using TI Audio Jack Switches TS3A227E and TS3A225E
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Appendix A
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A.1
Audio Jack Plug Configurations
There are different audio jack plug configurations for audio headsets, ones with microphones (4-pole) and
ones without microphones (3-pole). There are also two different 4-pole configurations, standard and
OMTP where the microphone may be either on the Ring 2 or Sleeve of the audio jack plug. Many codecs
require system designers to make a tough decision via a hardware connection which configuration they
support. This is done by directly connecting the microphone bias and the ground connections to the
Sleeve and Ring 2 pins of the audio jack. Hardwiring the microphone bias directly to the audio jack in the
standard configuration leaves the OMTP configuration unsupported and hardwiring the microphone bias
directly to the audio jack in the OMTP configuration leaves the standard configuration unsupported.
Table 1. Audio Jack Plug Configurations
Physical Connector
Tip
Ring
Internal Impedance Network
Sleeve
L
R
G
Pin Name
Configuration
Tip
Audio Left
Ring
Audio Right
Sleeve
Ground
TRS
16–2 kΩ
3-Pole TRS
16–2 kΩ
600–4 kΩ
L
G
Audio Left
Audio Right
Ring2
Ground
Sleeve
Microphone
Tip
Audio Left
M
Standard
Sleeve
Ring 2
Ring 1
Tip
R
Tip
Ring1
16–2 kΩ
16–2 kΩ
600–4 kΩ
4-Pole TRRS
L
R
M
Ring1
Audio Right
Ring2
Microphone
Sleeve
Ground
G
OMTP
16–2 kΩ
16–2 kΩ
TI’s audio jack switches allow hardware designers to support the multiple audio jack plug configurations by
detecting the presence and location of the microphone and routing the microphone bias and ground lines
appropriately. This allows smart phones to support all audio jack plug configurations.
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TI’s Audio Jack Switches Automatic Accessory Detection and Configuration
A.2
www.ti.com
TI’s Audio Jack Switches Automatic Accessory Detection and Configuration
TI’s audio jack switches include the TS3A225E, TS3A226AE, and TS3A227E. The audio jack switches
can differentiate between the 3-pole, standard 4-pole, and OMTP 4-pole configurations by leveraging the
closed circuit path between the Tip and Ring 2 and the Tip and Sleeve that is created when an audio jack
plug is inserted into the audio jack receptacle.
Headphones
Left Speaker
3.3 V
C1
C2
Right Speaker
R4
R3
R5
R2
R1
4
15
DET_TRIGGER
VDD
Application
Processor
16
14
TIP
MIC_PRESENT
9
7
SCL
RING2_SENSE
SDA
SLEEVE_SENSE
3
MICBIAS
13
C3
10
MICP
SLEEVE
5
GND_SENSE
G
12
6
MICI
R
RING2
INT
R6
L
8
11
GND_SENSE
GNDA
1
C4
2
FM Network
GND
GND
L1
TS3A227ERVAR
Figure 11. Typical Application Schematic With Headphone Accessory
Once an accessory is inserted closing the path between the Tip and Ring2 or Sleeve, the audio jack
switches automatically manipulate their internal switching network to route the microphone and ground
signals appropriately. Figure 12 – Figure 15 show examples of the TS3A227E switch network status with
and without different accessories inserted into the audio jack receptacle.
TS3 A227E
S3 PR
RING 2_SENSE
MICP
S 3PS
Audio Jack
S3GS
SLEEVE _SENSE
GND_SENSE
S3GR
RING2
SLEEVE
S1
S2
GND
RING2
GNDFET
SLEEVE
GNDFET
RING2
DFET
GNDA
SLEEVE
DFET
GND
Figure 12. TS3A227E Default Switch State With no Accessory Inserted
12
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TS3 A227E
S3 PR
RING 2_SENSE
MICP
S 3PS
Audio Jack
S3GS
SLEEVE _SENSE
GND_SENSE
L
R
?
?
S3GR
RING2
SLEEVE
S1
S2
RING2
GNDFET
GND
SLEEVE
GNDFET
RING2
DFET
GNDA
SLEEVE
DFET
GND
Figure 13. TS3A227E Switch State During Detection
TS3 A227E
S3 PR
RING 2_SENSE
MICP
S 3PS
Audio Jack
S3GS
SLEEVE _SENSE
GND_SENSE
L
R
G
S3GR
RING2
SLEEVE
S1
S2
GND
RING2
GNDFET
SLEEVE
GNDFET
GNDA
RING2
DFET
SLEEVE
DFET
GND
Figure 14. TS3A227E Switch State After Detecting a 3-Pole Headphone
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TI’s Audio Jack Switches Automatic Accessory Detection and Configuration
TS3 A227E
www.ti.com
S3PR
RING 2_SENSE
MICP
S3PS
Audio Jack
S3GS
SLEEVE _SENSE
GND_SENSE
L
R
M
G
S3GR
RING2
SLEEVE
S1
S2
GND
RING2
GNDFET
SLEEVE
GNDFET
RING2
DFET
GNDA
SLEEVE
DFET
GND
Figure 15. TS3A227E Switch State After Detecting a 4-Pole OMTP Headset
14
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