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TUSB320LAI, TUSB320HAI
SLLSEQ8D – OCTOBER 2015 – REVISED MAY 2017
TUSB320LAI, TUSB320HAI USB Type-C Configuration Channel Logic and Port Control
1 Features
3 Description
•
•
The TUSB320LA and TUSB320HA devices, hereafter
called TUSB320 unless otherwise noted, are Texas
Instrument's third generation Type-C configuration
channel logic and port controller. The TUSB320
devices use the CC pins to determine port attach and
detach, cable orientation, role detection, and port
control for Type-C current mode. The TUSB320
devices can be configured as a downstream facing
port (DFP), upstream facing port (UFP) or a dual role
port (DRP) making them ideal for any application.
1
•
•
•
•
•
•
•
•
•
•
USB Type-C™ Specification 1.1
Backward Compatible with USB Type-C
Specification 1.0
Supports Up to 3 A of Current Advertisement and
Detection
Mode Configuration
– Host Only – DFP (Source)
– Device Only – UFP (Sink)
– Dual Role Port – DRP
– Supports both Try.SRC and Try.SNK
Channel Configuration (CC)
– Attach of USB Port Detection
– Cable Orientation Detection
– Role Detection
– Type-C Current Mode (Default, Medium, High)
VBUS Detection
I2C or GPIO Control
Supports up to 400 kHz I2C
Role Configuration Control Through I2C
Supply Voltage: 2.7 V to 5 V
Low Current Consumption
Industrial Temperature Range of –40 to 85°C
The TUSB320 devices have an alternate
configuration as a DFP or UFP according to the
Type-C specifications. The CC logic block monitors
the CC1 and CC2 pins for pullup or pulldown
resistances to determine when a USB port has been
attached, the orientation of the cable, and the role
detected. The CC logic detects the Type-C current
mode as default, medium, or high depending on the
role detected. VBUS detection is implemented to
determine a successful attach in UFP and DRP
modes.
The devices operate over a wide supply range and
have low-power consumption. The TUSB320 is
available in two versions of enable: Active low enable
called TUSB320LA and active high enable called
TUSB320HA. The TUSB320 family of devices are
available in industrial temperature ranges.
Device Information(1)
2 Applications
•
•
•
•
PART NUMBER
Host, Device, Dual Role Port Applications
Mobile Phones
Tablets and Notebooks
USB Peripherals
PACKAGE
BODY SIZE (NOM)
TUSB320LAI
X2QFN (12)
1.60 mm × 1.60 mm
TUSB320HAI
X2QFN (12)
1.60 mm × 1.60 mm
(1) For all available packages, see the orderable addendum at
the end of the data sheet.
Simplified Schematic
VDD
Sample Applications
VBUS
VBUS
Detection
CC Logic
For Mode
Configuration and
Detection
I2C
CC1
CC2
GPIO
Controller
GND
GPIOs
Copyright © 2016, Texas Instruments Incorporated
1
An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications,
intellectual property matters and other important disclaimers. PRODUCTION DATA.
TUSB320LAI, TUSB320HAI
SLLSEQ8D – OCTOBER 2015 – REVISED MAY 2017
www.ti.com
Table of Contents
1
2
3
4
5
6
7
Features ..................................................................
Applications ...........................................................
Description .............................................................
Revision History.....................................................
Pin Configuration and Functions .........................
Specifications.........................................................
1
1
1
2
3
4
6.1
6.2
6.3
6.4
6.5
6.6
6.7
4
4
4
4
5
6
6
Absolute Maximum Ratings ......................................
ESD Ratings..............................................................
Recommended Operating Conditions.......................
Thermal Information ..................................................
Electrical Characteristics...........................................
Timing Requirements ................................................
Switching Characteristics ..........................................
Detailed Description .............................................. 8
7.1
7.2
7.3
7.4
Overview ................................................................... 8
Feature Description................................................... 9
Device Functional Modes........................................ 13
Programming........................................................... 15
7.5 Register Maps ......................................................... 16
8
Application and Implementation ........................ 21
8.1 Application Information............................................ 21
8.2 Typical Application .................................................. 21
8.3 Initialization Setup .................................................. 28
9 Power Supply Recommendations...................... 28
10 Layout................................................................... 29
10.1 Layout Guidelines ................................................. 29
10.2 Layout Example .................................................... 29
11 Device and Documentation Support ................. 30
11.1
11.2
11.3
11.4
11.5
11.6
Related Links ........................................................
Receiving Notification of Documentation Updates
Community Resources..........................................
Trademarks ...........................................................
Electrostatic Discharge Caution ............................
Glossary ................................................................
30
30
30
30
30
30
12 Mechanical, Packaging, and Orderable
Information ........................................................... 30
4 Revision History
Changes from Revision C (October 2016) to Revision D
•
Page
Changed RVBUS values From: MIN = 891, TYP = 900, MAX = 909 KΩ To: MIN = 855, TYP = 887, MAX = 920 KΩ ........... 6
Changes from Revision B (September 2016) to Revision C
Page
•
Changed text for Pin 7 in the Pin Functions table From: "default current mode detected (H); medium or high current
mode detected (L)." To: "Refer to Table 3 for more details." ................................................................................................ 3
•
Changed text for Pin 8 in the Pin Functions table From: "default or medium current mode detected (H); high current
mode detected (L)." To: "Refer to Table 3 for more details." ................................................................................................ 3
Changes from Revision A (March 2016) to Revision B
•
Page
Changed pins CC1 and CC2 values From: MIN = –0.3 MAX = VDD + 0.3 To: MIN –0.3 MAX = 6 in the Absolute
Maximum Ratings ................................................................................................................................................................... 4
Changes from Original (October 2015) to Revision A
Page
•
Added Note 1 and 2 to the Pin Functions table...................................................................................................................... 3
•
Changed the DESCRIPTION of pin EN_N pin in the Pin Functions table ............................................................................. 3
•
Changed the DESCRIPTION of pin EN pin in the Pin Functions table.................................................................................. 3
•
Changed the DESCRIPTION of pin VDD in the Pin Functions table ....................................................................................... 3
•
Added Note 2 to the Electrical Characteristics table ............................................................................................................. 5
•
Added Test Condition "See Figure 1" to VBUS_THR in the Electrical Characteristics ......................................................... 6
•
Changed the last sentence of the Debug Accessory section............................................................................................... 12
•
Added Note: "SW must make sure..." to the Description of INTERRUPT_STATUS in Table 9 ......................................... 18
•
Added text to list item 2 in the TUSB320LA Initialization Procedure section ....................................................................... 28
•
Added text to list item 2 in the TUSB320HA Initialization Procedure section ...................................................................... 28
2
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Product Folder Links: TUSB320LAI TUSB320HAI
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SLLSEQ8D – OCTOBER 2015 – REVISED MAY 2017
5 Pin Configuration and Functions
VDD
VBUS_DET
4
11
EN_N
ADDR
5
10
GND
INT_N/OUT3
6
9
ID
7
8
SCL/OUT2
12
SDA/OUT1
3
CC1
2
1
PORT
3
12
VDD
VBUS_DET
4
11
EN
ADDR
5
10
GND
INT_N/OUT3
6
9
ID
7
8
SCL/OUT2
1
PORT
CC2
CC1
2
RWB Package
12-Pin X2QFN
TUSB320HA Top View
SDA/OUT1
CC2
RWB Package
12-Pin X2QFN
TUSB320LA Top View
Pin Functions
PIN
NAME
TYPE
DESCRIPTION
TUSB320LA
TUSB320HA
CC1
1
1
I/O
Type-C configuration channel signal 1
CC2
2
2
I/O
Type-C configuration channel signal 2
PORT (1)
3
3
I
Tri-level input pin to indicate port mode. The state of this pin is sampled when EN_N is
asserted low in the TUSB320L device, EN is asserted high in the TUSB320H device, and VDD
is active. This pin is also sampled following a I2C_SOFT_RESET.
H - DFP (Pull-up to VDD if DFP mode is desired)
NC - DRP (Leave unconnected if DRP mode is desired)
L - UFP (Pull-down or tie to GND if UFP mode is desired)
VBUS_DET (1)
4
4
I
5-V to 28-V VBUS input voltage. VBUS detection determines UFP attachment. One 900-kΩ
external resistor required between system VBUS and VBUS_DET pin.
ADDR (1)
5
5
I
Tri-level input pin to indicate I2C address or GPIO mode:
H — I2C is enabled and I2C 7-bit address is 0x67.
NC — GPIO mode (I2C is disabled)
L — I2C is enabled and I2C 7-bit address is 0x47.
ADDR pin should be pulled up to VDD if high configuration is desired
INT_N/OUT3 (1)
6
6
O
The INT_N/OUT3 is a dual-function pin. When used as the INT_N, the pin is an open drain
output in I2C control mode and is an active low interrupt signal for indicating changes in I2C
registers. When used as OUT3, the pin is in audio accessory detect in GPIO mode: no
detection (H), audio accessory connection detected (L).
SDA/OUT1 (1) (2)
7
7
I/O
The SDA/OUT1 is a dual-function pin. When I2C is enabled (ADDR pin is high or low), this pin
is the I2C communication data signal. When in GPIO mode (ADDR pin is NC), this pin is an
open drain output for communicating Type-C current mode detect when the device is in UFP
mode: Refer to Table 3 for more details.
8
8
I/O
The SCL/OUT2 is a dual function pin. When I2C is enabled (ADDR pin is high or low), this pin
is the I2C communication clock signal. When in GPIO mode (ADDR pin is NC), this pin is an
open drain output for communicating Type-C current mode detect when the device is in UFP
mode: Refer to Table 3 for more details.
ID
9
9
O
Open drain output; asserted low when the CC pins detect device attachment when port is a
source (DFP), or dual-role (DRP) acting as source (DFP).
GND
10
10
G
Ground
EN_N
11
—
I
Enable signal; active low. Pulled up to VDD internally to disable the TUSB320L device. If
controlled externally, must be held low at least for 50 ms after VDD has reached its valid
voltage level.
EN
—
11
I
Enable signal; active high. Pulled down to GND internally to disable the TUSB320H device. If
controlled externally, must be held low at least for 50 ms after VDD has reached its valid
voltage level.
VDD
12
12
P
Positive supply voltage. VDD must ramp within 25 ms or less
SCL/OUT2
(1)
(2)
(1) (2)
When VDD is off, the TUSB320 non-failsafe pins (VBUS_DET, ADDR, PORT, OUT[3:1] pins) could back-drive the TUSB320 device if not
handled properly. When necessary to pull these pins up, it is recommended to pullup PORT, ADDR, and INT_N/OUT3 to the device VDD
supply. The VBUS_DET must be pulled up to VBUS through a 900-kΩ resistor.
When using the 3.3 V supply for I2C, the end user must ensure that the VDD is 3 V and above. Otherwise the I2C may back power the
device.
Copyright © 2015–2017, Texas Instruments Incorporated
Product Folder Links: TUSB320LAI TUSB320HAI
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6 Specifications
6.1 Absolute Maximum Ratings
over operating free-air temperature range (unless otherwise noted) (1)
Supply voltage
Control pins
MIN
MAX
UNIT
VDD
–0.3
6
V
PORT, ADDR, ID, EN_N, INT_N/OUT3
–0.3
VDD + 0.3
CC1, CC2
–0.3
6
SDA/OUT1, SCL/OUT2
–0.3
VDD + 0.3
VBUS_DET , EN
–0.3
4
–65
150
Storage temperature, Tstg
(1)
V
°C
Stresses beyond those listed under Absolute Maximum Ratings may cause permanent damage to the device. These are stress ratings
only, which do not imply functional operation of the device at these or any other conditions beyond those indicated under Recommended
Operating Conditions. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability.
6.2 ESD Ratings
VALUE
V(ESD)
(1)
(2)
Electrostatic discharge
Human-body model (HBM), per ANSI/ESDA/JEDEC JS-001 (1)
±3000
Charged-device model (CDM), per JEDEC specification JESD22C101 (2)
±1500
UNIT
V
JEDEC document JEP155 states that 500-V HBM allows safe manufacturing with a standard ESD control process.
JEDEC document JEP157 states that 250-V CDM allows safe manufacturing with a standard ESD control process.
6.3 Recommended Operating Conditions
over operating free-air temperature range (unless otherwise noted)
MIN
VDD
Supply voltage range
2.7
VBUS
System VBUS voltage
4
TA
TUSB320HAI and TUSB320LAI Operating free air temperature
range
–40
NOM
MAX
UNIT
5
V
5
28
V
25
85
°C
6.4 Thermal Information
TUSB320
THERMAL METRIC (1)
RWB (X2QFN)
UNIT
12 PINS
RθJA
Junction-to-ambient thermal resistance
169.3
°C/W
RθJC(top)
Junction-to-case (top) thermal resistance
68.1
°C/W
RθJB
Junction-to-board thermal resistance
83.4
°C/W
ψJT
Junction-to-top characterization parameter
2.2
°C/W
ψJB
Junction-to-board characterization parameter
83.4
°C/W
RθJC(bot)
Junction-to-case (bottom) thermal resistance
N/A
(1)
4
For more information about traditional and new thermal metrics, see the Semiconductor and C Package Thermal Metrics application
report, SPRA953.
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SLLSEQ8D – OCTOBER 2015 – REVISED MAY 2017
6.5 Electrical Characteristics
over operating free-air temperature range (unless otherwise noted)
TEST
CONDITIONS
PARAMETER
MIN
TYP
MAX
UNIT
POWER CONSUMPTION
IUNATTACHED_UFP
Current consumption in unattached mode when port is
unconnected and waiting for connection. [VDD = 4.5 V,
EN_N (TUSB320LA) = L, EN (TUSB320HA) = H, ADDR =
NC, PORT = L]
70
µA
IACTIVE_UFP
Current consumption in active mode. [VDD = 4.5 V, EN_N
(TUSB320LA) = L, EN (TUSB320HA) = H, ADDR = NC,
PORT = L]
70
µA
ISHUTDOWN
Leakage current when VDD is supplied, but the TUSB320
device is not enabled. [VDD = 4.5 V, EN_N (TUSB320LA) =
H, EN (TUSB320HA) = L]
0.04
µA
CC1 AND CC2 PINS
RCC_DB
Pulldown resistor when in dead-battery mode.
4.1
5.1
6.1
kΩ
RCC_D
Pulldown resistor when in UFP or DRP mode.
4.6
5.1
5.6
kΩ
VUFP_CC_USB
Voltage level range for detecting a DFP attach when
configured as a UFP and DFP is advertising default current
source capability.
0.25
0.61
V
VUFP_CC_MED
Voltage level range for detecting a DFP attach when
configured as a UFP and DFP is advertising medium (1.5A) current source capability.
0.7
1.16
V
VUFP_CC_HIGH
Voltage level range for detecting a DFP attach when
configured as a UFP and DFP is advertising high (3-A)
current source capability.
1.31
2.04
V
VTH_DFP_CC_USB
Voltage threshold for detecting a UFP attach when
configured as a DFP and advertising default current source
capability.
1.51
1.6
1.64
V
VTH_DFP_CC_MED
Voltage threshold for detecting a UFP attach when
configured as a DFP and advertising medium current (1.5A) source capability.
1.51
1.6
1.64
V
VTH_DFP_CC_HIGH
Voltage threshold for detecting a UFP attach when
configured as a DFP and advertising high current (3.0-A)
source capability.
2.46
2.6
2.74
V
ICC_DEFAULT_P
Default mode pullup current source when operating in DFP
or DRP mode.
64
80
96
µA
ICC_MED_P
Medium (1.5-A) mode pullup current source when
operating in DFP or DRP mode.
166
180
194
µA
ICC_HIGH_P
High (3-A) mode pullup current source when operating in
DFP or DRP mode. (1)
304
330
356
µA
0.4
V
CONTROL PINS: PORT, ADDR, INT/OUT3, EN_N, EN, ID
VIL
Low-level control signal input voltage (PORT, ADDR,
EN_N, EN)
VIM
Mid-level control signal input voltage (PORT, ADDR)
0.28 × VDD
0.56 × VDD
V
VIH
High-level control signal input voltage (PORT, ADDR,
EN_N)
VDD – 0.3
VDD
V
VIH_EN
High-Level control signal input voltage for EN for
TUSB320HA
1.05
3.65
V
IIH
High-level input current
–20
20
µA
IIL
Low-level input current
–10
10
µA
10
µA
VDD = 0 V; ID = 5
V
IID_LEAKAGE
Current Leakage on ID pin
REN_N
Internal pullup resistance for EN_N for TUSB320LA
1.1
MΩ
REN
Internal pulldown resistance for EN for TUSB320HA
500
kΩ
Rpu (2)
Internal pullup resistance (PORT, ADDR)
588
kΩ
Internal pulldown resistance (PORT, ADDR)
1.1
MΩ
Rpd
VOL
(1)
(2)
(2)
Low-level signal output voltage (open-drain) (INT_N/OUT3,
ID)
IOL = –1.6 mA
0.4
V
VDD must be 3.5 V or greater to advertise 3 A current.
Internal pullup and pulldown for PORT and ADDR are removed after the device has sampled EN = high or EN_N = low.
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Electrical Characteristics (continued)
over operating free-air temperature range (unless otherwise noted)
TEST
CONDITIONS
PARAMETER
MIN
TYP
MAX
UNIT
Rp_ODext
External pullup resistor on open drain IOs (INT_N/OUT3,
ID)
200
kΩ
Rp_TLext
Tri-level input external pullup resistor (PORT, ADDR)
4.7
kΩ
I2C - SDA/OUT1, SCL/OUT2 CAN OPERATE FROM 1.8 V OR 3.3 V (±10%) (3)
VDD_I2C
Supply range for I2C (SDA/OUT1, SCL/OUT2)
1.65
VIH
High-level signal voltage
1.05
VIL
Low-level signal voltage
VOL
Low-level signal output voltage (open drain)
1.8
IOL = –1.6 mA
3.6
V
3.6
V
0.4
V
0.4
V
VBUS_DET IO PINS (CONNECTED TO SYSTEM VBUS SIGNAL)
VBUS_THR
VBUS threshold range
RVBUS
External resistor between VBUS and VBUS_DET pin
RVBUS_PD
Internal pulldown resistance for VBUS_DET
(3)
See Figure 1
2.95
3.3
3.8
V
855
887
920
KΩ
95
KΩ
2
When using 3.3 V for I C, customer must ensure VDD is above 3.0 V at all times.
6.6 Timing Requirements
MIN
NOM
MAX
UNIT
2
I C (SDA, SCL)
tSU:DAT
Data setup time
100
tHD;DAT
Data hold time
10
ns
ns
tSU:STA
Set-up time, SCL to start condition
0.6
µs
tHD:STA
Hold time (repeated), start condition to SCL
0.6
µs
tSU:STO
Set up time for stop condition
0.6
µs
tBUF
Bus free time between a stop and start condition
1.3
µs
tVD;DAT
Data valid time
0.9
tVD;ACK
Data valid acknowledge time
0.9
µs
fSCL
SCL clock frequency; I2C mode for local I2C control
400
kHz
tr
Rise time of both SDA and SCL signals
300
ns
tf
Fall time of both SDA and SCL signals
300
ns
CBUS_100KHZ Total capacitive load for each bus line when operating at ≤ 100 kHz
400
pF
CBUS_400KHz Total capacitive load for each bus line when operating at 400 kHz
100
pF
MAX
UNIT
µs
6.7 Switching Characteristics
over operating free-air temperature range (unless otherwise noted)
PARAMETER
TEST CONDITIONS
tCCCB_DEFAULT
Power on default of CC1 and CC2 voltage debounce
time
tVBUS_DB
Debounce of VBUS_DET pin after valid VBUS_THR
tDRP_DUTY_CYCLE
Power-on default of percentage of time DRP
advertises DFP during a tDRP
tDRP
The period during which the TUSB320HA or the
TUSB320LA in DFP mode completes a DFP to UFP
and back advertisement.
tI2C_EN
Time from TUSB320LA EN_N low or TUSB320HA EN
high and VDD active to I2C access available
tSOFT_RESET
Soft reset duration
6
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MIN
DEBOUCE
register = 2'b00
DRP_DUTY_CYCLE
register = 2'b00
TYP
168
ms
2
ms
30%
50
26
75
49
100
ms
100
ms
95
ms
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VBUS
VBUS_THR
TVBUS_DB
0V
Figure 1. VBUS Detect and Debounce
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7 Detailed Description
7.1 Overview
VDD
The USB Type-C ecosystem operates around a small form factor connector and cable that is flippable and
reversible. Because of the nature of the connector, a scheme is required to determine the connector orientation.
Additional schemes are required to determine when a USB port is attached and what the acting role of the USB
port (DFP, UFP, DRP) is, as well as to communicate Type-C current capabilities. These schemes are
implemented over the CC pins according to the USB Type-C pecification. The TUSB320 devices provide
Configuration Channel (CC) logic for determining USB port attach and detach, role detection, cable orientation,
and Type-C current mode. The TUSB320 devices also contains several features such as mode configuration and
low standby current which make these devices ideal for source or sinks in USB2.0 applications.
ADDR
3-State Buffer
PORT
CC1
Connection and
cable detection
VBUS_ON
SCL/OUT2
Open Drain
Output
CTRL_EN
ID
VBUS Detection
SYS_VBUS
VBUS_DET
INT/OUT3
EN_N Logic
GND
EN_N
VBUS_ON
CTRL_EN_N
CSR
CTRL_ID
I2C
CC2
CTRL_INT
SDA/OUT1
CTRL_ID
CTRL_INT
Digital Controller
900 K ±1%
Copyright © 2016, Texas Instruments Incorporated
Figure 2. Functional Block Diagram of TUSB320
7.1.1 Cables, Adapters, and Direct Connect Devices
Type-C specification defines several cables, plugs, and receptacles to be used to attach ports. The TUSB320
devices support all cables, receptacles, and plugs. The TUSB320 devices do not support any USB Type-C
feature which requires USB power delivery communication over CC lines like e-marking or alternate mode.
7.1.1.1 USB Type-C Receptacles and Plugs
Below is list of Type-C receptacles and plugs supported by the TUSB320 devices:
• USB Type-C receptacle for USB2.0 platforms and devices
8
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Overview (continued)
•
•
USB full-featured Type-C plug
USB2.0 Type-C plug
7.1.1.2 USB Type-C Cables
Below is a list of Type-C cables types supported by the TUSB320 devices:
• USB full-featured Type-C cable
• USB2.0 Type-C cable with USB2.0 plug
• Captive cable on remote device with either a USB full-featured plug or USB2.0 plug
7.1.1.3 Legacy Cables and Adapters
The TUSB320 devices support legacy cable adapters as defined by the Type-C specification. The cable adapter
must correspond to the mode configuration of a TUSB320 device.
Figure 3 displays the TUSB320 Legacy Adapter Implementation Circuit.
To System VBUS detection
VBUS
900 kΩ ± 1%
Rp (56k ± 5%)
VBUS_DET
TUSB320
CC
CC
Rd (5.1k ± 10%)
Legacy Host Adapter
Copyright © 2016, Texas Instruments Incorporated
Figure 3. Legacy Adapter Implementation Circuit
7.1.1.4 Direct Connect Devices
The TUSB320 devices support the attaching and detaching of a direct-connect device.
7.1.1.5 Audio Adapters
Additionally, the TUSB320 devices support audio adapters for audio accessory mode, including:
• Passive Audio Adapter
• Charge Through Audio Adapter
7.2 Feature Description
7.2.1 Port Role Configuration
The TUSB320 devices can be configured as a downstream facing port (DFP), upstream facing port (UFP), or
dual-role port (DRP) using the tri-level PORT pin. The PORT pin should be pulled high to VDD using a pullup
resistance, low to GND or left as floated on the PCB to achieve the desired mode. This flexibility allows a
TUSB320 device to be used in a variety of applications. A TUSB320 device samples the PORT pin after reset
and maintains the desired mode until the TUSB320 device is reset again. The port role can also be selected
through I2C registers. Table 1 lists the supported features in each mode:
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Feature Description (continued)
Table 1. Supported Features for the TUSB320 Device by Mode
PORT PIN
HIGH
(DFP ONLY)
LOW
(UFP ONLY)
NC
(DRP)
Port attach and
detach
Yes
Yes
Yes
Cable orientation
(through I2C)
Yes
Yes
Yes
Current advertisement
Yes
-
Yes (DFP)
Current detection
-
Yes
Yes (UFP)
Accessory modes
(audio and debug)
Yes
Yes
Yes
Try.SRC
-
-
Yes
Try.SNK
-
-
Yes
Active cable detection
Yes
-
Yes (DFP)
I2C / GPIO
Yes
Yes
Yes
Legacy cables
Yes
Yes
Yes
VBUS detection
-
Yes
Yes (UFP)
SUPPORTED
FEATURES
7.2.1.1 Downstream Facing Port (DFP) - Source
The TUSB320 device can be configured as a DFP-only by pulling the PORT pin high through a resistance to VDD
or by changing the MODE_SELECT register. In DFP-only mode, the TUSB320 device constantly presents Rps
on both CC. In DFP-only mode, the TUSB320 device initially advertises default USB Type-C current. The Type-C
current can be adjusted through I2C if the system requires to increase the amount advertised. The TUSB320
device adjusts the Rps to match the desired Type-C current advertisement. In GPIO mode, the TUSB320 device
only advertises default Type-C current.
When configured as a DFP, the TUSB320 device can operate with older USB Type-C 1.0 devices except for a
USB Type-C 1.0 DRP device. A USB Type-C 1.1 compliant DFP can not connect to a Type-C 1.0 DRP. Because
the TUSB320 device is compliant to Type-C 1.1, the TUSB320 device can not operate with a USB Type-C 1.0
DRP device. This limitation is a result of a backwards compatibility problem between USB Type-C 1.1 DFP and a
USB Type-C 1.0 DRP.
7.2.1.2 Upstream Facing Port (UFP) - Sink
The TUSB320 device can be configured as a UFP only by pulling the PORT pin low to GND. In UFP mode, the
TUSB320 device constantly presents pulldown resistors (Rd) on both CC pins. The TUSB320 device monitors
the CC pins for the voltage level corresponding to the Type-C mode current advertisement by the connected
DFP. The TUSB320 device debounces the CC pins and wait for VBUS detection before successfully attaching. As
a UFP, the TUSB320 device detects and communicates the advertised current level of the DFP to the system
through the OUT1 and OUT2 GPIOs (if in GPIO mode) or through the I2C CURRENT_MODE_DETECT register
one time in the Attached.SNK state.
7.2.1.3 Dual Role Port (DRP)
The TUSB320 device can be configured to operate as a DRP when the PORT pin is left floated on the PCB. In
DRP mode, the TUSB320 device toggles between operating as a DFP and a UFP. When functioning as a DFP in
DRP mode, the TUSB320 device complies with all operations as defined for a DFP according to the Type-C
specification. When presenting as a UFP in DRP mode, the TUSB320 device operates as defined for a UFP
according to the Type-C specification.
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The TUSB320 supports two optional Type-C DRP features called Try.SRC and Try.SNK. Products supporting
dual-role functionality may have a requirement to be a source (DFP) or a sink (UFP) when connected to another
dual-role capable product. For example, a dual-role capable notebook can be a source when connected to a
tablet, or a cell phone can be a sink when connected to a notebook or tablet. When standard DRP products
(products which don’t support either Try.SRC or Try.SNK) are connected together, the role (UFP or DFP)
outcome is not predetermined. These two optional DRP features provide a means for dual-role capable products
to connect to another dual-role capable product in the role desired. Try.SRC and Try.SNK are only available
when TUSB320 is configured in I2C mode. When operating in GPIO mode, the TUSB320 will always operate as
a standard DRP.
The Try.SRC feature of the TUSB320 device provides a means for a DRP product to connect as a DFP when
connected to another DRP product that doesn’t implement Try.SRC. When two products which implement
Try.SRC are connected together, the role outcome of either UFP or DFP is the same as a standard DRP.
Try.SRC is enabled by changing I2C register SOURCE_PREF to 2’b11. Once this register is changed to 2’b11,
the TUSB320 will always attempt to connect as a DFP when attached to another DRP capable device.
The Try.SNK feature of the TUSB320 device provides a method for a DRP product to connect as a UFP when
connected to another DRP product that doesn’t implement Try.SNK. When two products which implement
Try.SNK are connected together, the role outcome of either UFP or DFP is the same as a standard DRP.
Try.SNK is enabled by changing I2C register SOURCE_PREF to 2’b01. Once this register is changed to 2’b01,
the TUSB320 will always attempt to connect as a UFP when attached to another DRP capable device.
7.2.2 Type-C Current Mode
When a valid cable detection and attach have been completed, the DFP has the option to advertise the level of
Type-C current a UFP can sink. The default current advertisement for the TUSB320 device is max of 500 mA (for
USB2.0) or max of 900 mA (for USB3.1). If a higher level of current is available, the I2C registers can be written
to provide medium current at 1.5 A or high current at 3 A. When the CURRENT_MODE_ADVERTISE register
has been written to advertise higher than default current, the DFP adjusts the Rps for the specified current level.
If a DFP advertises 3 A, system designer must ensure that the VDD of the TUSB320 device is 3.5 V or greater.
Table 2 lists the Type-C current advertisements in GPIO an I2C modes.
Table 2. Type-C Current Advertisement for GPIO and I2C Modes
Default
max of 500
mA (USB2.0)
max of 900
mA (USB3.1)
Medium - 1.5 A (max)
I2C MODE (ADDR PIN H, L)
GPIO MODE (ADDR PIN IN NC)
TYPE-C CURRENT
UFP (PORT PIN L)
Current mode detected
and output through OUT1
/ OUT2
DFP (PORT PIN H)
Only advertisement
UFP
Current mode detected
and read through I2C
register
N/A
High - 3 A (max)
DFP
I2C register default is 500
or 900 mA (max)
Advertisement selected
through writing I2C
register
7.2.3 Accessory Support
The TUSB320 device supports audio and debug accessories in UFP, DFP mode and DRP mode. Audio and
debug accessory support is provided through reading of I2C registers. Audio accessory is also supported through
GPIO mode with INT_N/OUT3 pin (audio accessory is detected when INT_N/OUT3 pin is low).
7.2.3.1 Audio Accessory
Audio accessory mode is supported through two types of adapters. First, the passive audio adapter can be used
to convert the Type-C connector into an audio port. To effectively detect the passive audio adapter, the TUSB320
device must detect a resistance < Ra on both of the CC pins.
Secondly, a charge through audio adapter can be used. The primary difference between a passive and charge
through adapter is that the charge through adapter supplies 500 mA of current over VBUS. The charge through
adapter contains a receptacle and a plug. The plug acts as a DFP and supply VBUS when the plug detects a
connection.
When the TUSB320 device is configured in GPIO mode, OUT3 pin determines if an audio accessory is
connected. When an audio accessory is detected, the OUT3 pin is pulled low.
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7.2.3.2 Debug Accessory
Debug is an additional state supported by USB Type-C. The specification does not define a specific user
scenario for this state, but the specification is important because the end user could use debug accessory mode
to enter a test state for production specific to the application. The TUBS320 device will detect a debug accessory
if Rd or Rp is detected on both CC1 and CC2.
7.2.4 I2C and GPIO Control
The TUSB320 device can be configured for I2C communication or GPIO outputs using the ADDR pin. The ADDR
pin is a tri-level control pin. When the ADDR pin is left floating (NC), the TUSB320 device is in GPIO output
mode. When the ADDR pin is pulled high or pulled low, the TUSB320 device is in I2C mode.
All outputs for the TUSB320 device are open drain configuration.
The OUT1 and OUT2 pins are used to output the Type-C current mode when in GPIO mode. Additionally, the
OUT3 pin is used to communicate the audio accessory mode in GPIO mode. Table 3 lists the output pin settings.
See the Pin Configuration and Functions section for more information.
Table 3. Simplified Operation for OUT1 and OUT2
OUT1
OUT2
ADVERTISEMENT
H
H
Default Current in Unattached State
H
L
Default Current in Attached State
L
H
Medium Current (1.5 A) in Attached State
L
L
High Current (3.0 A) in Attached State
When operating in I2C mode, the TUSB320 device uses the SCL and SDA lines for clock and data and the
INT_N pin to communicate a change in I2C registers, or an interrupt, to the system. The INT_N pin is pulled low
when the TUSB320 device updates the registers with new information. The INT_N pin is open drain. The
INTERRUPT_STATUS register will be set when the INT_N pin is pulled low. To clear the INTERRUPT_STATUS
register, the end user writes to I2C.
When operating in GPIO mode, the OUT3 pin is used in place of the INT_N pin to determine if an audio
accessory is detected and attached. The OUT3 pin is pulled low when an audio accessory is detected.
NOTE
When using the 3.3 V supply for I2C, the end user must ensure that the VDD is 3 V and
above. Otherwise the I2C can back power the device.
7.2.5 VBUS Detection
The TUSB320 device supports VBUS detection according to the Type-C specification. VBUS detection is used to
determine the attachment and detachment of a UFP and to determine the entering and exiting of accessary
modes. VBUS detection is also used to successfully resolve the role in DRP mode.
The system VBUS voltage must be routed through a 900-kΩ resistor to the VBUS_DET pin on the TUSB320
device if the PORT pin is configured as a DRP or a UFP. If the TUSB320 device is configured as a DFP and only
ever used in DFP mode, the VBUS_DET pin can be left unconnected.
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7.3 Device Functional Modes
The TUSB320 device has four functional modes. Table 4 lists these modes:
Table 4. USB Type-C States According to TUSB320 Functional Modes
MODES
GENERAL BEHAVIOR
STATES (1)
PORT PIN
Unattached.SNK
Unattached.Accessory
UFP
Unattached
USB port unattached. ID, PORT
operational. I2C on. CC pins
configure according to PORT pin.
AttachWait.Accessory
AttachWait.SNK
DRP
Toggle Unattached.SNK → Unattached.SRC
AttachedWait.SRC or AttachedWait.SNK
Unattached.SRC
DFP
AttachWait.SRC
Attached.SNK
UFP
Audio accessory
Debug accessory.SNK
Attached.SNK
Active
USB port attached. All GPIOs
operational. I2C on.
Attached.SRC
DRP
Audio accessory
Debug accessory.SNK or Debug accessory.SRC
Attached.SRC
DFP
Audio accessory
Debug accessory.SRC
Dead battery
No operation.
VDD not available.
UFP/DRP/DFP
Default device state to UFP/SNK with Rd.
Shutdown
VDD available.
TUSB320LA EN_N pin high.
TUSB320HA EN pin low.
UFP/DRP/DFP
Default device state to UFP/SNK with Rd.
(1)
Required; not in sequential order.
7.3.1 Unattached Mode
Unattached mode is the primary mode of operation for the TUSB320 device, because a USB port can be
unattached for a lengthy period of time. In unattached mode, VDD is available, and all IOs and I2C are
operational. After the TUSB320 device is powered up, the part enters unattached mode until a successful attach
has been determined. Initially, right after power up, the TUSB320 device comes up as an Unattached.SNK. The
TUSB320 device checks the PORT pin and operates according to the mode configuration. The TUSB320 device
toggles between the UFP and the DFP if configured as a DRP. In unattached mode, I2C can be used to change
the mode configuration or port role if the board configuration of the PORT pin is not the desired mode. Writing to
the I2C MODE_SELECT register can override the PORT pin in unattached mode. The PORT pin is only sampled
at reset (EN_N high to low transition for the TUSB320LA device or the EN low to high transition for
theTUSB320HA device), after I2C_SOFT_RESET, or power up. I2C must be used after reset to change the
device mode configuration.
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7.3.2 Active Mode
Active mode is defined as the port being attached. In active mode, all GPIOs are operational, and I2C is read /
write (R/W). When in active mode, the TUSB320 device communicates to the AP that the USB port is attached.
This communication happens through the ID pin if TUSB320 is configured as a DFP or DRP connect as source.
If TUSB320 is configured as a UFP or a DRP connected as a sink, the OUT1/OUT2 and INT_N/OUT3 pins are
used. The TUSB320 device exits active mode under the following conditions:
• Cable unplug
• VBUS removal if attached as a UFP
• Dead battery; system battery or supply is removed
• TUSB320LA EN_N pin floated or pulled high
• TUSB320HA EN pin floated or pulled low.
During active mode, I2C be used to change the mode configuration following the sequence below. This same
sequence is valid when TUSB320 is in unattached mode.
• Set the DISABLE_TERM register (address 0x0A bit 0) to a 1'b1.
• Change the MODE_SELECT register (address 0x0A bits 5:4) to desired mode of operation.
• Wait 5 ms.
• Clear the DISABLE_TERM register (address 0x0A bit 0) to 1'b0.
7.3.3 Dead Battery Mode
During dead battery mode, VDD is not available. CC pins always default to pulldown resistors in dead battery
mode. Dead battery mode means:
• TUSB320 in UFP with 5.1-kΩ ± 20% Rd; cable connected and providing charge
• TUSB320 in UFP with 5.1-kΩ ± 20% Rd; nothing connected (application could be off or have a discharged
battery)
NOTE
When VDD is off, the TUSB320 non-failsafe pins (VBUS_DET, ADDR, PORT, OUT[3:1]
pins) could back-drive the TUSB320 device if not handled properly. When necessary to
pull these pins up, TI recommendeds pulling up PORT, ADDR, and INT_N/OUT3 to the
device’s VDD supply. The VBUS_DET must be pulled up to VBUS through a 900-kΩ
resistor.
7.3.4 Shutdown Mode
Shutdown mode for TUSB320LA device is defined as follows:
• Supply voltage available and EN_N pin is pulled high or floating.
• EN_N pin has internal pullup resistor.
• The TUSB320LA device is off, but still maintains the Rd on the CC pins
Shutdown mode for TUSB320HA device is defined as follows:
• Supply voltage available and EN pin is pulled low or floating.
• EN pin has internal pulldown resistor.
• The TUSB320HA device is off, but still maintains the Rd on the CC pins
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7.4 Programming
For further programmability, the TUSB320 device can be controlled using I2C. The TUSB320 device local I2C
interface is available for reading/writing after TI2C_EN when the device is powered up. The SCL and SDA terminals
are used for I2C clock and I2C data respectively. If I2C is the preferred method of control, the ADDR pin must be
set accordingly.
Table 5. TUSB320 I2C Addresses
TUSB320 I2C Target Address
ADDR pin
Bit 7 (MSB)
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0 (W/R)
H
1
1
0
0
1
1
1
0/1
L
1
0
0
0
1
1
1
0/1
The following procedure should be followed to write to TUSB320 I2C registers:
1. The master initiates a write operation by generating a start condition (S), followed by the TUSB320 7-bit
address and a zero-value R/W bit to indicate a write cycle.
2. The TUSB320 device acknowledges the address cycle.
3. The master presents the sub-address (I2C register within the TUSB320 device) to be written, consisting of
one byte of data, MSB-first.
4. The TUSB320 device acknowledges the sub-address cycle.
5. The master presents the first byte of data to be written to the I2C register.
6. The TUSB320 device acknowledges the byte transfer.
7. The master can continue presenting additional bytes of data to be written, with each byte transfer completing
with an acknowledge from the TUSB320 device.
8. The master terminates the write operation by generating a stop condition (P).
The following procedure should be followed to read the TUSB320 I2C registers:
1. The master initiates a read operation by generating a start condition (S), followed by the TUSB320 7-bit
address and a one-value R/W bit to indicate a read cycle.
2. The TUSB320 device acknowledges the address cycle.
3. The TUSB320 device transmits the contents of the memory registers MSB-first starting at register 00h or last
read sub-address+1. If a write to the T I2C register occurred prior to the read, then the TUSB320 device
starts at the sub-address specified in the write.
4. The TUSB320 device waits for either an acknowledge (ACK) or a not-acknowledge (NACK) from the master
after each byte transfer; the I2C master acknowledges reception of each data byte transfer.
5. If an ACK is received, the TUSB320 device transmits the next byte of data.
6. The master terminates the read operation by generating a stop condition (P).
The following procedure should be followed for setting a starting sub-address for I2C reads:
1. The master initiates a write operation by generating a start condition (S), followed by the TUSB320 7-bit
address and a zero-value R/W bit to indicate a read cycle.
2. The TUSB320 device acknowledges the address cycle.
3. The master presents the sub-address (I2C register within the TUSB320 device) to be read, consisting of one
byte of data, MSB-first.
4. The TUSB320 device acknowledges the sub-address cycle.
5. The master terminates the read operation by generating a stop condition (P).
NOTE
If no sub-addressing is included for the read procedure, then the reads start at register
offset 00h and continue byte-by-byte through the registers until the I2C master terminates
the read operation. If a I2C address write occurred prior to the read, then the reads start at
the sub-address specified by the address write.
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7.5 Register Maps
Table 6. CSR Registers
ACCESS
TAG
NAME
R
Read
The field can be read by software.
W
Write
The field can be written by software.
MEANING
S
Set
The field can be set by a write of one. Writes of zeros to the field have no effect.
C
Clear
The field can be cleared by a write of one. Writes of zeros to the field have no effect.
U
Update
Hardware can autonomously update this field.
NA
No Access
Not accessible or not applicable.
7.5.1 CSR Registers (address = 0x00 – 0x07)
Figure 4. CSR Registers (address = 0x00 – 0x07)
7
6
5
4
3
2
1
0
DEVICE_ID
R
LEGEND: R/W = Read/Write; R = Read only; -n = value after reset
Table 7. CSR Registers (address = 0x00 – 0x07)
16
Bit
Field
Type
7:0
DEVICE_ID
R
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Description
For the TUSB320 device these fields return a string of ASCII
characters returning TUSB320
Addresses 0x07 - 0x00 = {0x00 0x54 0x55 0x53 0x42 0x33 0x32
0x30}
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7.5.2 CSR Registers (address = 0x08)
Figure 5. CSR Registers (address = 0x08)
7
6
5
4
3
2
1
CURRENT_MODE_ADVERTISE
CURRENT_MODE_DETECT
ACCESSORY_CONNECTED
RW
RU
RU
0
ACTIVE_CABLE_
DETECTION
RU
LEGEND: R/W = Read/Write; R = Read only; -n = value after reset
Table 8. CSR Registers (address = 0x08)
Bit
Field
Type
Reset
Description
These bits are programmed by the application to raise the
current advertisement from default.
00 – Default (500 mA / 900 mA) initial value at startup
7:6
CURRENT_MODE_ADVERTISE
RW
00
01 – Mid (1.5 A)
10 – High (3 A)
11 – Reserved
These bits are set when a UFP determines the Type-C Current
mode.
00 – Default (value at start up)
5:4
CURRENT_MODE_DETECT
RU
00
01 – Medium
10 – Audio Charged through accessory – 500 mA
11 – High
These bits are read by the application to determine if an
accessory was attached.
000 – No accessory attached (default)
001 – Reserved
010 – Reserved
3:1
ACCESSORY_CONNECTED
RU
000
011 – Reserved
100 – Audio accessory
101 – Audio charged thru accessory
110 – Debug accessory when the TUSB320 device is connected
as a DFP.
111 – Debug accessory when the TUSB320 device is connected
as a UFP.
0
ACTIVE_CABLE_DETECTION
RU
0
This flag indicates that an active cable has been plugged into
the Type-C connector. When this field is set, an active cable is
detected.
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7.5.3 CSR Registers (address = 0x09)
Figure 6. CSR Registers (address = 0x09)
7
6
5
4
3
2
1
ATTACHED_STATE
CABLE_DIR
INTERRUPT_STATUS
—
DRP_DUTY_CYCLE
RU
RU
RCU
R
RW
0
DISABLE_UFP_
ACCESSORY
RW
LEGEND: R/W = Read/Write; R = Read only; -n = value after reset
Table 9. CSR Registers (address = 0x09)
Bit
Field
Type
Reset
Description
This is an additional method to communicate attach other than
the ID pin. These bits can be read by the application to
determine what was attached.
7:6
ATTACHED_STATE
RU
00
00 – Not attached (default)
01 – Attached.SRC (DFP)
10 – Attached.SNK (UFP)
11 – Attached to an accessory
Cable orientation. The application can read these bits for cable
orientation information.
5
CABLE_DIR
RU
1
0 – CC1
1 – CC2 (default)
The INT pin is pulled low whenever a CSR with RU in Access
field changes. When a CSR change has occurred this bit should
be held at 1 until the application clears it. A write of 1'b1 is
required to clear this field.
4
INTERRUPT_STATUS
RCU
0
0 – Clear
1 – Interrupt (When INT_N is pulled low, this bit will be 1. )
Note: SW must make sure the INTERRUPT_STATUS has been
cleared to zero. Rewrites to this register are needed for the
INT_N to be correctly asserted for all interrupt events.
3
Reserved
R
0
Reserved
Percentage of time that a DRP advertises DFP during tDRP
00 – 30% (default)
2:1
DRP_DUTY_CYCLE
RW
00
01 – 40%
10 – 50%
11 – 60%
Settings this field will disable UFP accessory support.
0
DISABLE_UFP_ACCESSORY
RW
0
0 – UFP accessory support enabled (Default)
1 – UFP accessory support disabled
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7.5.4 CSR Registers (address = 0x0A)
Figure 7. CSR Registers (address = 0x0A)
7
6
DEBOUNCE
RW
5
4
MODE_SELECT
RW
3
I2C_SOFT_RESET
RSU
2
1
SOURCE_PREF
RW
0
DISABLE_TERM
RW
LEGEND: R/W = Read/Write; R = Read only; -n = value after reset
Table 10. CSR Registers (address = 0x0A)
Bit
Field
Type
Reset
Description
The nominal amount of time the TUSB320 device debounces
the voltages on the CC pins.
00 – 168 ms (default)
7:6
DEBOUNCE
RW
00
01 – 118 ms
10 – 134 ms
11 – 152 ms
This register can be written to set the TUSB320 device mode
operation. The ADDR pin must be set to I2C mode. If the default
is maintained, the TUSB320 device operates according to the
PORT pin levels and modes.
5:4
MODE_SELECT
RW
00
00 – Maintain mode according to PORT pin selection (default)
01 – UFP mode (unattached.SNK)
10 – DFP mode(unattached.SRC)
11 – DRP mode(start from unattached.SNK)
This resets the digital logic. The bit is self-clearing. A write of 1
starts the reset. The following registers can be affected after
setting this bit:
3
CURRENT_MODE_DETECT
I2C_SOFT_RESET
RSU
0
ACTIVE_CABLE_DETECTION
ACCESSORY_CONNECTED
ATTACHED_STATE
CABLE_DIR
This field controls the TUSB320 behavior when configured as a
DRP.
00 – Standard DRP (default)
2:1
SOURCE_PREF
RW
00
01 – DRP will perform Try.SNK.
10 – Reserved.
11 – DRP will perform Try.SRC.
This field will disable the termination on the CC pins and
transition the CC state machine of the TUSB320 device to the
Disable State.
0
DISABLE_TERM
RW
0
0 – Termination enabled according to Port (Default)
1 – Termination disabled and state machine held in Disabled
state.
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7.5.5 CSR Registers (address = 0x45)
Figure 8. CSR Registers (address = 0x45)
7
6
5
—
R
4
3
2
DISABLE_RD_RP
RW
1
0
—
RW
LEGEND: R/W = Read/Write; R = Read only; -n = value after reset
Table 11. CSR Registers (address = 0x45)
Bit
Field
Type
Reset
Description
7:3
Reserved
R
00000
Reserved
DISABLE_RD_RP
RW
0
Reserved
RW
00
When this field is set, Rd and Rp are disabled.
2
0 – Normal operation (default)
1 – Disable Rd and Rp
1:0
For TI internal use only. Do not change default value.
7.5.6 CSR Registers (address = 0xA0)
Figure 9. CSR Registers (address = 0xA0)
7
6
5
4
3
2
1
0
REVISION
R
LEGEND: R/W = Read/Write; R = Read only; -n = value after reset
Table 12. CSR Registers (address = 0xA0)
20
Bit
Field
Type
Reset
Description
7:0
REVISION
R
0x02
Revision of TUSB320. Defaults to 0x02.
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8 Application and Implementation
NOTE
Information in the following applications sections is not part of the TI component
specification, and TI does not warrant its accuracy or completeness. TI’s customers are
responsible for determining suitability of components for their purposes. Customers should
validate and test their design implementation to confirm system functionality.
8.1 Application Information
The TUSB320 device is a Type-C configuration channel logic and port controller. The TUSB320 device can
detect when a Type-C device is attached, what type of device is attached, the orientation of the cable, and power
capabilities (both detection and broadcast). The TUSB320 device can be used in a source application (DFP), in a
sink application (UFP), or a combination source/sink application (DRP).
8.2 Typical Application
8.2.1 DRP in I2C Mode
Figure 10 and Figure 11 show a Type-C configuration for the DRP mode.
Legacy TypeA
Switch
5V
VBUS
VBUS
PMIC
VPH
VDD
CC1
CC/Mode
Controller
PORT
Processor
CC2
DP
GPIOs
VBUS
VDD
CC/Mode
Controller
CC2
DP
GPIOs
Processor
DM
I2C
CC1
ID
DM
I2C
TUSB320
USB TypeC Port
VBUS
2.7 - 5 V
PORT
USB TypeC Port
ID
TUSB320
Copyright © 2016, Texas Instruments Incorporated
Copyright © 2016, Texas Instruments Incorporated
Figure 10. TUSB320 in DRP Mode Supporting Default
Implementation
Figure 11. TUSB320 in DRP Mode Supporting Advanced
Power Delivery
Figure 12 shows the TUSB320 device configured as a DRP in I2C mode.
USB VBUS Switch
(optional BC 1.2 support for legacy)
SCL
SDA
DM
DP
DM_OUT
DM_IN
DP_OUT
DP_IN
VIN
EN
VOUT
System VBUS
PS_EN
FAULT#
PS_FAULT#
VBUS
I2C I/O
1.8V or 3.3V
USB2
OTG
and
PMIC
VBAT
150uF
DM
DP
100nF
VBUS
200K
200K
900K
A1
VBUS_DET
PORT
INT_N/OUT3
SCL/OUT2
SDA
SDA/OUT1
CC2
EN_N
ID
SCL
ADDR
ID
CC1
TUSB320LA
CC1
B11
B10
A4
B9
A5
B8
A6
B7
A7
B6
CC2
GND
INT#
B12
A2
A3
1uF
A8
B5
A9
B4
A10
B3
A11
B2
A12
B1
Type C
Receptacle
4.7K
VDD
4.7K
Figure 12. DRP in I2C Mode Schematic
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Typical Application (continued)
8.2.1.1 Design Requirements
For this design example, use the parameters listed in Table 13:
Table 13. Design Requirements for DRP in I2C Mode
DESIGN PARAMETER
VALUE
VDD (2.75 V to 5 V)
VBAT (less than 5 V)
Mode (I2C or GPIO)
I2C: ADDR pin must be pulled down or pulled up
I2C address (0x67 or 0x47)
0x47: ADDR pin must be pulled low or tied to GND
Type-C port type (UFP, DFP, or DRP)
DRP: PORT pin is NC
Shutdown support
No
8.2.1.2 Detailed Design Procedure
The TUSB320 device supports a VDD in the range of 2.75 V to 5 V. In this particular use case, VBAT which must
be in the required VDD range is connected to the VDD pin. A 100-nF capacitor is placed near VDD.
The TUSB320 device is placed into I2C mode by either pulling the ADDR pin high or low. In this case, the ADDR
pin is tied to GND which results in a I2C address of 0x47. The SDA and SCL must be pulled up to either 1.8 V or
3.3 V. When pulled up to 3.3 V, the VDD supply must be at least 3 V to keep from back-driving the I2C interface.
The TUSB320LA device can enter shutdown mode by pulling the EN_N pin high, which puts the TUSB320LA
device into a low power state. In this case, external control of the EN_N pin is not implemented and therefore the
EN_N pin is tied to GND. The TUSB320HA device can enter shutdown mode by pulling the EN pin low, which
puts the TUSB320HA device into a low power state. In this case, external control of the EN pin is not
implemented and therefore the EN pin is tied to 1.8 V or 3.3 V.
The INT_N/OUT3 pin is used to notify the PMIC when a change in the TUSB320 I2C registers occurs. This pin is
an open drain output and requires an external pullup resistor. The pin should be pulled up to VDD using a 200-kΩ
resistor.
The ID pin is used to indicate when a connection has occurred if the TUSB320 device is a DFP while configured
for DRP. An OTG USB controller can use this pin to determine when to operate as a USB Host or USB Device.
When this pin is driven low, the OTG USB controller functions as a host and then enables VBUS. The Type-C
standard requires that a DFP not enable VBUS until the DFP is in the Attached.SRC state. If the ID pin is not low
but VBUS is detected, then OTG USB controller functions as a device. The ID pin is open drain output and
requires an external pullup resistor. THe ID pin should be pulled up to VDD using a 200-kΩ resistor.
The Type-C port mode is determined by the state of the PORT pin. When the PORT pin is not connected, the
TUSB320 device is in DRP mode. The Type-C port mode can also be controlled by the MODE_SELECT register
through the I2C interface.
The VBUS_DET pin must be connected through a 900-kΩ resistor to VBUS on the Type-C that is connected. This
large resistor is required to protect the TUSB320 device from large VBUS voltage that is possible in present day
systems. This resistor along with internal pulldown keeps the voltage observed by the TUSB320 device in the
recommended range.
The USB2 specification requires the bulk capacitance on VBUS based on UFP or DFP. When operating the
TUSB320 device in a DRP mode, it alternates between UFP and DFP. If the TUSB320 device connects as a
UFP, the large bulk capacitance must be removed.
Table 14. USB2 Bulk Capacitance Requirements
22
PORT CONFIGURATION
MIN
Downstream facing port (DFP)
120
Upstream facing port (UFP)
1
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MAX
UNIT
µF
10
µF
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8.2.1.3 Application Curves
Figure 13. Application Curve for DRP in I2C Mode
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8.2.2 DFP in I2C Mode
Figure 14 and Figure 15 show a Type-C configuration for the DFP mode.
Legacy TypeA
Switch
5V
VBUS
VBUS
PMIC
VDD
PORT
VPH
VBUS
VDD
2.7 - 5 V
VDD
CC1
PORT
CC/Mode
Controller
CC2
DP
GPIOs
Processor
VBUS
VDD
CC1
CC/Mode
Controller
ID
DM
I2C
USB TypeC Port
USB TypeC Port
ID
CC2
DP
GPIOs
Processor
DM
I2C
TUSB320
TUSB320
Copyright © 2016, Texas Instruments Incorporated
Copyright © 2016, Texas Instruments Incorporated
Figure 14. TUSB320 in DFP Mode Supporting Default
Implementation
Figure 15. TUSB320 in DFP Mode Supporting Advanced
Power Delivery
Figure 16 shows the TUSB320 device configured as a DFP in I2C mode.
USB VBUS Switch
(optional BC 1.2 support for legacy)
SCL
SDA
DM
DP
DM_OUT
DM_IN
DP_OUT
DP_IN
VIN
EN
VOUT
System VBUS
PS_EN
FAULT#
PS_FAULT#
VBUS
I2C I/O
1.8V or 3.3V
USB2
OTG
and
PMIC
VDD_5V
150uF
DM
DP
100nF
4.7K
200K
200K
900K
VDD
4.7K
200K
VBUS_DET
PORT
INT_N/OUT3
TUSB320LA
ID
SCL
SCL/OUT2
SDA
SDA/OUT1
EN_N
CC2
ADDR
ID
CC1
CC1
B12
A2
B11
A3
B10
A4
B9
A5
B8
A6
B7
A7
B6
CC2
GND
INT#
A1
A8
B5
A9
B4
A10
B3
A11
B2
A12
B1
Type C
Receptacle
VBUS
Figure 16. DFP in I2C Mode Schematic
8.2.2.1 Design Requirements
For this design example, use the parameters listed in Table 15:
Table 15. Design Requirements for DFP in I2C Mode
DESIGN PARAMETER
VALUE
VDD (2.75 V to 5 V)
2
24
5V
2
Mode (I C or GPIO)
I C: ADDR pin must be pulled down or pulled up
I2C address (0x67 or 0x47)
0x47: ADDR pin must be pulled low or tied to GND
Type-C port type (UFP, DFP, or DRP)
DFP: PORT pin is pulled up
Shutdown support
No
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8.2.2.2 Detailed Design Procedure
The TUSB320 device supports a VDD in the range of 2.75 V to 5 V. In this particular case, VDD is set to 5 V. A
100-nF capacitor is placed near VDD.
The TUSB320 device is placed into I2C mode by either pulling the ADDR pin high or low. In this particular case,
the ADDR pin is tied to GND which results in a I2C address of 0x47. The SDA and SCL must be pulled up to
either 1.8 V or 3.3 V. When pulled up to 3.3 V, the VDD supply must be at least 3 V to keep from back-driving the
I2C interface.
The TUSB320LA device can enter shutdown mode by pulling the EN_N pin high, which puts the TUSB320LA
device into a low power state. In this case, external control of the EN_N pin is not implemented and therefore the
EN_N pin is tied to GND. The TUSB320HA device can enter shutdown mode by pulling the EN pin low, which
puts the TUSB320HA device into a low power state. In this case, external control of the EN pin is not
implemented and therefore the EN pin is tied to 1.8 V or 3.3 V.
The INT_N/OUT3 pin is used to notify the PMIC when a change in the TUSB320 I2C registers occurs. This pin is
an open drain output and requires an external pullup resistor. The pin should be pulled up to VDD using a 200-kΩ
resistor.
The Type-C port mode is determined by the state of the PORT pin. When the PORT pin is pulled high, the
TUSB320 device is in DFP mode. The Type-C port mode can also be controlled by the MODE_SELECT register
through the I2C interface.
The VBUS_DET pin must be connected through a 900-kΩ resistor to VBUS on the Type-C that is connected. This
large resistor is required to protect the TUSB320 device from large VBUS voltage that is possible in present day
systems. This resistor along with internal pulldown keeps the voltage observed by the TUSB320 device in the
recommended range.
The USB2 specification requires the bulk capacitance on VBUS based on UFP or DFP. When operating the
TUSB320 device in a DFP mode, a bulk capacitance of at least 120 µF is required. In this particular case, a 150µF capacitor was chosen.
8.2.2.3 Application Curves
Figure 17. Application Curve for DFP in I2C Mode
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8.2.3 UFP in I2C Mode
Figure 18 and Figure 19 show a Type-C configuration for the UFP mode.
VBUS
5V
VBUS
PMIC
VPH
VDD
CC1
CC/Mode
Controller
PORT
Processor
CC2
GPIOs
DP
I2C
DM
VBUS
CC1
VDD
CC/Mode
Controller
ID
CC2
DP
GPIOs
Processor
DM
I2C
GND
USB TypeC Port
VBUS
2.7 - 5 V
PORT
USB TypeC Port
ID
TUSB320
TUSB320
Copyright © 2016, Texas Instruments Incorporated
Copyright © 2016, Texas Instruments Incorporated
Figure 18. TUSB320 in UFP Mode Supporting Default
Implementation
Figure 19. TUSB320 in UFP Mode Supporting Advanced
Power Delivery
Figure 20 shows the TUSB320 device configured as a UFP in I2C mode.
Optional power
TUSB320 with VBUS
less than 5.5V
DM
DP
VBUS
D1
I2C I/O
1.8V or 3.3V
VDD_5V
USB2
Device
and PMIC
DM
DP
100nF
4.7K
200K
200K
900K
VDD
4.7K
VBUS_DET
PORT
INT_N/OUT3
CC1
TUSB320LA
ID
SCL/OUT2
SDA
SDA/OUT1
EN_N
SCL
ADDR
CC2
CC1
B12
A2
B11
A3
B10
A4
B9
A5
B8
A6
B7
A7
B6
CC2
GND
INT#
A1
1uF
A8
B5
A9
B4
A10
B3
A11
B2
A12
B1
Type C
Receptacle
VBUS
4.7K
Figure 20. UFP in I2C Mode Schematic
8.2.3.1 Design Requirements
For this design example, use the parameters listed in Table 16:
Table 16. Design Requirements for UFP in I2C Mode
DESIGN PARAMETER
VALUE
VDD (2.75 V to 5 V)
2
26
5V
2
Mode (I C or GPIO)
I C: ADDR pin must be pulled down or pulled up
I2C address (0x67 or 0x47)
0x47: ADDR pin must be pulled low or tied to GND
Type-C port type (UFP, DFP, or DRP)
UFP: PORT pin is pulled down
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Table 16. Design Requirements for UFP in I2C Mode (continued)
DESIGN PARAMETER
VALUE
Shutdown support
No
8.2.3.2 Detailed Design Procedure
The TUSB320 device supports a VDD in the range of 2.75 V to 5 V. In this particular case, VDD is set to 5 V. A
100-nF capacitor is placed near VDD. If VBUS is guaranteed to be less than 5.5 V, powering the TUSB320 device
through a diode can be implemented.
The TUSB320 device is placed into I2C mode by either pulling the ADDR pin high or low. In this case, the ADDR
pin is tied to GND which results in a I2C address of 0x47. The SDA and SCL must be pulled up to either 1.8 V or
3.3 V. When pulled up to 3.3 V, the VDD supply must be at least 3 V to keep from back-driving the I2C interface.
The TUSB320LA device can enter shutdown mode by pulling the EN_N pin high, which puts the TUSB320LA
device into a low power state. In this case, external control of the EN_N pin is not implemented and therefore the
EN_N pin is tied to GND. The TUSB320HA device can enter shutdown mode by pulling the EN pin low, which
puts the TUSB320HA device into a low power state. In this case, external control of the EN pin is not
implemented and therefore the EN pin is tied to 1.8 V or 3.3 V.
The INT_N/OUT3 pin is used to notify the PMIC when a change in the TUSB320 I2C registers occurs. This pin is
an open drain output and requires an external pullup resistor. The pin should be pulled up to VDD using a 200-kΩ
resistor.
The Type-C port mode is determined by the state of the PORT pin. When the PORT pin is pulled low, the
TUSB320 device is in UFP mode. The Type-C port mode can also be controlled by the MODE_SELECT register
through the I2C interface.
The VBUS_DET pin must be connected through a 900-kΩ resistor to VBUS on the Type-C that is connected. This
large resistor is required to protect the TUSB320 device from large VBUS voltage that is possible in present day
systems. This resistor along with internal pulldown keeps the voltage observed by the TUSB320 device in the
recommended range.
The USB2 specification requires the bulk capacitance on VBUS based on UFP or DFP. When operating the
TUSB320 device in a UFP mode, a bulk capacitance between 1 µF to 10 µF is required. In this particular case, a
1-µF capacitor was chosen.
8.2.3.3 Application Curves
Figure 21. Application Curve for UFP in I2C Mode
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8.3 Initialization Setup
8.3.1 TUSB320LA Initialization Procedure
1. System is powered off (device has no VDD). The TUSB320LA device is configured internally in UFP mode
with Rds on CC pins (dead battery).
2. VDD ramps – POR circuit. VDD must ramp within 25 ms or less. IO pull-up power rail (i.e. pull up on ID, INT,
SCL, SDA, ADDR, PORT) must ramp with VDD or lag after VDD.
3. I2C supply ramps up.
4. The TUSB320LA device enters unattached mode and determines the voltage level from the PORT pin. This
determines the mode in which the TUSB320LA device operates (DFP, UFP, DRP).
5. The TUSB320LA device monitors the CC pins as a DFP and VBUS for attach as a UFP.
6. The TUSB320LA device enters active mode when attach has been successfully detected.
8.3.2 TUSB320HA Initialization Procedure
1. System is powered off (device has no VDD). The TUSB320HA device is configured internally in UFP mode
with Rds on CC pins (dead battery).
2. VDD ramps – POR circuit. VDD must ramp within 25 ms or less. IO pull-up power rail (i.e. pull up on ID, INT,
SCL, SDA, ADDR, PORT) must ramp with VDD or lag after VDD.
3. I2C supply ramps up.
4. The TUSB320HA device enters unattached mode and determines the voltage level from the PORT pin. This
determines the mode in which the TUSB320HA device operates (DFP, UFP, DRP).
5. The TUSB320HA device monitors the CC pins as a DFP and VBUS for attach as a UFP.
6. The TUSB320HA device enters active mode when attach has been successfully detected.
9 Power Supply Recommendations
The TUSB320 device has a wide power supply range from 2.7 to 5 V. The TUSB320 device can be run off of a
system power such as a battery.
28
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10 Layout
10.1 Layout Guidelines
1. An extra trace (or stub) is created when connecting between more than two points. A trace connecting pin A6
to pin B6 will create a stub because the trace also has to go to the USB Host. Ensure that:
– A stub created by short on pin A6 (DP) and pin B6 (DP) at Type-C receptacle does not exceed 3.5 mm.
– A stub created by short on pin A7 (DM) and pin B7 (DM) at Type-C receptacle does not exceed 3.5 mm.
2. A 100-nF capacitor should be placed as close as possible to the TUSB320 VDD pin.
10.2 Layout Example
SCL/OUT2
Figure 22. TUSB320 Layout
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11 Device and Documentation Support
11.1 Related Links
The table below lists quick access links. Categories include technical documents, support and community
resources, tools and software, and quick access to sample or buy.
Table 17. Related Links
PARTS
PRODUCT FOLDER
SAMPLE & BUY
TECHNICAL
DOCUMENTS
TOOLS &
SOFTWARE
SUPPORT &
COMMUNITY
TUSB320LAI
Click here
Click here
Click here
Click here
Click here
TUSB320HAI
Click here
Click here
Click here
Click here
Click here
11.2 Receiving Notification of Documentation Updates
To receive notification of documentation updates, navigate to the device product folder on ti.com. In the upper
right corner, click on Alert me to register and receive a weekly digest of any product information that has
changed. For change details, review the revision history included in any revised document.
11.3 Community Resources
The following links connect to TI community resources. Linked contents are provided "AS IS" by the respective
contributors. They do not constitute TI specifications and do not necessarily reflect TI's views; see TI's Terms of
Use.
TI E2E™ Online Community TI's Engineer-to-Engineer (E2E) Community. Created to foster collaboration
among engineers. At e2e.ti.com, you can ask questions, share knowledge, explore ideas and help
solve problems with fellow engineers.
Design Support TI's Design Support Quickly find helpful E2E forums along with design support tools and
contact information for technical support.
11.4 Trademarks
E2E is a trademark of Texas Instruments.
USB Type-C is a trademark of USB Implementers Forum.
All other trademarks are the property of their respective owners.
11.5 Electrostatic Discharge Caution
These devices have limited built-in ESD protection. The leads should be shorted together or the device placed in conductive foam
during storage or handling to prevent electrostatic damage to the MOS gates.
11.6 Glossary
SLYZ022 — TI Glossary.
This glossary lists and explains terms, acronyms, and definitions.
12 Mechanical, Packaging, and Orderable Information
The following pages include mechanical, packaging, and orderable information. This information is the most
current data available for the designated devices. This data is subject to change without notice and revision of
this document. For browser-based versions of this data sheet, refer to the left-hand navigation.
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PACKAGE OPTION ADDENDUM
www.ti.com
5-Apr-2017
PACKAGING INFORMATION
Orderable Device
Status
(1)
Package Type Package Pins Package
Drawing
Qty
Eco Plan
Lead/Ball Finish
MSL Peak Temp
(2)
(6)
(3)
Op Temp (°C)
Device Marking
(4/5)
TUSB320HAIRWBR
ACTIVE
X2QFN
RWB
12
3000
Green (RoHS
& no Sb/Br)
CU NIPDAU
Level-2-260C-1 YEAR
-40 to 85
HA
TUSB320LAIRWBR
ACTIVE
X2QFN
RWB
12
3000
Green (RoHS
& no Sb/Br)
CU NIPDAU
Level-2-260C-1 YEAR
-40 to 85
LA
(1)
The marketing status values are defined as follows:
ACTIVE: Product device recommended for new designs.
LIFEBUY: TI has announced that the device will be discontinued, and a lifetime-buy period is in effect.
NRND: Not recommended for new designs. Device is in production to support existing customers, but TI does not recommend using this part in a new design.
PREVIEW: Device has been announced but is not in production. Samples may or may not be available.
OBSOLETE: TI has discontinued the production of the device.
(2)
Eco Plan - The planned eco-friendly classification: Pb-Free (RoHS), Pb-Free (RoHS Exempt), or Green (RoHS & no Sb/Br) - please check http://www.ti.com/productcontent for the latest availability
information and additional product content details.
TBD: The Pb-Free/Green conversion plan has not been defined.
Pb-Free (RoHS): TI's terms "Lead-Free" or "Pb-Free" mean semiconductor products that are compatible with the current RoHS requirements for all 6 substances, including the requirement that
lead not exceed 0.1% by weight in homogeneous materials. Where designed to be soldered at high temperatures, TI Pb-Free products are suitable for use in specified lead-free processes.
Pb-Free (RoHS Exempt): This component has a RoHS exemption for either 1) lead-based flip-chip solder bumps used between the die and package, or 2) lead-based die adhesive used between
the die and leadframe. The component is otherwise considered Pb-Free (RoHS compatible) as defined above.
Green (RoHS & no Sb/Br): TI defines "Green" to mean Pb-Free (RoHS compatible), and free of Bromine (Br) and Antimony (Sb) based flame retardants (Br or Sb do not exceed 0.1% by weight
in homogeneous material)
(3)
MSL, Peak Temp. - The Moisture Sensitivity Level rating according to the JEDEC industry standard classifications, and peak solder temperature.
(4)
There may be additional marking, which relates to the logo, the lot trace code information, or the environmental category on the device.
(5)
Multiple Device Markings will be inside parentheses. Only one Device Marking contained in parentheses and separated by a "~" will appear on a device. If a line is indented then it is a continuation
of the previous line and the two combined represent the entire Device Marking for that device.
(6)
Lead/Ball Finish - Orderable Devices may have multiple material finish options. Finish options are separated by a vertical ruled line. Lead/Ball Finish values may wrap to two lines if the finish
value exceeds the maximum column width.
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provided by third parties, and makes no representation or warranty as to the accuracy of such information. Efforts are underway to better integrate information from third parties. TI has taken and
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Addendum-Page 1
Samples
PACKAGE OPTION ADDENDUM
www.ti.com
5-Apr-2017
In no event shall TI's liability arising out of such information exceed the total purchase price of the TI part(s) at issue in this document sold by TI to Customer on an annual basis.
Addendum-Page 2
PACKAGE MATERIALS INFORMATION
www.ti.com
3-Aug-2017
TAPE AND REEL INFORMATION
*All dimensions are nominal
Device
Package Package Pins
Type Drawing
SPQ
Reel
Reel
A0
Diameter Width (mm)
(mm) W1 (mm)
B0
(mm)
K0
(mm)
P1
(mm)
W
Pin1
(mm) Quadrant
TUSB320HAIRWBR
X2QFN
RWB
12
3000
180.0
8.4
1.8
1.8
0.61
4.0
8.0
Q2
TUSB320LAIRWBR
X2QFN
RWB
12
3000
180.0
8.4
1.8
1.8
0.61
4.0
8.0
Q2
Pack Materials-Page 1
PACKAGE MATERIALS INFORMATION
www.ti.com
3-Aug-2017
*All dimensions are nominal
Device
Package Type
Package Drawing
Pins
SPQ
Length (mm)
Width (mm)
Height (mm)
TUSB320HAIRWBR
X2QFN
RWB
12
3000
195.0
200.0
45.0
TUSB320LAIRWBR
X2QFN
RWB
12
3000
195.0
200.0
45.0
Pack Materials-Page 2
PACKAGE OUTLINE
RWB0012A
X2QFN - 0.4 mm max height
SCALE 6.500
PLASTIC QUAD FLATPACK - NO LEAD
1.65
1.55
B
A
PIN 1 INDEX AREA
1.65
1.55
C
0.4 MAX
SEATING PLANE
0.05 C
2X 1.2
SYMM
3
6
2
7
SYMM
2X
0.4
1
0.6
0.4
8X
8
12
4X
0.05
0.00
6X 0.4
(0.13)
TYP
0.4
0.2
9
12X
0.25
0.15
0.07
0.05
C B A
C
4221631/B 07/2017
NOTES:
1. All linear dimensions are in millimeters. Any dimensions in parenthesis are for reference only. Dimensioning and tolerancing
per ASME Y14.5M.
2. This drawing is subject to change without notice.
www.ti.com
EXAMPLE BOARD LAYOUT
RWB0012A
X2QFN - 0.4 mm max height
PLASTIC QUAD FLATPACK - NO LEAD
(1.3)
6X (0.4)
9
12
4X (0.7)
1
8
SYMM
2X (0.4)
(1.5)
7
2
8X (0.5)
3
6
SYMM
12X (0.2)
(R0.05) TYP
LAND PATTERN EXAMPLE
EXPOSED METAL SHOWN
SCALE:30X
0.05 MAX
ALL AROUND
0.05 MIN
ALL AROUND
METAL
SOLDER MASK
OPENING
EXPOSED METAL
EXPOSED METAL
SOLDER MASK
OPENING
NON SOLDER MASK
DEFINED
(PREFERRED)
METAL UNDER
SOLDER MASK
SOLDER MASK
DEFINED
SOLDER MASK DETAILS
4221631/B 07/2017
NOTES: (continued)
3. For more information, see Texas Instruments literature number SLUA271 (www.ti.com/lit/slua271).
www.ti.com
EXAMPLE STENCIL DESIGN
RWB0012A
X2QFN - 0.4 mm max height
PLASTIC QUAD FLATPACK - NO LEAD
(1.3)
6X (0.4)
9
12
4X (0.67)
1
8
SYMM
2X (0.4)
(1.5)
2
7
8X
METAL
8X (0.5)
6
3
12X (0.2)
SYMM
(R0.05) TYP
SOLDER PASTE EXAMPLE
BASED ON 0.1 mm THICK STENCIL
PADS 1,2,7 & 8
96% PRINTED SOLDER COVERAGE BY AREA
SCALE:50X
4221631/B 07/2017
NOTES: (continued)
4. Laser cutting apertures with trapezoidal walls and rounded corners may offer better paste release. IPC-7525 may have alternate
design recommendations.
www.ti.com
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