Texas Instruments | TPS2549-Q1 Production Silicon Change List | Application notes | Texas Instruments TPS2549-Q1 Production Silicon Change List Application notes

Texas Instruments TPS2549-Q1 Production Silicon Change List Application notes
Application Report
SLVA779 – July 2016
TPS2549-Q1 Production Silicon Change List
Tina Liang
TI discovered a bug with TPS2549-Q1 production silicon manufactured before March 1st, 2016. If you are
using a TPS2549-Q1 device manufactured after March 1st, 2016, (directions follow on how to identify)
please discard this change notice.
The bug is related to the CDP/SDP auto-switch function and is triggered only when the device is in CDP
mode. While in CDP mode, the bug is triggered when the TPS2549-Q1 host port is connected to a
compliant USB 2.0 device and high-speed data communication handshake is taking place.
The bug has no affect in systems where TPS2549-Q1 is configured in SDP/SDP1, DCP/DCP1, or Client
mode (visit www.ti.com to download the latest version of the device data sheet). Note that this change
notification only applies to TPS2549-Q1.
TI has fixed the CDP/SDP auto-switch bug in all TPS2549-Q1 devices manufactured after Feb 29th,
The CDP/SDP auto-switch bug only affects TPS2549-Q1 parts that were manufactured before March 1st,
2016. Customers can easily verify if the part they are using is affected by this bug, by inspecting the topside marking on the part.
! 2549Q
! TI 63* !
! ****
Parts that have the bug fixed will have date code 63* or higher (that is, 64, 6A, 71, and so forth). In
the highlighted alphanumeric character, the first character represents the year of manufacture, hence 6 is
year 2016 and a 7 would be year 2017 and so on. The second character is a HEX for the month
(1=January, 2=February, … , A=October, B=November, and so forth).
When in doubt, contact your local TI sales office. Contact your local TI sales office if you have a device
with a date code prior to 63*, that is, 62* or earlier.
All trademarks are the property of their respective owners.
SLVA779 – July 2016
Submit Documentation Feedback
TPS2549-Q1 Production Silicon Change List
Copyright © 2016, Texas Instruments Incorporated
Silicon Bug Description: CDP/SDP Auto-Switch Function is Incorrectly Occurring in CDP Mode
Description: Refer to the device truth table (Table 1) and Section 8.3.6 in the TPS2549-Q1 data sheet
(SLUSCE3), there is a CDP/SDP auto-switch function in CDP mode to support some popular phones that
do not comply with the BC1.2 specification because they fail to establish a data communication in CDP
mode. The CDP/SDP scheme performs the following:
1. The TPS2549-Q1 determines when a noncompliant phone has wrongly classified a CDP port as DCP
port and has not made a data connection
2. The TPS2549-Q1 switches to SDP mode automatically after a VBUS discharge event so that the noncompliant phone can see a connection to SDP and make data connection
3. The TPS2549-Q1 switches back to CDP mode automatically without VBUS discharge so that the noncompliant phone is not interrupted while the port is ready in CDP mode, if a new device is attached.
The CDP/SDP auto-switch function in TPS2549-Q1 is meant to occur when a portable device never
signals connection and enumerates. However, the silicon bug discovered makes the CDP/SDP autoswitch function incorrectly occur after a portable device has successfully established data communication
as Table 1 shows.
Table 1. Truth Table
TPS2549-Q1 Production Silicon Change List
Copyright © 2016, Texas Instruments Incorporated
SLVA779 – July 2016
Submit Documentation Feedback
Figure 1. CDP/SDP Auto-Switch Occurs Incorrectly
Application Impact:
The CDP/SDP auto-switch bug will disable fast charging when the TPS2549-Q1 is configured in CDP
mode. The bug prevents the portable device from fast charge as the TPS2549-Q1 switches to SDP mode
and may also result in data communication loss due to VBUS discharge as shown in Figure 1.
Work Around:
Unfortunately there is no work around where fast charge and data communication are needed in same
mode. Use DCP mode to fast charge the device if data communication is not needed, or SDP mode for
data communication if fast charging is not needed.
TI has fixed the CDP/SDP auto-switch bug in silicon, see the first page of this change notification for
Impacted Device:
Top-Side Marking
SLVA779 – July 2016
Submit Documentation Feedback
TPS2549-Q1 Production Silicon Change List
Copyright © 2016, Texas Instruments Incorporated
Texas Instruments Incorporated and its subsidiaries (TI) reserve the right to make corrections, enhancements, improvements and other
changes to its semiconductor products and services per JESD46, latest issue, and to discontinue any product or service per JESD48, latest
issue. Buyers should obtain the latest relevant information before placing orders and should verify that such information is current and
complete. All semiconductor products (also referred to herein as “components”) are sold subject to TI’s terms and conditions of sale
supplied at the time of order acknowledgment.
TI warrants performance of its components to the specifications applicable at the time of sale, in accordance with the warranty in TI’s terms
and conditions of sale of semiconductor products. Testing and other quality control techniques are used to the extent TI deems necessary
to support this warranty. Except where mandated by applicable law, testing of all parameters of each component is not necessarily
TI assumes no liability for applications assistance or the design of Buyers’ products. Buyers are responsible for their products and
applications using TI components. To minimize the risks associated with Buyers’ products and applications, Buyers should provide
adequate design and operating safeguards.
TI does not warrant or represent that any license, either express or implied, is granted under any patent right, copyright, mask work right, or
other intellectual property right relating to any combination, machine, or process in which TI components or services are used. Information
published by TI regarding third-party products or services does not constitute a license to use such products or services or a warranty or
endorsement thereof. Use of such information may require a license from a third party under the patents or other intellectual property of the
third party, or a license from TI under the patents or other intellectual property of TI.
Reproduction of significant portions of TI information in TI data books or data sheets is permissible only if reproduction is without alteration
and is accompanied by all associated warranties, conditions, limitations, and notices. TI is not responsible or liable for such altered
documentation. Information of third parties may be subject to additional restrictions.
Resale of TI components or services with statements different from or beyond the parameters stated by TI for that component or service
voids all express and any implied warranties for the associated TI component or service and is an unfair and deceptive business practice.
TI is not responsible or liable for any such statements.
Buyer acknowledges and agrees that it is solely responsible for compliance with all legal, regulatory and safety-related requirements
concerning its products, and any use of TI components in its applications, notwithstanding any applications-related information or support
that may be provided by TI. Buyer represents and agrees that it has all the necessary expertise to create and implement safeguards which
anticipate dangerous consequences of failures, monitor failures and their consequences, lessen the likelihood of failures that might cause
harm and take appropriate remedial actions. Buyer will fully indemnify TI and its representatives against any damages arising out of the use
of any TI components in safety-critical applications.
In some cases, TI components may be promoted specifically to facilitate safety-related applications. With such components, TI’s goal is to
help enable customers to design and create their own end-product solutions that meet applicable functional safety standards and
requirements. Nonetheless, such components are subject to these terms.
No TI components are authorized for use in FDA Class III (or similar life-critical medical equipment) unless authorized officers of the parties
have executed a special agreement specifically governing such use.
Only those TI components which TI has specifically designated as military grade or “enhanced plastic” are designed and intended for use in
military/aerospace applications or environments. Buyer acknowledges and agrees that any military or aerospace use of TI components
which have not been so designated is solely at the Buyer's risk, and that Buyer is solely responsible for compliance with all legal and
regulatory requirements in connection with such use.
TI has specifically designated certain components as meeting ISO/TS16949 requirements, mainly for automotive use. In any case of use of
non-designated products, TI will not be responsible for any failure to meet ISO/TS16949.
Automotive and Transportation
Communications and Telecom
Data Converters
Computers and Peripherals
DLP® Products
Consumer Electronics
Energy and Lighting
Clocks and Timers
Power Mgmt
Space, Avionics and Defense
Video and Imaging
OMAP Applications Processors
TI E2E Community
Wireless Connectivity
Mailing Address: Texas Instruments, Post Office Box 655303, Dallas, Texas 75265
Copyright © 2016, Texas Instruments Incorporated
Was this manual useful for you? yes no
Thank you for your participation!

* Your assessment is very important for improving the work of artificial intelligence, which forms the content of this project

Download PDF