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Texas Instruments TPS2549-Q1 Production Silicon Change List Application notes
Application Report
SLVA779 – July 2016
TPS2549-Q1 Production Silicon Change List
Tina Liang
ABSTRACT
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.
Important
TI has fixed the CDP/SDP auto-switch bug in all TPS2549-Q1 devices manufactured after Feb 29th,
2016.
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.
+----------+
!O
!
! 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
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TPS2549-Q1 Production Silicon Change List
Copyright © 2016, Texas Instruments Incorporated
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www.ti.com
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
2
TPS2549-Q1 Production Silicon Change List
Copyright © 2016, Texas Instruments Incorporated
SLVA779 – July 2016
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www.ti.com
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.
Resolution:
TI has fixed the CDP/SDP auto-switch bug in silicon, see the first page of this change notification for
details.
Impacted Device:
Device
Package
Top-Side Marking
TPS2549-Q1
QFN16
2549Q
SLVA779 – July 2016
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TPS2549-Q1 Production Silicon Change List
Copyright © 2016, Texas Instruments Incorporated
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