Texas Instruments | bq27545-G1 to bq27546-G1 Change List | Application notes | Texas Instruments bq27545-G1 to bq27546-G1 Change List Application notes

Texas Instruments bq27545-G1 to bq27546-G1 Change List Application notes
Application Report
SLUA757 – August 2015
bq27545-G1 to bq27546-G1 Change List
This document describes the changes made from bq27545-G1 to bq27546-G1. The latest ordering
information and data sheet is available on the TI Web site.
bq27545-G1 ICs cannot be upgraded with bq27546-G1 firmware.
bq27546-G1 includes a new ROM version to enable updated firmware features.
Although the bq27545-G1 reports FW version 2.24 and the bq27546-G1 reports FW
version 2.01, bq27546-G1 is from a new code branch and is therefore more recent.
The bq27546-G1 firmware version 2.01 enables several feature additions and performance improvements.
The following newly released orderable part numbers are shipped pre-programmed with this new version
of firmware:
• bbq27546YZFR-G1
• bq27546YZFT-G1
To use the bq27546-G1, download the latest version of Battery Management Studio (bqStudio) evaluation
software from ti.com.
Due to a ROM update, existing bq27545 ICs and EVMs cannot be upgraded to parity with bq27546.
NOTE: If a golden image created for any version of bq27545-G1 is loaded into a bq27546-G1 IC,
the IC will become non-functional and must be replaced. The best practice is to generate a
new golden image (DFI file) for bq27546-G1. If a learning cycle for an existing cell or battery
has already been performed on bq27545-G1, it is acceptable to program the same chemID
and then copy the learned Qmax and Ra values to a new bq27546 golden file.
Change Details
Table 1. Change Details
ROM version update
Older ROM version
Newer ROM version
bq27545 ICs cannot
be upgraded with
bq27546 firmware.
Support Fast Qmax
Fast Qmax feature is not present.
Allows the use of the FastQmax algorithm feature to
increase the likelihood of Qmax updates for
applications where periodic relaxations may not be
New enable bit added to Pack Configuration C:
New Feature
Support Battery Trip Point
BTP is not supported.
Provides full BTP compliance for customers designing
Win8 products.
New bit added to Pack Configuration C:
New Feature
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Change Details
Table 1. Change Details (continued)
TURBO mode is not supported.
Provides useful current reporting to inform the system
when to throttle back consumption to avoid brownout.
Enables dynamic or load scaling of system current.
New Feature
Add Trace/Downstream
Resistance Feature
Feature is not supported.
Allows applications with non-trivial parasitic trace
resistances between cell and PACK+/– nodes, as well
as between PACK+/– and system +/– nodes. This
enables the gauge to better predict when Terminate
Voltage will be reached on the system side where
power is used, rather than on the cell side.
New Feature
Filtered remaining capacity
reporting options
Filtered RemCap and SOC must
start decreasing immediately on
discharge, and increase
immediately on start of charge,
even if over-charged (>100%) or
over-discharged (below empty). In
these situations, the Unfiltered
values stay at 100% and 0% to
reflect the true state.
New options are added to maintain legacy filtered
behavior or else allow Filtered SOC and RemCap to
hold at 100% and 0% until overcharged and overdischarged conditions pass.
New bits added to Pack Config:
Feature Change
SOC reporting improvement
Gauge is allowed to report 100%
before charge termination detection
or 0% before Terminate Voltage is
Gauge can be configured to hold SOC at 99% until
Feature Change
charge termination conditions are detected, and at 0%
until Terminate Voltage is reached.
New enable bits added to Pack Config:
Add time-based or instant
synchronization to SOC
smoothing during
Filtered and Unfiltered capacity
values will necessarily diverge as
conditions change. They can only
be synchronized at full or empty
points, unless RelaxRCJumpOK is
enabled and a temperature change
causes a jump.
Option is added to allow convergence of Filtered
values to match Unfiltered values either over time or
instantly during relaxation.
New enable bits added: Pack Configuration C
[RlxSmEn] and Pack Configuration D
Dedicated Load Select for Fast
Ra Scaling
Same Load Select option used for
simulations both before and after
Fast Ra Scaling starts.
Allows customization of load used for Fast Ra Scaling New Feature
simulations. Helps for better convergence at end of
discharge. New parameter is added: Fast Scale Load
Disable Thermal model at the
end of discharge
Thermal model may overestimate
Thermal model can be disabled during Fast Ra
heating at end of discharge and can Scaling if needed. Helps for better convergence at
lead to poor convergence to empty. end of discharge.
New bit added to Pack Configuration C:
New Feature
Allow resistance updates
based on IR drop
Resistance updates at lower rates
cannot be reliable at times. They
are not allowed if the current is
Gives extra flexibility in allowing resistance updates at
low rates. This leads to reliable resistance updates in
applications with low rates provided the resistance is
high enough (at low temperatures, for example).
New Feature
Improve simulations at Low
Improves convergence to 0% at low temperature.
New Feature
T ambient (TA) enhancement
Improve adaptability of the gauging algorithm to
external temperature changes during charging.
New bit added to Pack Configuration D:
New Feature
Use Ra1 instead of
interpolation for DOD positions
below grid1
Support TURBO mode
Simulation accuracy at low DOD
Improved simulation accuracy at low depth-ofmay not be accurate at times due to discharge. Improves user experience by avoiding
high resistance.
SOC jump at low depth-of-discharge.
bq27545-G1 to bq27546-G1 Change List
Copyright © 2015, Texas Instruments Incorporated
New Feature
New Feature
SLUA757 – August 2015
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