Texas Instruments | BQ27Z561 to BQ27Z561-R1 Change List | Application notes | Texas Instruments BQ27Z561 to BQ27Z561-R1 Change List Application notes

Texas Instruments BQ27Z561 to BQ27Z561-R1 Change List Application notes
Application Report
SLUA956 – April 2019
BQ27Z561 to BQ27Z561-R1 Change List
Garry Elder
ABSTRACT
This document describes the changes made from the BQ27Z561 device to the BQ27Z561-R1 device. The
BQ27Z561-R1 Impedance Track™ Battery Gas Gauge Solution for 1-Series Cell Li-ion Battery Packs
Data Sheet (SLUSDH5), the latest ordering information, and the BQ27Z561-R1 Technical Reference
Manual (SLUUBY5) are available on TI.com.
1
Trademarks
Impedance Track™ is the trademark of Texas Instruments.
All other trademarks are the property of their respective owners.
2
Introduction
The BQ27Z561-R1 device enables several feature additions and performance improvements to the
BQ27Z561 device.
3
Change Details
Table 1. Change Descriptions
Change Description
BQ27Z561
BQ27Z561-R1
Comments
LiFePO4 chemistry support
Not present
New feature
The LFP_RELAX feature supports slower relaxation at the end of charge. There
is a change of OCVFR functionality when LiFePO4 is selected to clear after 48
hours or when cell voltage falls below FlatVoltMin. This new feature enables
the option to use DOD data at valid charge termination (VCT) and after
relaxation is detected.
ManufacturerInfoB() support
Not present
New feature
An additional block read of scratch pad data flash that can be 4 to 32 bytes long
Time-based lifetime features
Not present
New feature
New time-based lifetime features that include total run time and time spent at
different temperature ranges
Fast OCV update option
Not present
New feature
When enabled, voltage data is used after a fixed time for OCV calculation rather
than waiting for a dV/dt of 2 µs, which is the normal method.
Battery Trip Point (BTP) feature
Not present
New feature
Either the BTP feature or the INT feature can be selected for use with INT,
which is also enabled with additional options.
Ability for charging thresholds to be
manipulated by
RelativeStateOfCharge() (RSOC)
Not present
New feature
Reported charging parameters can be optionally changed based on a level of
RSOC() rather than voltage.
The state-of-health (SOH) algorithm now uses the following:
● Min Delta Voltage, rather than Delta Voltage, to calculate EDV
Improved state-of-health (SOH)
algorithm
Present, but with a lessenhanced algorithm
Enhanced feature
● The JEITA Rec Temp Charging:Voltage, rather than the present voltage
at charge termination
● The new data flash SOH Temp A and SOH Temp K, which are generated
and used in simulations along with SOH Load Rate
● The current used at EOC during simulation is Taper Current, rather than
the measured current.
Enhanced ChargingCurrent() and
ChargingVoltage() reporting
options
SLUA956 – April 2019
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Present, but with lessenhanced options
Enhanced feature
ChargingCurrent() and ChargingVoltage() can have separate values for the
JEITA ranges of STL and STH, and can be enabled with SLEEPCHG to report
non-zero values when charging and when the device is in SLEEP mode.
BQ27Z561 to BQ27Z561-R1 Change List
Copyright © 2019, Texas Instruments Incorporated
1
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