SLUS785 Datasheet, PDF (4/5 Pages) Texas Instruments – bq27500 Errata (SLUS785)

bq27500 Firmware Revision and Errata List
6 bq27500 Firmware Revision and Errata List
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Firmware
Revision
Shipment
Form
IC Lot Codes
Discrepencies
v1.06
Samples and
production
shipments
Any other code not
listed for Revision
v1.00 or v1.02.
1. Fuel gauging with Load Mode = 1 (indicating the constant power
model) does not operate properly.
• SLUS785D data sheet: Section 5.2.1 allows the selection
of a constant current fuel gauge model or constant power
fuel gauge model.
• Operation: Only the constant current fuel gauge model
operates (Load Mode = 0) properly. For the bq27500, this
is the recommended configuration.
The affected material can be identified by the lot code on 2. The part may not enter HIBERNATE mode with [HIBERNATE] = 1
the bq27500 IC in the location shown in Figure 1
in CONTROL_STATUS
• SLUS785D data sheet: Section 5.7.4. The gauge enters
HIBERNATE when HIBERNATE = 1 in
CONTROL_STATUS register and a valid OCV
measurement is tak0en AND the current drops below
Hibernate Current.
• Operation: The HIBERNATE bit will clear if the battery is
not in a relaxed state preventing entry into HIBERNATE
mode.
3 The part enters HIBERNATE mode based on battery voltage less
than Hibernate Voltage unconditionally.
•
SLUS785D Datasheet: Section 5.7.4. The gauge enters
HIBERNATE when a valid OCV measurement is taken.
•
Operation: The part enters HIBERNATE mode
unconditionally with Vcell (battery voltage) less than
Hibernate Voltage.
4 The part may exit HIBERNATE mode on I2C communication
which is not directed to the bq27500.
•
SLUS785D data sheet: Section 5.7.4. I2C communication
that is not directed to the gauge does not wake the
gauge.
•
Operation: The part may exit HIBERNATE mode on 12C
communication which is not directed to the gauge
5 The part does not always take an OCV reading upon exiting
HIBERNATE mode.
•
SLUS785D data sheet: Section 5.7.4. After waking, the
gauge can proceed the initialization of battery information
(eg OCV).
•
Operation: The part may not always take an OCV reading
upon exiting HIBERNATE mode.
Firmware revision v1.08 of bq27500 (Part number bq27500-V100) corrects the discrepancies in firmware revision v1.06.
4
bq27500 Errata (SLUS785)
SLUZ015B – October 2007 – Revised September 2008
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