SLUS785 Datasheet, PDF (2/5 Pages) Texas Instruments – bq27500 Errata (SLUS785)

bq27500 Firmware Revision and Errata List
4 bq27500 Firmware Revision and Errata List
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Firmware
Revision
Shipment Form
IC Lot Codes
Discrepencies
v1.00
Samples
A207, A20E
1. The BAT_GD pin does not operate properly based on temperature.
EVMs (sampled or
purchased)
• SLUS785D data sheet: The BAT_GD pin and the CHG_INH bit in
the Flags () register are to change state based on the values
programmed in data flash (Charge Inhibit Temp Low and Charge
Inhibit Temp High) as described in Table 4-4 of section 5.3.4.
• Operation: The BAT_GD pin and CHG_INH bit are not influenced
by the data flash values Charge Inhibit Temp Low and Charge
Inhibit Temp High. The BAT_GD pin changes state when
temperature exceeds the value programmed in data flash OT Chg.
2. The XCHG bit does not operate properly.
• SLUS785D data sheet: The XCHG bit is set when the temperature
falls outside the range set by the data flash values Suspend Temp
Low and Suspend Temp High as described in Table 4-4.
• Operation: The XCHG bit is not influenced by the data flash
Suspend Temp Low and Suspend Temp High values.
The affected material can be identified by the lot code 3. The part may not enter SLEEP Mode when discharge current is less
on the bq27500 IC in the location shown in Figure 1.
than Sleep Current and greater than 0.
• SLUS785D data sheet: SLEEP mode is entered automatically if the
feature is enabled (Operation Configuration [SLEEP] = 1) and
AverageCurrent () is below the programmable level Sleep Current.
• Operation: The part may not enter Sleep mode.
4. 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.
5. Wake from HIBERNATE mode may require multiple communication
attempts.
• SLUS785D data sheet: Section 5.7.4. The gauge remains in
HIBERNATE mode until the battery is removed or the system
issues a direct I2C command to the gauge.
• Operation: Wake from HIBERNATE mode requires multiple direct
communication attempts.
6. The part may not enter HIBERNATE mode with [HIBERNATE] = 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 taken AND the current
• Operation: The HIBERNATE bit will clear if the battery is not in a
relaxed state preventing entry into HIBERNATE mode.
2
bq27500 Errata (SLUS785)
SLUZ015B – October 2007 – Revised September 2008
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