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bq27500 Firmware Revision and Errata List

bq27500 Firmware Revision and Errata List

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Firmware

Shipment Form

IC Lot Codes

Discrepencies

Revision

v1.00

Samples

A207, A20E

1.

The BAT_GD pin does not operate properly based on temperature.

EVMs (sampled or

• SLUS785D data sheet: The BAT_GD pin and the CHG_INH bit in

purchased)

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.

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bq27500 Errata (SLUS785)

SLUZ015B – October 2007 – Revised September 2008

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