Errata SLUZ015B – October 2007 – Revised September 2008 bq27500 Errata (SLUS785) 1 Summary This errata summarizes the discrepancies among firmware versions 1.00, 1.02, 1.06, and 1.08 of the bq27500 and the data sheet, SLUS785D. • Part Numbers—bq27500drzr, bq27500drzt, and bq27500EVM • Lot Code—A207, A20E, DHNE, K042, K043, K04R (See Section 3 package markings diagram to identify affected material) • Product Type—bq27500 IC samples (or purchased), bq27500 EVM sampled or purchased • Device Version—1.00, 1.02, 1.06, 1.08 2 Discrepancies See the following tables for a list of discrepancies for device versions 1.00, 1.02, 1.06, and 1.08. 3 Identification of Affected Materials The affected material can be identified by the top-side brand on the bq27500 IC in the location shown in Figure 1, as LLLL. Figure 1. bq27500 IC Markings BQ 2750 TI S LLLL o Note: BQ TI S LLLL O Symbol in lower case TI logo Assembly site Lot Code (e.g. A207) Pin 1 Locator IC Markings are left-aligned. SLUZ015B – October 2007 – Revised September 2008 Submit Documentation Feedback bq27500 Errata (SLUS785) 1 bq27500 Firmware Revision and Errata List 4 www.ti.com bq27500 Firmware Revision and Errata List Firmware Revision Shipment Form IC Lot Codes v1.00 Samples A207, A20E EVMs (sampled or purchased) Discrepencies 1. The BAT_GD pin does not operate properly based on temperature. • 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 2 bq27500 Errata (SLUS785) • 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. SLUZ015B – October 2007 – Revised September 2008 Submit Documentation Feedback bq27500 Firmware Revision and Errata List www.ti.com 5 bq27500 Firmware Revision and Errata List Firmware Shipment Form Revision v1.02 Samples and production shipments IC Lot Codes D4NE, A207, K042, K043, K04R EVMs (sampled or purchased)) The affected material can be identified by the lot code on the bq27500 IC in the location shown in Figure 1. Discrepencies 1. The part may not enter SLEEP Mode when discharge current is less 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. 2. 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. 3. 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. 4. The part may not enter HIBERNATE mode with [HIBERNATE] = 1 in CONTROL_STATUS SLUZ015B – October 2007 – Revised September 2008 Submit Documentation Feedback • 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 drops below Hibernate Current. • Operation: The HIBERNATE bit will clear if the battery is not in a relaxed state preventing entry into HIBERNATE mode. bq27500 Errata (SLUS785) 3 bq27500 Firmware Revision and Errata List 6 www.ti.com bq27500 Firmware Revision and Errata List Firmware Revision Shipment Form IC Lot Codes v1.06 Samples and production shipments Any other code not listed for Revision v1.00 or v1.02. The affected material can be identified by the lot code on the bq27500 IC in the location shown in Figure 1 Discrepencies 1. 2. 3 4 5 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 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 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. 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. 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 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 Submit Documentation Feedback IMPORTANT NOTICE Texas Instruments Incorporated and its subsidiaries (TI) reserve the right to make corrections, modifications, enhancements, improvements, and other changes to its products and services at any time and to discontinue any product or service without notice. Customers should obtain the latest relevant information before placing orders and should verify that such information is current and complete. All products are sold subject to TI’s terms and conditions of sale supplied at the time of order acknowledgment. TI warrants performance of its hardware products to the specifications applicable at the time of sale in accordance with TI’s standard warranty. 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