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BQ2954 Datasheet(PDF) 6 Page - Texas Instruments |
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BQ2954 Datasheet(HTML) 6 Page - Texas Instruments |
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6 / 23 page  time-out limit tQT (i.e., the battery has failed short), the bq2954 enters the Fault state. Then tQT is set to 25% of tMTO.IfVMIN is achieved before expiration of the time limit, the bq2954 begins fast charging. Once in the Fault state, the bq2954 waits until VCC is cy- cled or a new battery insertion is detected. It then starts a new charge cycle and begins the qualification process again. Charge Status Display Charge status is indicated by the LED driver outputs LED1–LED2. Three display modes (Tables 1– 3) are avail- able in the bq2954 and are selected by configuring pin DSEL. Table 1 illustrates a normal fast charge cycle, Ta- ble 2 a recharge-after-fast-charge cycle, and Table 3 an ab- normal condition. Configuring the Display Mode, IFULL/IMIN, and ISENSE DSEL/LED2 and CSEL/LED1 are bi-directional pins with two functions: as LED driver pins (output) and as programming pins (input). The selection of pull-up, pull-down, or no-resistor programs the display mode on DSEL as shown in Tables 1 through 3. A pull-down or no-resistor programs the current-sense mode on CSEL. The bq2954 latches the programming data sensed on the DSEL and CSEL input when VCC rises to a valid level. The LEDs go blank for approximately 400ms (typi- cal) while new programming data are latched. When fast charge reaches a condition where the charg- ing current drops below IFULL, the LED1 and LED2 outputs indicate a full-battery condition. Fast charge terminates when the charging current drops below the 6 bq2954 GR295401.eps VBAT IBAT VREG IMAX VMIN ICOND IFULL IMIN Battery Absent Qualification Charge Complete Low Low Low Low Low Low Low High Low High MTO Fast Charge Current Regulate LED1 LED2 LED1 LED2 LED1 LED2 CHG BTST CHG BTST High Low High Low High Low High Low High High High Low High Low High Low High Low High Low High Low High Low High High High Low High Low Low High Low High Low High High Low High Low Low High Low High Low High Low Low Low Low Mode 1 (DSEL = 0) Mode 2 (DSEL = 1) Mode 3 (DSEL = F) Mode 1 and 2 Mode 3 Time Voltage Regulate Current Taper IFULL Detect Table 1. Normal Fast Charge Cycle |
Similar Part No. - BQ2954_13 |
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Similar Description - BQ2954_13 |
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