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BQ2054PN Datasheet(PDF) 5 Page - Texas Instruments |
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BQ2054PN Datasheet(HTML) 5 Page - Texas Instruments |
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5 / 19 page  Charge Status Display Charge status is enunciated by the LED driver outputs LED1–LED3. Three display modes are available in the bq2054; the user selects a display mode by configuring pin DSEL. Table 1 shows the three display modes. The bq2054 does not distinguish between an over- voltage fault and a “battery absent” condition. The bq2054 enters the Fault state, enunciated by turning on LED3, whenever the battery is absent. The bq2054, therefore, gives an indication that the charger is on even when no battery is in place to be charged. Configuring the Display Mode and IMIN DSEL/LED2 is a bi-directional pin with two functions; it is an LED driver pin as an output and a programming pin as an input. The selection of pull-up, pull-down, or no pull resistor programs the display mode on DSEL per Table 1. The bq2054 latches the programming data sensed on the DSEL input when any one of the following three events occurs: 1. VCC rises to a valid level. 2. The bq2054 leaves the Fault state. 3. The bq2054 detects battery insertion. The LEDs go blank for approximately 750ms (typical) while new programming data is latched. 5 bq2054 Mode Charge Action State LED1 LED2 LED3 DSEL = 0 (Mode 1) Battery absent or over-voltage fault Low Low High Pre-charge qualification Flash Low Low Fast charging High Low Low Charge complete Low High Low Charge pending (temperature out of range) X X Flash Charging fault X X High DSEL = 1 (Mode 2) Battery absent or over-voltage fault Low Low High Pre-charge qualification High High Low Fast charge Low High Low Charge complete High Low Low Charge pending (temperature out of range) X X Flash Charging fault X X High DSEL = Float (Mode 3) Battery absent or over-voltage fault Low Low High Pre-charge qualification Flash Flash Low Fast charge: current regulation Low High Low Fast charge: voltage regulation High High Low Charge complete High Low Low Charge pending (temperature out of range) X X Flash Charging fault X X High Note: 1 = VCC; 0 = VSS; X = LED state when fault occurred; Flash = 1 6 sec. low, 1 6 sec high. Table 1. bq2054 Display Output Summary |
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