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BQ2007PN- Datasheet(PDF) 5 Page - Texas Instruments |
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BQ2007PN- Datasheet(HTML) 5 Page - Texas Instruments |
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5 / 16 page  Outputs LED1–2 have three display modes that are selected at initialization by the input pins DSEL1 and DSEL2. The DSEL1 and DSEL2 input pins, when pulled down to VSS, are intended for implementation of a simple two-LED system. LED2 indicates the precharge status (i.e., charge pending and discharge) and LED1 indi- cates the charge status (i.e., charging and completion). DSEL1 pulled up to VCC and DSEL2 pulled down to VSS mode is for implementation of a single tri-color LED such that discharge, charging, and completion each have a unique color. DSEL1 pulled down to VSS and DSEL2 pulled up to VCC allows for fault status information to be displayed. Audio Output Alarm The bq2007 audio alarm output generates an audio tone to indicate a charge completion or fault condition. The audio alarm output is a symmetrical duty-cycle AC sig- nal that is compatible with standard piezoelectric alarm elements. A valid battery insertion is indicated by a sin- gle high-tone beep of 1 2-second typical duration. The charge completion and fault conditions are indicated by a 9.5- to 15-second high-tone sequence of 1 2-second typi- cal duration at a 2-second typical repetition rate. Charge Status Monitoring The bq2007 charge status monitor may display the bat- tery voltage or charge safety timer as a percentage of the full-charged condition. These options are selected with the MULT soft-programmed input pin. When MULT is pulled down to VSS, the battery charge status is displayed as a percentage of the battery voltage, and the single-cell battery voltage at the BAT pin is compared with internal charge voltage reference thresholds. When VBAT is greater than the internal thresholds of V20,V40,V60,or V80, the respective 20%, 40%, 60%, or 80% display outputs are activated. The battery voltage directly indicates 20% charge increments, while the 10% charge increments use a timer that is a function of the charge safety timer. When MULT is pulled down to VSS and when VBAT exceeds V20 during charging, the 20% charge indication is activated and the timer begins counting for a period equal to 1 64 to 1 32 of the charge safety time-out period. When the timer count is completed, the 30% charge indication is activated. Should VBAT exceed V40 prior to the timer count completion, the charge status monitor activates the 30% and 40% indications. This technique 5 bq2007 Charge Action State Conditions MOD Output DIS Output Battery absent VCC applied and VCELL ≥ VMCV Trickle charge per Table 4 Low Charge initiation VCC applied or VCELL drops from ≥ VMCV to < VMCV - Low Discharge-before- charge DCMD high-to-low transition or to VSS on charge initiation and VEDV < VCELL < VMCV Low High Charge pending Charge initiation occurred and VTEMP ≥ VLTF or VTEMP ≤ VTCO or VCELL < VEDV Trickle charge per Table 4 Low Fast charging Charge pending complete and FAST = VCC Low if VSNS > 250mV; high if VSNS < 200mV Low Standard charging Charge pending complete and FAST = VSS Low if VSNS > 250mV; high if VSNS < 200mV Low Charge complete - ∆V termination or VTEMP < VTCO or PVD ≥ 0 to -3mV/cell or maximum time-out or VCELL > VMCV -- Top-off pending VSEL = VCC, charge complete and VTEMP ≥ VLTF or VTEMP ≤ VTCO or VCELL < VEDV Trickle charge per Table 4 Low Top-off charging VSEL = VCC and charge complete and time-out not exceeded and VTEMP > VTCO and VCELL < VMCV Activated per VSNS for 73ms of every 585ms Low Trickle charging Charge complete and top-off disabled or top-off complete or pending Trickle charge per Table 4 Low Fault Charge pending state and charge pending time-out (tPEND) complete Trickle charge per Table 4 Low Definitions: VCELL = VBAT - VSNS;VMCV = 0.8 * VCC;VEDV = 0.262 * VCC or 0.4 * VCC;VTEMP = VTS - VSNS; VLTF = 0.5 * VCC. Table 1. bq2007 Operational Summary |
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