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BQ2003S Datasheet(PDF) 5 Page - Texas Instruments |
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BQ2003S Datasheet(HTML) 5 Page - Texas Instruments |
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5 / 18 page  the allowed limits. If the voltage is too high, the chip goes to the battery absent state and waits until a new charge cycle is started. Fast charge continues until termination by one or more of the five possible termination conditions: n Delta temperature/delta time ( ∆T/∆t) n Negative delta voltage (- ∆V) n Maximum voltage n Maximum temperature n Maximum time - ∆V Termination If the DVEN input is high, the bq2003 samples the volt- age at the BAT pin once every 34s. If VCELL is lower than any previously measured value by 12mV ±4mV, fast charge is terminated. The - ∆V test is valid in the range VMCV - (0.2 ∗ VCC)<VCELL <VMCV. Voltage Sampling Each sample is an average of 16 voltage measurements taken 57 µs apart. The resulting sample period (18.18ms) filters out harmonics around 55Hz. This technique mini- mizes the effect of any AC line ripple that may feed through the power supply from either 50Hz or 60Hz AC sources. Tolerance on all timing is ±16%. Voltage Termination Hold-off A hold-off period occurs at the start of fast charging. During the hold-off period, - ∆V termination is disabled. This avoids premature termination on the voltage spikes sometimes produced by older batteries when fast-charge current is first applied. ∆T/∆t, maximum voltage and maximum temperature terminations are not affected by the hold-off period. ∆T/∆t Termination The bq2003 samples at the voltage at the TS pin every 34s, and compares it to the value measured two samples earlier. If VTEMP has fallen 16mV ±4mV or more, fast charge is terminated. The ∆T/∆t termination test is valid only when VTCO <VTEMP <VLTF. Temperature Sampling Each sample is an average of 16 voltage measurements taken 57 µs apart. The resulting sample period (18.18ms) filters out harmonics around 55Hz. This tech- nique minimizes the effect of any AC line ripple that may feed through the power supply from either 50Hz or 60Hz AC sources. Tolerance on all timing is ±16%. Maximum Voltage, Temperature, and Time Anytime VCELL rises above VMCV, CHG goes high (the LED goes off) immediately. If the bq2003 is not in the voltage hold-off period, fast charging ceases if VCELL remains above MCV for a minimum of tMCV.If VCELL then falls back be- low VMCV before 1.5tMCV ±50ms, the chip transitions to the Charge Complete state (maximum voltage termination). If VCELL remains above VMCV beyond 1.5tMCV, the bq2003 transitions to the Battery Absent state (battery removal). See Figure 3. If the bq2003 is in the voltage hold-off period when VCELL rises above VMCV, the LED goes out but fast charging continues until the expiration of the hold-off period. Temperature sampling continues during the hold-off period as well. If a new battery is inserted be- fore the hold-off period expires, it continues in the fast charge cycle started by its predecessor. No precharge qualification is performed, and a temperature sample 5 bq2003 Corresponding Fast-Charge Rate TM1 TM2 Typical Fast Charge and Top-Off Time Limits Typical - ∆V/MCV Hold-Off Time (seconds) Top-Off Rate C/4 Low Low 360 137 Disabled C/2 Float Low 180 820 Disabled 1C High Low 90 410 Disabled 2C Low Float 45 200 Disabled 4C Float Float 23 100 Disabled C/2 High Float 180 820 C/16 1C Low High 90 410 C/8 2C Float High 45 200 C/4 4C High High 23 100 C/2 Note: Typical conditions = 25°C, VCC = 5.0V. Table 2. Fast-Charge Safety Time/Hold-Off/Top-Off Table |
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