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BQ2005S Datasheet(PDF) 5 Page - Texas Instruments |
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BQ2005S Datasheet(HTML) 5 Page - Texas Instruments |
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5 / 18 page  - V Termination If the DVEN input is high, the bq2005 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 a part. 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%. 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 bq2005 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 bq2005 is not in the voltage hold-off period, fast charging also ceases immediately. If VCELL then falls back below VMCV before t MCV =1s (maximum), the chip transitions to the Charge Complete state (maximum voltage termination). If VCELL remains above VMCV at the expiration of tMCV, the bq2005 transi- tions to the Battery Absent state (battery removal). See Figure 4. Maximum temperature termination occurs anytime the voltage on the TS pin falls below the temperature cut-off threshold VTCO. Charge will also be terminated if VTEMP rises above the minimum temperature fault threshold, VLTF, after fast charge begins. Maximum charge time is configured using the TM pin. Time settings are available for corresponding charge rates of C/4, C/2, 1C, and 2C. Maximum time-out termi- nation is enforced on the fast-charge phase, then reset, and enforced again on the top-off phase, if selected. There is no time limit on the trickle-charge phase. Top-off Charge An optional top-off charge phase may be selected to follow fast charge termination for the C/2 through 4C rates. This phase may be necessary on NiMH or other 5 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 1. Fast Charge Safety Time/Hold-Off/Top-Off Table bq2005 |
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