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BQ2004ESNTR Datasheet(PDF) 5 Page - Texas Instruments |
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BQ2004ESNTR Datasheet(HTML) 5 Page - Texas Instruments |
5 / 18 page 5 VSEL Input Voltage Termination Low Disabled Float - ∆V High PVD Voltage Sampling Each sample is an average of voltage measurements. The IC takes 32 measurements in PVD mode and 16 measurements in - ∆V mode. The resulting sample peri- ods (9.17ms and 18.18ms, respectively) filter out har- monics centered around 55Hz and 109Hz. 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%. Temperature and Voltag e Termination Hold-off A hold-off period occurs at the start of fast charging. During the hold-off period, - ∆V and ∆T/∆t termination are disabled. The MOD pin is enabled at a duty cycle of 260 µs active for every 1820µs inactive. This modulation results in an average rate 1/8th that of the fast charge rate. This avoids premature termination on the voltage spikes sometimes produced by older batteries when fast-charge current is first applied. Maximum voltage and maximum temperature terminations are not af- fected by the hold-off period. ∆T/∆t Termination The bq2004E/H 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. The resulting sample period (18.18ms) filters out har- monics around 55Hz. This technique minimizes the ef- fect of any AC line ripple that may feed through the power supply from either 50Hz or 60Hz AC sources. Tol- erance on all timing is ±16%. Maximum Voltage, Temperature, and Time Anytime VCELL rises above VMCV, the LEDs go off and cur- rent flow into the battery ceases immediately. If VCELL then falls back below VMCV before tMCV = 1.5s ±0.5s, the chip transitions to the Charge Complete state (maximum voltage termination). If VCELL remains above VMCV at the expiration of tMCV, the bq2004E/H transitions to the Bat- tery Absent state (battery removal). See Figure 3. Maximum temperature termination occurs anytime VTEMP falls below the temperature cutoff threshold VTCO. Charge will also be terminated if VTEMP rises above the low temperature fault threshold, VLTF, after fast charge begins. Corresponding Fast-Charge Rate TM1 TM2 Typical Fast-Charge Safety Time (min) Typical PVD, - ∆V Hold-Off Time (s) Top-Off Rate Pulse- Trickle Rate Pulse- Trickle Period (Hz) 2004E 2004H 2004E 2004H 2004E 2004H 2004E 2004H 2004E 2004H C/4 C/8 Low Low 325 650 137 273 Disabled Disabled Disabled C/2 C/4 Float Low 154 325 546 546 Disabled C/512 15 30 1C C/2 High Low 77 154 273 546 Disabled C/512 7.5 15 2C 1C Low Float 39 77 137 273 Disabled C/512 3.75 7.5 4C 2C Float Float 19 39 68 137 Disabled C/512 1.88 3.75 C/2 C/4 High Float 154 325 546 546 C/16 C/32 C/512 15 30 1C C/2 Low High 77 154 273 546 C/8 C/16 C/512 7.5 15 2C 1C Float High 39 77 137 273 C/4 C/18 C/512 3.75 7.5 4C 2C High High 19 39 68 137 C/2 C/4 C/512 1.88 3.75 Note: Typical conditions = 25°C, VCC = 5.0V. Table 1. Fast Charge Safety Time/Hold-Off/Top-Off Table bq2004E/H |
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