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BQ2092SN Datasheet(PDF) 7 Page - Texas Instruments |
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BQ2092SN Datasheet(HTML) 7 Page - Texas Instruments |
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7 / 30 page  and can be programmed from 0 to 25% per day at 20-30°C. This rate doubles every 10°C increase until T >70 °C or is halved every 10° decrease untilT<10°C. The self-discharge estimate reduces RM by 0.39% of its current value at time intervals spaced so that the aver- age reduction equals the programmed value adjusted for temperature. The EEPROM program constant is the 2’s complement of 52 73 . X , where Xday = % self-discharge rate desired at 25 °C. Charge Control The bq2092 supports SBD charge control by broadcast- ing ChargingCurrent() and ChargingVoltage() to the Smart Charger address. Smart Charger broadcasts can be disabled by writing bit 14 of Battery Mode() to 1. The bq2092-based charge control can be enabled by setting bit 4 in FLAGS2 (MSB of 0x2f) to 1. See Programming the bq2092 for further details. If the Fully_Charged bit is not set in BatteryStatus, the bq2092 broadcasts the fast charge current and voltage to the Smart Charger. The bq2092 broadcasts the maintenance current values (trickle rate) if the Fully_Charged bit is set or Voltage is below EDVF. The bq2092 internal charge control is compatible with nickel-based and Li-Ion chemistries. For Li-Ion, the bq2092 broadcasts the required Charg- ingCurrent and ChargingVoltage according to the values programmed in the external EEPROM. During a valid charge (VQ = 1), the bq2092 signals a valid charge termination when the Terminate_Charge_Alarm and Fully_Charged bits are set in BatteryStatus. These bits are set when the battery is charged more than 256mAh above FCC. For nickel-based chemistries, the bq2092 broadcasts the required charge current and voltage according to the programmed values in the external EEPROM. Maxi- mum temperature and ∆T/∆t are used as valid charge termination methods. Note: Nickel-based chemistries require a charge voltage higher than the maximum cell voltage during charge to ensure constant-current charg- ing. During a valid charge (VQ = 1), if the bq2092 deter- mines a maximum temperature condition, a ∆T/∆t rate greater than the programmed value, or a charge state greater than 256mAh above FCC, then the Termi- nate_Charge_Alarm, Over_Charge_Alarm, and Fully_Charged bits are set in BatteryStatus. Once the bq2092 detects a valid charge termination, the Fully_Charged bit, Terminate_Charge_Alarm, and Over_Charge_Alarm bits are set and the ChargingCurrent is set to zero. Once the terminating condition ceases, the Terminate_Charge_Alarm and OverCharge Alarm bits are cleared and the ChargingCurrent is set to the maintenance rate. The bq2092 requests the maintenance current and charging voltage until RM falls below the full charge percentage. Once this occurs, the Fully_Charged bit is cleared, and the bq2092 requests the fast charging current and charging voltage. During fast charge, the bq2092 suspends charge by requesting zero current and setting the Termi- nate_Charge_Alarm bit in BatteryStatus. Charge is suspended if the actual charge current is 25% greater than the programmed charged current. If the programmed charge current is less than 1024mA, over- current suspend occurs if the actual charge current is 256mA greater than the programmed value. Charge is also suspended if the actual battery voltage is 5% greater than the programmed charge voltage. If the battery temperature is greater than the programmed maximum temperature before charge, then the bq2092 suspends charge requests until the temperature falls below 50°C. If the battery temperature is less than 0°C, the charging current sets to maintenance (trickle) charge current. The fast charging current is requested when the temperature is above 5 °C. ∆T/∆t The ∆T/∆t used by the bq2092 is programmable in both the temperature step (1.6 °C–4.6°C) and time step (20 seconds–320seconds). Typical settings for 1 °C/min include 2 °C over 120 seconds and 3°C over 180 seconds. Longer times are required for increased slope resolution. ∆ ∆ T t is set by the formula: ∆ ∆ T t = () [] lower nibble of 0 13 in E PROM lower nibble 2 ∗∗ + 216 2' s () [] of 0 1f in E PROM C minute 2 ∗∗ 333 . o In addition to the ∆T/∆t timer, there is a hold-off timer, which starts when the battery is being charged at more than 256mA and the temperature is above 25 °C. (This is valid only for NiMH chemistry, bit 5 in FLAGS2 set to 0.) Until this timer expires, ∆T/∆t is suspended. If the temperature falls below 25 °C, or if charging current fallls below 255mA, the timer is reset and restarts only if the above conditions are once again met. Safety Termination If charging continues for more than 256mAh beyond RM = FCC, the Terminate_Charge_Alarm and Fully_Charged bits are set, and the charging current is modified to request maintenance current. If the battery is discharged from full by less than 256mAh, then the safety overcharge termination, for NiMH only, is allowed to extend to 512 mAh. Updating RM after a valid charge termination, RM may optionally be set to a value from 0 to 100% of the Full- ChargeCapacity. If RM is below the value programmed 7 bq2092 Obsolete Device |
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