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BQ2040SN Datasheet(PDF) 9 Page - Texas Instruments |
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BQ2040SN Datasheet(HTML) 9 Page - Texas Instruments |
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9 / 33 page  Charge Suspension The bq2040 may temporarily suspend charge if it detects a charging fault. The charging faults include the follow- ing conditions: n Maximum Overcharge: If charging continues for more than the programmed maximum overcharge limit as defined in EE 0x3a—0x3b beyond RM=FCC, the Fully_Charged bit is set, and the requested charging current is set to the maintenance rate. n Overvoltage: An over-voltage fault exists when the bq2040 measures a voltage more than 5% above the ChargingVoltage. When the bq2040 detects an overvoltage condition, the requested charge current is set to 0 and the Terminate_Charge_Alarm bit is set in BatteryStatus. The alarm bit is cleared when the current drops below 256mA and the voltage is less than 105% of ChargingVoltage. n Overcurrent: An overcurrent fault exists when the bq2040 measures a charge current more than 25% above the ChargingCurrent. If the ChargingCurrent is less than 1024mA, an overcurrent fault exists if the charge current is more than 1mA above the lowest multiple of 256mA that exceeds the ChargingCurrent. When the bq2040 detects an overcurrent condition, the requested charge current is set to 0 and the Terminate_Charge_Alarm bit is set in Battery Status. The alarm bit is cleared when the current drops below 256mA. n Maximum Temperature: When the battery temperature equals the programmed maximum temperature, the requested charge current is set to zero and the Over_Temp_Alarm and the Terminate_Charge_Alarm bits are set in Battery Status. The Over_Temp_Alarm bit is cleared when the temperature drops to 43°C below the maximum temperature threshold minus 5 °C. n PSTAT: When the PSTAT input is ≥1.5V, the requested charge current is set to 0 and the Terminate_Charge_Alarm bit is set in BatteryStatus if the Discharging flag is not set. The alarm bit is cleared when the PSTAT input is <1.0V or the Discharging flag is set. n Low Temperature: When the battery temperature is less than 12°C (LTF bit in FLAGS2 set), the requested charge current is set to the maintenance rate. Once the temperature is above 15 °C, the requested charge current is set to the fast rate. n Undervoltage: When the battery voltage is below the EDVF threshold, the requested charge current is set to the EDVF rate stored in EE0x5a/0x5b. Once the voltage is above EDVF, the requested charge current is set to the fast or maintenance rate depending on the state of the LTF bit. Count Compensations Charge activity is compensated for temperature and state-of-charge before updating the RM and/or DCR. Self-discharge estimation is compensated for tempera- ture before updating RM or DCR. Charge Compensation Charge efficiency is compensated for state-of-charge, temperature, and battery chemistry. The charge effi- ciency is adjusted using the following equations: 1.) RM RM * Q Q EFC ET =− () where RelativeStateOfCharge < FullChargePercentage, and Q EFC is the programmed fast-charge efficiency vary- ing from 0.75 to 1.0. 2.) RM RM Q Q ETC ET =− *( ) where RelativeStateOfCharge ≥ FullChargePercentage and Q ETC is the programmed maintenance (trickle) charge efficiency varying from 0.75 to 1.0. Q ET is used to adjust the charge efficiency as the battery temperature increases according to the following: Qif T ET =< 030 °C QC T C ET =° ≤ < ° 002 30 40 .if QT C ET =≥ ° 005 40 .if QET is 0 over the entire temperature range for Li-Ion. Digital Magnitude Filter The bq2040 has a programmable digital filter to elimi- nate charge and discharge counting below a set threshold, VSRD. Table 2 shows typical digital filter settings. The proper digital filter setting can be calcu- lated using the following equation. DMF = 45 VSRD 9 bq2040 DMF DMF Hex. VSRD (mV) 75 4B 0.60 100 64 0.45 150 96 0.30 175 AF 0.26 200 C8 0.23 Table 2. Typical Digital Filter Settings |
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