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BQ2013HSN-A514G4 Datasheet(PDF) 8 Page - Texas Instruments |
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BQ2013HSN-A514G4 Datasheet(HTML) 8 Page - Texas Instruments |
8 / 29 page The initial full battery capacity is 35mVh (4667mAh) until the bq2013H “learns” a new capacity with a qualified dis- charge from full to EDV1. 3. Nominal Available Capacity (NAC): NAC counts up during charge to a maximum value of LMD and down during discharge and self dis- charge to 0. NAC is reset to 0 on initialization and on the first valid charge following discharge to EDV1. To prevent overstatement of charge during periods of overcharge, NAC stops incrementing when NAC = LMD. When the DONE input is as- serted high, indicating full charge completion, NAC is set to LMD. 4. Discharge Count Register (DCR): The DCR counts up during discharge independent of NAC and could continue increasing after NAC has decremented to 0. Prior to NAC = 0 (empty battery), both discharge and self-discharge incre- ment the DCR. After NAC = 0, only discharge in- crements the DCR. The DCR resets to 0 when NAC = LMD. The DCR does not roll over but stops counting when it reaches FFFFh. The DCR value becomes the new LMD value on the first charge after a valid discharge to EDV1 if all of the following conditions are met: I No valid charge initiations (charges greater than 2 NAC updates) occurred during the period be- tween NAC = LMD and EDV1. I The self-discharge count is less than 6% of NAC. I The temperature is ≥ 0°C when the EDV1 level is reached during discharge. I VDQ is set. Charge Counting Charge activity is detected based on a positive voltage on the VSR input. If charge activity is detected, the bq2013H increments NAC at a rate proportional to VSRO (VSR +VOS) and, if enabled, activates an LED display if VSRO > 500µV. Charge actions increment the NAC af- ter compensation for charge rate and temperature. The bq2013H detects charge activity with VSRO > 250µV. A valid charge equates to a sustained charge activity greater than 2 NAC updates. Once a valid charge is de- tected, charge counting continues until VSRO drops be- low 250 µV. Discharge Counting All discharge counts where VSRO < -250µV cause the NAC register to decrement and the DCR to increment. If enabled, the display is activated when VSRO < -2mV. The display remains active for 10 seconds after VSRO rises above - 2mV. Self-Discharge Estimation The bq2013H decrements NAC and increments DCR for self-discharge based on time and temperature. The self- discharge count rate is programmed per Table 3. This is the rate for a battery temperature between 20–30°C. The NAC register cannot be decremented below 0. Count Compensations The bq2013H determines fast charge when the NAC up- dates at a rate of ≥ 2 counts/s. Charge activity is com- pensated for temperature and rate before updating NAC. Self-discharge estimation is compensated for tem- perature before updating NAC or DCR. Charge Compensation Charge efficiency factors are selected using Table 5 for trickle charge and fast charge. Fast charge is defined as a rate of charge resulting in ≥ 2 NAC counts/s (0.16C to 0.6C, depending on PFC selections; see Table 2). Temperature adapts the charge rate compensation factors over three ranges between nominal, warm, and hot temperatures. Program pin 5 is used to select one of three compensation programs. These values are shown in Table 5. 8 bq2013H |
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