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BQ2012SN-D107TR Datasheet(PDF) 7 Page - Texas Instruments |
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BQ2012SN-D107TR Datasheet(HTML) 7 Page - Texas Instruments |
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7 / 26 page  3. Nominal Available Charge (NAC): NAC counts up during charge to a maximum value of LMD and down during discharge and self-discharge to 0. NAC is reset to 0 on initializa- tion (PROG6 = Z or low) and on reaching EDV1. NAC is set to PFC on initialization if PROG6 = high. To prevent overstatement of charge during periods of overcharge, NAC stops incrementing when NAC = 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. DCR stops counting when EDV1 is reached. Prior to NAC = 0 (empty battery), both discharge and self-discharge increment the DCR. After NAC = 0, only discharge increments 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 VEDV1 if: No valid charge initiations (charges greater than 256 NAC counts; where VSRO >VSRQ) occurred dur- ing the period between NAC = LMD and EDV1 de- tected. The self-discharge count is not more than 4096 counts (8% to 18% of PFC, specific percentage threshold determined by PFC). The temperature is ≥ 0°C when the EDV1 level is reached during discharge. The valid discharge flag (VDQ) indicates whether the present discharge is valid for LMD update. Charge Counting Charge activity is detected based on a positive voltage on the VSR input. If charge activity is detected, the bq2012 increments NAC at a rate proportional to VSRO (VSR +VOS) and, if enabled, activates the LED display if the rate is equivalent to VSRO > 4mV. Charge actions in- crement the NAC after compensation for charge rate and temperature. The bq2012 determines charge activity sustained at a continuous rate equivalent to VSRO >VSRQ. A valid charge equates to sustained charge activity greater than 256 NAC counts. Once a valid charge is detected, charge counting continues until VSRO falls below VSRQ.VSRQ is a programmable threshold as described in the Digital Magnitude Filter section. The default value for VSRQ is 375 µV. Charge Control Charge control is provided by the CHG output. This output is asserted continuously when: NAC < 0.94 * LMD and 0.95V < VSB < 2.25V and 0°C < Temp < 50°C and BRM=0 This output is asserted at a 1 16 duty cycle (low for 0.5 sec and high for 7.5 sec) when the above conditions are not met and: NAC < LMD and 0.95V < VSB < 2.25V and Temp < 50°C and BRM=0 This output is also asserted at a 1 16 duty cycle (low for 0.5 sec and high for 7.5 sec) for a 2-hour top-off period after: NAC = LMD and Temp < 50°C and 0.95V < VSB < 2.25V and BRM=0 This output is inactive when: NAC = LMD (after a 2-hour top-off period) or Temp > 50°C or VSB < 0.95V or VSB > 2.25V or BRM=1 The top-off timer (2 hours) is reset to allow another top- off after the battery is discharged to 0.8 * LMD (PROG6 =L)or0.8 * PFC (PROG6 =ZorH). Caution: The charge control output (CHG) should be used with other forms of charge termination such as ∆T/∆t and -∆V. If charge terminates due to maximum temperature, the battery temperature must fall typically 10°C below 50°C before the charge output becomes active again. Discharge Counting All discharge counts where VSRO <VSRD cause the NAC register to decrement and the DCR to increment. Ex- ceeding the fast discharge threshold (FDQ) if the rate is equivalent to VSRO < -4mV activates the display, if en- abled. The display becomes inactive after VSRO rises above -4mV. VSRD is a programmable threshold as described in the Digital Magnitude Filter section. The default value for VSRD is -300 µV. 7 bq2012 Not Recommended For New Designs |
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