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BQ27200 Datasheet(PDF) 11 Page - Texas Instruments |
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BQ27200 Datasheet(HTML) 11 Page - Texas Instruments |
11 / 33 page www.ti.com UDG−03042 Temperature Compensation Self−Discharge Timer Discharge Current Charge Current Last Measured Discharge (LMD) Nominal Available Charge (NAC) Qualified Transfer Learning Count Register (LCR) Temperature, Voltage, Average Current, Other Data Compensated Available Charge + + _ _ INPUTS COMPUTATIONS OUTPUTS Rate and Temperature Compensation I2C or HDQ Interface + _ Register Interface bq27000, bq27200 SLUS556D – SEPTEMBER 2004 – REVISED MARCH 2006 FUNCTIONAL DESCRIPTION (continued) A learning cycle can be disqualified by any of the following conditions: 1. Cold temperature: Temperature ≤ TCOMP[3:0] (°C) when the EDV1 threshold voltage is reached. 2. Light load: A capacity learning cycle is disqualified if average current is less than or equal to 2 times the initial standby load when the EDV1 threshold voltage is reached. 3. Fast voltage drop: VOLT ≤ (EDV1 – 256 mV) before EDV1 is set. 4. Excessive charging: Cumulative Charge > 255 NAC counts (910 µVh) during a learning discharge cycle (alternating discharge/charge/discharge before EDV1 is set). 5. Reset: VDQ is cleared on all resets. 6. Excessive self-discharge: NAC reduction from self-discharge estimate (0.195%) performed 64 times. 7. Self-discharge at termination of learning cycle. If self-discharge estimate causes NAC ≤ LMD/16, VDQ is cleared. NAC is adjusted by charge and discharge coulometric measurements except when battery full or empty conditions are detected. NAC = LMD is forced when IMIN = 1 (full detection) unless Temperature ≤ TCOMP[3:0] ( °C). During a discharge with VDQ = 1, NAC is not allowed to drop below LMD/16 until EDV1 = 1. If EDV1 = 1 occurs when NAC > LMD/16, NAC = LMD/16 will be forced. NAC = 0 is forced if EDVF = 1. Figure 4. Operational Overview The bqJUNIOR stores all calculated information in RAM, which is backed up by the voltage on the RBI input. EEPROM registers store permanent user data. The memory map for bq27000/bq27200 is shown in Table 1. 11 Submit Documentation Feedback |
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