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BQ20Z80-V101 Datasheet(PDF) 7 Page - Texas Instruments |
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BQ20Z80-V101 Datasheet(HTML) 7 Page - Texas Instruments |
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7 / 75 page  www.ti.com FUNCTIONAL DESCRIPTION OSCILLATOR FUNCTION SYSTEM PRESENT OPERATION GENERAL OPERATION BATTERY PARAMETER MEASUREMENTS bq20z80-V101 SLUS625D – SEPTEMBER 2004 – REVISED OCTOBER 2005 Within the functional description of the bq20z80 System Management Bus (SMBus), commands are prefixed with SBS. and data flash variables are prefixed with DF: and are both italicized in full. For example: SBS.RemainingCapacity( ) and DF:Fast Charge Current. The oscillator of the bq20z80 can be set up for internal or external operation. On power up, the bq20z80 automatically attempts to start the internal oscillator. If a 100-k Ω resistor is not connected to ROSC (pin 33), then it attempts to start the oscillator using an external 32.768-kHz crystal. NOTE: Install either the 100-k Ω ROSC resistor or the 12-pF, 32.768-kHz crystal. Do not install both. The performance of the internal oscillator depends on the tolerance of the 100-k Ω resistor between RSOC (pin 33) and VSSA (pin 34). Choose a resistor with a tolerance of ±0.1%, and 50-ppm or better temperature drift. Place this resistor as close as possible to the bq20z80. If a 12-pF crystal is used, place it as close as possible to the XCK1 (pin 34) and XCK2 (pin 33) pins. If not properly implemented, the PCB layout in this area can degrade oscillator performance. The bq20z80 periodically (1 s) pulls the PU output high. Connect this pin to the PRES pin of the bq20z80 via a resistor of approximately 5 k Ω. The bq20z80 measures the PRES input during the PU-active period to determine its state. The bq20z80 detects that the battery is present in the system via a low state on the PRES input. When this occurs, the bq20z80 enters normal operating mode and sets the PRES bit in SBS.OperationStatus( ). When the pack is removed from the system and the PRES input is high, the bq20z80 enters the battery-removed state, disabling the charge and discharge FETs, and enabling the 0-V/precharging FET. If DF:Operation Cfg B [NR] is set, the PRES input is ignored and can be left floating. NAME CLASS / SUBCLASS FORMAT VALID RANGE SIZE (BYTES) UNITS DEFAULT VALUE Operation Cfg B Configuration / Registers (64) Hex 0x0000 to 0xffff 2 N/A 0x6140 The bq20z80 determines battery capacity by monitoring individual cell voltages and the amount of charge input or removed from a rechargeable battery. In addition, the bq20z80 measures individual cell voltages, pack voltage, temperature, and current using features of the bq29312A analog front end (AFE) device and calculates individual cell impedances using collected data. The bq20z80 measures charge/discharge activity by monitoring the voltage across a small-value series sense resistor (5 m Ω to 20 mΩ typ.) between the cell stack negative terminal and the negative terminal of the battery pack. When an applications load is applied, impedance of each cell is measured by comparing its Open Circuit Voltage (OCV) obtained for the present state of charge using a predefined OCV(SOC) function with measured voltage under load. The bq20z80 interfaces with the bq29312A to perform battery protection, cell balancing, and voltage translation functions. The bq20z80 can accept inputs of up to two identical NTC thermistors (default is Semitec 103AT) for temperature measurement, or can also be configured to use its internal temperature sensor. The bq20z80 uses temperature to monitor the battery-pack environment. The bq20z80 uses an integrating delta-sigma analog-to-digital converter (ADC) for current measurement, and a second delta-sigma ADC for individual cell and battery voltage, and temperature measurement. The individual cell and pack voltages, SBS.CellVoltagex( ), SBS.Voltage( ), SBS.Current( ), SBS.AverageCurrent( ), and SBS.Temperature( ) are updated at 1-second intervals during normal operation. 7 |
Similar Part No. - BQ20Z80-V101_07 |
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