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BQ29330DBTR 参数 Datasheet PDF下载

BQ29330DBTR图片预览
型号: BQ29330DBTR
PDF下载: 下载PDF文件 查看货源
内容描述: 2-, 3-和4芯锂离子或锂聚合物电池保护AFE [2-,3-,AND 4-CELL LITHIUM-ION OR LITHIUM-POLYMER BATTERY PROTECTION AFE]
分类和应用: 电源电路电池电源管理电路光电二极管
文件页数/大小: 26 页 / 1128 K
品牌: TI [ TEXAS INSTRUMENTS ]
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bq29330  
www.ti.com  
SLUS673ASEPTEMBER 2005REVISED DECEMBER 2005  
FUNCTIONAL DESCRIPTION (continued)  
OVERLOAD, SHORT CIRCUIT IN CHARGE AND SHORT CIRCUIT IN DISCHARGE RESPONSE  
When an overload, short circuit in charge, or short circuit in discharge fault is detected, the FETs are turned off.  
The STATUS (b0b3) register reports the details of overload, short circuit in charge or short-circuit discharge.  
The respective STATUS (b0b3) bits are set to 1 and the XALERT output is triggered. This condition is latched  
until the STATE_CONTROL (b7) is set and then reset. If a FET is turned on after resetting STATE_CONTROL  
(b0) and the error condition is still present on the system, then the device again enters the protection response  
state.  
2-, 3-, or 4-CELL CONFIGURATION  
In a 2-cell configuration, VC1 and VC2 are shorted to VC3. In a 3-cell configuration, VC1 is shorted to VC2.  
CELL VOLTAGE  
The cell voltage is translated to allow a system host to measure individual series elements of the battery. The  
series element voltage is translated to a GND-based voltage equal to 0.15 ±0.003 of the series element voltage.  
This provides a range from 0 to 4.5 V. The translation output is presented between CELL+ and CELL– pins of  
the bq29330 and is inversely proportional to the input using the following equation.  
Where, V(CELLOUT) = –K × V(CELLIN) + 0.975 (V)  
Programming CELL_SEL (b1, b0) selects the individual series element. The CELL_SEL (b3, b2) selects the  
voltage monitor mode, cell monitor, offset, etc.  
CALIBRATION OF CELL VOLTAGE MONITOR AMPLIFIER GAIN  
The cell voltage monitor amplifier has an offset, and to increase accuracy, this can be calibrated.  
The following procedure shows how to measure and calculate the offset as an example.  
Step 1  
Set CAL1=1, CAL0=1, VMEN=1.  
VREF is trimmed to 0.975 V within ±1%; measuring VREF eliminates its error.  
Measure internal reference voltage VREF from VCELL directly.  
VREF = measured reference voltage  
Step 2  
Set CAL1=0, CAL0=1, CELL1=0, CELL0=0, VMEN=1.  
The output voltage includes the offset and represented by:  
VOUT(4-5) = VREF + (1 + K) × VOS (V)  
Where K = CELL Scaling Factor  
VOS = Offset voltage at input of the internal operational amplifier  
Step 3  
Set CAL1=1, CAL0=0, CELL1=0, CELL0=0, VMEN=1.  
Measure scaled REF voltage through VCELL amplifier.  
The output voltage includes the scale factor error and offset and is represented by:  
V(OUTR) = VREF + (1 + K) × VOS – K × VREF (V)  
Step 4  
Calculate (VOUT(4-5)– V(OUTR)) / VREF.  
The result is the actual scaling factor, KACT and is represented by:  
12  
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