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OZ890 App Notes Collection_shortest

更新时间：2020-01-03 17:11:53 大小：485K 上传用户：lijjie查看TA发布的资源 标签：oz890 下载积分：2分 评价赚积分 （如何评价?） 打赏 收藏 评论(0) 举报

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OZ890 App Notes Collection_shortest

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OZ890_App_Notes_Collection_shortest.pdf 485K

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OZ890  
Application Note –1  
Battery Pack Assembly Sequence  
and Connections Technique  
Scope  
This application note describes a recommended battery pack assembly sequence and  
connections technique between the battery pack and the PCB board for OZ890  
application.  
Description  
OZ890 supports 5~13 series Li-ion battery pack, with integrated 13-channel ADC (13bit)  
for cell voltage measurement.  
A 13 series battery pack application is shown in Fig.1. Optimizing the connection for cell  
voltage measurement channel can improve the accuracy of measurement for the lowest  
cell1 and the highest cell13. For cell voltage measurements, trace voltage drops for high  
current will reduce the accuracy of the lowest cell1 and the highest cell13, as there is  
high voltage drop along high current traces on VBAT+ and GND. Separate BC0 and  
GND/BC13 and VBAT+ from high current ground/power path, connect BC0 to GND  
(high current ground) at the negative terminal of the lowest cell1. Connect BC13 to  
VBAT+ (high current power) at the positive terminal of the highest cell 13. This  
approach is depicted in Fig.1.  
Fig.2 shows another connection between the battery pack and the PCB board. This  
approach reduces the accuracy of measurement of the lowest cell1 and the highest  
cell13 due to voltage drop along high current traces on VBAT+ and GND.  
VBAT+  
GND  
BC13  
BC12  
BC11  
BC10  
BC9  
BC8  
BC7  
BC6  
BC5  
BC4  
BC3  
BC2  
BC1  
BC0  
Cell 2  
Cell 1  
Cell 7  
Cell 3  
Cell 9  
Cell 8  
Cell 6  
Cell 5  
Cell 4  
Cell13  
Cell 12  
Cell 11  
Cell 10  
Figure 1  
VBAT+  
GND  
BC13  
BC12  
BC11  
BC10  
BC9  
BC8  
BC7  
BC6  
BC5  
BC4  
BC3  
BC2  
BC1  
BC0  
Cell 2  
Cell 1  
Cell 7  
Cell 3  
Cell 9  
Cell 8  
Cell 6  
Cell 5  
Cell 4  
Cell13  
Cell 12  
Cell 11  
Cell 10  
Figure 2  
03/22/07  
Copyright © 2005-07 by O2Micro  
OZ890_AN1_v0.6  
All Rights Reserved  
Page 1  
CONFIDENTIAL  
Patents Pending  
OZ890  
For 5,6,7,8,9,10,11,12 series Li-ion battery pack applications, the unconnected BC pads  
must be tied to the positive terminal of the highest cell. For example, in an 8 series Li-  
ion battery pack application, all BC9, BC10, BC11, BC12, BC13 must be tied to BC8 of  
the positive terminal of the highest cell8. This example is shown in Figure 3.  
VBAT+  
GND  
BC13  
BC12  
BC11  
BC10  
BC9  
BC8  
BC7  
BC6  
BC5  
BC4  
BC3  
BC2  
BC1  
BC0  
Cell 2  
Cell 1  
Cell 7  
Cell 3  
Cell 8  
Cell 6  
Cell 5  
Cell 4  
Figure 3  
In order to maintain a low impedance ground/power connection back to the battery pack  
ground/power, it is usually necessary to use wide and short traces/wiring to reduce  
ground bounce and power bounce which are caused by the power/ground wire parasitic  
resistor and inductor, when the load current changes rapidly. The trace resistance  
between the negative terminal of the lowest cell1 and the GND of the board should be  
less than 5 mOhms at 300A short circuit high current for OZ890 chip application.  
The final step of battery pack assembly is connecting cells to a PCB board with OZ890  
protection and monitor chip.  
The procedure must be performed in the following sequence:  
1. Connect GND and BC0 of board to negative terminal of lowest cell 1  
2. Connect VBAT+ and BC13 of board to positive terminal of highest cell 13  
3. Connect positive terminal of cell 1 to BC1 of board  
4. Connect positive terminal of cell 2 to BC2 of board  
5. Connect positive terminal of cell 3 to BC3 of board  
6. Connect positive terminal of cell 4 to BC4 of board  
7. Connect positive terminal of cell 5 to BC5 of board  
8. Connect positive terminal of cell 6 to BC6 of board  
9. Connect positive terminal of cell 7 to BC7 of board  
10. Connect positive terminal of cell 8 to BC8 of board  
11. Connect positive terminal of cell 9 to BC9 of board  
12. Connect positive terminal of cell 10 to BC10 of board  
13. Connect positive terminal of cell 11 to BC11 of board  
14. Connect positive terminal of cell 12 to BC12 of board  
After the cells have been connected to the PCB board, sOZ890 will start up only after  
one low pulse of RSTN pin is detected.  
Note: To ensure system reliability after cell assembly, after OZ890 battery assembly  
and power up, please set bit 5 “rstn_bypass” in EE register 32h to “1”. This ensures that  
the OZ890 can start up without one low pulse of RSTN. Setting this bit lets OZ890 know  
03/22/07  
Copyright © 2005-07 by O2Micro  
Patents Pending  
OZ890_AN1_v0.6  
All Rights Reserved  
Page 2  
CONFIDENTIAL  

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