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| BQ2947_17 Datasheet, PDF (14/27 Pages) Texas Instruments – Overvoltage Protection for 2-Series to 4-Series Cell Li-Ion Batteries with External Delay Capacitor | |||
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bq2947
SLUSB15F â SEPTEMBER 2012 â REVISED JANUARY 2017
www.ti.com
NOTE
The device is calibrated using an RIN value = 1 kΩ. Using a value other than this
recommended value changes the accuracy of the cell voltage measurements and VOV
trigger level.
9.2.1.2 Detailed Design Procedure
1. Determine the number of cell in series.
The device supports 2-S to 4-S cell configuration. For 2S and 3S, the top unused pin(s) should be shorted as
shown in Figure 13 and Figure 14.
2. Determine the overvoltage protection delay.
Follow the calculation example described in CD pin description. Select the right capacitor to connect to the
CD pin.
3. Follow the application schematic to connect the device. If the OUT pin is configured to open drain, an
external pull up resistor should be used.
100 Ω
VCELL2
VCELL1
VDD
V4
V3
1k 0.1µF
V2
1k
0.1µF
PWPD
OUT
CD
VSS
V1
0.1µF
0.1µF 0.1µF
Figure 13. 2-Series Cell Configuration
Pack+
Packâ
100 Ω
VCELL3
VCELL2
VCELL1
VDD
V4
1k
V3
1k 0.1µF
V2
1k
0.1µF
PWPD
OUT
CD
VSS
V1
0.1µF
0.1µF 0.1µF
Figure 14. 3-Series Cell Configuration
Pack+
Packâ
14
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