BQ29311_15 Datasheet, PDF (16/24 Pages) Texas Instruments – FOUR-CELL LITHIUM-ION

Not Recommended for New Designs
bq29311
SLUS487D − DECEMBER 2001 − REVISED NOVEMBER 2003
www.ti.com
OCD: OVERCURRENT/OVERLOAD BLANKING DELAY
7
OCDC3
6
OCDC2
5
OCDC1
OCD REGISTER (0X05)
4
3
OCDC0
OCDD3
2
OCDD2
1
OCDD1
0
OCDD0
This register is used to set the overcurrent and overload delay times.
OCD b0−b3 (OCDD0−OCDD3): These four bits select the value of the delay time for overcurrent triggering in the discharge
direction. 0000 is the default.
OCD b3...b0 With Corresponding Delay Time
0000
0001
0010
0011
1 ms
3 ms
5 ms
7 ms
0100
0101
0110
0111
9 ms
11 ms
13 ms
15 ms
1000
1001
1010
1011
17 ms
19 ms
21 ms
23 ms
1100
1101
1110
1111
25 ms
27 ms
29 ms
31 ms
OCD b4−b7 (OCDC0−OCDC3): These four bits select the value of the delay time for overcurrent triggering in the charge
direction. 0000 is the default.
OCD b7...b4 With Corresponding Delay Time
0000
1 ms
0100
9 ms
0001
3 ms
0101
11 ms
0010
5 ms
0110
13 ms
0011
7 ms
0111
15 ms
1000
1001
1010
1011
17 ms
19 ms
21 ms
23 ms
1100
1101
1110
1111
25 ms
27 ms
29 ms
31 ms
SCV: SHORT-CIRCUIT THRESHOLD VOLTAGE
SCV REGISTER (0X07)
7
6
5
4
3
2
1
0
−
−
−
−
SCV3
SCV2
SCV1
SCV0
This register selects the common short-circuit threshold voltage for both charge and discharge.
SCV b0−b3 (SCV0−SCV3): These four bits select the value of the short-circuit voltage threshold for both charge and
discharge. 0000 is the default.
SCV b0...b3 With Corresponding Threshold Voltage
0000
0001
0010
0011
0.10V
0.125V
0.150V
0.175V
0100
0101
0110
0111
0.20V
0.225V
0.250V
0.275V
1000
1001
1010
1011
0.30V
0.325V
0.350V
0.375V
1100
1101
1110
1111
0.40V
0.425V
0.450V
0.475V
SCD: SHORT-CIRCUIT BLANKING DELAY
7
SCDC3
6
SCDC2
5
SCDC1
SCD REGISTER (0X08)
4
3
SCDC0
SCDD3
2
SCDD2
1
SCDD1
0
SCDD0
This register selects the short-circuit blanking delay time for charge and discharge.
SCD b0−b3 (SCDD0−SCDD3): These four bits select the value of the short-circuit delay time for discharge. Exceeding
the short-circuit voltage threshold for longer than this period turns off the DSG output. 0000 is the default.
SCD b3...b0 With Corresponding Delay Time
0000
0 µs
0100
244 µs
0001
61 µs
0101
305 µs
0010
122 µs
0110
366 µs
0011
183 µs
0111
427 µs
1000
1001
1010
1011
488 µs
549 µs
610 µs
671 µs
1100
1101
1110
1111
732 µs
793 µs
854 µs
915 µs
SCD b4−b7 (SCDC0−SCDC3): These four bits select the value of the short-circuit delay time for charge. Exceeding the
short-circuit voltage threshold for longer than this period turns off the CHG output.
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