BQ2970 Datasheet, PDF (14/31 Pages) Texas Instruments – Cost-Effective Voltage and Current Protection Integrated Circuit

bq2970, bq2971, bq2972, bq2973
SLUSBU9C – MARCH 2014 – REVISED MARCH 2016
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Test Circuits (continued)
12. DOUT current source when activated High (Test Circuit 4):
Measure I_DOUT current source on DOUT pin by setting the following conditions: V1 = 3.9 V, V2 = 0 V and V3
= 3.4 V.
13. DOUT current sink when activated Low (Test Circuit 4):
Measure I_DOUT current sink on DOUT pin by setting the following conditions: V1 = 2.0 V, V2 = 0 V and V3 =
0.4 V.
14. Overcharge detection delay (Test Circuit 5):
The overcharge detection delay time t_OVPD is the time delay before the COUT drive output transitions from
high to low once the voltage on V1 exceeds the V_OVP threshold. Set V2 = 0 V and then increase V1 until BAT
input exceeds the V_OVP threshold and to check the time for when COUT goes from high to low.
15. Over-discharge detection delay (Test Circuit 5):
The over-discharge detection delay time t_UVPD is the time delay before the DOUT drive output transitions
from high to low once the voltage on V1 decreases to V_UVP threshold. Set V2 = 0 V and then decrease V1
until BAT input reduces to the V_UVPthreshold and to check the time of when DOUT goes from high to low.
16. Discharge overcurrent detection delay (Test Circuit 5):
The discharge overcurrent detection delay time t_OCDD is the time for DOUT drive output to transition from
high to low after the voltage on V2 is increased from 0 V to 0.35 V, with V1 = 3.5 V and V2 starts from 0 V
and increases to trigger threshold.
17. Load short circuit detection delay (Test Circuit 5):
The load short-circuit detection delay time t_SCCD is the time for DOUT drive output to transition from high to
low after the voltage on V2 is increased from 0 V to V1 – 1 V, with V1 = 3.5 V and V2 starts from 0 V and
increases to trigger threshold.
18. Charge overcurrent detection delay (Test Circuit 5):
The charge overcurrent detection delay time t_OCCD is the time for COUT drive output to transition from high to
low after the voltage on V2 is decreased from 0 V to –0.3 V, with V1 = 3.5 V and V2 starts from 0 V and
decreases to trigger threshold.
19. 0-V battery charge starting charger voltage (Test Circuit 2):
The 0-V charge for start charging voltage V_0CHA is defined as the voltage between BAT and V– pins at which
COUT goes high when voltage on V2 is gradually decreased from a condition of V1 = V2 = 0 V.
20. 0-V battery charge inhibition battery voltage (Test Circuit 2):
The 0-V charge inhibit for charger voltage V_0INH is defined as the voltage between BAT and VSS pins at
which COUT should go low as V1 is gradually decreased from V1 = 2 V and V2 = –4 V.
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