Texas Instruments BQ769142, Manual

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7.20 Cell Balancing
Typical values stated where T
A
= 25°C and V
BAT
= 59.2 V, min/max values stated where T
A
= -40°C to 85°C and V
BAT
= 4.7 V
to 80 V (unless otherwise noted)
(1)
PARAMETER TEST CONDITIONS MIN TYP MAX UNIT
R
(CB)
Internal cell balancing resistance
(2)
R
DS(ON)
for internal FET switch at V
VC(n)
-
V
VC(n-1)
= 1.5V, 1 ≤ n ≤ 14, V
BAT
≥ 4.7 V
15 28 46 Ω
(1) Operation with V
BAT
up to 80 V is supported when the charge pump is not in operation. Whenever the charge pump is in operation (in
5.5 V or 11 V mode), the maximum voltage on V
BAT
should be reduced to ensure the voltage on CP1, CHG, and DSG does not exceed
their maximum specified voltage.
(2) Cell balancing must be controlled to limit the current based on the absolute maximum allowed current, and to avoid exceeding the
recommended device operating temperature. This can be accomplished by appropriate sizing of the offchip cell input resistors and
limiting the number of cells that can be balanced simultaneously.
7.21 Cell Open Wire Detector
Typical values stated where T
A
= 25°C and V
BAT
= 59.2 V, min/max values stated where T
A
= -40°C to 85°C and V
BAT
= 4.7 V
to 80 V (unless otherwise noted)
(1)
PARAMETER TEST CONDITIONS MIN TYP MAX UNIT
I
(OW)
Internal cell open wire check current from
VCx pin to VSS, 1 ≤ x ≤ 14 VCx > VSS + 0.8 V, 1 ≤ x ≤ 4; VCx > VSS
+ 2.8 V, 5 ≤ x ≤ 14
22 54 95 µA
(1) Operation with V
BAT
up to 80 V is supported when the charge pump is not in operation. Whenever the charge pump is in operation (in
5.5 V or 11 V mode), the maximum voltage on V
BAT
should be reduced to ensure the voltage on CP1, CHG, and DSG does not exceed
their maximum specified voltage.
7.22 Internal Temperature Sensor
Typical values stated where T
A
= 25°C and V
BAT
= 59.2 V, min/max values stated where T
A
= -40°C to 85°C and V
BAT
= 4.7 V
to 80 V (unless otherwise noted)
(1)
PARAMETER TEST CONDITIONS MIN TYP MAX UNIT
V
(TEMP)
Internal temperature sensor voltage drift ΔV
BE
measurement 0.410 mV/°C
(1) Operation with V
BAT
up to 80 V is supported when the charge pump is not in operation. Whenever the charge pump is in operation (in
5.5 V or 11 V mode), the maximum voltage on V
BAT
should be reduced to ensure the voltage on CP1, CHG, and DSG does not exceed
their maximum specified voltage.
7.23 Thermistor Measurement
Typical values stated where T
A
= 25°C and V
BAT
= 59.2 V, min/max values stated where T
A
= -40°C to 85°C and V
BAT
= 4.7 V
to 80 V (unless otherwise noted)
(1)
PARAMETER TEST CONDITIONS MIN TYP MAX UNIT
R
(TS_PU)
Internal pullup
resistance
(2)
Setting for nominal 18-kΩ 14.4 18.3 21.6 kΩ
Setting for nominal 180-kΩ 140 178 216 kΩ
R
(TS_PAD)
Internal pad
resistance
(3)
526 Ω
R
(TS_PU_DRIFT)
Internal pullup
resistance change
over temperature
Change over -40°C/+85°C vs value at 25°C
for nominal 18-kΩ
±200 Ω
Change over -40°C/+85°C vs value at 25°C
for nominal 180-kΩ
±2000 Ω
(1) Operation with V
BAT
up to 80 V is supported when the charge pump is not in operation. Whenever the charge pump is in operation (in
5.5 V or 11 V mode), the maximum voltage on V
BAT
should be reduced to ensure the voltage on CP1, CHG, and DSG does not exceed
their maximum specified voltage.
(2) The internal pullup resistance includes only the resistance between the REG18 pin and the point where the voltage is sensed by the
ADC.
(3) The internal pad resistance includes the resistance between the point where the voltage is sensed by the ADC and the pin where an
external thermistor is attached (which includes the TS1, TS2, TS3, ALERT, CFETOFF, DFETOFF, HDQ, DCHG, and DDSG pins)
BQ769142
SLUSE91A – SEPTEMBER 2020 – REVISED FEBRUARY 2021
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