Datasheet

bq76925
SLUSAM9B –JULY 2011– REVISED DECEMBER 2011 www.ti.com
ELECTRICAL CHARACTERISTICS
BAT = 4.2 to 26.4 V, VCn = 1.4 to 4.4, T
A
= –25°C to 85°C
Typical values stated where T
A
= 25°C and BAT= 21.6 V (unless otherwise noted)
Supply Current
PARAMETER TEST CONDITION MIN TYP MAX UNIT
All device functions enabled
I
DD1
Normal mode supply current All pins unloaded 40 48 µA
SDA and SCL high
V3P3 and overcurrent monitor enabled
All pins unloaded
I
DD2
Standby mode 1 supply current 14 17 µA
All other device functions disabled
SDA and SCL high
V3P3 enabled
All pins unloaded
I
DD3
Standby mode 2 supply current 12 14 V
All device functions disabled
SDA and SCL high
V3P3 disabled
All pins unloaded
I
DD4
Sleep mode supply current 1.0 1.5 µA
All device functions disabled
SDA and SCL low
All cell voltages equal n = 6 2.4 2.7
Cell balancing disabled
I
VCn
Input current for selected cell µA
Open cell detection disabled
n = 1 – 5 < 0.5
during cell voltage monitoring
All cell voltages equal
∆I
VCn
Cell to cell input current difference Cell balancing disabled < 0.2 µA
Open cell detection disabled
Internal Power Control (Startup and Shutdown)
PARAMETER TEST CONDITION MIN TYP MAX UNIT
Initial BAT < 1.4
4.3 4.5 4.7 V
VBAT rising
(1)
V
POR
Power on reset voltage Measured at BAT pin
Initial BAT > 1.4
6.5 7.0 7.5 V
VBAT rising
(1)
V
SHUT
Shutdown voltage
(2)
Measured at BAT pin, BAT falling 3.6 V
Time delay after POR before I2C
t
POR
CV3P3 = 4.7 µF 1 ms
comms allowed
V
WAKE
Wakeup voltage Measured at ALERT pin 0.8 2 V
t
WAKE_PLS
Wakeup signal pulse width 1 5 μs
Time delay after wakeup before
t
WAKE_DLY
CV3P3 = 4.7 µF 1 ms
I2C comms allowed
(1) Initial power up will start with BAT < 1.4 V, however if BAT falls below V
SHUT
after rising above V
POR
, the power on threshold depends
on the minimum level reached by BAT after falling below V
SHUT
(2) Following POR, the device will operate down to this voltage.
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