bq2056/T/V
SNS
BAT
Current sense input
Pin Descriptions:
Battery current is sensed via the voltage
developed on this pin by an external sense-
resistor, connected in series with the nega-
tive terminal of the battery pack.
INH
Charge-inhibit input
When input to this pin is high, the bq2056
suspends the charge in progress and places
the device in sleep mode. When input is low,
the bq2056 resumes operation.
Battery voltage input
This is the battery voltage sense input. It is
tied directly to the positive side of the bat-
tery pack on bq2056 and bq2056T versions.
A simple resistive divider is required to
generate this input for bq2056V.
TRKL
Trickle-charge interface output
This output is driven low if the battery volt-
age is less than an internal threshold level
and INH is low. This open-drain output can
enable an external trickle charger to revive a
deeply discharged battery.
CC
Charge-control output
CC is an open-collector output that is used
to control the charging current to the bat-
tery.
VSS
Ground
COMP
Charge-rate compensation input
VCC
VCC supply input
This input is used to set the charge-rate
compensation level. The voltage regulation
output may be programmed to vary as a
function of the charge current delivered to
the battery. This feature, called AutoComp,
provides compensation for internal cell im-
pedance and voltage drops in protection
circuitry and therefore may be used to
safely reduce charging time. Connecting
this pin to VSS disables the AutoComp fea-
ture.
2
TI [ TEXAS INSTRUMENTS ]
