Data Sheet

GPOUT
BIN
bq27441-G1
SLUSBH1C –NOVEMBER 2013–REVISED DECEMBER 2014 www.ti.com
7 Pin Configuration and Functions
Pin Functions
PIN
TYPE
(1)
DESCRIPTION
NAME NUMBER
LDO regulator input and battery voltage measurement input. Kelvin sense connect to positive
BAT 6 PI, AI battery terminal (PACKP). Connect a capacitor (1 µF) between BAT and V
SS
. Place the capacitor
close to the gauge.
Battery insertion detection input. If OpConfig [BI_PU_EN] = 1 (default), a logic low on the pin is
detected as battery insertion. For a removable pack, the BIN pin can be connected to V
SS
through a pulldown resistor on the pack, typically the 10-kΩ thermistor; the system board should
use a 1.8-MΩ pullup resistor to V
DD
to ensure the BIN pin is high when a battery is removed. If
the battery is embedded in the system, it is recommended to leave [BI_PU_EN] = 1 and use a
BIN 10 DI
10-kΩ pulldown resistor from BIN to V
SS
. If [BI_PU_EN] = 0, then the host must inform the gauge
of battery insertion and removal with the BAT_INSERT and BAT_REMOVE subcommands. A 10-
kΩ pulldown resistor should be placed between BIN and V
SS
, even if this pin is unused.
NOTE: The BIN pin must not be shorted directly to V
CC
or V
SS
and any pullup resistor on the BIN
pin must be connected only to V
DD
and not an external voltage rail.
This open-drain output can be configured to indicate BAT_LOW when the OpConfig
[BATLOWEN] bit is set. By default [BATLOWEN] is cleared and this pin performs an interrupt
function (SOC_INT) by pulsing for specific events, such as a change in state-of-charge. Signal
GPOUT 12 DO polarity for these functions is controlled by the [GPIOPOL] configuration bit. This pin should not
be left floating, even if unused; therefore, a 10-kΩ pullup resistor is recommended. If the device
is in shutdown mode, then toggling GPOUT will make the gauge exit shutdown. Therefore, it is
recommended to connect GPOUT to a GPIO of the host MCU.
NC 4, 9, 11 — No internal connection. May be left floating or tied to V
SS
.
SCL 2 DIO Slave I
2
C serial bus for communication with system (Master). Open-drain pins. Use with external
10-kΩ pullup resistors (typical) for each pin. If the external pullup resistors will be disconnected
from these pins during normal operation, recommend using external 1-MΩ pulldown resistors to
SDA 1 DIO
V
SS
at each pin to avoid floating inputs.
SRN 7 AI Coulomb counter differential inputs expecting an external 10 mΩ, 1% sense resistor in the high-
side current path. Kelvin sense connect SRP to the positive battery terminal (PACKP) side of the
external sense resistor. Kelvin sense connect SRN to the other side of the external sense
SRP 8 AI
resistor, the positive connection to the system (VSYS). See the Simplified Schematic. No
calibration is required. The fuel gauge is pre-calibrated for a standard 10 mΩ, 1% sense resistor.
1.8-V regulator output. Decouple with 0.47-μF ceramic capacitor to V
SS
. This pin is not intended
V
DD
5 PO
to provide power for other devices in the system.
V
SS
3 PI Ground pin
(1) IO = Digital input-output, AI = Analog input, P = Power connection
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