JAJSHE9G october 2015 – april 2023 BQ27426
PRODUCTION DATA
PIN | TYPE(1) | DESCRIPTION | |
---|---|---|---|
NAME | NUMBER | ||
BAT | C3 | PI, AI | LDO regulator input and battery voltage measurement input. Kelvin sense connect to positive battery terminal (PACKP). Connect a capacitor (1 µF) between BAT and VSS. Place the capacitor close to the gauge. |
BIN | B1 | DI | 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 VSS
through a pulldown resistor on the pack, typically the 10-kΩ
thermistor; the system board should use a 1.8-MΩ pullup resistor to
VDD 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 10-kΩ pulldown
resistor from BIN to VSS. 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 VSS, even if this pin is unused. NOTE: The BIN pin must not be shorted directly to VCC or VSS and any pullup resistor on the BIN pin must be connected only to VDD and not an external voltage rail. If an external thermistor is used for temperature input, the thermistor should be connected between this pin and VSS. |
GPOUT | A1 | DO | 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 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,
toggling GPOUT
causes
the gauge exit SHUTDOWN. Connect GPOUT to a GPIO of the host MCU so that in case of any inadvertent shutdown condition, the gauge can be commanded to come out of SHUTDOWN. |
SCL | A3 | DIO | Slave I2C 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, use an external 1-MΩ pulldown resistors to VSS at each pin to avoid floating inputs. |
SDA | A2 | DIO | |
SRN | C2 | 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 resistor, the positive connection to the system (VSYS). No
calibration is required. The fuel gauge is precalibrated for a
standard 10 mΩ, 1% sense resistor. Low-side current sensing can be enabled. For more information, see Typical Applications. |
SRP | C1 | AI | |
VDD | B3 | PO | 1.8-V regulator output. Decouple with 2.2-μF ceramic capacitor to VSS. This pin is not intended to provide power for other devices in the system. |
VSS | B2 | PI | Ground pin |