BQ27621-G1_16 Datasheet, PDF (3/26 Pages) Texas Instruments – System-Side Fuel Gauge With Dynamic Voltage Correlation

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5 Device Comparison Table
bq27621-G1
SLUSBB3E – DECEMBER 2013 – REVISED JANUARY 2016
PART NUMBER
bq27621YZFR-G1
BATTERY
TYPE
LiCoO₂
(4.2 V maximum charge)
LiCoO₂
(4.3 V maximum charge)
LiCoO₂
(4.35 V maximum charge)
CHEM_ID
(1)
0x1202
0x1210
0x354
FIRMWARE
VERSION ⁽²⁾
1.05
(0x0105)
PACKAGE
(3)
CSP-9
COMMUNICATION
FORMAT
I²C
(1) See the CHEM_ID subcommand to confirm the battery chemistry type. See Alternate Chemistry Selection to select different chemistries.
(2) See the FW_VERSION subcommand to confirm the firmware version.
(3) For the most current package and ordering information see the Package Option Addendum at the end of this document; or, see the TI
website at www.ti.com.
6 Pin Configurations and Functions
(TOP VIEW)
(BOTTOM VIEW)
C3
C2
C1
B3
B2
B1
A3
A2
A1
C1
C2
C3
B1
B2
B3
A1
A2
A3
Pin A1
Index Area
PIN
NAME
NO.
BAT
C2, C3
BIN
B1
GPOUT
A1
SCL
SDA
VDD
VSS
A3
A2
B3
B2, C1
Pin Functions
TYPE ⁽¹⁾
DESCRIPTION
PI, AI
DI
DO
DIO
DIO
PO
PI
LDO regulator input and battery voltage input. Connect to positive battery connector. For highest accuracy, use a Kelvin
connection by directly routing to the PACK+ pin and minimizing current flow through the trace. Connect a capacitor (1 µF)
between BAT and V_SS. Place the capacitor close to gauge.
Battery insertion detection input. If Operation Configuration bit [BIE] = 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 [BIE] = 1 and use a 10-kΩ
pulldown resistor from BIN to V_SS. If [BIE] = 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 the bq27621 V_DD and not an external voltage rail.
This open-drain output can be configured to indicate BAT_LOW when the Operation Configuration [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, so 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 MSU.
Slave I²C serial communications clock input line for communication with system (Master). Use with 10-kΩ pullup resistor
(typical).
Slave I²C serial communications data line for communication with system (Master). Open-drain I/O. Use with 10-kΩ pullup
resistor (typical).
1.8-V Regulator Output. Decouple with 0.47-μF ceramic capacitor to V_SS.
Ground pins. B2 is the actual device ground pin while C1 is floating internally. Therefore, C1 may be used as a bridge to
connect to the board ground plane without requiring a via under the device package. Recommend routing B2 to C1 using a
top-layer metal trace on the board. Connect to negative battery connector. For highest accuracy, use a Kelvin connection by
directly routing to the PACK– pin and minimizing current flow through the trace.
(1) IO = Digital input-output, IA = Analog input, P = Power connection
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