BQ27421-G1 Datasheet, PDF (3/20 Pages) Texas Instruments – System-Side Impedance Track™ Fuel Gauge With Integrated Sense Resistor

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PIN DIAGRAM AND PACKAGE DIMENSIONS
(TOP VIEW)
C3
C2
C1
D
B3
B2
B1
A3
A2
A1
(BOTTOM VIEW)
C1
C2
C3
B1
B2
B3
A1
A2
A3
bq27421-G1
SLUSB85 – MAY 2013
E
DIM
MIN
D
1550
E
1590
Pin A1
Index Area
TYP
1580
1620
MAX
1610
1650
UNITS
m
PIN
NAME
NO.
BAT
C3
VDD
B3
VSS
SRX
GPOUT
SDA
SCL
BIN
B2, C1
C2
A1
A2
A3
B1
TYPE ⁽¹⁾
PI, AI
PO
PI
AI
DO
DIO
DIO
DI
PIN FUNCTIONS
DESCRIPTION
LDO regulator input, battery voltage input, and coulomb counter input typically connected to the PACK+ terminal.
1.8V Regulator Output. Decouple with 0.47μF ceramic capacitor to Vss. This pin is not intended to provide power
for other devices in the system.
Ground pins. The center pin B2 is the actual device ground pin while pin C1 is floating internally and 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 the center pin B2 to the corner pin C1 using a top-layer metal trace on the board. Then route
the corner pin C1 to the board ground plane.
Integrated high-side sense resistor and coulomb counter input typically connected to system power rail VSYS.
General Purpose open-drain output. May be configured as a Battery Low indicator or perform SOC interrupt
(SOC_INT) function.
Slave I²C serial bus for communication with system (Master). Open-drain pins. Use with external 10kΩ pull-up
resistors (typical) for each pin. If the external pull-up resistors will be disconnected from these pins during normal
operation, recommend using external 1MΩ pull-down resistors to VSS at each pin to avoid floating inputs.
Battery-insertion detection input. A logic high to low transition is detected as a battery insertion event. Recommend
using a pull-up resistor >1MΩ (1.8 MΩ typical) to V_CC for reduced power consumption. An internal pull-up resistor
option is also available.
(1) I/O = Digital input/output, IA = Analog input, P = Power connection
Copyright © 2013, Texas Instruments Incorporated
Product Folder Links: bq27421-G1
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