BQ27621-G1_16 Datasheet, PDF (8/26 Pages) Texas Instruments – System-Side Fuel Gauge With Dynamic Voltage Correlation

bq27621-G1
SLUSBB3E – DECEMBER 2013 – REVISED JANUARY 2016
8 Detailed Description
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8.1 Overview
The bq27621-G1 battery fuel gauge accurately predicts the battery capacity and other operational characteristics
of a single Li-based rechargeable cell. It can be interrogated by a system processor to provide cell information
such as State of Charge (%) and Remaining Capacity (mAh). The device is preconfigured with three battery
profiles. The default profile is for standard LiCoO₂-based batteries with a maximum charge voltage of 4.2 V. The
other two profiles that can be selected via I²C commands are for batteries with charging voltages of 4.3 V and
4.35 V.
Unlike some other fuel gauges, the bq27621-G1 fuel gauge cannot be programmed with specific battery
chemistry profiles. For many battery types and applications, the predefined standard chemistry profiles available
in the bq27621-G1 fuel gauge are sufficient matches from a gauging perspective.
NOTE
Formatting conventions used in this document:
Commands: italics with parentheses and no breaking spaces, for example:
RemainingCapacity()
Data Memory Configuration Parameter: italics, bold, and breaking spaces, for example:
Design Capacity
Register bits and flags: brackets and italics, for example: [ITPOR]
Data Memory Configuration Parameter bits: brackets, italics and bold, for example: [BIE]
Modes and states: ALL CAPITALS, for example: UNSEALED mode
8.2 Functional Block Diagram
SCL
I²C
Bus
SDA
ADC
BAT
CPU
GPOUT
BIN
VDD
1.8 V
0.47 µF
LDO
VSS
PACKP
T
1 µF
PACKN
Battery Pack
Protection
IC
Li-Ion
Cell
NFET NFET
8
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