BQ27742-G1 Datasheet, PDF (29/46 Pages) Texas Instruments – Single-Cell Li-Ion Battery Fuel Gauge with Programmable Hardware Protection

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8 Application and Implementation
bq27742-G1
SLUSBV9C – MARCH 2014 – REVISED FEBRUARY 2016
NOTE
Information in the following applications sections is not part of the TI component
specification, and TI does not warrant its accuracy or completeness. TI’s customers are
responsible for determining suitability of components for their purposes. Customers should
validate and test their design implementation to confirm system functionality.
8.1 Application Information
The bq27742-G1 is a single-cell fuel gauge with integrated Li-Ion protection circuitry for highly accurate detection
of overvoltage, undervoltage, overcurrent in charge, overcurrent in discharge, and short-circuit in discharge fault
conditions. If the detected fault continues to be present for a specific delay time (pre-configured in the device),
the protection front-end will disable the applicable charge pump circuit, resulting in opening of the FET until the
provoking safety condition resolves. The integrated 16-bit delta-sigma converters provide accurate, high precision
measurements for voltage, current, and temperature in order to accomplish effective battery monitoring,
protection, and gauging. To allow for optimal performance in the end application, special considerations must be
taken to ensure minimization of measurement error through proper printed circuit board (PCB) board layout and
correct configuration of battery characteristics in the fuel gauge data flash. Such requirements are detailed in
Design Requirements.
8.2 Typical Applications
8.2.1 Pack-Side, Single-Cell Li-Ion Fuel Gauge and Protector
0.1 µF 0.1 µF
5 mΩ
200 Ω
200 Ω
PACK+
10 Ω
10 Ω
1 µF
0.1 µF
0.1 µF
10 kΩ
(25°C)
0.47 µF
VPWR
BAT
REG25
TS
NC
RC2
VSS
SRN
SRP
PACKP
CHG
DSG
SDA
SCL
HDQ
0.1 µF 0.1 µF
0.1 µF
1 kΩ
100 Ω
100 Ω
100 Ω
100 Ω
1 kΩ
2 kΩ
0.1 µF
0.1 µF
0.1 µF
SDA
SCL
PACK–
Figure 19. I²C Mode Schematic
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