BQ27742-G1 Datasheet, PDF (1/46 Pages) Texas Instruments – Single-Cell Li-Ion Battery Fuel Gauge with Programmable Hardware Protection

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bq27742-G1
SLUSBV9C – MARCH 2014 – REVISED FEBRUARY 2016
bq27742-G1 Single-Cell Li-Ion Battery Fuel Gauge
with Programmable Hardware Protection
1 Features
•1 Battery Fuel Gauge and Protector for Single-Cell
Li-Ion Applications
• Microcontroller Peripheral Provides:
– Precision 16-Bit, High-Side Coulomb Counter
with Low-Value Sense Resistor
(5 mΩ to 20 mΩ)
– External and Internal Temperature Sensors for
Battery Temperature Reporting
– Lifetime and Current Data Logging
– 64 Bytes of Non-Volatile Scratch Pad Flash
– SHA-1 Authentication Capability
• Battery Fuel Gauging Based on Patented
Impedance Track™ Technology
– Models Battery Discharge Curve for Accurate
Time-To-Empty Predictions
– Automatically Adjusts for Aging, Self-
Discharge, and Temperature- and Rate-
Induced Effects on Battery
• Integrated High-side NMOS Protection FET Drive
• Hardware-based Safety and Protection:
– Overvoltage (OVP)
– Undervoltage (UVP)
– Overcurrent in Charge (OCC)
– Overcurrent in Discharge (OCD)
– Short-Circuit in Discharge (SCD)
• I²C™ and HDQ Interface Formats for
Communication with Host System
• Ultra-Compact, 15-Ball NanoFree™ DSBGA
2 Applications
• Smartphones
• Tablets
• Handheld Terminals
• MP3 and Multimedia Players
• Portable Gaming
3 Description
The Texas Instruments bq27742-G1 is a fuel gauge
for single-cell Li-Ion battery packs that uses patented
Impedance Track™ technology to deliver rate-,
temperature-, and aging-compensated predictions of
remaining battery capacity and system runtime with
highest accuracy. The device also includes a fully
integrated high-side protector that eliminates the
need for a separate Li-Ion protection circuit and
provides a full suite of high-accuracy fault detections
for overvoltage, undervoltage, overcurrent in charge,
overcurrent in discharge, and short-circuit in
discharge conditions. The hardware protection
functions offer built-in data flash-based
programmability, allowing simple reconfiguration of
existing devices for varying end equipment needs.
The fuel gauge provides information such as
remaining battery capacity (mAh), state-of-charge
(%), runtime to empty (minutes), voltage (mV),
current (mA), and temperature (°C), as well as
recording vital parameters throughout the lifetime of
the battery. The device also supports interrupts to the
host to indicate detection of a variety of important
battery conditions to the system.
The DSBGA is a 15-ball package (2.78 mm × 1.96
mm) that is ideal for space-constrained applications.
Device Information⁽¹⁾
PART NUMBER
PACKAGE
BODY SIZE (NOM)
BQ27742YZFR-G1
YZF (15)
BQ27742YZFT-G1
2.78 mm × 1.96 mm
(1) For all available packages, see the orderable addendum at
the end of the data sheet.
VBAT
RVPWR
RBAT
CREG25
R THERM
CTHERM
Simplified Schematic
R SENSE
VPACK
CBAT
C VPWR
VPWR
SRN
BAT
SRP
REG25 PACKP
TS
CHG
NC
DSG
RC2
SDA
VSS
SCL
HDQ
RSRN
RSRP
C SRN C_SRP
CDIFF
RCHG
RDSG
R PACKP
SDA
SCL
CPACKP
1
An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications,
intellectual property matters and other important disclaimers. PRODUCTION DATA.