BQ76942 3-Series to 10-Series High Accuracy Battery Monitor and Protector for
Li-Ion, Li- Polymer, and LiFePO
4
Battery Packs
1 Features
• Battery monitoring capability for 3-series to 10-
series cells
• Integrated charge pump for high-side NFET
protection with optional autonomous recovery
• Extensive protection suite including voltage,
temperature, current, and internal diagnostics
• Two independent ADCs
– Support for simultaneous current and voltage
sampling
– High-accuracy coulomb counter with input
offset error < 1 µV (typical)
– High-accuracy cell voltage measurement
< 10 mV (typical)
• Wide-range current applications (±200-mV
measurement range across sense resistor)
• Integrated secondary chemical fuse drive
protection
• Autonomous or host-controlled cell balancing
• Multiple power modes (typical battery pack
operating range conditions)
– NORMAL mode: 286 µA
– Multiple SLEEP mode options: 24 µA to 41 µA
– Multiple DEEPSLEEP mode options: 9 µA to
10 µA
– SHUTDOWN Mode: 1 µA
• High-voltage tolerance of 85 V on cell connect and
select additional pins
• Tolerant of random cell attach sequence on
production line
• Support for temperature sensing using internal
sensor and up to nine external thermistors
• Integrated one-time-programmable (OTP) memory
programmable by customers on production line
• Communication options include 400-kHz I
2
C, SPI,
and HDQ one-wire interface
• Dual programmable LDOs for external system
usage
• 48-pin TQFP package (PFB)
2 Applications
•
Cordless power tools and garden tools
•
•
•
•
Other industrial battery pack (3-series–10-series)
3 Description
The Texas Instruments BQ76942 is a highly
integrated, high accuracy battery monitor and
protector for 3-series to 10-series Li-ion, Li-polymer,
and LiFePO
4
battery packs. The device includes a
high-accuracy
monitoring
system,
a
highly
configurable protection subsystem, and support
for autonomous or host-controlled cell balancing.
Integration includes high-side charge-pump NFET
drivers, dual programmable LDOs for external system
use, and a host communication peripheral supporting
400-kHz I
2
C, SPI, and HDQ one-wire standards. The
BQ76942 is available in a 48-pin TQFP package.
Device Information
PART NUMBER
PACKAGE
BODY SIZE (NOM)
BQ76942xx
PFB (48-pin)
7 mm × 7 mm
(1)
for information on the
device family. For all available devices, see the orderable
addendum at the end of the data sheet.
PACK-
VDD
COMM
COMM TO
SYSTEM
NC
VC5
NC
VC4
VC7
NC
VC6
NC
VC8
NC
VC9
NC
BRE
G
PCHG
PDSG
P
A
CK
FUSE
V
C10
CHG
DSG
B
A
T
CP1
LD
NC
RE
G18
T
S1
T
S2
NC
T
S3
V
C3
V
C0
SRP
V
C2
V
C1
SRN
V
SS
SDA
REG1
RST_SHUT
DDSG
DCHG
DFETOFF
SCL
REG2
CFETOFF
HDQ
REGIN
ALERT
PACK+
GND
MCU
COMMUNICATIONS
TRANSCEIVER
CHG
DSG
+
+
+
+
+
+
+
+
+
+
3.3V
5V
Simplified Schematic
SLUSE14B – DECEMBER 2020 – REVISED DECEMBER 2021
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.
Summary of Contents for BQ76942
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