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Rc
Rc
Rc
Rc
Rsns
Cc
Cc
Cc
Cc
Cc
100
0.1 µF
4.7 µF
BAT
VC5
VC4
VC3
VC2
VC1
VSS
SCL
SDA
CHG
DSG
REGSRC
REGOUT
SRN
SRP
VC0
CAP1
TS1
Cf
100
0.1 µF
1 µF
Rc
Rf
1M1M
Rc
10k
ALERT
1M
PUSH- BUTTON FOR BOOT
VCC
GPIO
SDA
SCL
VSS
Cc
1 µF
0.1 µF
10 kΩ
PACK +
PACK–
Companion
Controller
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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. UNLESS OTHERWISE NOTED, this document contains PRODUCTION
DATA.
bq76920, bq76930, bq76940
SLUSBK2G –OCTOBER 2013–REVISED MAY 2016
bq769x0 3-Series to 15-Series Cell Battery Monitor Family
for Li-Ion and Phosphate Applications
1 Introduction
1.1 Features
1
1
• AFE Monitoring Features
– Pure digital interface
– Internal ADC measures cell voltage, die
temperature, and external thermistor
– A separate, internal ADC measures pack
current (coulomb counter)
– Directly supports up to three thermistors
(103AT)
• Hardware Protection Features
– Overcurrent in discharge (OCD)
– Short circuit in discharge (SCD)
– Overvoltage (OV)
– Undervoltage (UV)
– Secondary protector fault detection
• Additional Features
– Integrated cell balancing FETs
– Charge, discharge low-side NCH FET drivers
– Alert interrupt to host microcontroller
– 2.5-V or 3.3-V output voltage regulator
– No EEPROM programming necessary
– High supply voltage abs max (up to 108 V)
– Simple I
2
C™ compatible interface (CRC option)
– Random cell connection tolerant
1.2 Applications
• Light Electric Vehicles (LEV): eBikes, eScooters,
Pedelec, and Pedal-Assist Bicycles
• Power and Gardening Tools
• Battery Backup and UPS Systems
• Wireless Base Station Backup Systems
• 12-V, 18-V, 24-V, 36-V, and 48-V Battery Packs
1.3 Description
The bq769x0 family of robust analog front-end (AFE) devices serves as part of a complete
pack monitoring and protection solution for next-generation, high-power systems, such as light electric
vehicles, power tools, and uninterruptible power supplies. The bq769x0 is designed with low power in
mind: Sub-blocks within the IC may be enabled/disabled to control the overall chip current consumption,
and a SHIP mode provides a simple way to put the pack into an ultra-low power state.
Device Information
(1)
PART NUMBER PACKAGE BODY SIZE (NOM)
bq76920 TSSOP (20) 6.50 mm × 4.40 mm
bq76930 TSSOP (30) 7.80 mm × 4.40 mm
bq76940 TSSOP (44) 11.00 mm × 4.40 mm
(1) For all available packages, see the orderable addendum at the end of the data sheet.
1.4 Simplified System Diagram
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