bq76920 monitor Datasheet

bq76920 Datasheet PDF, Equivalent


Part Number

bq76920

Description

3-series to 15-series cell battery monitor

Manufacture

etcTI

Total Page 30 Pages
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Download bq76920 Datasheet PDF


bq76920
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bq76920, bq76930, bq76940
SLUSBK2H – OCTOBER 2013 – REVISED MARCH 2019
bq769x0 3-series to 15-series cell battery monitor family
for li-ion and phosphate applications
1 Features
• 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 absolute maximum (up to
108 V)
– Simple I2C compatible interface (CRC option)
– Random cell connection tolerant
2 Applications
• Light electric vehicles (LEV): eBikes, eScooters,
pedelec, and pedal-assist bicycles
• Power tools and garden tools
• Battery backup units (BBUS), energy storage
systems (ESS) and uninterruptible power supply
(UPS) systems
• Wireless base station backup systems
• 12-V, 18-V, 24-V, 36-V, and 48-V industrial 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 or 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.
The bq76920 device supports up to 5-series cells or
typical 18-V packs, the bq76930 handles up to 10-
series cells or typical 36-V packs, and the bq76940
works for up to 15-series cells or typical 48-V packs.
A variety of battery chemistries may be managed with
these AFEs, including Lithium Ion, Lithium iron
phosphate, and more. Through I2C, a host controller
can use the bq769x0 to implement many battery pack
management functions, such as monitoring (cell
voltages, pack current, pack temperatures),
protection (controlling charge/discharge FETs), and
balancing. Integrated A/D converters enable a purely
digital readout of critical system parameters, with
calibration handled in TI’s manufacturing process.
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.
4 Simplified Schematic
Rc
Cc
Rc
Cc
Rc
Cc
Rc
Cc
Rc Cc
Cc
Rc
VC 5
VC 4
VC 3
VC 2
VC 1
VC 0
SRP
SRN
ALERT
BAT
REGSRC
REGOUT
CAP1
TS1
SCL
SDA
VSS
CHG
DSG
0.1 µF 0.1 µF 0.1 µF
100 100
Rsns
1M
PACK +
Rf
10 kΩ
10k
1 µF 1 µF Cf
4.7 µF
PUSH-BUTTON FOR BOOT
1M
VCC
SCL
SDA
Companion
Controller
GPIO
VSS
1M
PACK–
Copyright © 2016, Texas Instruments Incorporated
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. UNLESS OTHERWISE NOTED, this document contains PRODUCTION
DATA.

bq76920
bq76920, bq76930, bq76940
SLUSBK2H – OCTOBER 2013 – REVISED MARCH 2019
www.ti.com
Table of Contents
1 Features .................................................................. 1
2 Applications ........................................................... 1
3 Description ............................................................. 1
4 Simplified Schematic............................................. 1
5 Revision History..................................................... 2
6 Device Comparison Table..................................... 4
7 Pin Configuration and Functions ......................... 5
7.1 Versions .................................................................... 5
7.2 bq76920 Pin Diagram ............................................... 6
7.3 bq76930 Pin Diagram ............................................... 7
7.4 bq76940 Pin Diagram ............................................... 8
8 Specifications....................................................... 10
8.1 Absolute Maximum Ratings .................................... 10
8.2 ESD Ratings .......................................................... 10
8.3 Recommended Operating Conditions..................... 10
8.4 Thermal Information ................................................ 12
8.5 Electrical Characteristics......................................... 12
8.6 Timing Requirements .............................................. 15
8.7 Typical Characteristics ............................................ 17
9 Specifications....................................................... 18
10 Detailed Description ........................................... 19
10.1 Overview ............................................................... 19
10.2 Functional Block Diagram ..................................... 19
10.3 Feature Description............................................... 20
10.4 Device Functional Modes...................................... 29
10.5 Register Maps ....................................................... 31
11 Application and Implementation........................ 41
11.1 Application Information.......................................... 41
11.2 Typical Applications .............................................. 42
12 Power Supply Recommendations ..................... 48
13 Layout................................................................... 48
13.1 Layout Guidelines ................................................. 48
13.2 Layout Example .................................................... 48
14 Device and Documentation Support ................. 51
14.1 Documentation Support ........................................ 51
14.2 Related Links ........................................................ 51
14.3 Receiving Notification of Documentation Updates 51
14.4 Community Resources.......................................... 51
14.5 Trademarks ........................................................... 51
14.6 Electrostatic Discharge Caution ............................ 51
14.7 Glossary ................................................................ 51
15 Mechanical, Packaging, and Orderable
Information ........................................................... 52
5 Revision History
NOTE: Page numbers for previous revisions may differ from page numbers in the current version.
Changes from Revision G (April 2016) to Revision H
Page
• Changed Applications............................................................................................................................................................. 1
• Changed the Description ....................................................................................................................................................... 1
• Added High-Side FET Driving .............................................................................................................................................. 26
• Added the link to the bq769x0 Boot Switch Alternatives Application Report ...................................................................... 30
• Added the link to the bq769x0 Family Top Design Considerations Application Report ....................................................... 41
• Added Figure 15 to provide an example of a high-side FET configuration .......................................................................... 45
• Added the link to the bq769x0 Family Top Design Considerations Application Report ....................................................... 48
Changes from Revision F (November 2015) to Revision G
Page
• Changed Electrical Characteristics table to clarify the accuracy of the ADC in different temperature ranges .................... 13
Changes from Revision E (November 2014) to Revision F
Page
• Changed bq7693002 From: Product Preview To Production in the Device Comparison Table ............................................ 4
• Added bq7693007 device to the Device Comparison Table .................................................................................................. 4
• Changed table note to group ground reference in bq76930 Pin Functions ........................................................................... 7
• Changed table note to group ground reference in bq76940 Pin Functions ........................................................................... 8
• Changed 10th cell to 11th cell in the Description of pin 29 ................................................................................................... 9
• Changed table formats for online data sheet ...................................................................................................................... 10
• Changed Handing Ratings table to ESD Ratings................................................................................................................. 10
• Changed note for R1 on Figure 8......................................................................................................................................... 26
2 Submit Documentation Feedback
Copyright © 2013–2019, Texas Instruments Incorporated
Product Folder Links: bq76920 bq76930 bq76940


Features Product Folder Order Now Technical Doc uments Tools & Software Support & Com munity bq76920, bq76930, bq76940 SLUSB K2H – OCTOBER 2013 – REVISED MARCH 2019 bq769x0 3-series to 15-series cel l battery monitor family for li-ion and phosphate applications 1 Features • AFE monitoring features – Pure digit al interface – Internal ADC measures cell voltage, die temperature, and exte rnal thermistor – A separate, interna l ADC measures pack current (coulomb co unter) – Directly supports up to thre e thermistors (103AT) • Hardware prot ection features – Overcurrent in Disc harge (OCD) – Short Circuit in Discha rge (SCD) – Overvoltage (OV) – Unde rvoltage (UV) – Secondary protector f ault detection • Additional features – Integrated cell balancing FETs – Charge, discharge low-side NCH FET driv ers – Alert interrupt to host microco ntroller – 2.5-V or 3.3-V output volt age regulator – No EEPROM programming necessary – High supply voltage absolute maximum (up to 108 V) – Simple I2C compatible interface (CR.
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