Texas Instruments Impedance Track BQ28Z610 Manual

BQ28Z610 Impedance Track™ Gas Gauge and Protection Solution
for 1-Series to 2-Series Cell Li-Ion Battery Packs

1 Features

• Autonomous battery charging control, using a
dedicated MASTER mode I
• Cell balancing with an internal bypass to optimize
battery health
• A high-side protection N-CH FET drive enables
serial bus communication during fault conditions
• Programmable protection levels for voltage,
current, and temperature
• Analog front-end with two independent ADCs
– Support for simultaneous current and voltage
sampling
– High-accuracy coulomb counter with input
offset error < 1 µV (typical)
• Supports down to 1-mΩ current sense resistor
while capable of 1-mA current measurement
• Supports battery trip point (BTP) function for
Windows ® integration
• SHA-1 authentication responder for increased
battery pack security
2
• 400-kHz I C bus communications interface for
high-speed programming and data access
• Compact 12-pin VSON package (DRZ)

2 Applications

• Tablet computing
• Portable and wearable health devices
• Portable audio devices
– Wireless (Bluetooth) speakers
Pack +
VSS
1
SRN
2
0.1 µF
3 SRP
TS1
4
10k
100 100
5 SCL
Comm
MM3Z5V6C
Bus
100 100
6 SDA
MM3Z5V6C
100 100
Pack–
1 to 10 mΩ
Simplified Schematic
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.
2
C interface
10 M 10 M
Fuse
13
100
VC1
PWPD 12
2 s
0.1 µF
1 µF
1 s
VC2 11
5
5.1 k 5.1 k
PBI 10
2.2 µF
Battery
9 cells
CHG
10
PACK 8
DSG 7
Copyright © 2016 , Texas Instruments Incorporated
SLUSAS3D – APRIL 2014 – REVISED JUNE 2021

3 Description

The Texas Instruments BQ28Z610 device is a highly
integrated, accurate, 1-series to 2-series cell gas
gauge and protection solution, enabling autonomous
charger control and cell balancing.
The BQ28Z610 device enables autonomous charge
control through Master Mode I
charging current and voltage information, eliminating
software overhead that is typically incurred by the
system's host controller.
The BQ28Z610 device provides a fully integrated
pack-based solution with a flash programmable
custom reduced instruction-set CPU (RISC), safety
protection, and authentication for 1-series to 2-series
cell Li-ion and Li-polymer battery packs.
The BQ28Z610 gas gauge communicates through
2
an I C compatible interface and combines an
ultra-low-power, high-speed TI BQBMP processor,
high-accuracy analog
integrated flash memory, an array of peripheral
and communication ports, an N-CH FET drive, and
a SHA-1 Authentication transform responder into
a complete, high-performance battery management
solution.
Device Information
(1)
PART NUMBER PACKAGE
BQ28Z610 VSON (12)
(1) For all available packages, see the orderable addendum at
the end of the data sheet.
Battery
Gauge Charger
Pack Side
2 I C
Power
Wireless (Bluetooth) Speaker Application
Block Diagram
BQ28Z610
2
C broadcasts of
measurement capabilities,
BODY SIZE (NOM)
4 mm × 2.5 mm
Audio
Boost Converter
Power Amp
Audio Processor
MCU
System Side
Copyright © 2017, Texas Instruments Incorporated