TI-BQ79631-Q1.pdf
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BQ79631-Q1 UIR Sensor with Voltage, Current, and Insulation Resistance Monitoring
in EV/BMS HV Automotive Applications
1 Features
• Qualified for automotive applications
• AEC-Q100 Qualified with the following results:
– Device temperature grade 1: –40°C to +125°C
ambient operating temperature range
– Device HBM ESD classification level 2
– Device CDM ESD classification level C4B
• Functional Safety-Compliant
– Developed for functional safety applications
– Documentation to aid ISO 26262 system design
– Systematic capability up to ASIL D
– Hardware capability up to ASIL D
• Differential voltage measurements with integrated
filtering
– Pack+ , Fuse, Link±, Charge± measure
– Isolation resistance voltage measurement
• Integrated precision current measurement
– Support low-side shunt resistor
• Insulation resistance monitoring capability
• 8 GPIO inputs as IO, SPI, ADC, and temperature
sense
• Isolated differential daisy-chain communication
with optional ring architecture
– Simplifies BJB/BDU system by eliminating
safety MCU, CAN transceivers, and multi-wire
interface
• UART host interface
• Synchronized current and voltage measurements
• Stackable as well as syncs with other cell and UI
monitors 16S (BQ79616-Q1, BQ79656-Q1), 14S
(BQ79614-Q1, BQ79654-Q1), 12S (BQ79612-Q1,
BQ79652-Q1) and BQ79631
• Built-in SPI master
2 Applications
• Full Electric, Plug-In Hybrid, and Hybrid Vehicles
3 Description
BQ79631-Q1 provides high-accuracy measurement
capable of measuring divided down voltages from
high voltage nodes such as Pack+ (HV Battery
Positive terminal), Fuse, Charge (Port), Link (Load)
in a battery junction box (BJB) or battery disconnect
unit (BDU) system. Key voltage measurements can
make use of the integrated digital low-pass filters.
The device has a highly accurate integrated current
sense ADC capable of measuring current in low-side
shunt resistor. The device is capable of measuring
the insulation resistance with internal ADC and able
to control any switching scheme needed for this
measurement. There are eight GPIOs/auxillary inputs
that can be used for thermistor measurement, driving
relays, measuring voltages, and being a master SPI
interface to peripheral SPI devices. The isolated bi-
directional daisy-chain ports support both capacitor or
transformer based isolation. The device also supports
communication over UART.
Device Information
PART NUMBER PACKAGE
(1)
BODY SIZE (NOM)
BQ79631-Q1 HTQFP (64-pin) 10.00 mm x 10.00 mm
(1) For all available packages, see the orderable addendum at
the end of the data sheet.
precharge
R
VBOT
:
:
:
:
:
:
VTOP
precharge
R
PACK-
CHARGE-
CHARGE+
:
:
:
:
HV Separator
(PYROFUSE)
PACK+
HALL SENSOR
VFUSE
LINK+
EEPROMEEPROM
:
:
BQ79631-Q1
GPIOGPIO
TEMPTEMP
Voltage Sense
Current
Sense
I/OI/O
BQ79631-Q1
GPIO
TEMP
Voltage Sense
Current
Sense
I/O
1
COMH
COML
3
4
5
SHUNT CURRENT
SENSE
RsenseRsense
DC fast
Charging
Port
6
DAISY CHAIN
COMMUNICATION
INSULATION MONITORING
2
PACK MEASUREMENT
1
LINK MEASUREMENT
CHARGE MEASUREMENT
HALL SENSOR
5
6
VFUSE MEASUREMENT
SPI MasterSPI Master
LOAD
Contactor
Control
---------------
Relay Driver
Contactor
Control
---------------
Relay Driver
Rstring Switch
Control
Rstring Switch
Control
2
INSULATION
RESISTANCE
Chassis
Gnd
INSULATION
RESISTANCE
Chassis
Gnd
BJB/BDU
7
8
LINK-
7
8
3
4
AMP
OC detect
UARTUART
SAFETY
MCU
SAFETY
MCU
CAN
Either/OR
SAFETY
MCU
CAN
Either/OR
DIG
ISOLATOR
SAFETY
MCU
CAN
Either/OR
DIG
ISOLATOR
Simplified System Diagram
BQ79631-Q1
SLUSER7 – 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.
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