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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 NUMBERPACKAGE

(1)

BODY SIZE (NOM)

BQ79631-Q1HTQFP (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

---------------

RelayDriver

Contactor

Control

---------------

Relay Driver

RstringSwitch

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

SLUSEC2A – DECEMBER 2021 – REVISED NOVEMBER 2023

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.

Produktspecifikationer