BQ79631-Q1数据手册TI中文资料规格书

描述 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.

Host communication to the BQ79631-Q1 can be connected via the device’s dedicated UART interface or through a communication bridge device, BQ79600-Q1. Additionally, an isolated, differential daisy-chain communication interface allows the host to communicate with the other UIR monitors and even cell monitors over a single interface. In the event of a communication line break, the daisy-chain communication interface is configurable to a ring architecture that allows the host to talk to devices at either end of the stack.

特性 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