Overview
The BQ79631-Q1, produced by Texas Instruments, is a high-voltage battery pack monitor designed specifically for automotive applications. This device is AEC-Q100 qualified and features a wide ambient operating temperature range of –40°C to +125°C, making it highly reliable in harsh environments. It is developed for functional safety applications and complies with ISO 26262 system design requirements, supporting systematic and hardware capabilities up to ASIL D.
The BQ79631-Q1 provides comprehensive monitoring capabilities, including voltage, current, and insulation resistance sensing, which are crucial for the safe and efficient operation of high-voltage battery packs in electric, plug-in hybrid, and hybrid vehicles.
Key Specifications
| Parameter | Min | Typ | Max | Unit |
|---|---|---|---|---|
| Input Voltage (VPWR, VS*, AUX*) | -0.3 | 5 | V | |
| Current Sense Range (VSRP - VSRN) | -100 | 100 | mV | |
| Operating Temperature | -40 | 125 | °C | |
| Thermal Shutdown (Rising Direction) | 130 | 137 | 152 | °C |
| Supply Current in SHUTDOWN Mode | 16 | 23 | µA | |
| Baseline Supply Current in SLEEP Mode | 120 | 160 | µA | |
| Baseline Supply Current in ACTIVE Mode | 10.4 | 11.6 | mA | |
| Junction-to-Ambient Thermal Resistance (RθJA) | 21.6 | °C/W |
Key Features
- Qualified for automotive applications with AEC-Q100 certification and a device temperature grade 1: –40°C to +125°C.
- Differential voltage measurements with integrated digital low-pass filters for high accuracy.
- Integrated precision current measurement supporting low-side shunt resistor.
- Insulation resistance monitoring capability.
- Eight GPIO inputs configurable as IO, SPI, ADC, and temperature sense.
- Isolated differential daisy-chain communication with optional ring architecture.
- Synchronized current and voltage measurements.
- Stackable and syncs with other cell and UI monitors (16S, 14S, 12S).
- Built-in SPI master and UART host interface.
- Simplifies battery junction box (BJB) or battery disconnect unit (BDU) system by eliminating the need for safety MCU, CAN transceivers, and multi-wire interface.
Applications
The BQ79631-Q1 is designed for use in various automotive applications, including:
- Full Electric Vehicles (EVs)
- Plug-In Hybrid Vehicles (PHEVs)
- Hybrid Vehicles (HEVs)
It is particularly useful in high-voltage battery pack monitoring systems within these vehicles, ensuring safe and efficient operation.
Q & A
- What is the operating temperature range of the BQ79631-Q1?
The BQ79631-Q1 operates within a temperature range of –40°C to +125°C.
- What types of measurements can the BQ79631-Q1 perform?
The device can perform differential voltage measurements, precision current measurements, and insulation resistance measurements.
- Is the BQ79631-Q1 qualified for automotive applications?
Yes, it is AEC-Q100 qualified and designed for automotive use.
- What communication interfaces does the BQ79631-Q1 support?
The device supports UART host interface, SPI master, and isolated differential daisy-chain communication with optional ring architecture.
- Can the BQ79631-Q1 be stacked with other monitors?
Yes, it is stackable and can sync with other cell and UI monitors (16S, 14S, 12S).
- What is the package type and size of the BQ79631-Q1?
The device comes in a 64-pin HTQFP package with a body size of 10.00 mm x 10.00 mm.
- Does the BQ79631-Q1 support functional safety requirements?
Yes, it is developed for functional safety applications and supports ISO 26262 system design requirements up to ASIL D.
- What is the thermal shutdown temperature of the BQ79631-Q1?
The thermal shutdown temperature is between 130°C and 152°C (rising direction)...
- How many GPIO inputs does the BQ79631-Q1 have?
The device has eight GPIO inputs that can be configured as IO, SPI, ADC, and temperature sense.
- What types of vehicles can the BQ79631-Q1 be used in?
The BQ79631-Q1 can be used in full electric vehicles, plug-in hybrid vehicles, and hybrid vehicles.
