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BQ79826Q1EVM-086
BQ79826Z-Q1 evaluation module
BQ79826Q1EVM-086
Overview
The BQ79826Z-Q1 Evaluation Module (EVM), also referred to as BMS086, describes the general features, theory of operation, hardware setup, and use of TI's BQ79826Z-Q1 device. The BQ79826ZQ1 device is a highly integrated stackable 26- cell monitor with up to 300mA passive balancing current capability, ±1.25mV cell voltage sensing accuracy, and integrated OV/UV cell protector. This device also has 20 multi-purpose GPIO pins with additional temperature sensing capabilities, SPI/I2C controler bus support, and ASIL-D functional safety capability. BQ79826Z-Q1 integrates an electrochemical impedance spectroscopy (EIS) measurement engine for in-system cell operation diagnostics and early cell failiure detection. This device is primarily used in automotive battery packs, industrial and comercial energy storage systems (ESS), and cell monitoring applications with advanced diagnostic capabilities for functional safety enabled systems. The BMS086 evaluation board is intended for examining the potential device use-case in systems containing large format lithium-ion battery pack applications to provide monitoring, system protection, and daisy-chain communications.
Features
- 26 battery cell support
- 0V to 5V range for cell or -2V to 2V range for busbar
- 145V ABS MAX rating, 9V minimum supply voltage
- Busbar support on every channel
- Stackable up to 128 devices
- Voltage Accuracy
- <1.25mV cell accuracy across temperature range
- <4.5mV ASIL-D accuracy (DC)
- Passive cell balancing with integrated FETs for up to 300mA balancing currents
- Integrated electrochemical impedance spectroscopy (EIS) engine
- Impedance Accuracy: 1% with 1A excitation, 200μΩ impedance
- Measurement frequency: 0.01Hz to 3.5 kHz
- 20 Sensor and GPIO pins with arbitrated use
- Digital IOs (GPIO) for Contactor/Relay and Fuse driver control and status
- Analog Inputs (general use and temperature sense)
- SPI and I2C controller interface
- Dedicated sensor monitor with peak-hold detector
- Integrated diagnostics and protection
- Over/Under voltage, over/under temperature cell protection
- Open-wire detection
- Two die temperature sensors
- Battery pack supply over/under voltage detection
- Automatic diagnostics during cell balancing
- Communication
- Upgraded Daisy-Chain Interface with 2 Mbps (single) and 4 Mbps (dual) SPI modes
- Reverse MCU wake-up capability on any fault
- Transformer or capacitor isolation supprt
- EMI / EMC optimized design
Battery monitors & balancers
Order & start development
Evaluation board
BQ79826Q1EVM-086 — BQ79826Z-Q1 evaluation module
BQ79826Q1EVM-086 — BQ79826Z-Q1 evaluation module
Technical documentation
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| Top documentation | Type | Title | Format options | Date |
|---|---|---|---|---|
| Certificate | BQ79826Q1EVM EU Declaration of Conformity (DoC) | PDF | HTML | Apr 11, 2025 |
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