Overview
The AD8280WASTZ, produced by Analog Devices Inc., is a hardware-only safety monitor specifically designed for lithium-ion battery stacks. This device is capable of monitoring three to six battery cells and two temperature sensors, making it an essential component in battery management systems. It features a wide supply voltage range of 6.0 V to 30.0 V and is designed to operate within an extended temperature range of −40°C to +105°C, ensuring reliability in various environmental conditions.
Key Specifications
| Parameter | Min | Typ | Max | Unit |
|---|---|---|---|---|
| Supply Voltage Range | 6.0 | 30.0 | V | |
| Operating Temperature Range | −40 | +105 | °C | |
| Number of Cells Monitored | 3 | 6 | ||
| Package Type | 48-LQFP (7x7) | |||
| Quiescent Current | 7.5 | mA | ||
| Fault Detection (Deglitch) Time Range | 0.0 | 10.0 | sec | |
| Propagation Delay Time | 4.0 | µs | ||
| Start-Up Time | 3.0 | ms |
Key Features
- Adjustable Threshold Levels: The device allows for adjustable overvoltage, undervoltage, and overtemperature threshold levels using external resistor dividers.
- Alarm Options: Alarm outputs for overvoltage, undervoltage, and overtemperature can be shared or separate, each indicating the status of specific conditions.
- Multiple Cell Monitoring: Capable of monitoring three to six battery cells and two temperature sensors.
- Daisy Chain Configuration: Multiple devices can be configured in a daisy chain to monitor hundreds of cells.
- Extensive Self-Test Feature: Ensures that internal components are functioning correctly, initiated via the TESTI pin.
- Programmable Deglitching Circuitry: Ignores transient voltages appearing at the cell inputs.
- LDO and Reference: Includes an LDO to drive external components and a reference for setting trip points.
Applications
The AD8280WASTZ is primarily used in battery management systems for lithium-ion batteries, particularly in applications requiring robust and reliable monitoring of battery cell voltages and temperatures. This includes:
- Electric vehicles and hybrid electric vehicles.
- Energy storage systems.
- Industrial power systems.
- Consumer electronics with high-capacity battery packs.
Q & A
- What is the primary function of the AD8280WASTZ?
The primary function of the AD8280WASTZ is to monitor lithium-ion battery stacks, specifically three to six battery cells and two temperature sensors, to ensure safe operation.
- What is the supply voltage range of the AD8280WASTZ?
The supply voltage range is from 6.0 V to 30.0 V.
- What is the operating temperature range of the AD8280WASTZ?
The operating temperature range is from −40°C to +105°C.
- Can the AD8280WASTZ be configured in a daisy chain?
- What types of alarms does the AD8280WASTZ support?
The device supports separate or shared alarms for overvoltage, undervoltage, and overtemperature conditions.
- How does the AD8280WASTZ handle transient voltages?
The device includes programmable deglitching circuitry to ignore transient voltages appearing at the cell inputs.
- What is the purpose of the LDO and reference in the AD8280WASTZ?
The LDO can drive external components such as thermistors or isolators, and the reference is used with voltage dividers to establish trip points.
- How is the self-test feature initiated in the AD8280WASTZ?
The self-test feature is initiated via the TESTI pin.
- What is the quiescent current of the AD8280WASTZ?
The quiescent current is 7.5 mA.
- What package type does the AD8280WASTZ come in?
The device comes in a 48-LQFP (7x7) package.
