Overview
The AD7284WBSWZ-RL, produced by Analog Devices Inc., is a comprehensive lithium-ion battery monitoring system. This integrated circuit (IC) is designed to monitor and manage battery cells in various applications, including electric and hybrid electric vehicles, and stationary power systems. The AD7284 features a 14-bit analog-to-digital converter (ADC) with multiplexed cell voltage and auxiliary measurement channels, supporting up to eight battery cells. It also includes internal temperature sensing, cell balancing capabilities, and a robust daisy-chain interface for communication between multiple devices.
Key Specifications
| Parameter | Min | Typ | Max | Unit | Test Conditions/Comments |
|---|---|---|---|---|---|
| VDD Operating Range | 10 V | 40 V | V | ||
| ADC Resolution | 14 Bits | No missing codes | |||
| Integral Nonlinearity (INL) | −1.4 LSB | 1.4 LSB | |||
| Differential Nonlinearity (DNL) | −0.8 LSB | 0.8 LSB | |||
| Internal Temperature Sensor Accuracy | −3 °C | 3 °C | °C | −30°C ≤ TJ ≤ +120°C | |
| Regulator Output Voltage (VREG5) | 4.8 V | 5 V | 5.2 V | V | |
| Cell Balancing Output Voltage High | 3.7 V | 5.3 V | V | ISOURCE = 20 μA | |
| Junction Temperature Range | −30°C | +120°C | °C |
Key Features
- Multiplexed cell voltage and auxiliary ADC measurement channels supporting four to eight battery cells.
- Four auxiliary analog input channels suitable for thermistor inputs and external diagnostics.
- Internal temperature sensor with ±3 °C accuracy.
- Buffered reference output for ratiometric measurements.
- On-chip 5 V regulator with internal short-circuit protection.
- Robust, proprietary daisy-chain interface for device-to-device communication.
- SPI interface with CRC protection on read and write commands.
- Two general-purpose outputs.
- Cell balancing interface to control external field effect transistors (FETs) for discharging individual cells.
Applications
- Lithium-ion battery monitoring in electric and hybrid electric vehicles.
- Stationary power applications.
- Industrial battery management systems.
Q & A
- What is the primary function of the AD7284WBSWZ-RL? The AD7284WBSWZ-RL is a lithium-ion battery monitoring system designed to monitor and manage battery cells in various applications.
- How many battery cells can the AD7284 support? The AD7284 can support up to eight battery cells.
- What is the resolution of the ADC in the AD7284? The ADC has a 14-bit resolution.
- What is the operating voltage range of the AD7284? The AD7284 operates from a VDD supply ranging from 10 V to 40 V.
- Does the AD7284 have internal temperature sensing? Yes, the AD7284 includes an internal temperature sensor with ±3 °C accuracy.
- What communication interface does the AD7284 use? The AD7284 uses an SPI interface with CRC protection on read and write commands.
- What is the purpose of the cell balancing interface in the AD7284? The cell balancing interface controls external field effect transistors (FETs) to allow discharging of individual cells.
- Is the AD7284 qualified for automotive applications? Yes, the AD7284 is qualified for automotive applications.
- What is the junction temperature range of the AD7284? The junction temperature range is −30°C to +120°C.
- Does the AD7284 have any auxiliary input channels? Yes, it has four auxiliary analog input channels suitable for thermistor inputs and external diagnostics.
