Overview
The AD7284WBSWZ, produced by Analog Devices Inc., is a comprehensive 8-channel lithium-ion battery monitoring system. This integrated circuit is designed for the general-purpose monitoring of stacked Li-Ion batteries, particularly in applications such as hybrid electric vehicles, electric vehicles, and stationary power systems. The AD7284 includes all necessary functions for battery management, including cell voltage and auxiliary analog-to-digital converter (ADC) measurement channels, cell balancing, and diagnostic features.
Key Specifications
| Parameter | Min | Typ | Max | Unit | Test Conditions/Comments |
|---|---|---|---|---|---|
| VDD Operating Range | 10 V | 40 V | V | ||
| Primary ADC Resolution | 14 Bits | No missing codes, 305 μV/LSB | |||
| ADC Unadjusted Error | ±1 mV | ±3 mV | mV | 10°C ≤ TJ ≤ 75°C, 2 V to 3.6 V range | |
| Integral Nonlinearity (INL) | ±1.4 LSB | LSB | |||
| Differential Nonlinearity (DNL) | ±0.8 LSB | LSB | |||
| Junction Temperature Range | −30°C | +120°C | °C | ||
| Package Type | 64-LQFP Exposed Pad | ||||
| Number of Channels | 8 |
Key Features
- Multiplexed cell voltage and auxiliary ADC measurement channels supporting four to eight cells of battery management.
- 14-bit primary ADC with a maximum total unadjusted error (TUE) of ±3 mV.
- Integrated secondary measurement path for data validation.
- Four auxiliary ADC input channels for temperature measurement or system diagnostics.
- Cell balancing interface to control external field effect transistors (FETs) for individual cell discharging.
- Differential daisy-chain interface for multiple device stacking without individual device isolation.
- On-chip 5 V regulator and internal temperature sensor.
- Watchdog timer and general-purpose outputs.
- CRC protection on read and write commands via SPI interface.
Applications
- Lithium-ion battery monitoring in hybrid electric vehicles and electric vehicles.
- Stationary power applications.
- Battery backup systems.
- Automotive applications (qualified for automotive use).
Q & A
- What is the primary function of the AD7284WBSWZ?
The primary function is to monitor stacked Li-Ion batteries in applications such as hybrid electric vehicles and stationary power systems. - What is the resolution of the primary ADC in the AD7284WBSWZ?
The primary ADC has a resolution of 14 bits. - What is the maximum total unadjusted error (TUE) of the AD7284WBSWZ?
The maximum TUE is ±3 mV. - How many auxiliary ADC input channels does the AD7284WBSWZ have?
The device has four auxiliary ADC input channels. - What is the operating voltage range of the AD7284WBSWZ?
The operating voltage range is from 10 V to 40 V. - Does the AD7284WBSWZ have a built-in temperature sensor?
Yes, it includes an internal temperature sensor. - What type of package does the AD7284WBSWZ come in?
The device comes in a 64-LQFP Exposed Pad package. - Is the AD7284WBSWZ qualified for automotive applications?
Yes, it is qualified for automotive use. - How does the AD7284WBSWZ support multiple device stacking?
It supports multiple device stacking through a differential daisy-chain interface. - What communication interface does the AD7284WBSWZ use?
The device uses an SPI interface for communication.
