Overview
The AD7280AWBSTZ, produced by Analog Devices Inc., is a high-performance lithium ion battery monitoring system designed for various battery management applications. This integrated circuit is particularly suited for monitoring stacked lithium ion batteries in hybrid electric vehicles, battery backup systems, and power tools. The AD7280A features a comprehensive set of functions that include cell voltage measurement, cell balancing, and auxiliary ADC inputs for temperature and system diagnostics.
Key Specifications
| Parameter | Min | Typ | Max | Unit | Test Conditions/Comments |
|---|---|---|---|---|---|
| VDD Operating Range | 8 | 30 | V | ||
| Temperature Range | -40 | 105 | °C | ||
| ADC Resolution | 12 bits | ||||
| Conversion Time per Channel | 1 μs | ||||
| Analog Input Channels | 6 differential channels | Common-mode range: 0.5 V to 27.5 V | |||
| Auxiliary ADC Inputs | 6 channels | For temperature measurement or system diagnostics | |||
| Cell Voltage Accuracy | ±1.6 mV | ||||
| Internal Reference Accuracy | ±3 ppm/°C | ||||
| Power Consumption During Conversion | 5.6 | 7.3 | mA | VDD = 8 V to 30 V | |
| Power Consumption During Data Readback | 5.3 | 7.0 | mA | VDD = 8 V to 30 V | |
| Package Type | 48-lead LQFP |
Key Features
- 12-bit ADC with 1 μs per channel conversion time
- Six differential analog input channels with a common-mode range of 0.5 V to 27.5 V
- Six auxiliary ADC inputs for temperature measurement or system diagnostics
- Cell balancing interface outputs to control external FET transistors for cell discharging
- Internal ±3 ppm/°C reference for high cell voltage accuracy (±1.6 mV)
- Daisy-chain interface allowing up to eight parts to be stacked without individual device isolation
- On-chip registers for channel sequencing and dynamic alert functions
- Serial interface with CRC protection on read and write commands
- Built-in self-test feature applying a known voltage to the ADC inputs
- High input impedance and low power-down current (1.8 μA)
Applications
- Lithium ion battery monitoring in hybrid electric vehicles and electric vehicles
- Battery backup systems
- Power tools
- General-purpose monitoring of stacked lithium ion batteries
Q & A
- What is the primary function of the AD7280AWBSTZ?
The AD7280AWBSTZ is primarily used for monitoring and managing lithium ion battery stacks in various applications. - What is the ADC resolution of the AD7280AWBSTZ?
The ADC resolution is 12 bits. - How many analog input channels does the AD7280AWBSTZ have?
The AD7280AWBSTZ has six differential analog input channels. - What is the cell voltage accuracy of the AD7280AWBSTZ?
The cell voltage accuracy is ±1.6 mV. - Does the AD7280AWBSTZ support daisy-chaining?
Yes, it supports daisy-chaining of up to eight parts without individual device isolation. - What is the operating temperature range of the AD7280AWBSTZ?
The operating temperature range is -40°C to +105°C. - What is the power consumption during conversion?
The power consumption during conversion is typically 7.3 mA. - Does the AD7280AWBSTZ have built-in self-test capabilities?
Yes, it includes a built-in self-test feature that applies a known voltage to the ADC inputs. - What type of package does the AD7280AWBSTZ come in?
The AD7280AWBSTZ comes in a 48-lead LQFP package. - Is the AD7280AWBSTZ qualified for automotive applications?
Yes, it is qualified for automotive applications.
