Overview
The AD7280ABSTZ-RL, produced by Analog Devices Inc., is a sophisticated lithium-ion battery monitoring system designed for precise and reliable battery management. This integrated circuit (IC) is particularly suited for applications in electric and hybrid electric vehicles, power supply backup systems, and power tools. The AD7280A series, which includes the AD7280ABSTZ-RL, features a 12-bit analog-to-digital converter (ADC) with a conversion time of 1 μs per channel, ensuring high-speed and accurate measurements.
Key Specifications
| Parameter | Min | Typ | Max | Unit | Test Conditions/Comments |
|---|---|---|---|---|---|
| Resolution | 12 Bits | No missing codes | |||
| Integral Nonlinearity | ±1 LSB | ||||
| Differential Nonlinearity | ±0.8 LSB | ||||
| Offset Error | ±1 LSB | ||||
| Gain Error | ±1 LSB | ||||
| VDD Operating Range | 8 V | 30 V | V | ||
| Temperature Range | -40°C | +105°C | °C | ||
| Power Consumption (Master Device During Conversion) | 5.6 mA | 7.3 mA | mA | ||
| Power Consumption (Master Device During Data Readback) | 5.3 mA | 7.0 mA | mA |
Key Features
- 12-bit ADC with 1 μs per channel conversion time
- Six differential analog input channels for cell voltage measurement
- Six auxiliary ADC input channels for temperature measurement or system diagnostics
- On-chip voltage regulator and internal reference (±3 ppm/°C)
- Cell balancing interface outputs to control external FET transistors
- Daisy-chain interface allowing up to eight parts to be stacked
- Serial interface with alert function and CRC protection on read and write commands
- High input impedance and low power-down current (1.8 μA)
- On-chip registers for channel sequencing and dynamic alert function
Applications
- Lithium-ion battery monitoring
- Electric and hybrid electric vehicles
- Power supply backup systems
- Power tools
Q & A
- What is the primary function of the AD7280ABSTZ-RL? The primary function is to monitor and manage lithium-ion battery cells.
- What is the resolution of the ADC in the AD7280ABSTZ-RL? The ADC has a resolution of 12 bits.
- What is the conversion time per channel for the ADC? The conversion time per channel is 1 μs.
- How many analog input channels does the AD7280ABSTZ-RL have? It has six differential analog input channels and six auxiliary ADC input channels.
- What is the operating voltage range for the VDD supply? The VDD supply operates from 8 V to 30 V.
- What is the temperature range for the AD7280ABSTZ-RL? The temperature range is from -40°C to +105°C.
- Does the AD7280ABSTZ-RL support daisy-chaining? Yes, it supports daisy-chaining of up to eight parts.
- What is the purpose of the cell balancing interface outputs? The cell balancing interface outputs are used to control external FET transistors for discharging individual cells.
- Does the AD7280ABSTZ-RL have built-in self-test features? Yes, it includes a built-in self-test feature that internally applies a known voltage to the ADC inputs.
- What kind of interface does the AD7280ABSTZ-RL use for communication? It uses a serial interface with SPI and alert functions, along with CRC protection on read and write commands.
