ADBMS1818ASWZ

Overview

The ADBMS1818ASWZ is an 18-cell battery monitor manufactured by Analog Devices Inc. in a 64-lead LQFP package. It measures up to 18 series-connected cells with a maximum total measurement error of 3mV and completes all cell measurements within 290µs. The device features a built-in isoSPI interface supporting 1Mb isolated serial communication over twisted pairs up to 100 meters. It includes a 16-bit Σ-Δ ADC, programmable passive balancing via PWM, and nine general-purpose digital I/O or analog inputs. Operating temperatures range from -40°C to +85°C.

Feature Summary

• Supports stackable architecture for high-voltage systems using daisy-chain connections
• Provides bidirectional wire-break protection and low EMI susceptibility
• Enables synchronous voltage and current measurement capabilities
• Integrates programmable noise filtering and configurable host interfaces

Applications

• Backup power supply systems
• Grid energy storage installations
• Residential energy storage units
• Uninterruptible power supplies (UPS)
• High-power portable equipment

Procurement Notes

Verify the specific suffix designation against official datasheets to confirm pinout and functional variations. Ensure compatibility with required isolation voltages and communication protocols. Confirm RoHS compliance status through manufacturer documentation. Validate thermal performance requirements against the specified operating temperature range. Check for any product change notifications affecting packaging or material composition.

Selection Notes

Select this component for applications requiring precise monitoring of large series battery stacks. The integrated isoSPI interface simplifies wiring compared to traditional SPI implementations. Consider the 290µs measurement speed for dynamic load conditions. Evaluate the need for passive balancing against active alternatives. Verify that the 64-lead LQFP package fits the available PCB real estate constraints.

Part Context

This part belongs to the ADBMS1818 family of multi-cell battery monitors designed for industrial and automotive environments. It serves as a core component in Battery Management Systems (BMS) where accurate state-of-charge estimation and cell balancing are critical. The device replaces discrete solutions by integrating measurement, protection, and communication functions into a single IC.

Replacement Considerations

Publicly confirmed substitute part numbers are not available in the provided source data.