ADBMS1818ASWAZ

Overview

The ADBMS1818ASWAZ is an 18-cell battery monitor manufactured by Analog Devices Inc. It measures up to 18 series-connected cells with a maximum total measurement error of less than 3mV and a measurement range of 0V to 5V per cell. The device completes all 18-channel sampling in 290μs using a 16-bit Σ-Δ ADC with a programmable third-order noise filter. It features a capacitive coupled isoSPI interface for isolated serial communication, supporting daisy-chained stacks. The part includes passive battery balancing via programmable PWM, nine general-purpose digital I/O or analog inputs, and operates in a sleep mode with 6μA power current.

Feature Summary

• High-precision voltage monitoring with low total measurement error across 18 channels
• Capacitive coupled isoSPI interface enabling robust, long-distance isolated communication
• Integrated passive battery balancing capability with programmable pulse width modulation
• Flexible GPIO configuration supporting temperature sensing and system control

Applications

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

Procurement Notes

Verify the specific suffix ASWAZ against official datasheets to confirm package type and temperature grade. Confirm availability status as distribution channels may indicate limited stock. Ensure compatibility with evaluation hardware such as EVAL-ADBMS1818Z for design validation before final procurement decisions.

Selection Notes

Select this component for applications requiring high channel count and precise voltage monitoring in stacked battery architectures. The isoSPI interface simplifies wiring compared to traditional SPI solutions in high-voltage environments. Consider the 290μs conversion speed for systems demanding rapid state-of-charge updates. Evaluate the need for integrated balancing against external circuit requirements.

Part Context

The ADBMS1818 belongs to Analog Devices' dedicated battery management family, designed for multicell stack monitoring. It complements other ADI power management solutions like the MAX17335 and ADES1830 series. The device addresses the need for scalable, high-isolation monitoring in industrial and energy storage sectors where safety and accuracy are critical.

Replacement Considerations

Public confirmed substitute part numbers are not available in the provided documentation. Verify functional equivalence with other 18-cell monitors if direct replacement is required.

FAQ

How does the ADBMS1818 handle communication isolation?

It utilizes a capacitive coupled isoSPI interface that provides galvanic isolation, allowing for robust communication over long distances without RF interference.

What is the maximum measurement error for the voltage channels?

The device guarantees a maximum total measurement error of less than 3mV across its 18 channels.