ADBMS1818ASWAZ-RL

Overview

The ADBMS1818ASWAZ-RL is an 18-cell battery monitor designed for high-voltage stacks. It measures up to 18 series-connected cells with a total measurement error of less than 3mV. The device features a built-in isoSPI interface supporting 1Mb isolated serial communication over single twisted pairs up to 100 meters. It operates within a supply voltage range of 0V to 5V and supports temperatures from -40°C to +85°C. Key specifications include a 6µA sleep mode current, 290µs full system measurement time, and a 16-bit Δ-Σ ADC with programmable noise filtering.

Feature Summary

• Stackable architecture enables monitoring of long series strings in high-voltage systems
• Integrated isoSPI interface provides bidirectional, low EMI isolated communication
• Passive cell balancing via programmable PWM supports currents up to 200mA maximum
• Synchronous voltage and current measurement capabilities with configurable I2C or SPI host modes

Applications

• Backup power systems
• Grid energy storage applications
• High-voltage battery stack monitoring

Procurement Notes

Verify the specific suffix ASWAZ against the manufacturer's latest datasheet to confirm package type and tape/reel specifications. Confirm RoHS compliance status directly with Analog Devices documentation. Check for any recent product change notifications that may affect pinout or electrical characteristics before finalizing procurement.

Selection Notes

Select this component when monitoring up to 18 series cells with strict accuracy requirements under 3mV total error. The integrated isoSPI simplifies wiring compared to standard isolated interfaces. Ensure the application requires passive balancing rather than active switching. Verify that the operating temperature range of -40°C to +85°C meets environmental constraints.

Part Context

This part belongs to the ADBMS1818 family of multi-cell battery monitors. It is distinct from the AD80918, which is also an 18-cell monitor but may differ in interface or performance metrics. The ADBMS1818 is specifically engineered for daisy-chained configurations in large-scale battery management systems requiring robust isolation.

Replacement Considerations

Publicly confirmed substitute part numbers are not available in the provided source material. Consult Analog Devices official documentation for direct replacements or updated revisions.