MAX22025AWA+T

Drivers, Receivers, Transceivers Overview

The MAX22025AWA+T is a compact, isolated half-duplex RS-485/RS-422 transceiver featuring 3.5kVRMS digital galvanic isolation between the UART and cable sides. It utilizes proprietary AutoDirection control to eliminate separate driver-enable signals. The device supports data rates up to 0.5Mbps with slew-rate-limited drivers to minimize EMI. It operates on VDDA (1.71V to 5.5V) and VDDB (4.75V to 5.25V). Key specifications include ±10kV HBM ESD protection on A/B pins, 50kV/μs common-mode transient immunity, and operation within a -40°C to +85°C temperature range.

Drivers, Receivers, Transceivers Feature Summary

• Integrated AutoDirection state machine automatically manages driver and receiver enable states based on TXD input and bus voltage.
• Slew-rate-limited driver outputs reduce electromagnetic interference and signal reflections for reliable communication at lower speeds.
• High-voltage capacitive isolation barrier breaks ground loops and withstands significant potential differences between domains.

Drivers, Receivers, Transceivers Applications

• Utility meters requiring isolated communication ports
• Industrial automation equipment with noisy environments
• Programmable logic controllers (PLCs)
• HVAC systems

Drivers, Receivers, Transceivers Procurement Notes

Verify the specific suffix 'WA' corresponds to the tape-and-reel packaging format required for automated assembly processes. Confirm that the '+T' designation aligns with RoHS compliance standards mandated by the target market regulations. Ensure the ordering quantity matches the manufacturer's standard reel size to avoid partial reel handling issues during production.

Drivers, Receivers, Transceivers Selection Notes

Select this component when designing isolated RS-485 interfaces that require simplified control logic through AutoDirection functionality. It is suitable for applications where minimizing EMI emissions is critical due to its reduced slew rate characteristics. Ensure the system design accommodates the separate power domains for VDDA and VDDB to maintain the specified isolation performance.

Drivers, Receivers, Transceivers Part Context

This part belongs to the MAX22025-MAX22028 family of compact isolated transceivers. While sharing the same core isolation architecture and package type, variants in this series differ in maximum data rates and receiver output behaviors. The MAX22025 specifically offers the 0.5Mbps limit and non-following receiver output characteristic distinct from higher-speed siblings.

Drivers, Receivers, Transceivers Replacement Considerations

Direct functional replacements within the same family include the MAX22027AWA+T, which shares identical electrical characteristics and pinout but features a receiver output that always follows the differential bus voltage.

Drivers, Receivers, Transceivers FAQ

How does the AutoDirection feature simplify interface design?

AutoDirection uses an internal state machine to automatically enable or disable the driver and receiver based on the TXD input and the current state of the bus voltage (VA-VB), removing the need for external DE and RE control signals.

What is the behavior of the RXD output during transmission?

For the MAX22025, the receiver output (RXD) does not follow the bus voltage (VA-VB) while the device is in the driver-enabled state, allowing for line interference detection.

What ESD protection levels are provided on the bus pins?

The driver outputs and receiver inputs (Pins A and B) are protected against ±10kV electrostatic discharge to GNDB as specified by the Human Body Model (HBM).