MC33389CDWR2

Specialized Overview

The MC33389CDWR2 is a System Basis Chip (SBC) integrating a low-speed fault-tolerant CAN transceiver, dual voltage regulators, and power management functions for automotive Engine Control Units. It operates with a DC supply voltage up to 27 V and withstands 40 V transient voltages. The device features a 5.0 V regulator (V1) with 100 mA capability for the microcontroller and a 5.0 V regulator (V2) with 200 mA capability for peripherals. A VBAT switch (V3) provides 100 mA output current for external loads. It supports three operational modes: Normal, Stand-by, and Sleep, managed via an SPI interface.

Specialized Feature Summary

• Integrates a low-speed 125 kBaud fault-tolerant CAN physical interface compatible with standalone transceivers.
• Includes dual low-drop voltage regulators with independent current limiting and over-temperature detection capabilities.
• Provides programmable wake-up inputs and cyclic wake-up functionality to minimize sleep mode current consumption.
• Features a software-programmable window watchdog timer and reset generation logic controlled via SPI.

Specialized Applications

• Automotive Engine Control Units (ECUs)
• Car body applications requiring integrated power and communication management
• Systems utilizing low-speed fault-tolerant CAN bus networks

Specialized Procurement Notes

Verify that the ordering suffix 'R2' corresponds to tape-and-reel packaging as specified in the datasheet. Confirm the 'D' variant designation aligns with the required V1 reset threshold characteristics relative to the 'C' version. Ensure the SOICW package type matches the PCB footprint requirements. Check for Pb-free status indicated by the EG suffix if environmental compliance is mandatory.

Specialized Selection Notes

Select this component when a monolithic solution combining a fault-tolerant CAN transceiver with dual regulated supplies is required for ECU designs. Choose the 'D' variation if specific V1 undervoltage reset thresholds differ from the standard 'C' version. Ensure the 28-pin SOICW package accommodates the thermal dissipation needs of the application. Verify compatibility with the system's SPI interface timing requirements.

Specialized Part Context

The MC33389 belongs to the System Basis Chip family designed for automotive body and engine control applications. It consolidates functions typically implemented with discrete components, including voltage regulation, CAN transceiving, and power switching. The device simplifies ECU design by reducing board space and component count while providing robust protection against electrical faults common in automotive environments.

Specialized Replacement Considerations

The MC33388 is referenced as a compatible standalone physical interface. However, it lacks the integrated voltage regulators and power management features of the MC33389. Substitution requires redesigning the power supply and protection circuitry on the PCB.