NXP Semiconductors MC34903CS3EKR2

Overview

MC34903CS3EKR2 from NXP Semiconductors (formerly Freescale) is a System Basis Chip (SBC) integrating a 3.3 V MCU power regulator, ISO 11898-2/5 high-speed CAN transceiver, LIN 2.1 interface, four configurable wake-up I/O pins, and SPI-controlled diagnostics. It delivers fail-safe operation with bus fault detection, undervoltage monitoring, and thermal protection for automotive ECU power management.

For engineers reviewing the MC34903CS3EKR2 datasheet, MC34903CS3EKR2 pinout, MC34903CS3EKR2 application, or MC34903CS3EKR2 equivalent, this device supports critical low-power mode selection, cyclic sense functionality, CAN/LIN wake-up validation, and VDD/VSENSE/SAFE signal monitoring in harsh industrial and automotive environments.

Technical Context

The MC34903CS3EKR2 implements a SMARTMOS-based power management architecture with dual supply inputs (VSUP and VSUP2), an integrated 3.3 V VDD regulator (150 mA nominal, up to 200 mA with external PNP ballast), and independent 5 V-CAN regulator. Its fail-safe state machine monitors RST, VDD, watchdog timeout, and CAN bus integrity to assert the open-drain SAFE pin.

It supports three LP modes: VDD OFF (15–50 µA), VDD ON with undervoltage/overcurrent monitoring (20–85 µA), and oscillator-enabled cyclic sense (additional 5–9 µA). Wake-up sources include CAN activity, LIN transitions, I/O edge detection, SPI messages, and VDD overcurrent - all configurable via SPI registers.

Key Specifications

Pinout & Package

MC34903CS3EKR2 uses a 32-pin SOIC package with exposed thermal pad (Pb-free EK suffix). Pin compatibility is maintained across the MC34903/4/5 family, enabling modular board design.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar system basis chip applications.

Compared with MC34903CS3EKR2, MC34903CP3EK/R2 removes LIN functionality and reduces I/O count, simplifying design for pure CAN nodes; MC34904C3EK/R2 retains full analog monitoring and adds VAUX but omits LIN - offering higher integration for non-LIN automotive subsystems.

Availability

MC34903CS3EKR2 is available at Aetrix Electronics and suitable for automotive body electronics, industrial motor controllers, robotics actuator nodes, and smart sensor hubs requiring stable component supply across extended temperature and voltage ranges.

Supply support for MC34903CS3EKR2 includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

NXP Semiconductors is a global semiconductor leader focused on secure connectivity solutions for automotive, industrial, and IoT applications, with deep expertise in automotive-grade analog and mixed-signal ICs.

The MC34903CS3EKR2 belongs to NXP's System Basis Chip product line, designed specifically for automotive and industrial electronic control units requiring integrated power management, CAN/LIN communication, and robust fail-safe operation in harsh environments.

FAQ

What is the maximum continuous output current of the VDD regulator in MC34903CS3EKR2?

The MC34903CS3EKR2 VDD regulator delivers up to 150 mA continuously without external components. With an external PNP ballast transistor connected to VB, VE, and VBAUX pins, it supports up to 200 mA total output current while sharing thermal load - confirmed in the Electrical Characteristics table under "Output Current limitation" and "Drop voltage with external transistor".

Does MC34903CS3EKR2 support both CAN and LIN simultaneously?

Yes, MC34903CS3EKR2 integrates one ISO 11898-2/5 high-speed CAN interface and one LIN 2.1 master interface concurrently. The LIN block includes dedicated TXD-L, RXD-L, and LIN-T/I/O-2 pins, and operates independently of CAN - verified in the Device Variations table and Functional Block Diagram for MC34903S.

What wake-up sources are available in low-power mode for MC34903CS3EKR2?

In low-power mode, MC34903CS3EKR2 supports wake-up from CAN bus activity, LIN bus transitions, edge-triggered I/O-0 to I/O-3 inputs, SPI message reception, automatic timer expiration, and VDD overcurrent detection - all documented in the Functional Description section and Table 3 (Device Variations) under "Wake-up Input / LIN Master Termination".

Is MC34903CS3EKR2 pin-compatible with other devices in the 34903/4/5 family?

Yes, MC34903CS3EKR2 is footprint-compatible with MC34904, MC34905, and other MC34903 variants in the 32-pin SOIC exposed-pad package - explicitly stated in the Pin Connections section: "MC34905D, MC34905S, MC34904 and MC34903 are footprint compatible, 32 pin exposed package." This enables hardware reuse across different feature sets.

What is the purpose of the MUX-OUT pin on MC34903CS3EKR2?

The MUX-OUT pin on MC34903CS3EKR2 provides a multiplexed analog output selectable via SPI, allowing monitoring of VDD voltage, VSENSE (battery sense), internal temperature, or other internal analog parameters - described in Pin Definitions Table 4 and confirmed in the Analog Monitoring block of Figure 7 (MC34903 Internal Block Diagram).