Infineon Technologies MB88121CPMC1-GS-ERE2

Overview

MB88121CPMC1-GS-ERE2 from Cypress (originally Fujitsu Semiconductor) is a FlexRay Application-Specific Standard Product (ASSP) that adds ISO 17458-4-compliant FlexRay 2.1 protocol connectivity to external microcontrollers lacking embedded FlexRay controllers. It features Bosch ERAY IP-based communication controller, supports dual-channel 10 Mbit/s data rates, includes 8 KB message RAM with configurable buffers (up to 128 × 48-byte or 30 × 254-byte), and operates from single 3.3 V or 5.0 V supply with internal 1.8 V core regulator. Used in automotive chassis and powertrain domain controllers requiring deterministic, fault-tolerant high-speed bus communication.

For engineers reviewing the MB88121CPMC1-GS-ERE2 datasheet, MB88121CPMC1-GS-ERE2 pinout, MB88121CPMC1-GS-ERE2 application, or MB88121CPMC1-GS-ERE2 equivalent, key selection criteria include FlexRay protocol version (2.1), host interface mode support (16-bit multiplexed/non-multiplexed parallel or SPI), DMA request signaling for zero-wait buffer transfers, and operating temperature range (−40 °C to +125 °C).

Technical Context

The MB88121CPMC1-GS-ERE2 implements the FlexRay 2.1 protocol stack via licensed Bosch ERAY IP, supporting static/dynamic segment scheduling, cycle-based communication, and dual-channel redundancy. Its on-chip PLL accepts external clock inputs of 4/5/8/10/16/20 MHz and generates an internal 80 MHz system clock with 50% duty cycle.

It provides three host interface modes-16-bit multiplexed parallel, 16-bit non-multiplexed parallel, and SPI-selected by MD[2:0] pins at power-up. The DMA_REQ signal enables asynchronous host writes to the input buffer without polling, reducing CPU overhead during high-throughput message transmission.

Key Specifications

Pinout & Package

The MB88121CPMC1-GS-ERE2 is housed in a 64-pin plastic LQFP (FPT-64P-M03/M24) package with 0.5 mm pitch, RoHS-compliant and moisture-sensitive level 3 (MSL3).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar FlexRay interface applications.

Compared with MRD600A and R7F701028, MB88121CPMC1-GS-ERE2 uniquely balances protocol fidelity (full v2.1), dual 10 Mbit/s throughput, and host MCU agnosticism-making it optimal for retrofitting FlexRay into existing 8/16/32-bit automotive ECUs without redesigning the core processor architecture.

Availability

MB88121CPMC1-GS-ERE2 is available at Aetrix Electronics and suitable for automotive brake-by-wire systems, electric power steering units, ADAS domain controllers, and transmission control modules requiring stable component supply across extended product lifecycles.

Supply support for MB88121CPMC1-GS-ERE2 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

Cypress Semiconductor (acquired by Infineon in 2020) delivered high-performance automotive and industrial ICs, including NOR flash, PSoC, Traveo MCUs, and connectivity solutions, with focus on reliability and system-level integration.

The MB88121 series belongs to Cypress's automotive ASSP portfolio, designed specifically to extend FlexRay connectivity to legacy and cost-optimized microcontrollers-enabling functional safety architectures without full MCU replacement.

FAQ

What host microcontrollers are compatible with MB88121CPMC1-GS-ERE2?

The device supports Fujitsu FR-family 32-bit and 16FX 16-bit MCUs via its configurable parallel interface, but is vendor-agnostic: any 16-bit or 32-bit microcontroller with programmable wait-state control, address/data multiplexing support, and interrupt-capable GPIO can interface using the documented timing diagrams. SPI mode enables compatibility with ARM Cortex-M0+/M3/M4 devices.

Does MB88121CPMC1-GS-ERE2 require an external FlexRay transceiver?

Yes. MB88121CPMC1-GS-ERE2 is a protocol controller only and does not integrate physical layer drivers. It must be paired with a compliant FlexRay transceiver such as NXP TJA1080 or Infineon TLE6250G, connected via TXDA/RXDA and TXDB/RXDB pins to drive the differential bus lines.

How is the 80 MHz internal clock generated?

An on-chip PLL multiplies an external clock input (4/5/8/10/16/20 MHz) to produce a precise 80 MHz system clock with 50% duty cycle. The PLL locks within 100 μs after power-on and maintains jitter <±50 ps RMS over temperature, meeting FlexRay timing stability requirements for static segment synchronization.

Can MB88121CPMC1-GS-ERE2 operate in single-channel mode?

Yes. The device supports independent configuration of Channel A and Channel B. Either channel can be disabled via register settings, allowing operation in single-channel mode for cost-sensitive applications while retaining full protocol compliance and message buffer allocation flexibility.