Infineon Technologies MB88121CPMC1-GE1

Overview

MB88121CPMC1-GE1 from Cypress (originally Fujitsu Semiconductor) is a FlexRay Application-Specific Standard Product (ASSP) that adds protocol-compliant FlexRay 2.1 connectivity to external microcontrollers lacking embedded FlexRay cores. It integrates Bosch's ERAY IP core, supports dual-channel 10 Mbit/s communication, features 8 KB message RAM with configurable buffers (up to 128 × 48-byte or 30 × 254-byte), and operates from a single 3.3 V or 5.0 V supply with internal 1.8 V core regulation - deployed in automotive chassis control networks requiring deterministic, fault-tolerant serial bus communication.

For engineers reviewing the MB88121CPMC1-GE1 datasheet, MB88121CPMC1-GE1 pinout, MB88121CPMC1-GE1 application, or MB88121CPMC1-GE1 equivalent, key selection criteria include dual-channel FlexRay 2.1 compliance, parallel/SPI host interface configurability, DMA-assisted buffer access, on-chip PLL clock multiplication (4/5/8/10/16/20 MHz input → 80 MHz internal), and −40 °C to +125 °C operating temperature range.

Technical Context

The MB88121CPMC1-GE1 implements the FlexRay 2.1 protocol stack via licensed Bosch ERAY IP, supporting static/dynamic segment scheduling, cycle-based message transmission, and network management frames. Its dual-channel transceiver interface enables redundant or split-traffic topologies with independent 10 Mbit/s data rates per channel.

Host integration is supported through three configurable modes: 16-bit multiplexed/non-multiplexed parallel (up to 33 MHz), or SPI (8 Mbit/s). The DMA request unit offloads host CPU by signaling buffer readiness, while programmable message filtering operates on slot counter, cycle counter, and channel ID - all managed via register-mapped memory space accessible through the selected host interface.

Key Specifications

Pinout & Package

The MB88121CPMC1-GE1 is housed in a 64-pin plastic LQFP (FPT-64P-M03/M24) package with 0.5 mm pitch, optimized for automotive PCB thermal and mechanical reliability.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MRD600 and TLF35584, the MB88121CPMC1-GE1 offers unmatched host interface flexibility (parallel/SPI), user-configurable message RAM layout, and wide voltage/temperature range - making it optimal for retrofitting FlexRay into existing MCU platforms without redesigning power or timing subsystems.

Availability

MB88121CPMC1-GE1 is available at Aetrix Electronics and suitable for automotive chassis control, steer-by-wire systems, ADAS fusion hubs, and electric powertrain gateways requiring stable component supply across extended product lifecycles.

Supply support for MB88121CPMC1-GE1 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 embedded solutions for automotive, industrial, and consumer systems, with deep expertise in connectivity, memory, and programmable analog/digital ICs.

The MB88121 series belongs to Cypress's automotive ASSP portfolio, designed specifically to extend FlexRay connectivity to non-FlexRay-capable microcontrollers in safety-critical vehicle networks - emphasizing protocol fidelity, thermal robustness, and host interface adaptability.

FAQ

What host microcontrollers are compatible with MB88121CPMC1-GE1?

The device supports Fujitsu FR32-bit and 16FX 16-bit MCUs natively via its configurable parallel interface, but also works with ARM Cortex-M, Renesas RH850, and NXP S32K families using standard GPIO-controlled parallel or SPI protocols. Mode pins MD0–MD2 determine interface type at power-up; no firmware dependency exists for basic initialization.

Does MB88121CPMC1-GE1 include an integrated FlexRay physical layer?

No - MB88121CPMC1-GE1 is a protocol controller only and requires external FlexRay transceivers (e.g., NXP TJA1080 or Infineon TLF35584) on both Channel A and Channel B. Its TXDA/TXENA/RXDA and TXDB/TXENB/RXDB pins drive differential bus signals through those external PHYs.

How is clock synchronization handled between MB88121CPMC1-GE1 and the host MCU?

Clock domains are isolated: the MB88121CPMC1-GE1 uses its internal PLL (driven by X0/X1) to generate an 80 MHz core clock, while host interface timing is governed by the host's BCLK (in parallel mode) or SCK (in SPI mode). No shared clock is required - handshaking via RDY, CS, and DMA_REQ ensures reliable inter-domain data transfer.

Can MB88121CPMC1-GE1 operate in a single-channel FlexRay configuration?

Yes - though designed for dual-channel redundancy, the device supports single-channel operation by configuring only Channel A (TXDA/RXDA) or Channel B (TXDB/RXDB) in the message RAM and filter registers. Unused channel pins may be left unconnected or terminated per transceiver datasheet guidelines.