Infineon Technologies MB88121CPMC1-GS-N2E2

Overview

MB88121CPMC1-GS-N2E2 from Cypress (originally Fujitsu) is a FlexRay Application-Specific Standard Product (ASSP) that adds ISO 17458-2-compliant FlexRay connectivity to host microcontrollers lacking embedded FlexRay protocol cores. It integrates Bosch's ERAY IP core, supports dual-channel 10 Mbit/s communication, 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 - used in automotive chassis control modules requiring deterministic, fault-tolerant bus communication.

For engineers reviewing the MB88121CPMC1-GS-N2E2 datasheet, MB88121CPMC1-GS-N2E2 pinout, MB88121CPMC1-GS-N2E2 application, or MB88121CPMC1-GS-N2E2 equivalent, key selection criteria include dual-channel FlexRay v2.1 compliance, SPI/parallel host interface configurability, DMA-assisted buffer access, 64-pin LQFP package compatibility, and −40 °C to +125 °C extended temperature operation for powertrain and ADAS subsystems.

Technical Context

The MB88121CPMC1-GS-N2E2 implements the FlexRay protocol v2.1 specification via Bosch's licensed ERAY controller IP, supporting static/dynamic segment scheduling, cycle-based communication, and network management frames. Its dual-channel transceiver interface enables redundant or split-architecture topologies with independent 10 Mbit/s data rates per channel.

Host interfacing is fully mode-pin configurable: 16-bit multiplexed/non-multiplexed parallel (up to 33 MHz), or SPI (8 Mbit/s). The integrated DMA request unit offloads host CPU by signaling buffer readiness, while on-chip PLL multiplies external 4/5/8/10/16/20 MHz clocks to 80 MHz internal timing - eliminating need for high-frequency crystal oscillators.

Key Specifications

Pinout & Package

The MB88121CPMC1-GS-N2E2 is housed in a 64-pin plastic LQFP (FPT-64P-M03/M24) with 0.5 mm pitch, designed for reflow-compatible surface-mount assembly and thermal reliability in under-hood automotive environments.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TJA1080A and TLF35584, the MB88121CPMC1-GS-N2E2 uniquely integrates full FlexRay protocol processing, message buffering, and host interface logic - reducing BOM count, software complexity, and PCB area versus transceiver-only or SBC-only alternatives.

Availability

MB88121CPMC1-GS-N2E2 is available at Aetrix Electronics and suitable for automotive powertrain control, brake-by-wire systems, ADAS sensor fusion hubs, and electric power steering modules requiring stable component supply across extended product lifecycles.

Supply support for MB88121CPMC1-GS-N2E2 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, Traveo MCUs, PSoC SoCs, and connectivity solutions before integration into Infineon's automotive portfolio.

The MB88121 series belongs to Cypress's automotive ASSP product line, specifically engineered to offload FlexRay protocol processing from host MCUs in safety-critical vehicle networks - targeting chassis, powertrain, and ADAS domains requiring deterministic, fault-tolerant communication.

FAQ

What host microcontrollers are compatible with MB88121CPMC1-GS-N2E2?

The device supports Fujitsu FR32-bit and 16FX 16-bit MCUs via its configurable parallel interface, and any SPI-capable host (e.g., NXP S32K, ST STM32G4) at up to 8 Mbit/s. Mode pins select interface type at power-up - no firmware configuration required. Compatibility is verified for timing-critical read/write cycles up to 33 MHz in parallel mode.

Does MB88121CPMC1-GS-N2E2 support FlexRay v3.0 or later?

No - the MB88121CPMC1-GS-N2E2 implements FlexRay protocol v2.1 exclusively, as confirmed in the Fujitsu datasheet rev 1.48. It does not support v3.0 features such as dynamic payload length extension or enhanced security mechanisms. Future protocol updates were planned by Fujitsu but never released for this part number.

How is the 8 KB message RAM allocated and accessed?

Message RAM is mapped into host address space via parallel or SPI interface and divided into configurable buffers. Each buffer can be assigned as transmit, receive, or FIFO entry, with payload length set per buffer (48–254 bytes). Access uses dedicated input/output buffers to decouple host writes from FlexRay transmission timing - preventing data loss during high-rate messaging.

Can MB88121CPMC1-GS-N2E2 operate with only an external 80 MHz clock?

Yes - the device accepts direct 80 MHz clock input on the X1 pin, bypassing the internal PLL. This mode is documented for MB88121B/C variants and eliminates PLL lock time and jitter concerns. External clock must meet duty cycle (45–55%) and slew rate specifications per datasheet section "Clock Input Requirements" to ensure reliable internal timing.