Infineon Technologies MB91F525BSCPMC1-GTE1

Overview

MB91F525BSCPMC1-GTE1 from Infineon Technologies (formerly Cypress) is a 32-bit FR81S RISC microcontroller designed for automotive powertrain and body control units. It features an 80 MHz CPU, 768 KB + 64 KB program flash, 96 KB main RAM + 8 KB backup RAM, IEEE 754-compliant FPU, and triple CAN 2.0B controllers supporting up to 1 Mbps. Used in engine control modules requiring deterministic real-time response under -40 °C to +125 °C.

For engineers reviewing the MB91F525BSCPMC1-GTE1 datasheet, MB91F525BSCPMC1-GTE1 pinout, MB91F525BSCPMC1-GTE1 application, or MB91F525BSCPMC1-GTE1 equivalent, key selection criteria include CAN channel count, sub-oscillator support, LVD configuration, RTC calibration capability, and 176-pin LQFP package compatibility with automotive ECU PCB layouts.

Technical Context

The MB91F525BSCPMC1-GTE1 implements the FR81S core with 5-stage pipeline, Harvard architecture, and MPU-enforced privilege separation between user and supervisor modes. It integrates dual A/D converters (12-bit, 48 total channels), three independent CAN controllers with 128-message buffers on Channel 0, and hardware CRC generation for firmware integrity verification.

Its clock system combines main oscillator (4–16 MHz), 32 kHz sub-oscillator, CR-based 100 kHz fallback, and SSCG-enabled PLL with programmable multiplication (1×–20×). Power management includes Sleep, Stop, Watch, and Sub RUN modes, with dedicated low-voltage detection on both external supply (2.8 V ±8%) and internal rails.

Key Specifications

Pinout & Package

MB91F525BSCPMC1-GTE1 is housed in a 176-pin LQFP package (24 mm × 24 mm, 0.5 mm pitch) with exposed thermal pad. Pin functions are defined across four I/O groups (P0–P3), CANH/CANL differential pairs, dedicated reset and clock inputs, and multiplexed peripheral signals including UART, CSIO, LIN, I²C, PPG, and ADC channels.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar 32-bit automotive microcontroller applications.

Compared with RH850/F1K and S32K144, MB91F525BSCPMC1-GTE1 delivers optimal balance of CAN channel density, sub-oscillator RTC accuracy, and FPU-accelerated control math within a mature, production-proven 176-pin LQFP package for cost-constrained ASIL-B ECUs.

Availability

MB91F525BSCPMC1-GTE1 is available at Aetrix Electronics and suitable for engine control units, transmission control modules, and body control modules requiring stable component supply across extended automotive product lifecycles.

Supply support for MB91F525BSCPMC1-GTE1 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

Infineon Technologies is a global semiconductor leader headquartered in Munich, Germany, specializing in power systems, automotive ICs, and security solutions with over 40 years of automotive qualification expertise.

This device belongs to the CY91520 series - a family of FR81S-based microcontrollers engineered specifically for automotive powertrain and chassis control applications demanding high reliability, real-time determinism, and AEC-Q100 Grade 1 compliance.

FAQ

What is the maximum operating frequency and associated instruction timing?

The MB91F525BSCPMC1-GTE1 operates at a maximum CPU frequency of 80 MHz, achieved via on-chip PLL with 20× multiplication of a 4.0 MHz crystal source. This yields a minimum instruction execution time of 12.5 ns per basic instruction, enabling hard real-time loop execution within strict automotive timing budgets.

Does this MCU support CAN FD or only classical CAN 2.0B?

MB91F525BSCPMC1-GTE1 supports only classical CAN 2.0B protocol across its three independent controllers, with maximum bit rates up to 1 Mbps. It does not implement CAN FD framing, payload extension, or variable bit rate switching - confirmed by the absence of FD-specific registers and descriptors in the official register map and peripheral documentation.

How is the 32 kHz sub-oscillator used for RTC calibration?

The sub-oscillator drives the RTC and enables calibration by measuring the ratio between main clock (e.g., 4 MHz) and sub-clock (32.768 kHz) frequencies. The real-time clock prescaler register adjusts the effective division factor to compensate for crystal tolerance and temperature drift, ensuring ±1 ppm accuracy over -40 °C to +125 °C.

Is the 176-pin LQFP package lead-free and RoHS-compliant?

Yes, MB91F525BSCPMC1-GTE1 uses a lead-free, RoHS-compliant 176-pin LQFP package (JEDEC MO-207AC standard) with matte tin plating. The part meets JEDEC J-STD-020D moisture sensitivity level 3 and is qualified for reflow soldering profiles up to 260 °C peak temperature.