Infineon Technologies MB91F526LKBPMC-GSK5E1

Overview

MB91F526LKBPMC-GSK5E1 from Infineon Technologies (formerly Cypress) is a 32-bit FR81S microcontroller designed for automotive powertrain and body control units. It features an 80 MHz CPU, 1024 + 64 KB program flash, 128 KB main RAM + 8 KB backup RAM, integrated CAN 2.0B (3 channels), and IEEE 754-compliant FPU - enabling real-time motor control and sensor fusion in ASIL-B–capable systems.

For engineers reviewing the MB91F526LKBPMC-GSK5E1 datasheet, MB91F526LKBPMC-GSK5E1 pinout, MB91F526LKBPMC-GSK5E1 application, or MB91F526LKBPMC-GSK5E1 equivalent, key selection criteria include its 176-pin LQFP package, -40 °C to +125 °C operation, dual-clock supervision with CR fallback, 12-bit ADC (48 ch), and LIN 2.1 support for distributed vehicle networks.

Technical Context

The MB91F526LKBPMC-GSK5E1 implements the FR81S core - a 5-stage pipelined 32-bit RISC architecture with Harvard memory organization, 16×32-bit general-purpose registers, and hardware multiplier (signed 32-bit in 5 cycles). It supports privilege/user mode execution and includes an MPU with eight configurable protection areas.

Peripheral integration centers on deterministic real-time I/O: three independent CAN controllers (1 Mbps, 128-message buffers on ch.0), twelve multi-function serial interfaces (UART/CSIO/LIN/I²C), and a 48-channel PPG for LED and PWM timing. Clock management includes SSCG, sub-oscillator (32 kHz), CR oscillator (100 kHz), and PLL with 1–20× multiplication.

Key Specifications

Pinout & Package

MB91F526LKBPMC-GSK5E1 uses a 176-pin LQFP (16 × 16 mm, 0.4 mm pitch) package with exposed thermal pad. Pin functions are defined across five I/O groups (P0–P4), CAN/LIN/UART dedicated signal banks, and dual clock input pairs (XIN/XOUT, SXIN/SXOUT).

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 TC375, MB91F526LKBPMC-GSK5E1 delivers optimal balance of real-time determinism, LIN/CAN coexistence, and embedded FPU for mid-tier automotive ECUs - without over-provisioning core count or memory for cost-sensitive body and chassis applications.

Availability

MB91F526LKBPMC-GSK5E1 is available at Aetrix Electronics and suitable for engine control units, body control modules, electric power steering systems, and ADAS sensor hubs requiring stable component supply across extended automotive lifecycles.

Supply support for MB91F526LKBPMC-GSK5E1 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 German semiconductor manufacturer specializing in power management, automotive ICs, and security solutions, with global R&D and manufacturing infrastructure.

This device belongs to the CY91520 series - a family of FR81S-based microcontrollers engineered specifically for functional-safety–aware automotive applications including powertrain, chassis, and body electronics under AEC-Q100 Grade 1 qualification.

FAQ

What is the maximum operating frequency and how is it achieved?

The MB91F526LKBPMC-GSK5E1 achieves 80 MHz system clock using an on-chip PLL with programmable multiplication (1× to 20×) driven by a 4.0 MHz external crystal. The PLL output feeds the CPU core directly, delivering a 12.5 ns minimum instruction execution time. This configuration is validated across the full -40 °C to +125 °C temperature range and 2.7–5.5 V supply.

Does this MCU support LIN 2.1 protocol natively, and what hardware features enable it?

Yes, the MCU integrates dedicated LIN hardware in all twelve serial channels, supporting LIN 2.1 specification including synch break generation/detection, synch delimiter, checksum calculation, and framing error detection. Each LIN channel operates independently with its own baud rate generator and 64-step FIFO, enabling concurrent multi-node communication without CPU overhead.

How does the memory protection unit (MPU) function in safety-critical applications?

The MPU provides eight configurable memory protection regions with separate read/write/execute permissions for privilege and user modes. Each region can be aligned to 32-byte boundaries and assigned to flash, RAM, or peripheral address spaces. In ASIL-B designs, this enforces strict isolation between bootloader, application firmware, and safety monitor tasks - preventing unintended code execution or data corruption.

What are the power supply requirements and low-voltage detection capabilities?

The device requires a single 5 V supply (2.7–5.5 V range), with internal voltage regulation generating 1.2 V core power. It includes dual LVD circuits: one monitors external VDD with factory-set 2.8 V ±8% threshold (configurable per part number), and another monitors internal 1.2 V rail. Both generate reset signals independently and can be enabled/disabled via fuse settings.