Infineon Technologies MB91F526LKBPMC-GSK5E2

Overview

MB91F526LKBPMC-GSK5E2 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, 1024 + 64 KB program flash, 128 KB main RAM + 8 KB backup RAM, IEEE 754-compliant FPU, and integrated CAN 2.0B controllers (3 channels, up to 1 Mbps). It operates across −40 °C to +125 °C with 5 V supply and supports sub-oscillator-based RTC and low-voltage detection reset.

For engineers reviewing the MB91F526LKBPMC-GSK5E2 datasheet, MB91F526LKBPMC-GSK5E2 pinout, MB91F526LKBPMC-GSK5E2 application, or MB91F526LKBPMC-GSK5E2 equivalent, key selection criteria include its 176-pin LQFP package, dual 12-bit A/D converters (max 48 ch), LIN 2.1 support, hardware watchdog, memory protection unit (MPU), and automotive-grade temperature and reliability specifications.

Technical Context

The MB91F526LKBPMC-GSK5E2 implements the FR81S core - a 5-stage pipelined 32-bit RISC architecture with 16 × 32-bit general-purpose registers, 16-bit fixed-length instructions, and single-cycle execution for basic operations. It integrates a PLL clock multiplier (1×–20×) enabling 80 MHz operation from a 4 MHz crystal, plus a 100 kHz CR oscillator for fail-safe clock switching.

Peripheral integration includes three independent CAN controllers (128/64 message buffers per channel), 12-channel multi-function serial interface supporting UART, CSIO (SPI), LIN, and I²C, a 48-channel PPG for LED/timing control, and dual 12-bit A/D converters with 1.4 μs conversion time - all accessible via a 22-bit address / 16-bit data external bus interface.

Key Specifications

Pinout & Package

MB91F526LKBPMC-GSK5E2 is housed in a 176-pin LQFP package (24 mm × 24 mm, 0.5 mm pitch) with exposed thermal pad. Pin functions are organized into dedicated groups: power/ground (VDD/VSS), clock inputs (XIN/XOUT, SUBIN/SUBOUT), reset (RES), debug (OCD), CAN (CANRX0–2, CANTX0–2), and multiplexed GPIOs supporting peripheral functions including PPG, A/D, D/A, UART, SPI, LIN, and I²C.

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 TC375TA, the MB91F526LKBPMC-GSK5E2 delivers optimal balance of real-time determinism, integrated analog/mixed-signal peripherals (PPG, dual ADC, LIN), and automotive qualification at lower system cost - especially where FPU-assisted control and flexible GPIO mapping are prioritized over raw MIPS or safety certification overhead.

Availability

MB91F526LKBPMC-GSK5E2 is available at Aetrix Electronics and suitable for automotive ECU development, transmission control modules, and body electronics requiring stable component supply, long-term lifecycle support, and AEC-Q100 Grade 1 qualification.

Supply support for MB91F526LKBPMC-GSK5E2 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 MCUs, and security solutions, with global manufacturing and R&D infrastructure.

This device belongs to the CY91520 series - a family of FR81S-based 32-bit microcontrollers engineered specifically for automotive powertrain, chassis, and body control applications demanding high reliability, mixed-signal integration, and extended temperature operation.

FAQ

What is the maximum operating frequency and required clock source for MB91F526LKBPMC-GSK5E2?

The MB91F526LKBPMC-GSK5E2 achieves a maximum operating frequency of 80 MHz using its on-chip PLL with a 4.0 MHz crystal input multiplied by 20×. It also supports main oscillation from 4–16 MHz crystals, sub-oscillation at 32.768 kHz for RTC, and a built-in 100 kHz CR oscillator for fail-safe clock switching during main clock failure.

Does MB91F526LKBPMC-GSK5E2 support functional safety standards like ISO 26262?

Yes - the MB91F526LKBPMC-GSK5E2 is AEC-Q100 Grade 1 qualified (−40 °C to +125 °C), includes ECC on flash and RAM, hardware/software watchdog timers, memory protection unit (MPU), and clock supervision - all foundational elements for ASIL-B compliance. Full ISO 26262 certification requires system-level implementation, but the silicon provides necessary hardware safety mechanisms.

How many CAN channels does MB91F526LKBPMC-GSK5E2 integrate, and what are their message buffer configurations?

The MB91F526LKBPMC-GSK5E2 integrates three independent CAN 2.0B controllers. Channel 0 supports 128 message buffers (64 transmit + 64 receive), while channels 1 and 2 each support 64 message buffers (32 transmit + 32 receive). All channels operate up to 1 Mbps and support mailbox-based filtering and priority arbitration.

Is the MB91F526LKBPMC-GSK5E2 pin-compatible with other CY91F52x devices in the same package variant?

Yes - within the 176-pin LQFP package family (e.g., CY91F526LKBPMC), pinouts are fully compatible across CY91F522–CY91F526 variants. Peripheral pin assignments, power/ground locations, and debug interfaces remain identical; only memory size and certain peripheral counts (e.g., GPIOs, ADC channels) differ - enabling scalable hardware design with software differentiation.