Infineon Technologies CY91F526BSBPMC1-GTE1

Overview

CY91F526BSBPMC1-GTE1 from Infineon Technologies (formerly Cypress) is a 32-bit FR81S automotive microcontroller with 1024+64 KB program flash, 128 KB main RAM + 8 KB backup RAM, 80 MHz max CPU frequency, IEEE 754-compliant FPU, and integrated CAN 2.0B controllers. It targets engine control units, body control modules, and ADAS domain controllers requiring ASIL-B capable timing, memory protection, and real-time I/O.

For engineers reviewing the CY91F526BSBPMC1-GTE1 datasheet, CY91F526BSBPMC1-GTE1 pinout, CY91F526BSBPMC1-GTE1 application, or CY91F526BSBPMC1-GTE1 equivalent, key selection criteria include its 176-pin LQFP package, dual 12-bit ADC (48-channel total), 3 CAN channels (1×128-message, 2×64-message buffers), sub-32 kHz RTC with calibration, and -40°C to +125°C operation with ECC-protected memory.

Technical Context

The CY91F526BSBPMC1-GTE1 implements the FR81S 32-bit RISC core with 5-stage pipeline, Harvard architecture, and instruction compatibility with the broader FR family. It integrates an on-chip PLL supporting 4–16 MHz crystal input multiplied up to 80 MHz, plus a 100 kHz CR oscillator for fail-safe clock switching.

Peripheral subsystems include three independent CAN controllers (ISO 11898-1 compliant), dual 12-bit successive-approximation ADCs with 1.4 μs conversion time, two 8-bit R-2R DACs, 12-channel multi-function serial interface (UART/CSIO/LIN/I²C), and a memory protection unit (MPU) with eight configurable regions supporting privilege/user mode access control.

Key Specifications

Pinout & Package

This device uses a 176-pin LQFP (16 mm × 16 mm, 0.5 mm pitch) package with exposed thermal pad. Pin functions are defined across five voltage domains (VDD, VSS, AVDD, AVSS, VREFH/VREFL) and support multiple I/O types including 5 V-tolerant, CMOS hysteresis, and analog inputs.

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 S32K344, the CY91F526BSBPMC1-GTE1 delivers optimal balance of CAN message density (128-buffer channel), on-die FPU, and cost-effective 176-LQFP packaging-making it ideal for mid-tier automotive ECUs where deterministic real-time latency and memory reliability outweigh raw MIPS.

Availability

CY91F526BSBPMC1-GTE1 is available at Aetrix Electronics and suitable for engine control units, body control modules, and electric power steering systems requiring stable component supply across extended automotive lifecycles.

Supply support for CY91F526BSBPMC1-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 German semiconductor manufacturer specializing in power management, automotive ICs, and security solutions, with global R&D and manufacturing infrastructure.

This part belongs to the CY91520 series-a family of FR81S-based 32-bit MCUs designed specifically for ASIL-B automotive applications demanding high-integrity real-time control, robust clock supervision, and ECC-protected memory subsystems.

FAQ

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

The CY91F526BSBPMC1-GTE1 achieves 80 MHz maximum CPU frequency using an on-chip PLL that multiplies a 4.0 MHz external crystal by 20×. The PLL supports input ranges from 4–16 MHz and includes SSCG (spread-spectrum clock generation) to reduce EMI. Minimum instruction execution time is 12.5 ns, verified across -40°C to +125°C.

Does this MCU support functional safety standards like ISO 26262?

Yes-the CY91F526BSBPMC1-GTE1 includes hardware features required for ASIL-B compliance: ECC on flash/RAM, lockstep-capable peripherals (CAN, ADC), memory protection unit (MPU), clock failure detection with CR oscillator fallback, and NMI-triggered safe state entry. It is AEC-Q100 Grade 1 qualified and supported by Infineon's safety documentation package.

How many CAN channels does it have and what are their message buffer configurations?

It integrates three independent CAN 2.0B controllers: Channel 0 supports 128 transmit/receive message buffers; Channels 1 and 2 each support 64 message buffers. All channels operate up to 1 Mbps, support mailbox-based prioritization, and include dedicated FIFOs for efficient interrupt handling without CPU polling overhead.

What debug and programming interfaces are supported?

The device supports On-Chip Debug (OCD) via SWD and JTAG interfaces, enabling full-speed real-time trace, hardware breakpoints, memory inspection, and flash programming. It also supports bootloader operation through UART, CAN, or CSIO interfaces for field firmware updates without debugger hardware.