Infineon Technologies SAF-XC866L-4FRI BE

Overview

SAF-XC866L-4FRI BE from Infineon Technologies is an 8-bit single-chip microcontroller based on the XC800 core, compatible with the standard 8051 instruction set and executing instructions at two clocks per machine cycle. It integrates 12 KB of program Flash, 4 KB of data Flash, 8 KB Boot ROM, 256 bytes RAM, and 512 bytes XRAM, operating at 5.0 V supply with industrial temperature range (–40 °C to +85 °C). It targets embedded motor control and industrial automation systems requiring integrated ADC, PWM, UART, and SSC.

For engineers reviewing the SAF-XC866L-4FRI BE datasheet, SAF-XC866L-4FRI BE pinout, SAF-XC866L-4FRI BE application, or SAF-XC866L-4FRI BE equivalent, this page provides verified technical context, package mapping, functional role in real-time control loops, memory protection scheme details, and validated alternative options for cost-optimized industrial MCU migration.

Technical Context

The SAF-XC866L-4FRI BE implements a two-clock-per-cycle 8051-compatible core with dual data pointers and on-chip voltage regulation (2.5 V core logic from 5.0 V I/O supply). Its CCU6 capture/compare unit supports 16-bit PWM generation with dead-time insertion, while the 10-bit 8-channel ADC enables analog sensor interfacing with configurable sampling timing.

It features LIN Bus Support (LIN BSL), hardware-based memory protection for Flash pages, and multiple reset sources including power-on, brownout, watchdog, and wake-up resets. Clock generation includes internal oscillator plus PLL with loss-of-lock detection, supporting precise timing for motor commutation and serial communication.

Key Specifications

Pinout & Package

SAF-XC866L-4FRI BE is housed in a PG-TSSOP-38 package - thermally enhanced thin-shrink small-outline package with 38 leads, 0.5 mm pitch, and exposed thermal pad for improved heat dissipation in motor drive applications.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar 8-bit industrial microcontroller applications.

Compared with SAF-XC866L-4FRI BE, SAF-XC886L-4FRI offers higher performance within the same 8-bit footprint and toolchain, while SAF-XE164FN-40F shifts to 16-bit architecture with CAN-making it appropriate for networked systems but increasing BOM cost and design complexity.

Availability

SAF-XC866L-4FRI BE is available at Aetrix Electronics and suitable for industrial motor control, sensor node development, and smart power outlet designs requiring stable component supply, long-term lifecycle support, and automotive-qualified manufacturing traceability.

Supply support for SAF-XC866L-4FRI BE 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 AG is a German semiconductor manufacturer specializing in power management, automotive ICs, and microcontrollers, with global R&D and manufacturing infrastructure.

The XC800 family-including SAF-XC866L-4FRI BE-is designed for cost-sensitive industrial and automotive body electronics applications requiring robust real-time control, integrated analog peripherals, and flash-based field-upgradability.

FAQ

What is the maximum operating frequency of the SAF-XC866L-4FRI BE?

The SAF-XC866L-4FRI BE operates at up to 20 MHz with its internal PLL enabled and external crystal input. The core executes instructions at two clocks per machine cycle, achieving effective throughput comparable to a 10-MHz standard 8051. Frequency stability is maintained across the full industrial temperature range (–40 °C to +85 °C) with PLL lock detection active.

Does SAF-XC866L-4FRI BE support in-system programming (ISP)?

Yes, SAF-XC866L-4FRI BE supports in-system programming via its built-in LIN Bus Support (LIN BSL) bootloader. Firmware updates can be performed over the LIN physical layer using standard LIN protocol frames, eliminating the need for JTAG or external programmers. The bootloader resides in protected Boot ROM and validates incoming code before writing to Flash.

How is memory protection implemented on SAF-XC866L-4FRI BE?

Memory protection uses a password-protected register (PASSWD.PASS) to enable/disable write access to individual Flash pages. Each page (typically 512 bytes) must be unlocked with the correct 16-bit password before programming or erasure. This prevents accidental corruption of boot code or calibrated parameters during field updates or debug sessions.

Can SAF-XC866L-4FRI BE operate with a 3.3 V supply?

No-SAF-XC866L-4FRI BE is specified only for 5.0 V ±5 % operation. While the core logic runs at 2.5 V internally, the I/O and analog supply pins (VDD, VDDP) require 5.0 V. For 3.3 V operation, Infineon offers the SAF-XC866L-4FRI 3V variant (orderable part number SAF-XC866L-4FRI 3V), which shares identical functionality but is characterized for 3.3 V ±10 % supply.