Infineon Technologies XC8661FRIABFXUMA1

Overview

XC8661FRIABFXUMA1 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 4 KB of program Flash, 4 KB of data Flash, 256 bytes of RAM, 512 bytes of XRAM, and 8 KB of Boot ROM with on-chip debug monitor. It features an 8-channel 10-bit ADC, three 16-bit timers (T0/T1/T2), CCU6 capture/compare unit for PWM, UART, SSC, and operates across –40 °C to +85 °C in industrial-grade PG-TSSOP-38 package.

For engineers reviewing the XC8661FRIABFXUMA1 datasheet, XC8661FRIABFXUMA1 pinout, XC8661FRIABFXUMA1 application, or XC8661FRIABFXUMA1 equivalent, this device supports embedded motor control, industrial sensor interface, and LIN-compliant communication systems where deterministic timing, low-power operation, and integrated analog-peripheral coexistence are required.

Technical Context

The XC8661FRIABFXUMA1 implements a two-clock-per-cycle 8051-compatible core with dual data pointers and on-chip voltage regulation (2.5 V core supply from 3.3 V or 5 V I/O supply). Its memory architecture separates P-Flash (4 KB) and D-Flash (4 KB), both supporting memory protection and bit-level write control via PASSWD register access.

Peripheral integration includes a 10-bit SAR ADC with 8 input channels, CCU6 for high-resolution PWM generation with dead-time insertion, and asynchronous UART plus synchronous SSC for serial communication. Reset sources include power-on, brownout (for 2.5 V core), watchdog, and external interrupt wake-up from power-down mode.

Key Specifications

Pinout & Package

XC8661FRIABFXUMA1 is housed in a 38-pin PG-TSSOP package with exposed thermal pad, optimized for industrial PCB assembly and thermal dissipation in compact motor-control modules.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SAK-XC866-4FRI and XC886CN-8FFI, XC8661FRIABFXUMA1 offers optimal cost/performance balance for Flash-constrained, UART/SSC-based industrial control where CAN is unnecessary and memory headroom is limited.

Availability

XC8661FRIABFXUMA1 is available at Aetrix Electronics and suitable for motor control subsystems, industrial sensor nodes, LIN bus nodes, and smart power actuators requiring stable component supply across extended lifecycle planning.

Supply support for XC8661FRIABFXUMA1 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 for industrial and automotive applications.

The XC800 family-including XC866-was designed specifically for cost-sensitive, high-reliability embedded control in motor drives, lighting, and body electronics, emphasizing integrated analog peripherals and low-power operation.

FAQ

What is the maximum operating frequency of the XC8661FRIABFXUMA1?

The XC8661FRIABFXUMA1 supports up to 26.67 MHz oscillator input with internal PLL enabling a maximum CPU clock of 26.67 MHz. At this frequency, the two-clock-per-cycle architecture delivers effective throughput equivalent to a 13.3 MHz standard 8051, with zero-wait-state memory access for both Flash and RAM.

Does XC8661FRIABFXUMA1 support in-system programming (ISP)?

Yes - the device supports ISP via UART using the built-in 1 KB monitor ROM and 64 B monitor RAM. Programming requires no external debugger; only a UART interface and valid hex file. The 4 KB D-Flash allows safe storage of calibration data or configuration parameters during field updates.

Is the ADC input range dependent on the VDDP supply voltage?

Yes - the ADC reference is internally tied to VDDP, so full-scale input is 0 to VDDP (3.3 V or 5.0 V). Input channels tolerate up to VDDP + 0.3 V, but accurate conversion requires analog signals within 0–VDDP. External voltage dividers are needed for higher-voltage sensor signals.

Can XC8661FRIABFXUMA1 operate in power-down mode with RTC functionality?

No - the device lacks a dedicated real-time clock peripheral. While it supports power-down mode with wake-up via UART RXD or EXINT0, timekeeping requires external circuitry or software emulation using Timer 2 in slow-down mode with external crystal, which consumes more current than true RTC ICs.