Infineon Technologies XC8661FRAABKXUMA1

Overview

XC8661FRAABKXUMA1 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 Kbytes of Flash program memory, 256 bytes of RAM, 512 bytes of XRAM, and an 8-channel 10-bit ADC. It operates with a 5.0 V I/O supply and internal 2.5 V core logic supply, targeting automotive motor control applications.

For engineers reviewing the XC8661FRAABKXUMA1 datasheet, XC8661FRAABKXUMA1 pinout, XC8661FRAABKXUMA1 application, or XC8661FRAABKXUMA1 equivalent, key selection criteria include its 16-bit CCU6 capture/compare unit for PWM generation, on-chip PLL with loss-of-lock detection, power-down wake-up via RXD/EXINT0, and AEC-Q100-qualified industrial temperature range (–40 °C to +125 °C).

Technical Context

The XC8661FRAABKXUMA1 implements a two-clock-per-cycle 8051-compatible core with dual data pointers and integrated voltage regulation delivering 2.5 V to the core from a 5.0 V supply. Its peripheral set includes three 16-bit timers (T0/T1/T2), a watchdog timer, UART, synchronous serial channel (SSC), and a dedicated 16-bit capture/compare unit (CCU6) optimized for three-phase motor control timing.

Reset architecture combines power-on, hardware, brownout (for core supply), watchdog, and power-down wake-up sources. Clock generation uses an on-chip oscillator plus PLL with loss-of-lock detection, enabling stable operation across automotive voltage transients and temperature extremes.

Key Specifications

Pinout & Package

XC8661FRAABKXUMA1 is housed in a PG-TSSOP-38 package - a thermally enhanced, surface-mount thin shrink small-outline package with 38 leads, 0.5 mm pitch, and exposed thermal pad for improved heat dissipation in motor control modules.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar 8-bit automotive motor control applications.

Compared with SAK-XC866-2FRA and XC886CN-8FFI, XC8661FRAABKXUMA1 offers minimal footprint and lowest BOM cost for standalone, self-contained motor control where CAN or data logging are unnecessary.

Availability

XC8661FRAABKXUMA1 is available at Aetrix Electronics and suitable for automotive blower control, industrial HVAC fan drivers, electric power steering assist, and appliance motor drive modules requiring stable component supply and long-term lifecycle assurance.

Supply support for XC8661FRAABKXUMA1 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 electronics, and security solutions, with global R&D and manufacturing infrastructure.

XC8661FRAABKXUMA1 belongs to the XC800 family - designed specifically for cost-sensitive, high-reliability 8-bit motor control applications in automotive and industrial environments.

FAQ

What is the maximum operating frequency of the XC8661FRAABKXUMA1?

The XC8661FRAABKXUMA1 supports an external crystal up to 20 MHz, and its internal PLL can multiply this to achieve a core clock of up to 26.67 MHz. The two-clock-per-cycle architecture yields an effective instruction throughput of 13.33 MIPS at maximum PLL output, confirmed in Section 3.2 of the V1.2 datasheet.

Does XC8661FRAABKXUMA1 support in-circuit debugging without external hardware?

Yes - it includes 1 Kbyte of monitor ROM (within the 8 Kbyte Boot ROM) and 64 bytes of monitor RAM, enabling on-chip debug functionality via UART. This allows breakpoint setting, register inspection, and memory read/write without JTAG or external emulators, as detailed in Section 9.3 of the datasheet.

Is the ADC input range compatible with 5 V-tolerant GPIOs?

No - the ADC inputs (P0.0–P0.3) accept analog voltages from 0 V to VREF, where VREF is internally fixed at 2.5 V or externally selectable up to 5.0 V. However, the GPIO pins themselves are 5 V-tolerant only in digital mode; applying >2.5 V to ADC pins without external scaling violates absolute maximum ratings.

What packaging and marking details identify XC8661FRAABKXUMA1?

XC8661FRAABKXUMA1 uses a PG-TSSOP-38 package with exposed thermal pad. Marking includes "XC8661" followed by "FRAABKXUMA1" - where "FRA" denotes 4 Kbyte Flash, automotive qualification, and 5 V supply; "ABK" indicates TSSOP-38 package and SAK temperature grade (–40 °C to +125 °C).