STMicroelectronics ST7FMC1K2B6

Overview

ST7FMC1K2B6 from STMicroelectronics is an 8-bit motor control microcontroller featuring nested interrupts, 8KB Flash program memory, 384-byte RAM, 10-bit ADC with 16 inputs, and integrated brushless DC (BLDC) motor control peripheral with six high-sink PWM outputs. It operates from 4.5–5.5V at ≤8MHz and supports industrial temperature range (−40°C to +85°C), targeting embedded motor drive systems in HVAC blowers, power tools, and appliance compressors.

For engineers reviewing the ST7FMC1K2B6 datasheet, ST7FMC1K2B6 pinout, ST7FMC1K2B6 application, or ST7FMC1K2B6 equivalent, key selection considerations include its dedicated MTC peripheral for trapezoidal/sine-wave inverter control, on-chip operational amplifier/comparator for current regulation, LINSCI™ interface for automotive subsystem communication, and 20mA high-sink I/O capability for direct gate driving.

Technical Context

The ST7FMC1K2B6 implements a proprietary Motor Control Peripheral (MTC) with write-once safety registers, asynchronous emergency stop, and hardware-accelerated rotor position decoding via four analog inputs supporting Hall sensor, encoder, or sensorless back-EMF detection. Its permanent magnet motor coprocessor includes multiplier, programmable blanking windows, and event counters for commutation timing.

It integrates dual 16-bit timers (Timer A/B) with input capture, output compare, PWM, and pulse generation modes; an 8-bit auto-reload timer (ART) delivering four independent PWM outputs with time-base interrupt; and a main clock controller providing real-time base, beep, and clock-out functions - all synchronized under a single enhanced reset and low-voltage supervisor (LVD/AVD) system.

Key Specifications

Pinout & Package

LQFP64 package (14 × 14 mm, 0.5 mm pitch), thermally enhanced for motor control thermal dissipation. Pin mapping validated per ST document RM0013 Rev 13, Figures 3 and 7.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar BLDC motor control applications.

Compared with ST7FMC1K2B6, STSPIN32F0A offers higher integration but less analog flexibility, while XMC4200-F64K256 delivers superior computational power for FOC at the cost of increased design complexity and external component dependency.

Availability

ST7FMC1K2B6 is available at Aetrix Electronics and suitable for HVAC blower control, power tool motor drives, appliance compressor regulation, and industrial fan speed management requiring stable component supply across long-lifecycle production programs.

Supply support for ST7FMC1K2B6 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

STMicroelectronics is a global semiconductor leader headquartered in Geneva, Switzerland, designing and manufacturing microcontrollers, power devices, sensors, and analog ICs for industrial, automotive, and consumer markets.

The ST7MC family was engineered specifically for cost-sensitive, high-volume BLDC motor control applications where deterministic real-time response, integrated analog front-end, and functional safety features are critical - not general-purpose computing.

FAQ

What is the maximum PWM frequency supported by the ST7FMC1K2B6's MTC peripheral?

The MTC peripheral supports PWM frequencies up to 20 kHz when driven by the internal 8 MHz system clock and configured in trapezoidal mode. Frequency is determined by the ART timer prescaler and reload value; higher frequencies reduce resolution due to 8-bit auto-reload register depth.

Does the ST7FMC1K2B6 support sensorless BLDC commutation out of the box?

Yes - it includes hardware-assisted sensorless commutation using back-EMF zero-crossing detection via OAZ comparator and programmable blanking windows to reject PWM noise. The MTC peripheral handles timing, state transitions, and emergency stop without CPU intervention.

Can the on-chip operational amplifier be used for motor phase current amplification?

Yes - the OAP/OAN differential input pair is designed for current shunt amplification. With typical gain-bandwidth product of 1.5 MHz and rail-to-rail output, it directly interfaces with 10-bit ADC inputs for closed-loop current regulation in both high- and low-side configurations.

Is LINSCI™ functionality available on all I/O pins or only specific ones?

LINSCI™ uses dedicated pins PB4 (MISO), PB5 (MOSI), PB6 (SCK), and PB7 (SS) in SPI mode or PB4 (TXD), PB5 (RXD), and PB6 (LIN wake-up) in LINSCI mode - not configurable on arbitrary GPIO. Pin multiplexing is fixed per the device's alternate function mapping in RM0013.