STMicroelectronics ST72F63BK2M1

Overview

ST72F63BK2M1 from STMicroelectronics is an 8-bit low-speed USB microcontroller featuring 16 KB HDFlash program memory, 512 bytes RAM, integrated USB 1.5 Mbps transceiver with DFU support, 8-bit ADC (12-channel), and dual communication interfaces (SCI + I²C). It operates at up to 24 MHz and targets embedded human-interface devices requiring compact firmware-upgradable control.

For engineers reviewing the ST72F63BK2M1 datasheet, ST72F63BK2M1 pinout, ST72F63BK2M1 application, or ST72F63BK2M1 equivalent, key selection criteria include USB HID compliance, in-application programming capability, low-voltage detector option, and high-sink I/O drive strength for direct LED/switch interfacing.

Technical Context

This MCU implements the ST7 core with 63 basic instructions and 17 addressing modes, supporting true bit manipulation and 8×8 unsigned multiply. Its clock system includes external 12/24 MHz crystal support, four power modes (Run/Wait/Slow/Halt), and optional LVD with programmable threshold.

The USB interface integrates a 3.3 V regulator, differential transceivers, and DMA support for endpoint 0–2 (configurable IN/OUT), enabling HID-class device operation without external PHY. The 16-bit timer provides input capture, output compare, PWM, and clock input functions-critical for motor timing and signal measurement.

Key Specifications

Pinout & Package

ST72F63BK2M1 is housed in a 40-pin QFN package (6 mm × 6 mm, 0.5 mm pitch) with exposed thermal pad. Pin assignments are validated per ST's Doc ID 7516 Rev 8, Table 3.

Key Features

Applications

Equivalent & Alternatives

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

Compared with ST72F63BK2M1, the BK4M1 offers scalable Flash without peripheral changes, while the STM8S105K4T6C trades integration for modern architecture-making BK2M1 optimal for legacy-compatible, space-constrained HID designs needing zero-external-USB-component implementation.

Availability

ST72F63BK2M1 is available at Aetrix Electronics and suitable for USB human-interface devices, industrial sensor nodes, programmable power switches, and legacy serial-to-USB bridges requiring stable component supply across extended production lifecycles.

Supply support for ST72F63BK2M1 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, analog ICs, and power solutions for industrial, automotive, and consumer markets.

The ST7 family was engineered specifically for cost-sensitive, ultra-low-power embedded control applications demanding USB connectivity, robust I/O drive, and field-upgradable firmware-prioritizing integration and toolchain maturity over raw performance.

FAQ

Does ST72F63BK2M1 support USB suspend/resume functionality?

Yes, the device fully supports USB suspend and resume operations per USB 2.0 specification. During suspend, it enters Wait mode with clock gated to USB logic, drawing <100 µA (typ.). Resume is triggered by bus activity or internal wake-up event, restoring full USB functionality within 10 ms. This enables energy-efficient HID operation with host-directed power management.

What is the maximum operating frequency of the ST72F63BK2M1 core?

The ST72F63BK2M1 core runs at up to 24 MHz, derived from an external crystal oscillator connected to OSCIN/OSCOUT. The internal clock divider allows configurable CPU frequencies (e.g., 8 MHz, 12 MHz, 24 MHz) to balance performance and power consumption. Electrical characteristics in Section 13.5 confirm timing compliance up to 24 MHz across the full temperature range (–40°C to +85°C).

Can the 8-bit ADC operate during Halt mode?

No-the ADC cannot convert during Halt mode. According to Section 11.6.4 of the datasheet, ADC operation requires active clocking and is disabled in Halt mode to minimize current draw. However, the ADC can be configured to trigger conversions upon exit from Halt mode using an external interrupt or watchdog timeout, enabling wake-on-sensor-event functionality.

Is the ST72F63BK2M1 pin-compatible with other ST7263BKx variants?

Yes-ST72F63BK2M1 shares identical QFN40 pinout and electrical characteristics with all ST7263BKx variants (BK1/BK2/BK4/BK6), differing only in Flash size (4/16/32 KB) and ROM configuration. This allows hardware reuse across firmware variants and simplifies design scalability without PCB revision.