STMicroelectronics ST72F63BD6U1TR

Overview

ST72F63BD6U1TR from STMicroelectronics is an 8-bit low-speed USB microcontroller featuring 16 KB Flash 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, supports four power modes (Run/Wait/Slow/Halt), and targets embedded USB peripheral control in industrial human-interface devices.

For engineers reviewing the ST72F63BD6U1TR datasheet, ST72F63BD6U1TR pinout, ST72F63BD6U1TR application, or ST72F63BD6U1TR equivalent, key selection considerations include USB HID compliance, 1.3–5.5 V supply range, high-sink I/O capability (10 mA @ 1.3 V), and in-application programming (IAP) support for field firmware updates.

Technical Context

This MCU implements the ST7 core with 63 basic instructions and 17 addressing modes, including true bit manipulation and 8×8 unsigned multiply. Its USB interface integrates a 3.3 V regulator and transceivers compliant with USB 2.0 low-speed (1.5 Mbps) and HID 1.0 specifications, supporting suspend/resume and three programmable endpoints.

The on-chip 16-bit timer provides input capture, output compare, PWM generation, and clock input functions; the 8-bit ADC delivers up to 12 channels with configurable resolution and sampling timing. Power management includes RAM retention mode and optional low-voltage detector (LVD) for brown-out protection.

Key Specifications

Pinout & Package

ST72F63BD6U1TR is housed in a 34-pin Shrink Small Outline Package (SO34) with 0.65 mm pitch, optimized for compact industrial PCB layouts and compatible with standard SOIC reflow profiles.

Key Features

Applications

Equivalent & Alternatives

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

Compared with ST72F63BD6U1TR, ST72F324BJ4T6 reduces BOM count for basic USB but adds PHY complexity, while STM8S105K4T6C offers higher bandwidth at the cost of HID-class compatibility and increased firmware development effort.

Availability

ST72F63BD6U1TR is available at Aetrix Electronics and suitable for industrial human-interface devices, USB peripheral controllers, programmable logic modules, and legacy equipment adapters requiring stable component supply across extended product lifecycles.

Supply support for ST72F63BD6U1TR 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, specializing in microcontrollers, power management, sensors, and automotive ICs.

The ST7 family was designed specifically for cost-effective, low-power embedded control with integrated USB connectivity-targeting industrial, appliance, and human-interface applications where firmware upgradability and analog integration are critical.

FAQ

Does ST72F63BD6U1TR support USB full-speed (12 Mbps) operation?

No. ST72F63BD6U1TR implements only low-speed USB 2.0 (1.5 Mbps) compliant with HID 1.0. Its integrated transceiver and USB controller lack full-speed signaling capability, PLL-based clock generation, or endpoint buffers required for 12 Mbps operation. Designs requiring full-speed must use STM8 or STM32 USB-capable devices.

What is the minimum operating voltage with LVD enabled?

With the low-voltage detector configured for 2.5 V threshold, ST72F63BD6U1TR guarantees safe reset assertion down to 2.3 V (typical hysteresis 0.2 V). Below this, the device enters reset and holds I/Os in high-impedance state. The absolute minimum supply for functional operation is 1.3 V, but LVD functionality ceases below 2.3 V.

Can the 8-bit ADC perform conversions during Halt mode?

Yes-the ADC can operate in Halt mode with RAM retention active, provided the ADC clock source remains enabled and the analog supply (VDDA/VSSA) is maintained. Conversion results are stored in RAM, and an interrupt may wake the CPU. However, typical current draw increases from <1 µA to ~150 µA during active conversion.

Is external crystal mandatory for USB operation?

Yes. USB low-speed timing requires ±0.25% accuracy, which cannot be met by the internal RC oscillator. A 12 MHz or 24 MHz crystal connected to OSCIN/OSCOUT is mandatory; the USB module derives its 48 MHz clock via internal PLL multiplication (×4 or ×2) from the crystal base frequency.