STMicroelectronics ST72F622L2M1

Overview

ST72F622L2M1 from STMicroelectronics is an 8-bit Flash-based microcontroller optimized for low-speed USB peripheral applications, featuring 8 KB dual-voltage Flash program memory, 384 bytes RAM (with 128-byte stack), integrated USB 2.0 interface with 3 endpoints and on-chip 3.3 V regulator, 10-bit ADC with up to 8 input channels, and two 8-bit timers (ART and TBU). It operates from 4.0–5.5 V and supports industrial temperature range (0°C to +70°C) in LQFP44 package.

For engineers reviewing the ST72F622L2M1 datasheet, ST72F622L2M1 pinout, ST72F622L2M1 application, or ST72F622L2M1 equivalent, this MCU is selected for embedded USB HID devices, sensor interface modules, and cost-sensitive industrial control nodes where integrated USB transceivers, low-power operation, and Flash reprogrammability are required.

Technical Context

The ST72F622L2M1 implements a proprietary 8-bit ST7 core with 63 instructions, true bit manipulation, and 17 addressing modes-including indirect and auto-increment-enabling compact firmware for resource-constrained USB peripherals. Its USB interface integrates a Serial Interface Engine (SIE), DMA support, suspend/resume logic, and internal 3.3 V regulator, eliminating external level-shifting components.

Peripheral integration includes an 8-bit Auto-Reload Timer (ART) with two PWM outputs and two input capture inputs, a Time Base Unit (TBU) for periodic interrupts, asynchronous SCI and synchronous SPI interfaces, and a 10-bit ADC with configurable sampling time and conversion trigger sources (timer, software, external event).

Key Specifications

Pinout & Package

LQFP44 package (10 × 10 mm, 0.8 mm pitch) with exposed thermal pad; requires external connection of VDDA to VDD and VSSA to VSS; Pin 39 is reserved and must remain unconnected.

Key Features

Applications

Equivalent & Alternatives

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

Compared with ST72F621K4, the ST72F622L2M1 trades memory capacity for lower unit cost and smaller die size; versus STM8S105K4T6, it retains legacy ST7 toolchain compatibility but lacks modern USB error recovery features and lower quiescent current in HALT mode.

Availability

ST72F622L2M1 is available at Aetrix Electronics and suitable for USB HID peripherals, industrial sensor interfaces, and embedded firmware updater modules requiring stable component supply and long-lifecycle support.

Supply support for ST72F622L2M1 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-sensitive, low-power embedded USB applications-emphasizing integrated analog peripherals, Flash reprogrammability, and minimal external component count.

FAQ

What USB speed and compliance level does the ST72F622L2M1 support?

The ST72F622L2M1 supports Low-Speed USB 2.0 (1.5 Mbps) with full compliance to USB Specification Rev 2.0. It integrates a Serial Interface Engine (SIE), on-chip 3.3 V regulator, and differential transceivers-requiring only a 1.5 kΩ pull-up resistor on USBDP for host enumeration. No external PHY is needed.

Can the ST72F622L2M1 perform Flash programming while operating from a 5 V supply?

Yes. The ST72F622L2M1 supports In-Circuit Programming (ICP) and In-Application Programming (IAP) using dual-voltage Flash technology. While operating from 5 V, it internally generates the 1.8 V required for Flash write/erase cycles-no external high-voltage programming signal is necessary.

How many simultaneous analog inputs can the 10-bit ADC acquire?

The 10-bit ADC supports up to 8 single-ended analog inputs (AIN0–AIN7) on Port A pins. It performs sequential conversions under software or timer trigger, with conversion time of 13 µs per channel at maximum clock rate. Simultaneous sampling is not supported.

What are the key power-saving modes and their typical current draw?

The ST72F622L2M1 offers WAIT (CPU stopped, peripherals active, ~200 µA), SLOW (reduced clock, ~80 µA), and HALT (all clocks stopped except LSI, ~1 µA with ADC off). HALT mode retains RAM content and supports wake-up via RESET, USB resume, or external interrupt.