STMicroelectronics ST72F344K2T6

Overview

ST72F344K2T6 from STMicroelectronics is an 8-bit Flash microcontroller featuring 16 Kbytes XFlash program memory, 1 Kbyte RAM, 256 bytes data EEPROM, 10-bit ADC with 12 input channels, two 16-bit timers (Timer A and Timer B), dual I²C interfaces (including triple-slave I²C with DMA), SPI, SCI (LIN-compatible), and support for five power-saving modes. It targets embedded control in industrial sensors and motor-driven appliances requiring deterministic real-time response and nonvolatile parameter storage.

For engineers reviewing the ST72F344K2T6 datasheet, ST72F344K2T6 pinout, ST72F344K2T6 application, or ST72F344K2T6 equivalent, key selection considerations include its single-voltage Flash with 10,000 write/erase cycles and 20-year data retention at 55 °C, nested interrupt controller with 10 vectors plus TRAP/RESET, and high-sink I/O capability (up to 12 lines) for direct LED or relay drive without external buffers.

Technical Context

This MCU implements the ST7 core with 63 basic instructions, 17 addressing modes, and illegal opcode detection. Its clock system integrates a programmable PLL (4× or 8× multiplication), internal RC oscillator (±1% accuracy at 25 °C), crystal/ceramic resonator support, and auxiliary voltage detector (AVD) for supply monitoring.

Interrupt handling uses a nested controller with software-priority registers (ISPRX), nine external interrupt lines mapped across four vectors, and dedicated low-power mode wake-up sources including auto-wakeup from Halt mode via timer or external event. The I²C3S peripheral supports three slave addresses with byte-pair coherency on reads and DMA access-enabling robust multi-device sensor bus communication without CPU intervention.

Key Specifications

Pinout & Package

LQFP32 package (7 × 7 mm, 0.8 mm pitch) with 32 pins. Pin functions validated per STMicroelectronics Doc ID 12321 Rev 6, Section 2 "Pin description".

Key Features

Applications

Equivalent & Alternatives

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

Compared with STM8S003F3P6 and EFM8BB10F8G-A-QFN20, ST72F344K2T6 uniquely combines triple-slave I²C with on-chip EEPROM and AVD-making it optimal for cost-sensitive, multi-sensor industrial nodes requiring autonomous voltage monitoring and deterministic bus arbitration.

Availability

ST72F344K2T6 is available at Aetrix Electronics and suitable for industrial sensor nodes, smart appliance control systems, and building automation controllers requiring stable component supply and long-term production continuity.

Supply support for ST72F344K2T6 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 management ICs, and analog/mixed-signal devices for industrial, automotive, and consumer markets.

The ST7 family was engineered for cost-effective, deterministic real-time control in resource-constrained embedded systems-emphasizing Flash endurance, low-voltage operation, and integrated peripherals to minimize external components.

FAQ

What is the maximum operating frequency of the ST72F344K2T6?

The ST72F344K2T6 operates at a maximum CPU frequency of 8 MHz, achieved via its internal PLL configured for 4× or 8× multiplication of the base oscillator (e.g., 1 MHz crystal → 8 MHz system clock). This frequency is guaranteed across the full industrial temperature range (−40 to +85 °C) and supply voltage (2.7–5.5 V).

Does the ST72F344K2T6 support in-application programming (IAP)?

Yes, the ST72F344K2T6 supports IAP through its ICC interface, allowing firmware updates while the device remains operational. The Flash memory is partitioned to enable safe execution from one bank while programming another, with hardware write-protection and erase-cycle counters accessible via FCSR register.

How many I²C interfaces does the ST72F344K2T6 have, and what are their capabilities?

The ST72F344K2T6 features two physically separate I²C interfaces: one standard multimaster/slave I²C supporting clock stretching and 7-bit addressing, and one dedicated triple-slave I²C3S interface with DMA access, three configurable slave addresses, and byte-pair coherency on read operations-designed for reliable multi-master sensor bus integration.

What power-saving modes are available, and which support wake-up via external interrupt?

The ST72F344K2T6 offers five power-saving modes: Slow, Wait, Halt, Active-halt, and Auto-wakeup from Halt. External interrupts (INT0–INT2) can wake the device from Wait, Halt, and Active-halt modes. Auto-wakeup from Halt uses a dedicated prescaler and alarm register (AWUPR/AWUCSR) to trigger wake-up after programmable time intervals without CPU involvement.