STMicroelectronics ST72F344K4T6

Overview

ST72F344K4T6 from STMicroelectronics is an 8-bit Flash microcontroller with 16 Kbytes XFlash program memory, 1 Kbyte RAM, and 256 bytes data EEPROM. It integrates a 10-bit ADC (12-channel), two 16-bit timers (Timer A and B), dual I²C interfaces (including triple-slave I²C3S with DMA), SPI, SCI (LIN-compatible), and PLL-based clock management. It targets embedded control in automotive body electronics and industrial sensor nodes requiring robust in-application programming and low-power operation.

For engineers reviewing the ST72F344K4T6 datasheet, ST72F344K4T6 pinout, ST72F344K4T6 application, or ST72F344K4T6 equivalent, key selection considerations include its 32-pin LQFP package, 4×/8× PLL multiplication, 5 power-saving modes (including auto-wakeup from Halt), 10,000 Flash write/erase cycles, and hardware support for ICP/IAP - all critical for cost-sensitive, field-upgradable embedded systems.

Technical Context

This MCU implements the ST7 core architecture with nested interrupt handling (10 vectors + TRAP/RESET), 17 addressing modes, and 63 basic instructions including 8×8 unsigned multiply. Its clock system combines crystal/ceramic oscillator, high-accuracy internal RC oscillator (±1% at 25°C), and programmable PLL for flexible frequency scaling up to 24 MHz.

The peripheral set is optimized for real-time control: Timer A supports PWM and pulse generation with external clock input; Timer B adds dual input capture and output compare; the triple-slave I²C3S interface enables concurrent slave addressing with byte-pair coherency and DMA access; and the SCI interface meets LIN 1.3 physical layer timing requirements.

Key Specifications

Pinout & Package

LQFP32 package (7 × 7 mm, 0.8 mm pitch) with 32 pins. All I/Os are multifunctional and software-configurable for alternate peripheral functions.

Key Features

Applications

Equivalent & Alternatives

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

Compared with STM8S003F3P6 and ST7FLITE2K4T6, the ST72F344K4T6 uniquely delivers triple-slave I²C with DMA, full IAP capability, and 300,000-cycle EEPROM - making it the only option among the three for secure, upgradable, multi-sensor embedded systems requiring deterministic I²C arbitration and long-term data logging.

Availability

ST72F344K4T6 is available at Aetrix Electronics and suitable for automotive body electronics, industrial sensor nodes, home appliance motor control, and smart metering subsystems requiring stable component supply and long-lifecycle support.

Supply support for ST72F344K4T6 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 ST7 family was engineered for cost-effective, low-power 8-bit embedded control with emphasis on in-system programmability, robust peripheral integration, and automotive-grade reliability - targeting applications where code density, interrupt latency, and field maintenance matter.

FAQ

Does ST72F344K4T6 support in-application programming (IAP) without external tools?

Yes. The ST72F344K4T6 implements full IAP via its built-in ICC interface, allowing firmware updates through SCI or I²C while the device remains operational. This requires no external programmer - only a host processor or bootloader that adheres to the ICC command protocol defined in Section 4.4 of the datasheet.

What is the maximum operating frequency and how is it achieved?

The ST72F344K4T6 achieves up to 24 MHz CPU clock using its integrated PLL with 4× or 8× multiplication of the base oscillator frequency. When driven by an 8 MHz crystal, the 4× PLL yields 32 MHz - but the maximum guaranteed fCPU is 24 MHz due to internal timing constraints and voltage/temperature derating per Section 13.6.

How many I²C addresses can the I²C3S interface handle simultaneously?

The I²C3S interface supports exactly three independent slave addresses concurrently, each with dedicated address registers (I2C3SAR0–I2C3SAR2). It does not support dynamic address switching or broadcast mode - all three addresses are active and monitored in parallel during bus arbitration.

Is the 10-bit ADC calibrated at factory, and what is its typical INL?

The ADC is factory-calibrated for offset and gain; typical integral nonlinearity (INL) is ±1 LSB over the full 0–VDD range at 25 °C and 5 V supply, as specified in Table 19 of the electrical characteristics section. No user calibration is required for basic operation, though self-calibration routines are supported via software.