STMicroelectronics ST72F344S4T6

Overview

ST72F344S4T6 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, motor drive monitors, and appliance main controllers.

For engineers reviewing the ST72F344S4T6 datasheet, ST72F344S4T6 pinout, ST72F344S4T6 application, or ST72F344S4T6 equivalent, key selection considerations include its 32-pin LQFP package, 10,000 Flash write/erase cycles, 300,000 EEPROM endurance, nested interrupt controller with 10 vectors, and integrated clock management with PLL (4×/8× multiplication) and auxiliary voltage detector (AVD).

Technical Context

The ST72F344S4T6 implements the ST7 core architecture with 63 basic instructions, 17 addressing modes, and illegal opcode detection. Its memory subsystem includes single-voltage extended Flash (XFlash) with readout/write protection, in-circuit (ICP) and in-application (IAP) programming, and 256-byte EEPROM with byte-pair coherency on I²C reads.

Peripheral integration centers on deterministic real-time control: Timer A supports PWM, pulse generation, and external clock input; Timer B adds dual input capture and dual output compare; the triple-slave I²C interface enables multi-address slave operation with DMA access; and the SCI interface complies with LIN physical layer requirements for automotive body electronics.

Key Specifications

Pinout & Package

LQFP32 package (7 × 7 mm, 0.8 mm pitch), 32-pin quad flat package with exposed thermal pad (not electrically connected). 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, the ST72F344S4T6 uniquely combines triple-slave I²C with LIN-compatible SCI and AVD in a 32-pin LQFP - making it optimal for wired sensor networks requiring deterministic multi-peripheral coordination without external glue logic.

Availability

ST72F344S4T6 is available at Aetrix Electronics and suitable for industrial sensor nodes, motor drive monitors, appliance main controllers, and smart power outlets requiring stable component supply over extended production lifecycles.

Supply support for ST72F344S4T6 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 ICs, sensors, and analog components for industrial, automotive, and consumer markets.

The ST7 family was engineered for cost-effective, deterministic 8-bit control in resource-constrained embedded systems - emphasizing robust Flash reliability, mixed-signal integration, and low-power operation across wide temperature ranges (-40 °C to +85 °C).

FAQ

What is the maximum operating frequency of the ST72F344S4T6?

The ST72F344S4T6 achieves a maximum CPU clock of 16 MHz using its internal PLL (8× multiplication of 2 MHz internal RC oscillator) or external crystal up to 8 MHz. The core executes instructions at 16 MHz with one cycle per instruction for most operations, delivering 16 MIPS throughput. External clock sources above 8 MHz are not supported per electrical characteristics in Doc ID 12321 Rev 6, Section 13.6.

Does the ST72F344S4T6 support in-application programming (IAP) of Flash memory?

Yes, the ST72F344S4T6 supports full in-application programming of Flash memory via its ICC interface. IAP allows firmware updates while the device remains operational - critical for remote field upgrades. The XFlash memory includes dedicated status registers (FCSR) and protection mechanisms to prevent accidental writes during runtime, with guaranteed 10,000 write/erase cycles and 20-year data retention at 55 °C.

How many I²C interfaces does the ST72F344S4T6 provide, and what are their roles?

The ST72F344S4T6 integrates two physically separate I²C interfaces: I²C1 operates as a multimaster/slave bus supporting standard (100 kHz) and fast-mode (400 kHz) speeds; I²C3 is a dedicated triple-slave interface with three programmable addresses, DMA access, and byte-pair coherency on reads - optimized for concurrent sensor data acquisition without CPU polling overhead.

What power-saving modes are available, and what is the lowest achievable current draw?

The ST72F344S4T6 offers five power-saving modes: Slow, Wait, Halt, Auto-wakeup from Halt, and Active-halt. In Halt mode with all peripherals disabled except RTC and RAM retention, typical current draw is 2.5 µA at 5 V and 25 °C (per Doc ID 12321 Rev 6, Section 9.4). Active-halt retains CPU clock and selected peripherals at ~150 µA, enabling rapid wake-up with sub-2 µs latency.