STMicroelectronics ST72F345C4T6

Overview

ST72F345C4T6 from STMicroelectronics is an 8-bit Flash microcontroller featuring 16 Kbytes XFlash program memory, 1 Kbyte RAM, and a 10-bit ADC with 12 input channels. It integrates two 16-bit timers, dual I²C interfaces (including triple-slave I²C with DMA), SPI, SCI (LIN-compatible), and supports in-application programming (IAP) with 10,000 write/erase cycles. It targets embedded control in industrial sensors and motor-driven appliances requiring deterministic real-time response and nonvolatile data logging.

For engineers reviewing the ST72F345C4T6 datasheet, ST72F345C4T6 pinout, ST72F345C4T6 application, or ST72F345C4T6 equivalent, key selection considerations include its 48-pin LQFP package, 5 power-saving modes (including auto-wakeup from Halt), integrated window watchdog, and dual I²C slave capability with byte-pair coherency-critical for multi-node sensor networks and LIN-based automotive body electronics.

Technical Context

This MCU implements the ST7 core with 63 basic instructions, 17 addressing modes, and illegal opcode detection. Its clock system combines a high-accuracy internal RC oscillator (±1% at 25 °C), external crystal support (up to 8 MHz), and a PLL for 4× or 8× frequency multiplication-enabling flexible CPU clock derivation from low-cost resonators or precision crystals.

Interrupt handling uses a nested controller with 10 vectors plus TRAP and RESET, supporting 9 external interrupt lines across 4 vectors. The peripheral set includes a configurable window watchdog timer, real-time base, and dual 16-bit timers with PWM, input capture, and pulse generation-designed for precise timing-critical tasks like motor commutation and sensor sampling synchronization.

Key Specifications

Pinout & Package

LQFP48 package (7 × 7 mm, 0.5 mm pitch) with 48 leads. 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 STM8S105K4T6 and EFM8BB52F16G-A-QFP48, the ST72F345C4T6 uniquely balances I²C concurrency (triple-slave + DMA), LIN-ready SCI, and proven industrial temperature operation (−40 to 85 °C), making it optimal for cost-sensitive, bus-dense embedded controllers where protocol offload and firmware update resilience are mandatory.

Availability

ST72F345C4T6 is available at Aetrix Electronics and suitable for industrial sensor nodes, automotive body electronics, smart appliance motor control, and energy meter data logging requiring stable component supply across multi-year production cycles.

Supply support for ST72F345C4T6 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, real-time embedded control in resource-constrained environments-emphasizing low-voltage operation, robust I/O drive, and integrated peripherals to minimize external components in industrial and appliance applications.

FAQ

What is the maximum operating frequency of the ST72F345C4T6?

The ST72F345C4T6 achieves a maximum CPU clock frequency of 24 MHz using its internal PLL (8× multiplier) with an 3 MHz crystal input, or 8 MHz directly from an external clock source. Electrical characteristics in Section 13.6 of the datasheet confirm timing compliance up to 24 MHz at VDD = 5 V and TA = 85 °C, with setup/hold margins verified across voltage and temperature corners.

Does the ST72F345C4T6 support hardware LIN physical layer compliance?

No-the ST72F345C4T6's SCI interface is LIN 2.0 protocol-compatible (supporting automatic sync-break detection, checksum, and sleep/wake framing) but requires an external LIN transceiver (e.g., TLE6250 or SN65HVDA100) for ISO 17987-2 physical layer compliance. The SCI peripheral handles all protocol-layer functions in hardware, reducing CPU overhead versus software-based LIN stacks.

How many I²C addresses can the ST72F345C4T6 respond to simultaneously?

The ST72F345C4T6 supports up to three independent I²C slave addresses concurrently via its dedicated I²C3 peripheral-verified in Section 11.7.5 "Address handling" of the datasheet. This enables a single MCU to act as three distinct slave devices on the same I²C bus (e.g., separate sensor, actuator, and configuration endpoints), with DMA-assisted data transfer ensuring atomicity.

Is the internal RC oscillator factory-calibrated, and what is its accuracy specification?

Yes-the internal RC oscillator is factory-calibrated to ±1% accuracy at 25 °C and VDD = 5 V, as specified in Section 13.4 "Internal RC oscillator characteristics." Calibration data is stored in option bytes; users may apply user-defined trimming via RCCRH/RCCRL registers to compensate for voltage/temperature drift, achieving ±2% over −40 to 85 °C per characterization data.