STMicroelectronics ST72F324LK6T6

Overview

ST72F324LK6T6 from STMicroelectronics is an 8-bit Flash-based microcontroller with 32KB HD-Flash program memory, 1024 bytes RAM, 10-bit ADC (12-channel), four 16-bit timers (including RTC/beeper), SPI and SCI serial interfaces, and operation across 2.85–3.6V at –40°C to +85°C in LQFP32 package. It targets embedded control in industrial sensors and motor drive supervision where low-voltage robustness and mixed-signal integration are critical.

For engineers reviewing the ST72F324LK6T6 datasheet, ST72F324LK6T6 pinout, ST72F324LK6T6 application, or ST72F324LK6T6 equivalent, this MCU delivers deterministic real-time response via nested interrupt controller (10 vectors), configurable watchdog, and dual-clock domain management - essential for safety-critical firmware updates and power-constrained edge nodes.

Technical Context

The ST72F324LK6T6 implements a Harvard architecture with separate instruction and data buses, supporting 63 basic instructions and 17 addressing modes including indexed and indirect indexed. Its CPU core operates at up to 8 MHz system clock derived from internal RC oscillator, external crystal (1–8 MHz), or PLL-multiplied source.

Peripheral integration includes a Main Clock Controller with real-time base, beep generator, and clock-out capability; two independent 16-bit timers (Timer A and Timer B) each supporting input capture, output compare, PWM, and pulse generation; and a 10-bit successive-approximation ADC with programmable sampling time and scan mode.

Key Specifications

Pinout & Package

LQFP32 (7 × 7 mm, 0.8 mm pitch) package with 32-pin square outline, thermally enhanced exposed pad (EPAD) for improved heat dissipation in continuous operation.

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-QSOP24, the ST72F324LK6T6 uniquely integrates RTC, beeper, and 12-channel ADC in LQFP32 - making it optimal for cost-sensitive, function-rich industrial controllers where audio feedback and time-stamped sensor logging are mandatory.

Availability

ST72F324LK6T6 is available at Aetrix Electronics and suitable for industrial sensor nodes, motor drive supervision modules, smart meter interface units, and PLC I/O expanders requiring stable component supply across extended product lifecycles.

Supply support for ST72F324LK6T6 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, MEMS, and analog devices for industrial, automotive, and consumer markets.

The ST7 family was engineered for cost-effective, low-power 8-bit control in resource-constrained embedded systems - emphasizing Flash endurance, mixed-signal integration, and toolchain maturity for rapid industrial firmware development.

FAQ

Does ST72F324LK6T6 support in-circuit programming (ICP)?

Yes, the ST72F324LK6T6 supports In-Circuit Programming via the ICC interface using standard ST-LINK or compatible debuggers. ICP allows full Flash memory erase, program, and verify operations without removing the device from the PCB, enabling production line programming and field rework. The ICCSEL/VPP pin selects between normal operation and programming mode.

What is the maximum ADC conversion rate and accuracy specification?

The 10-bit ADC achieves up to 100 kSPS maximum sampling rate with ±1 LSB integral nonlinearity (INL) and ±1.5 LSB differential nonlinearity (DNL) over the full temperature range. Accuracy is maintained with external reference voltage (VREF) or internal 2.5V bandgap reference, and sampling time is software-configurable to optimize SNR for varying source impedances.

Can ST72F324LK6T6 operate from a single 3.3V supply without level shifting?

Yes, the ST72F324LK6T6 is fully specified for 2.85–3.6V operation and all I/O pins are 5V-tolerant only on designated inputs (e.g., RESET, INTx). For direct connection to 3.3V peripherals, no level shifting is required; however, driving 5V-tolerant inputs mandates external pull-up resistors or clamping diodes per datasheet Section 12.8.

How does the PLL affect system clock stability and jitter?

The integrated PLL provides 2× frequency multiplication of the input clock (1–4 MHz range) to generate up to 8 MHz system clock. Measured jitter is <1.5% period deviation under stable supply conditions, and PLL lock time is ≤100 µs. Stability is ensured by internal loop filter; no external components are required, simplifying layout versus discrete PLL solutions.