STMicroelectronics STM32L4S9ZIT6

Overview

STM32L4S9ZIT6 from STMicroelectronics is an ultra-low-power Arm® Cortex®-M4 32-bit MCU with FPU, 120 MHz max frequency, 2 MB Flash, 640 KB SRAM, and integrated MIPI DSI host controller + LCD-TFT controller. It delivers 150 DMIPS and supports advanced graphics via Chrom-ART Accelerator (DMA2D) and Chrom-GRC (GFXMMU), targeting battery-powered HMI displays in industrial and medical edge devices.

For engineers reviewing the STM32L4S9ZIT6 datasheet, STM32L4S9ZIT6 pinout, STM32L4S9ZIT6 application, or STM32L4S9ZIT6 equivalent, key selection criteria include its dual-bank read-while-write Flash, 33 nA Shutdown mode, 2.8 μA Stop 2 with RTC, AES+HASH hardware acceleration, and UFBGA144 (10 × 10 mm, 0.4 mm pitch) package compatibility with high-density display interface routing.

Technical Context

This MCU integrates a tightly coupled interconnect matrix enabling concurrent access to Flash, SRAM, and peripherals without bus contention. Its adaptive real-time accelerator (ART) eliminates Flash wait states at 120 MHz, while the FlexPowerControl architecture enables dynamic voltage scaling across seven low-power modes - including 420 nA Standby with RTC and 5 µs wakeup from Stop.

The device features three independent PLLs (system, USB/audio, ADC), dual Octo-SPI interfaces supporting XIP from external flash, and a dedicated MIPI D-PHY PLL delivering two 500 Mbit/s DSI lanes for driving high-resolution TFT panels. Analog subsystem includes dual 12-bit DACs, two op-amps with PGA, and a 12-bit 5 Msps ADC with hardware oversampling up to 16-bit resolution.

Key Specifications

Pinout & Package

STM32L4S9ZIT6 is housed in a 144-ball Ultra-Fine-Pitch Ball Grid Array (UFBGA144) package with 0.4 mm ball pitch and 10 mm × 10 mm body size. This package supports high I/O density and thermal performance for compact display-integrated designs.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar ultra-low-power MCU applications.

Compared with STM32L4R9ZIJ6, STM32L4S9ZIT6 adds MIPI DSI for compact high-speed display links; versus STM32H743ZIT6, it trades raw performance for 3.5× lower Run-mode current and native UFBGA144 support - making it optimal for space-constrained, battery-sensitive HMI designs.

Availability

STM32L4S9ZIT6 is available at Aetrix Electronics and suitable for industrial HMI panels, portable medical monitors, smart energy meters, and automotive diagnostic tools requiring stable component supply, long-term lifecycle assurance, and qualified sourcing for production ramp.

Supply support for STM32L4S9ZIT6 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 products for industrial, automotive, and consumer markets.

The STM32L4 series targets ultra-low-power embedded applications demanding rich peripherals, graphics capability, and security - specifically engineered for battery-operated HMI, IoT edge nodes, and portable medical devices where energy efficiency and integration are critical.

FAQ

What is the maximum operating temperature range for STM32L4S9ZIT6?

The STM32L4S9ZIT6 is rated for industrial temperature operation from –40 °C to +85 °C. This range is validated per ST's production qualification standards and applies to all functional blocks including Flash, SRAM, analog peripherals, and MIPI DSI PHY - ensuring reliable operation in enclosed enclosures or unventilated industrial cabinets.

Does STM32L4S9ZIT6 support external memory interfaces beyond Octo-SPI?

Yes - it integrates a Flexible Static Memory Controller (FSMC) supporting SRAM, PSRAM, NOR, NAND, and FRAM memories with programmable timing. Combined with dual Octo-SPI, this provides three independent high-bandwidth external memory paths: one parallel (FSMC) and two serial (Octo-SPI), enabling flexible memory architecture for display framebuffers and firmware storage.

Can the MIPI DSI interface drive both command-mode and video-mode displays?

Yes - the MIPI DSI Host controller supports both command-mode (for static UI elements and partial updates) and video-mode (for continuous streaming of moving content). It includes dedicated DSI command engine, video packet generator, and error correction logic, allowing simultaneous use of both modes in hybrid display architectures.

Is the 96-bit unique ID accessible via standard debug interfaces?

No - the 96-bit unique ID is readable only via the DBGMCU_IDCODE register during debug session with SWD/JTAG, and is not exposed through system memory or peripheral registers. Access requires authenticated debug connection and is protected against readout when Readout Protection (RDP) Level 2 is enabled.