STM32U585QII3

STM32U585QII3 is a high-end MCU from STMicroelectronics’ STM32U5 family. It combines an Arm Cortex-M33 core with TrustZone-M for secure execution and isolation, running up to about 160 MHz. It targets secure IoT and embedded applications with strong crypto capabilities and energy efficiency.
Key points:
- CPU and security: Cortex-M33, TrustZone-M, secure boot and secure firmware updates.
- Memory: up to ~2 MB Flash and up to ~640 KB RAM.
- Cryptography: hardware accelerators for AES, SHA, RNG (true RNG), plus related security features.
- Peripherals: USB Full-Speed, CAN, multiple USART/UART, I2C, SPI/I2S, ADCs/DACs, timers, and other standard STM32 peripherals; supports LCD/TFT displays and rich analog features.
- Power: multiple low-power modes for long battery life.
- Development: supported by STM32CubeMX/IDE, HAL/LL libraries, and security-focused toolchains.
The QII3 suffix denotes a specific package/pin configuration of the device. Suitable for secure embedded systems, IoT gateways, and industrial controllers.

Direct equivalents do not exist; ST does not publish a one‑to‑one cross reference for STM32U585QII3. Closest substitutes are other STM32U5 devices with a similar Cortex‑M33 core and memory/peripherals, such as STM32U585 variants and STM32U595 family in comparable packages. To find exact pin‑ and feature‑compatible options, use ST’s Product Selector and filter by Cortex‑M33, U5 family, package, memory size, and peripheral set.

Key features of STM32U585QII3:
- CPU: Arm Cortex-M33 with TrustZone-M, up to 160 MHz
- Memory: on-chip Flash up to ~2 MB; RAM up to ~640 KB (package dependent)
- Security: hardware crypto accelerators (AES/DES/SHA), RNG, Public Key Accelerator, secure boot, secure firmware update, TrustZone isolation
- Peripherals: USB Type-C/OTG FS, CAN FD, multiple UART/USART, SPI/QSPI, I2C, I2S
- Analog/Digital: up to 16-channel 12-bit ADC, 2x 12-bit DAC, multiple timers and PWM
- Memory interfaces: Quad/Octal SPI (OSPI) external memory support
- Power/voltage: wide VDD range (approximately 1.65–3.6 V), multiple low-power modes
- Misc: LCD/TFT controller, DMA, rich mix of timers, clock/calendar, debug (SWD/JTAG)
- Package: QII3 variant
Note: exact RAM/Flash sizes vary by specific package/configuration.

- Pin count: 208-pin LQFP (package code QII3)
- Function: 32-bit ARM Cortex-M33 microcontroller (STM32U585 family) for embedded applications, with integrated memory and peripherals (USB, CAN, Ethernet, SPI/I2C/UART, ADC/DAC, crypto, etc.).

- Manufacturer: STMicroelectronics (ST).
- What kind of company: A multinational semiconductor company (an integrated device manufacturer, IDM) that designs, manufactures, and sells a wide range of chips, including microcontrollers (STM32), sensors, analog and power devices. HQ in Geneva, Switzerland; formed in 1987 from a French-Italian merger; publicly traded on Euronext Paris and Borsa Italiana (and NYSE as ADR).

STM32U585QII3 is a secure MCU with TrustZone-M and hardware crypto, ideal for:
- Industrial automation and motor control
- Building/home automation and smart meters
- IoT gateways, edge devices and sensor hubs
- Medical devices and wearable health monitors
- Consumer electronics, handhelds and HMI panels
- Secure data logging, asset tracking and access control

STM32U585QII3 comes in an LQFP package, specifically LQFP-144 (144-pin).