STM32U385VGI6 [STMicroelectronics]

The STM32U385xx devices belong to an ultra low-power microcontrollers family (STM32U3 series) based on the high-performance Arm^® Cortex^®-M33 32-bit RISC core. They operate at a frequency of up to 96 MHz.

The Cortex^®-M33 core features a single‑precision FPU (floating‑point unit), that supports all the Arm^® single‑precision data‑processing instructions and all the data types.

The Cortex^®-M33 core also implements a full set of DSP (digital signal processing) instructions and a MPU (memory protection unit) that enhances the application security.

STM32U3 series are the first STM32 series based on near-threshold voltage technology to deliver breakthrough improvement in battery life. With near-threshold technology, STM32U3 devices reduce the active consumption down to 10uA/MHz, resulting in far longer battery life for any application.

The devices embed high‑speed memories (1‑Mbyte flash memory and 256‑Kbytes SRAM), one Octo/Quad-SPI flash memory interface, an extensive range of enhanced I/Os, peripherals connected to three APB buses, two AHB buses, and a 32‑bit multi‑AHB bus matrix.

The STM32U385xx devices embed several protection mechanisms for embedded flash memory and SRAM: readout protection, write protection, secure proprietary code readout protection, secure, and hide protection areas.

These devices offer two 12-bit ADC (2.5 Msps), two comparators, two operational amplifiers, two DAC channels, an internal voltage reference buffer, a low-power RTC, three general-purpose 32-bit timer, one 16-bit PWM timer dedicated to motor control, three general-purpose 16-bit timers, two basic 16-bit timers and up to four 16-bit low-power timers.

The STM32U385xx devices embed a low-power digital filter dedicated to audio signals (ADF), with one filter supporting sound-activity detection. In addition, up to 21 capacitive sensing channels are available.

STM32U3 series also feature standard and advanced communication interfaces such as:

And several peripherals reinforcing security:

The STM32U385xx devices offer high protection against transient and environmental perturbation attacks thanks to several internal monitoring generating secret data erase in case of attack.

The devices operate in the -40 to +105 °C (+110 °C junction) temperature ranges from a 1.71 to 3.6 V power supply.

Some independent power supplies are supported like an analog independent supply input for ADC, DAC, OPAMPs and comparators, a 3.3 V dedicated supply input for USB and up to 14 I/Os, that can be supplied independently down to 1.08 V. A VBAT input is available for connecting a backup battery in order to preserve the RTC functionality and to backup 32 32‑bit registers.

The STM32U385xx devices offer 16 packages from 32-pin to 100-pin.

• Includes ST state-of-the-art patented technology.
• Ultra-low-power
  • 1.71 V to 3.6 V power supply
  • -40 °C to +105 °C temperature range
  • V_BAT mode: supply for RTC, 32 x 32-bit backup registers
  • 1.6 μA Stop 3 mode with 8-Kbyte SRAM
  • 2.2 μA Stop 3 mode with full SRAM
  • 3.8 μA Stop 2 mode with 8-Kbyte SRAM
  • 4.5 μA Stop 2 mode with full SRAM
  • 9.5 μA/MHz Run mode @ 3.3 V (While(1) SMPS step-down converter mode)
  • 13 μA/MHz Run mode @ 3.3 V/48 MHz (CoreMark^® SMPS step-down converter mode)
  • 16 μA/MHz Run mode @ 3.3 V/96 MHz (CoreMark^® SMPS step-down converter mode)
  • Brownout reset (BOR) in all modes except shutdown
• Arm^® 32-bit Cortex^®-M33 CPU with TrustZone^® and FPU
• ART Accelerator
  • 8-Kbyte instruction cache allowing 0-wait-state execution from flash and external memories: frequency up to 96 MHz, MPU, 144 DMIPS and DSP instructions
• Power management
  • Embedded regulator (LDO) and SMPS step-down converter supporting switch on-the-fly and voltage scaling
• Benchmarks
  • 1.5 DMIPS/MHz (Dhrystone 2.1)
  • 387 CoreMark^®(4.09 CoreMark^®/MHz)
  • 500 ULPMark™-CP
  • 117 ULPMark™-CM
  • 202000 SecureMark™-TLS
• Memories
  • 1-Mbyte flash memory with ECC, 2 banks read-while-write
  • 256 Kbytes of SRAM including 64 Kbytes with hardware parity check
  • OCTOSPI external memory interface supporting SRAM, PSRAM, NOR, NAND, and FRAM memories
• Security and cryptography
  • Arm^® TrustZone^® and securable I/Os, memories, and peripherals
  • Flexible life cycle scheme with RDP and password protected debug
  • Root of trust due to unique boot entry and secure hide protection area (HDP)
  • Secure firmware installation (SFI) from embedded root secure services (RSS)
  • Secure data storage with hardware unique key (HUK)
  • Secure firmware upgrade
  • Support of Trusted firmware for Cortex^®M (TF-M)
  • Two AES coprocessors, one with side channel attack resistance (SCA) (SAES)
  • Public key accelerator, SCA resistant
  • Key hardware protection
  • Attestation keys
  • HASH hardware accelerator
  • True random number generator, NIST SP800-90B compliant
  • 96-bit unique ID
  • 512-byte OTP (one-time programmable)
  • Antitamper protection
• Clock management
  • 4 to 50 MHz crystal oscillator
  • 32.768 kHz crystal oscillator for RTC (LSE)
  • Internal 16 MHz factory-trimmed RC (±1 %)
  • Internal low-power RC with frequency 32 kHz or 250 Hz (±5 %)
  • 2 internal multispeed 3 MHz to 96 MHz oscillators
  • Internal 48 MHz with clock recovery
  • Accurate MSI in PLL-mode and up to 96 MHz with 32.768 kHz, 16 MHz, or 32 MHz crystal oscillator
• General-purpose inputs/outputs
  • Up to 82 fast I/Os with interrupt capability most 5 V-tolerant and up to 14 I/Os with independent supply down to 1.08 V
• Up to 15 timers and 2 watchdogs
  • 1x 16-bit advanced motor‑control, 3x 32‑bit and 3x 16‑bit general purpose, 2x 16‑bit basic, 4x low‑power 16‑bit timers (available in Stop mode), 2x watchdogs, 2x SysTick timer
  • RTC with hardware calendar, alarms, and calibration
• Up to 19 communication peripherals
  • 1 USB 2.0 full-speed controller
  • 1 SAI (serial audio interface)
  • 3 I2C FM+(1 Mbit/s), SMBus/PMBus™
  • 2 I3C (SDR), with support of I2C FM+ mode
  • 2 USARTs and 2 UARTs (SPI, ISO 7816, LIN, IrDA, modem), 1 LPUART
  • 3 SPIs (6 SPIs including 1 with OCTOSPI + 2 with USART)
  • 1 CAN FD controller
  • 1 SDMMC interface
  • 1 audio digital filter with sound-activity detection
• 12-channel GPDMA controller, functional in Sleep and Stop modes (up to Stop 2)
• Up to 21 capacitive sensing channels
  • Support touch key, linear, and rotary touch sensors
• Rich analog peripherals (independent supply)
  • 2× 12-bit ADC 2.5 Msps, with hardware oversampling
  • 12-bit DAC module with 2 D/A converters, low-power sample and hold, autonomous in Stop 1 mode
  • 2 operational amplifiers with built-in PGA
  • 2 ultralow-power comparators
• CRC calculation unit
• Debug
  • Development support: serial-wire debug (SWD), JTAG, Embedded Trace Macrocell™ (ETM)
• All packages are ECOPACK2 compliant.