STM32U385RGT6Q

Product Overview

The STM32U385RGT6Q is an ultra-low-power 32-bit microcontroller from STMicroelectronics based on the Arm Cortex-M33 processor, operating at up to 96 MHz. It integrates 1MB of Flash memory, 256KB of SRAM, a floating-point unit (FPU), TrustZone security technology and an internal SMPS step-down converter.

Part of the STM32U3 series, the STM32U385RGT6Q combines energy-efficient processing with advanced analog peripherals, high-speed communication interfaces, external memory connectivity and hardware security features. Its integrated ADCs, DACs, operational amplifiers, comparators, timers and digital audio filtering resources make it suitable for industrial control, smart sensing, measurement equipment, battery-powered products and connected embedded systems.

The exact STM32U385RGT6Q uses an LQFP-64 package measuring 10 × 10 × 1.4 mm. It operates from 1.71V to 3.6V and has a specified operating temperature range of -40°C to +85°C. The Q suffix identifies the internal SMPS variant. STMicroelectronics lists this part as active and in volume production.

Key Features

• 32-bit Arm Cortex-M33 processor

• CPU frequency up to 96 MHz

• Arm TrustZone security technology

• Single-precision floating-point unit (FPU)

• Digital signal processing (DSP) instructions

• Memory Protection Unit (MPU)

• 1MB embedded Flash memory with ECC

• Dual-bank Flash supporting read-while-write

• 256KB SRAM, including 64KB with hardware parity checking

• 8KB instruction cache

• Integrated SMPS step-down converter

• Two 12-bit ADCs with up to 2.5 MSPS performance

• Two 12-bit DAC output channels

• Two operational amplifiers

• Two comparators

• Three general-purpose 32-bit timers

• One 16-bit motor-control PWM timer

• Three general-purpose 16-bit timers

• Two basic 16-bit timers

• Up to four 16-bit low-power timers

• Three I²C interfaces

• Two I3C interfaces

• Three SPI interfaces

• Octo-SPI external memory interface

• One FDCAN interface

• Hardware cryptographic accelerators

• True random number generator

• Digital audio filter with sound-activity detection support

• Up to 21 capacitive-sensing channels

• 96-bit unique device ID

• Supply voltage from 1.71V to 3.6V

• Operating temperature from -40°C to +85°C for this ordering variant

• LQFP-64 package

• ECOPACK2 compliant

These features are based on the official STM32U385 series documentation. Refer to the exact datasheet for peripheral availability, pin multiplexing and electrical limits.

Technical Specifications

The official ST online store identifies STM32U385RGT6Q as an active industrial-grade device with internal SMPS, LQFP-64 packaging and tray packing.

Processor & Architecture

The STM32U385RGT6Q integrates a 32-bit Arm Cortex-M33 processor operating at up to 96 MHz. The processor includes a single-precision FPU, DSP instructions and a Memory Protection Unit to support signal processing, mathematical computation and memory-access control.

Arm TrustZone technology enables secure and non-secure execution environments, helping developers isolate sensitive firmware and data. An 8KB instruction cache supports efficient instruction execution from embedded Flash and external memories.

The STM32U3 architecture uses near-threshold voltage technology to improve energy efficiency, making the device suitable for applications requiring a balance between processing performance and battery life.

Memory & Storage

The STM32U385RGT6Q provides integrated memory resources for firmware, application data and secure embedded software.

• 1MB embedded Flash memory with ECC

• Dual-bank Flash architecture

• Read-while-write support

• 256KB SRAM

• 64KB SRAM with hardware parity checking

• 8KB instruction cache

• 512-byte one-time-programmable memory

• Octo-SPI external memory interface

• Support for compatible external SRAM, PSRAM, NOR Flash, NAND Flash and FRAM devices

The dual-bank Flash architecture supports firmware-management strategies that require separate memory banks. ECC and parity-checking resources help detect certain memory errors, while the Octo-SPI interface provides additional storage options for applications requiring external memory.

Analog Peripherals

The STM32U385RGT6Q integrates analog resources for measurement, sensor acquisition, signal conditioning and embedded control.

• Two 12-bit ADCs

• ADC performance up to 2.5 MSPS under specified conditions

• Two 12-bit DAC output channels

• Two operational amplifiers

• Two comparators

• Internal voltage-reference buffer

• Capacitive-sensing support

• Digital temperature-sensing capability

These peripherals support sensor interfaces, voltage and current measurement, analog signal conditioning, control loops and human-machine interfaces. Actual conversion accuracy and channel availability depend on operating conditions and pin configuration.

Timer & PWM Resources

The STM32U385RGT6Q provides timer resources for precise timing, waveform generation and real-time control.

• Three general-purpose 32-bit timers

• One 16-bit motor-control PWM timer

• Three general-purpose 16-bit timers

• Two basic 16-bit timers

• Up to four 16-bit low-power timers

• PWM generation on supported timer channels

• Input capture and output compare on supported timers

• Real-time clock with alarm and wake-up functions

• Independent watchdog

• Window watchdog

• SysTick timer

These timer resources support motor and actuator control, pulse measurement, event timing, periodic scheduling and low-power wake-up functions. Consult the reference manual for exact channel assignments and timer interconnections.

Communication & Connectivity

The STM32U385RGT6Q integrates a broad range of communication interfaces for connecting sensors, external controllers, memory devices and industrial equipment.

• Three I²C interfaces

• Two I3C interfaces

• Three SPI interfaces

• One Octo-SPI external memory interface

• One FDCAN interface

• USART and UART communication resources

• Serial Wire Debug (SWD)

• GPIO-based communication options

The I3C interfaces support modern sensor connectivity, while SPI, I²C and USART interfaces accommodate a wide range of peripherals. FDCAN supports communication in compatible automotive and industrial control networks. Interface availability depends on pin multiplexing and peripheral configuration.

Clock & Power Management

The STM32U385RGT6Q includes flexible clock-generation and power-management resources.

• Internal multispeed oscillators

• Internal 16 MHz RC oscillator

• Internal 48 MHz clock source with clock recovery

• Internal low-speed oscillator

• External high-speed crystal oscillator support

• External 32.768 kHz low-speed crystal oscillator support

• Phase-locked loop (PLL) clock generation

• Integrated LDO regulator

• Internal SMPS step-down converter

• Voltage scaling

• Power-on and power-down reset

• Brownout reset

• VBAT supply for RTC and backup registers

These resources allow developers to balance clock accuracy, processing performance and power consumption according to application requirements.

Low-Power Operation

The STM32U385RGT6Q is designed for energy-efficient embedded systems that may spend extended periods in standby or sleep states.

• Sleep mode

• Multiple Stop modes

• Shutdown mode

• Low-power RTC operation

• Peripheral clock management

• SRAM retention options in supported modes

• Wake-up support from selected peripherals and events

• Integrated SMPS for efficient power conversion

These capabilities make the device suitable for battery-powered instruments, portable electronics, smart sensors and industrial monitoring products. Actual power consumption depends on clock settings, peripheral activity, memory retention and operating conditions.

Power Management

The STM32U385RGT6Q operates from a supply voltage of 1.71V to 3.6V and integrates an SMPS step-down converter.

• Supply voltage: 1.71V to 3.6V

• Integrated SMPS step-down converter

• Embedded LDO regulator

• Dynamic voltage-scaling support

• Power-on and power-down reset

• Brownout reset

• Peripheral clock gating

• Multiple low-power operating modes

• VBAT supply for RTC and backup functions

The internal SMPS helps improve power efficiency in supported configurations. Power-supply design, external components and PCB layout should follow STMicroelectronics' recommendations in the datasheet and hardware design documentation.

Security & Data Integrity

The STM32U385RGT6Q integrates hardware and architectural features to support secure firmware execution and data integrity.

• Arm TrustZone security architecture

• Secure and non-secure execution environments

• Secure memory and peripheral access controls

• Flash ECC

• Hardware parity checking for the specified SRAM region

• Hardware AES cryptographic accelerators

• Side-channel-resistant secure AES accelerator

• Public-key cryptographic accelerator

• Hardware hash accelerator

• True random number generator

• Hardware unique key support

• Secure firmware installation and upgrade resources

• Readout protection and secure hide-protection areas

• 96-bit unique device ID

• Antitamper protection

These features help developers implement secure boot, protected data storage, firmware authentication and secure embedded communications. The exact security configuration depends on the device lifecycle and firmware design.

Development & Debugging

The STM32U385RGT6Q is supported by the STM32 development ecosystem, including software configuration tools, firmware libraries and debugging hardware.

Development resources include:

• STM32CubeIDE

• STM32CubeMX

• STM32CubeU3 software package, where available

• ST-LINK programming and debugging tools

• Serial Wire Debug (SWD)

• Official datasheets and reference manuals

• Application notes and firmware examples

These resources help engineers configure peripherals, implement low-power firmware, integrate security features and develop applications using the STM32U3 platform.

Applications

The STM32U385RGT6Q is suitable for applications such as:

• Industrial automation

• Smart sensors

• Battery-powered instruments

• Portable measurement equipment

• Energy monitoring

• Smart meters

• Motor and actuator control

• Industrial communication

• Secure embedded systems

• Audio activity detection

• Capacitive-touch interfaces

• Consumer electronics

• Building automation

• Low-power IoT devices

• General-purpose embedded control

Benefits

• 96 MHz Arm Cortex-M33 processing performance

• 1MB Flash memory with ECC

• 256KB SRAM

• TrustZone security architecture

• Single-precision floating-point processing

• Integrated SMPS for improved power efficiency

• Dual 12-bit ADCs and two DAC channels

• Integrated operational amplifiers and comparators

• Three I²C and two I3C interfaces

• Three SPI interfaces

• FDCAN connectivity

• Octo-SPI external memory expansion

• Advanced timer and PWM resources

• Hardware cryptographic accelerators

• Multiple low-power modes

• LQFP-64 package

• Industrial-grade environmental compliance

• Established STM32 development ecosystem

Packaging & Ordering Information

• Part Number: STM32U385RGT6Q

• Manufacturer: STMicroelectronics

• Device Family: STM32U385RG

• Package: LQFP-64

• Package Code: LQFP64

• Package Size: 10 × 10 × 1.4 mm

• Packing Type: Tray

• Supply Voltage: 1.71V to 3.6V

• Operating Temperature: -40°C to +85°C

• Product Status: Active

• Grade: Industrial

• RoHS: ECOPACK2

The exact STM32U385RGT6Q is an active, industrial-grade LQFP-64 device with an internal SMPS converter. The related STM32U385RGT6 and STM32U385RGT6TR are distinct ordering variants and should not be substituted for the requested part number.

Datasheet

For complete electrical characteristics, pin configuration, memory architecture, ADC specifications, timer configuration, communication interfaces, absolute maximum ratings, and application information, please refer to the official STMicroelectronics documentation.

Datasheet: Official STM32U385RG Datasheet

Frequently Asked Questions

What is the STM32U385RGT6Q?

The STM32U385RGT6Q is an ultra-low-power 32-bit Arm Cortex-M33 microcontroller from STMicroelectronics with a 96 MHz CPU, 1MB Flash, 256KB SRAM and an integrated SMPS converter.

What is the maximum CPU frequency?

The maximum CPU frequency is 96 MHz.

How much Flash memory does the STM32U385RGT6Q have?

It provides 1MB of embedded Flash memory with ECC and a dual-bank architecture.

How much SRAM does the STM32U385RGT6Q have?

It provides 256KB of SRAM, including a 64KB region with hardware parity checking.

Does the STM32U385RGT6Q support TrustZone?

Yes. It integrates Arm TrustZone technology to support secure and non-secure execution environments.

What analog peripherals does it include?

It includes two 12-bit ADCs, two 12-bit DAC output channels, two operational amplifiers and two comparators.

Does the STM32U385RGT6Q have an internal SMPS?

Yes. The Q suffix identifies the variant with an internal SMPS step-down converter.

What package does the STM32U385RGT6Q use?

The exact part uses an LQFP-64 package measuring 10 × 10 × 1.4 mm.

What is its operating voltage?

The specified supply-voltage range is 1.71V to 3.6V.

What is its operating temperature range?

The exact STM32U385RGT6Q is specified for operation from -40°C to +85°C.

Is the STM32U385RGT6Q an active product?

Yes. STMicroelectronics lists the exact ordering variant as active and in volume production.

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