MG32F157 MCU: 96MHz ARM Cortex-M3 Microcontroller with 256KB Flash and 64KB SRAM

ElecSuppliers Part Number GuideAug 16, 2026

MG32F157 is a 32-bit ARM Cortex-M3 microcontroller designed for embedded control, industrial equipment, communication systems, motor control, smart devices, and other applications that require integrated processing and peripheral resources.

The MCU operates at a maximum frequency of 96MHz and integrates up to 256KB Flash memory and 64KB SRAM. Its peripheral architecture includes multiple communication interfaces, analog functions, timers, GPIO, security functions, and low-power operating modes.

With its combination of processing performance, memory capacity, communication interfaces, analog peripherals, and security features, MG32F157 can be considered for both new embedded designs and MCU replacement projects.

96MHz ARM Cortex-M3 Core

MG32F157 uses an ARM 32-bit Cortex-M3 CPU with a maximum operating frequency of 96MHz.

The Cortex-M3 architecture is widely used in embedded control applications where deterministic processing, interrupt handling, peripheral control, and real-time operation are important.

The MCU also supports single-cycle multiplication and hardware division, providing dedicated arithmetic capabilities for embedded applications.

At frequencies from 0 to 48MHz, the Flash memory operates with 0 wait states. Above 48MHz, one wait state is required.

This memory architecture allows engineers to take advantage of the MCU's higher clock frequency while designing applications that require faster control and data processing.

256KB Flash and 64KB SRAM

Memory capacity is an important factor when selecting an embedded MCU.

MG32F157 provides up to 256KB of Flash memory and 64KB of SRAM.

The Flash can store application firmware, communication protocols, control algorithms, bootloader functions, and other embedded software.

The 64KB SRAM provides working memory for variables, buffers, communication data, control algorithms, and real-time application processing.

This memory configuration makes MG32F157 suitable for embedded products that require more software and data space than entry-level microcontrollers.

MG32F157 ADC and DAC Resources

MG32F157 integrates multiple analog resources for embedded systems that need to interact with sensors, power circuits, control signals, and other analog devices.

The MCU provides three 12-bit ADC units with up to 18 channels.

The ADC resources also include an integrated temperature sensor and internal reference voltage channels.

For analog output applications, MG32F157 provides two 12-bit DAC units.

This combination of ADC and DAC resources can reduce the need for additional external analog components in certain system designs.

Potential applications include sensor acquisition, motor control, power management, industrial monitoring, measurement equipment, and intelligent control systems.

Up to 80 Fast I/O Ports

MG32F157 provides up to 80 fast I/O ports depending on the selected device and package.

The I/O architecture is designed to provide flexible connections between the MCU and external hardware.

The official specifications also indicate that the I/O ports can be mapped to 16 external interrupt vectors, while most I/O pins are compatible with 5V signals.

This can be useful for embedded products that require multiple digital inputs and outputs or need to interface with existing control circuitry.

When designing a PCB, engineers should still check the exact pin assignment for the selected MG32F157 package because available I/O and alternate functions can vary between package options.

Multiple Communication Interfaces

One of the notable characteristics of MG32F157 is its large number of integrated communication peripherals.

The MCU supports up to 15 communication interfaces across several peripheral types.

The communication resources include up to two I2C interfaces, up to five USART interfaces, three SPI interfaces, one QSPI interface, one CAN interface, one USB interface, and one SDIO interface.

The USART peripherals support functions including ISO 7816, LIN, and IrDA, with a maximum specified rate of 4.5Mbit/s. One USART also supports modem control and low-power monitoring functions that can wake the MCU.

This combination gives engineers considerable flexibility when designing communication-heavy embedded products.

CAN and USB Support

CAN is important for many industrial and automotive-related embedded control systems.

MG32F157 integrates one CAN interface, allowing the MCU to communicate with other controllers and devices over a CAN network.

The integrated USB interface also makes the MCU suitable for products requiring USB connectivity.

Potential applications include industrial controllers, diagnostic equipment, embedded terminals, communication devices, data acquisition systems, and USB-enabled control products.

SPI QSPI and SDIO Interfaces

In addition to conventional serial communication interfaces, MG32F157 integrates three SPI interfaces and one QSPI interface.

QSPI can be useful when higher-speed serial memory or peripheral communication is required.

The MCU also includes an SDIO interface, providing another option for storage-related or high-speed data applications.

Having multiple serial interfaces allows engineers to connect sensors, displays, external memory, communication modules, storage devices, and other peripherals within the same embedded system.

Up to 11 Timers

Timing and control functions are important for embedded systems.

MG32F157 integrates up to 11 timer resources, including four 32-bit general-purpose timers, two 32-bit advanced timers, two independent watchdog timers, one SysTick timer, and two 32-bit basic timers.

These timer resources can support functions such as PWM generation, periodic interrupts, event timing, motor control, pulse measurement, watchdog protection, and real-time control.

The number of available timer resources makes the MCU suitable for applications where multiple independent timing functions are required.

AES and TRNG Security Functions

Embedded security is increasingly important for connected and industrial products.

MG32F157 integrates an Advanced Encryption Standard hardware function and a true random number generator.

The AES hardware can be used as part of an application's encryption architecture, while the TRNG provides true random number generation for security-related functions.

The MCU also includes a 128-bit unique ID.

These features can be useful for applications requiring device identification, secure communication, encryption, authentication, or unique device provisioning.

Built-In ISP Bootloader

MG32F157 includes an integrated ISP Bootloader that supports firmware programming and upgrades through USART.

This feature can be useful during manufacturing and product maintenance because firmware updates can be performed through a serial communication interface.

For products deployed in the field, an appropriate firmware update architecture can reduce the need for physical MCU replacement or direct programming during certain maintenance procedures.

The exact bootloader implementation and update procedure should be designed according to the selected device and application requirements.

Three High-Speed Rail-to-Rail Operational Amplifiers

MG32F157 integrates three high-speed rail-to-rail operational amplifiers.

This is an important feature for applications that require analog signal conditioning.

Integrated operational amplifiers can be used in signal amplification, sensor interfaces, analog control loops, measurement systems, and other circuits where analog signal processing is required.

Combining ADC, DAC, temperature sensing, reference functions, and integrated operational amplifiers gives MG32F157 a broader analog peripheral set than a basic digital-control MCU.

Low-Power Operating Modes

MG32F157 supports Sleep, Stop, and Standby modes for applications where power consumption needs to be controlled.

The MCU also provides a VBAT power supply mode for RTC and backup register functions.

These features allow engineers to develop different power-management strategies depending on whether the application prioritizes active performance, standby consumption, or battery-backed timekeeping.

MG32F157 can therefore be considered for both continuously powered equipment and embedded products that require low-power operating modes.

Clock System

MG32F157 provides multiple clock sources.

The high-speed clock system supports an external 4MHz to 24MHz clock and an internal 8MHz high-speed clock.

For low-speed operation, the MCU provides an external 32kHz clock and an internal 40kHz low-speed clock.

The availability of internal and external clock sources gives engineers flexibility when designing system timing and low-power operating modes.

Industrial Operating Temperature

MG32F157 is specified for an operating temperature range of -40°C to +105°C.

This temperature range makes the MCU relevant to industrial embedded applications where equipment may operate outside typical consumer-electronics temperature conditions.

Engineers should still evaluate the complete thermal design, power dissipation, PCB layout, enclosure conditions, and application-specific reliability requirements before production.

MG32F157 Package Options

MG32F157 is available in multiple package configurations.

The current Datasheet documentation includes:

LQFP100

LQFP64

LQFP48

Package selection affects the available I/O resources, pin functions, PCB layout, and mechanical design.

For an existing product, engineers should identify the exact MG32F157 package before starting PCB migration.

The package number alone should not be treated as evidence of pin-to-pin compatibility with another MCU. The complete pin map and alternate-function configuration should always be checked.

MG32F157 for STM32F103 Replacement

MG32F157 is also relevant to engineers researching an STM32F103 replacement or alternative Cortex-M3 MCU.

Both use the ARM Cortex-M3 architecture, which can make the migration conceptually familiar to embedded developers.

However, an STM32F103 replacement should be evaluated according to the exact STM32F103 part number rather than only the family name.

Engineers should compare:

The package

Pin assignment

Flash memory

SRAM

GPIO

ADC

DAC

Timers

USART

SPI

I2C

CAN

USB

Clock configuration

Power requirements

Interrupt architecture

Development environment

Firmware dependencies

An existing STM32F103 application may require changes to startup code, peripheral drivers, clock configuration, interrupt handling, and MCU-specific software.

MG32F157 should therefore be considered as an MCU alternative requiring technical validation rather than automatically assumed to be a drop-in replacement.

MG32F157 Applications

The combination of a 96MHz Cortex-M3 core, integrated analog peripherals, multiple communication interfaces, timers, security functions, and flexible I/O makes MG32F157 suitable for many embedded applications.

Industrial Automation

MG32F157 can be used in industrial controllers, monitoring equipment, automation systems, sensor interfaces, and embedded control boards.

CAN, USART, SPI, I2C, ADC, timers, and GPIO resources provide the peripheral functions required by many industrial control architectures.

Motor Control

The MCU's advanced timers, ADC resources, DAC, operational amplifiers, GPIO, and communication interfaces can support motor-control system architectures.

Applications may include motor controllers, automation equipment, pumps, fans, actuators, and intelligent drive systems.

IoT and Smart Devices

MG32F157 combines multiple communication interfaces with low-power modes and hardware security functions.

This makes it suitable for connected embedded products, smart controllers, gateways, monitoring devices, and intelligent terminals.

Data Acquisition

The combination of multiple ADC channels, DAC, operational amplifiers, memory, and communication interfaces makes MG32F157 suitable for sensor acquisition and measurement equipment.

Embedded Control

The Cortex-M3 core, timers, GPIO, communication peripherals, and integrated memory provide a platform for general-purpose embedded control systems.

MG32F157 Datasheet and Development Resources

For engineers evaluating MG32F157, the datasheet is an important starting point because the device has multiple package and peripheral configurations.

The available development resources include an MG32F157 user guide, sample code, development tools, and development kits.

The current English Datasheet listed for MG32F157 is version 1.0.5, while the MG32F157 user guide is listed separately as a technical resource.

Development support includes OCDM3 MLink, WriterM3, and U1Plus tools.

These resources can help engineers move from initial MCU evaluation to firmware development and hardware testing.

MG32F157 MCU Selection Guide

When selecting MG32F157 for a new product, engineers should start with the application's actual requirements.

A higher clock frequency is useful when additional processing performance is required, while 256KB Flash and 64KB SRAM provide space for relatively complex embedded firmware.

Applications requiring multiple communication channels can take advantage of the MCU's USART, SPI, I2C, QSPI, CAN, USB, and SDIO resources.

Systems requiring analog processing can use the integrated ADC, DAC, temperature sensor, reference functions, and operational amplifiers.

Products requiring embedded security can evaluate AES, TRNG, and the 128-bit unique ID.

For industrial equipment, the -40°C to +105°C operating temperature range is another important selection factor.

MG32F157 for Embedded Product Development

MG32F157 combines the core functions normally required by a modern embedded controller into a single MCU platform.

Its 96MHz Cortex-M3 processor provides the computing core, while 256KB Flash and 64KB SRAM provide program and working memory.

The MCU further integrates multiple communication interfaces, analog peripherals, timers, security functions, low-power modes, USB, CAN, and SDIO.

This combination makes MG32F157 suitable for engineers developing industrial control boards, motor-control systems, communication equipment, IoT products, data acquisition systems, and other embedded electronic products.

For replacement projects, the exact device and package should be matched against the original MCU before PCB and firmware migration. For new designs, the complete peripheral and memory requirements should be evaluated first so that the appropriate MG32F157 variant can be selected.