MG32F157 Datasheet: Memory, GPIO, ADC and Peripheral Overview

ElecSuppliers Part Number GuideAug 16, 2026

MG32F157 is a 32-bit Arm Cortex-M3 microcontroller designed for embedded control, industrial automation, communication, motor control, smart devices, and other applications that require integrated processing and peripheral functions. The MCU operates at up to 96 MHz and integrates 256 KB Flash memory and 64 KB SRAM.

For engineers researching the MG32F157 datasheet, the most important areas to review are memory capacity, GPIO resources, ADC and DAC functions, communication interfaces, timers, clock architecture, security features, and available packages.

MG32F157 Core and Operating Frequency

MG32F157 is based on an Arm 32-bit Cortex-M3 CPU with a maximum operating frequency of 96 MHz.

The MCU supports single-cycle multiplication and hardware division, providing the processing capability required for real-time embedded control and data processing applications.

The 96 MHz operating frequency makes MG32F157 suitable for applications where a conventional 32-bit MCU needs additional processing headroom without moving to a significantly more complex processor architecture.

The device also supports SWD and Trace interfaces for debugging and development.

MG32F157 Memory

Memory capacity is one of the first specifications engineers should check when selecting an MCU.

MG32F157 provides:

256 KB Flash memory

64 KB SRAM

The Flash memory supports zero wait-state operation from 0 to 48 MHz and one wait state above 48 MHz according to the product information.

The 64 KB SRAM provides working memory for program variables, buffers, communication data, control algorithms, and other runtime operations.

For an existing embedded design, engineers should compare the actual application memory usage with the available Flash and SRAM rather than evaluating the MCU only by CPU frequency.

MG32F157 GPIO

MG32F157 supports up to 80 fast I/O ports, depending on the specific package and device configuration.

The GPIO resources can be used for digital inputs and outputs, peripheral functions, external interrupts, control signals, and communication interfaces.

The device provides flexible GPIO mapping, with the product information indicating that the I/O ports can be mapped to 16 external interrupt vectors.

Most of the I/O ports are also compatible with 5V signals according to the manufacturer's product information.

For PCB design, engineers should still check the exact pin assignment and electrical specifications for the selected MG32F157 package.

MG32F157 ADC

MG32F157 integrates three 12-bit analog-to-digital converters.

The MCU provides up to 18 ADC channels, including channels associated with the internal temperature sensor and internal reference voltage.

These ADC resources allow the MCU to interface directly with analog signals used in embedded control and monitoring systems.

Typical applications include:

Motor current monitoring

Voltage measurement

Temperature monitoring

Sensor interfaces

Power management

Industrial control

Analog feedback systems

The exact ADC channel availability depends on the selected package and pin configuration, so the datasheet should be checked during schematic design.

MG32F157 DAC

In addition to ADC resources, MG32F157 integrates two 12-bit digital-to-analog converters.

The DAC peripherals can be useful when an embedded system needs to generate analog output signals without requiring an external DAC component.

Potential applications include analog control, waveform generation, reference voltage generation, and other mixed-signal embedded functions.

MG32F157 Communication Interfaces

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

The MCU supports up to 15 communication interfaces, including:

Up to 2 I2C interfaces

Up to 5 USART interfaces

3 SPI interfaces

1 QSPI interface

1 CAN interface

1 USB interface

1 SDIO interface

The USART peripherals support functions including ISO 7816, LIN, and IrDA. The maximum USART rate is specified as up to 4.5 Mbit/s, with additional functions such as modem control and low-power monitoring available on supported interfaces.

This combination gives developers considerable flexibility when designing communication-intensive embedded systems.

I2C and SPI Interfaces

I2C is commonly used to connect sensors, EEPROMs, displays, power-management ICs, and other peripheral devices.

MG32F157 provides up to two I2C interfaces, allowing multiple independent I2C buses to be implemented in an embedded system.

The MCU also provides three SPI interfaces and one QSPI interface.

These interfaces can be used for external Flash memory, displays, sensors, high-speed peripheral communication, and other embedded hardware.

CAN, USB and SDIO

MG32F157 integrates CAN, USB, and SDIO interfaces in addition to conventional serial communication peripherals.

The integrated CAN interface makes the MCU relevant to industrial control, vehicle-related electronics, motor-control equipment, and distributed control systems.

USB provides a convenient interface for connecting the MCU to computers and other USB-enabled equipment.

SDIO can be used for storage and other applications requiring an SD card interface.

Integrating these interfaces can reduce the number of external communication controllers required on the PCB.

MG32F157 Timer Resources

MG32F157 provides up to 11 timers.

The timer resources include:

4 general-purpose 32-bit timers

2 advanced 32-bit timers

2 independent watchdog timers

1 SysTick timer

2 basic 32-bit timers

These timer resources can support real-time control, PWM generation, periodic interrupts, motor-control functions, watchdog protection, and other timing-related tasks.

The availability of multiple timers is particularly useful in systems that need to manage several independent control processes simultaneously.

Clock and Reset Functions

MG32F157 supports several clock sources.

The device provides an external high-speed clock input from 4 MHz to 24 MHz, an internal 8 MHz high-speed clock, an external 32 kHz low-speed clock, and an internal 40 kHz low-speed clock.

The MCU also integrates power and reset management functions including Power-On Reset, Power-Down Reset, and a Programmable Voltage Detector.

These functions help the MCU manage startup, voltage monitoring, and system reset conditions.

Low-Power Modes

For battery-powered and energy-conscious applications, MG32F157 supports several low-power operating modes.

The available modes include:

Sleep

Stop

Standby

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

These features allow developers to design systems that reduce power consumption during inactive periods while retaining selected system functions.

MG32F157 Security Features

MG32F157 includes several hardware functions intended to support security and device identification.

The MCU integrates an AES hardware encryption unit and a true random number generator.

It also provides a 128-bit unique ID.

These features can be useful for embedded applications involving secure communication, device authentication, encrypted data processing, and product identification.

The MCU also includes a built-in ISP bootloader that supports program updates through USART.

This can simplify firmware update designs where products need to be programmed or upgraded through a serial interface.

MG32F157 Analog and Mixed-Signal Features

Beyond ADC and DAC peripherals, MG32F157 integrates three high-speed rail-to-rail operational amplifiers.

The combination of ADCs, DACs, operational amplifiers, internal voltage references, and temperature sensing functions makes the MCU suitable for embedded designs that combine digital processing with analog signal acquisition and control.

This can reduce the need for additional external analog components in some applications.

MG32F157 Operating Temperature

The MG32F157 product information specifies an operating temperature range of -40°C to +105°C.

This temperature range makes the MCU relevant to industrial and embedded applications that may operate outside typical consumer-electronics environments.

Engineers should still confirm the exact temperature specification for the selected part number and package before final product qualification.

MG32F157 Package Options

The MG32F157 family is offered in multiple package configurations.

The published datasheet includes:

LQFP100

LQFP64

LQFP48

QFN48

The number of available GPIOs and peripheral pins depends on the package.

For example, a larger package can provide access to more I/O resources, while a smaller package may be more suitable for space-constrained PCB designs.

When selecting an MG32F157 part number, engineers should therefore evaluate both the electrical requirements and the physical PCB requirements.

MG32F157 for Embedded Control

The combination of a 96 MHz Cortex-M3 core, 256 KB Flash, 64 KB SRAM, multiple timers, analog peripherals, communication interfaces, and security functions gives MG32F157 a broad range of possible embedded applications.

Potential applications include:

Industrial controllers

Motor control systems

Automation equipment

Communication devices

IoT products

Smart home equipment

Data acquisition systems

Embedded control boards

Power control equipment

Charging equipment

Sensor-based systems

The actual suitability depends on the memory requirements, peripheral configuration, operating environment, and software architecture of the target product.

MG32F157 for STM32F103 Replacement Projects

MG32F157 is also relevant to engineers evaluating alternatives to STM32F103-based designs.

Both devices use the Arm Cortex-M3 architecture, but MG32F157 provides a maximum frequency of 96 MHz together with 256 KB Flash and 64 KB SRAM.

For a replacement project, however, engineers should not assume software or hardware compatibility based only on the CPU architecture.

The PCB pin assignment, package, power supply, GPIO functions, peripheral registers, clock configuration, interrupt structure, development tools, firmware, and external interfaces should all be reviewed.

A successful MCU migration requires hardware verification and software adaptation based on the actual product design.

MG32F157 Datasheet Information for Engineers

When reviewing the MG32F157 datasheet, the most relevant specifications can be grouped into several areas.

The CPU section covers the 32-bit Cortex-M3 core and 96 MHz maximum frequency.

The memory section covers 256 KB Flash and 64 KB SRAM.

The GPIO section covers up to 80 fast I/O ports.

The analog section covers three 12-bit ADCs with up to 18 channels and two 12-bit DACs.

The communication section includes I2C, USART, SPI, QSPI, CAN, USB, and SDIO.

The timing section includes up to 11 timers.

The security section includes AES, TRNG, and a 128-bit unique ID.

The power section includes Sleep, Stop, Standby, and VBAT modes.

This structure makes it easier for engineers to identify the specifications that matter most for a particular embedded design.

MG32F157 MCU Overview

MG32F157 combines a 96 MHz Arm Cortex-M3 processor with substantial memory, flexible GPIO, analog peripherals, communication interfaces, timer resources, low-power modes, and hardware security functions.

Its 256 KB Flash, 64 KB SRAM, up to 80 I/O ports, 12-bit ADC and DAC resources, CAN, USB, SDIO, SPI, I2C, USART, QSPI, AES, TRNG, and integrated operational amplifiers make it a versatile MCU for embedded system development.

For engineers searching for MG32F157 datasheet information, the key evaluation areas are memory, GPIO, ADC, DAC, communication peripherals, timers, package options, power requirements, and operating conditions.

Before using the MCU in a production design, the exact MG32F157 part number and applicable datasheet should be reviewed to confirm package-specific pin functions and electrical specifications.