The NuMicro^® M5531 series stands as a powerful microcontroller (MCU), purpose-built to deliver lifted performance in digital signal processing. This strength is effectively enabled by its Arm^® Cortex^®-M55 processor, at speed of up to 220 MHz. Its operating voltage ranges from 1.71V to 3.6V while its operating temperature ranges from -40°C to +105°C.

Enhanced compute capability

This M5531 series incorporates up to 1.5 MB of SRAM and 2 MB of Flash Memory directly on the chip, along with SPIM interfaces for accommodating expanded RAM and ROM requirements. Its abundant compute resources, including DSP extensions, vector extensions (Helium), double-precision FPU, 2 sets of 16-channel PDMA controllers, 1 set of 2-channel GDMA(Graphic Direct Memory Access) controller, and ample SRAM and Flash Memories, make it ideal for compute-intensive embedded applications like real-time signal processing, high-performance control systems, sensor fusion, industrial automation, and communication systems.

Strengthened security measures

Security is another pivotal consideration for the M5531 series, featuring advanced security features such as secure boot, Arm TrustZone^®, true random number generator (TRNG), key derivation function (KDF), key store, AES/ECC/RSA/SHA/HMAC cryptography accelerators, and Arm PSA Certified^TM Level 2 compliance. These robust security measures significantly enhance the security and integrity of systems built with the M5531 series.

Abundant control functions

For analog and control functions, the M5531 series implements 2 sets of 12-bit SAR ADC, 2 sets of 12-bit 1 Msps DAC, 4 sets of analog comparators (ACMP), 1 set of built-in temperature sensor, 1 set of internal voltage reference generator, up to 24-channel PWM outputs, 4 sets of QEI, and 4 sets of input capture units.

Rich connectivity peripherals

The M5531 series also provides a wide array of communication and peripheral interfaces, including one set of Universal Serial Control Interface (USCI), which can be configured as UART/SPI/I²C with flexibility, 10 sets of UART, 4 sets of SPI/I²S, 4 sets of I²C, 1 set of I3C, 2 sets of CAN FD, 2 sets of QSPI, 2 sets of independent I²S, 1 set of USB 2.0 high-speed OTG/Host/Device with PD (Power Delivery) function and supporting USB Type-C connector, 1 set of USB 2.0 full-speed OTG/Host/Device, 1 set of 10/100 Ethernet MAC with RMII interface, 1 set of 8-bit parallel image sensor interface (CCAP), 1 set of 4-channel PDM microphone interface controller (DMIC), 3 sets of ISO-7816-3 smart card interfaces, and 2 sets of SDIO.

Table 1‑1 NuMicro M5531 Series Key Features Support Table

The M5531 series benefits design of a wide range of applications such as:

• IIOT
• Industrial Automation
• Human Machine Interface
• Communication Systems
• Sensor Fusion
• Smart Appliances

Key features:  

Operating Characteristics

• Voltage range: 1.71V to 3.6V
• Temperature range: -40°C to +105°C
• ESD HBM ±3 kV
• EFT ±4.4 kV
• Latch Up: ±200 mA

 Core

• Arm Cortex-M55 core, running up to 220 MHz
• Arm M-profile vector extension enabled (Helium)
• IEEE 754 compliant floating-point unit (FPU) supporting vector and scalar half-, single-, and double-precision floating-point calculations
• Arm TrustZone technology including an 8-region secure memory protection unit and an 8-region non-secure memory protection unit
• Arm custom instructions (ACI) implemented for accelerating specific math operations
• L1 cache: 16 KB instruction cache (I-cache) and 16 KB data cache (D-cache)

Memories

• Secure Boot ROM (MaskROM): 24 KB
• APROM Flash: 2 MB (dual banks of 1MB each)
• LDROM Flash: 8 KB
• OTP Flash: 3 KB
• XOM (Execution-only memory): 4 regions
• SRAM0: 512 KB
• SRAM1: 512 KB
• SRAM2: 320 KB
• SRAM3: 8 KB
• LPSRAM: 8 KB
• I-TCM(Tightly Coupled Memory) : 64 KB
• D-TCM(Tightly Coupled Memory) : 128 KB

External Memory Interface

• SPIM (with HyperBus interface) supporting SPI Flash, QSPI, OSPI, and HyperFlash memories up to 32 MB, featuring AES on-the-fly decryption
• External bus interface (EBI) supporting 8- or 16-bit data width, i80 mode LCD interface, and up to three sets of 1 MB memory banks

Clocks

• 4~32 MHz high-speed external crystal oscillator
• 32.768 kHz low-speed external crystal oscillator
• 48 MHz high-speed internal RC oscillator
• 12 MHz high-speed internal RC oscillator with 2% deviation
• 1~8 MHz high-speed internal RC oscillator
• 32 kHz low-speed internal RC oscillator
• 2 sets of programmable APLL, up to 480 MHz

Direct Memory Access (DMA)

• 2 sets of 16-channel PDMA controllers
• 1 set of 2-channel GDMA(Graphic Direct Memory Access) controller (DMA-350)
• 1 set of 4-channel LPPDMA controller

Security Functions

• Secure Boot
• Key derivation function (KDF)
• Cryptography accelerator including algorithms up to AES-256, ECC-571, SHA-512, HMAC-512, RSA-4096, and a pseudo random number generator (PRNG)
• True random number generator (TRNG)
• Key store module for key management, including a dedicated Key store SRAM buffer
• Four eXecute-Only-Memory (XOM) regions for code protection
• Write protection in Flash memory

Power Management

• Active power: 94.5 μA/MHz at 220MHz
• Normal power-down (NPD4) with 64 KB SRAM retention: 12.5 μA at 3.0V
• Standby power-down (SPD1) with 64 KB SRAM retention: 6.1 μA at 3.0V (SRAM retention up to 64/128/192/256/320/384/448/512 KB)
• Deep power-down (RTC on): 0.64 μA at 3.0V (LIRC)
• RTC (V_BAT): 0.36 μA
• Power-on reset
• Brown-out reset
• Low voltage reset
• Built-in LDO voltage regulators

Timer and Control Peripheral

• 4 sets of 32-bit timers, supporting PWM function
• 2 sets of 32-bit low power timers, supporting PWM function
• 2 sets of tick timers
• 1 set of 24-bit count-down SysTick timer
• 2 sets of watchdog timers
• 2 sets of window watchdog timers
• Up to 12 enhanced PWM (EPWM) outputs generated by twelve 16-bit counters
• Up to 12 basic PWM (BPWM) outputs generated by two 16-bit counters
• Up to 4 sets of enhanced quadrature encoder interfaces (EQEI)
• Up to 4 sets of enhanced input capture unit (ECAP)

Connectivity Interfaces

• Up to 10 sets of UART interfaces
• Up to 1 set of LPUART interface
• Up to 4 sets of I²C interfaces, up to 1 Mbps
• Up to 1 set of LPI2C interface, up to 1 Mbps
• Up to 1 set of I3C interface, up to 25 Mbps
• Up to 4 sets of SPI/I²S interfaces
• Up to 1 set of LPSPI interface
• Up to 2 sets of Quad-SPI interfaces
• Up to 1 set of USCI, supporting UART/I²C/SPI
• Up to 2 sets of SDIO interfaces
• Up to 3 sets of ISO-7816-3 smart card interfaces, supporting UART
• Up to 2 sets of I²S interfaces
• Up to 1 set of 8-ch programmable serial I/O (PSIO) interface
• DMIC (Digital microphone inputs), supporting 4-channel PDM interface and voice activity detection (VAD)
• 6x8 Keypad Interface (KPI)

Advanced Connectivity

• Up to 2 sets of CAN FD interfaces
• USB 2.0 high speed device/host/OTG controller with dedicated DMA and on-chip PHY, supporting power delivery (PD) function
• USB 2.0 full speed device/host/OTG controller with on-chip PHY, supporting crystal-less at device mode
• 10/100 Ethernet MAC with RMII interface, supporting IEEE 1588 v2 precision time protocol

Low Power Peripherals

• LPSRAM: 8 KB
• Up to 1 set of LPUART interface
• Up to 1 set of LPI²C interface, up to 1 Mbps
• Up to 1 set of LPSPI interface
• 1 set of 4-channel LPPDMA controller
• 2 sets of 32-bit low power timers, supporting PWM function
• 1 set of 12-bit, up to 24-ch, 2 Msps SAR LPADC

Camera Capture Interface Controller (CCAP)

• Resolution up to 640x480 pixels
• Supports motion detection engine with 320x240 image data in Power-down mode

Analog Peripherals

• 1 set of 12-bit, up to 24-channel, 5 Msps SAR ADC
• 1 set of 12-bit, up to 24-channel, 2 Msps SAR LPADC
• Up to 2 sets of 12-bit, 1 Msps buffered DAC
• Up to 4 sets of analog comparators (ACMP)
• Built-in internal reference voltage
• Built-in temperature sensor

Cyclic Redundancy Calculation (CRC)

Real Time Clock (RTC), Tamper and V_BAT Power Domain

• Supports independent V_BAT power pin for RTC and tamper detection
• Supports calendar RTC
• Backup registers: 80 bytes
• Tamper detection: 6 pins

I/O Features

• Up to 142 GPIO with interrupt capability
• GPIO with internal pull-up / pull-down resistor

96-bit Unique ID (UID)

128-bit Unique Customer ID (UCID)

Package

 -Package is Halogen-free, RoHS-compliant and TSCA-compliant.  

Development Environment:

Evaluation Board: