GENERAL DESCRIPTION

The NuMicro® M2354 Series is a TrustZone® for Armv8-M architecture empowered microcontroller series focusing on IoT Security based on Arm® Cortex®-M23 CPU core technology. It runs up to 96 MHz with 1024 Kbytes embedded Flash memory and 256 Kbytes SRAM, supporting Flash in dual-bank mode, secure firmware OTA (Over-The-Air) update, ultra-low power consumption in normal run with 89.3 uA/MHz in LDO mode, 39.6 uA/MHz in DC-DC mode and an 8x40 COM/SEG LCD driver inside. Besides the fundamental microcontroller security features, it further enhances the chip-level security in covering side-channel attacks mitigation to crypto hardware engine, fault injection mitigation for operating voltage and clock as well as active shield to cryptographic key storage. The series supports power supply voltage from 1.7V ~ 3.6V in operating temperature range from -40°C to +105°C, and is equipped with both LDO and DC-DC power supply functionalities. The M2354 Series is quite competitive for those devices that need more secure, fast computing and low power in the IoT market.

The one of major challenges for IoT devices that are connected to cloud services or other devices by network communication is security, so the IoT devices must meet some security requirements to protect firmware, software and secure assets from being stolen or modified by an attacker. “Execution”, “Storage”, and “Connectivity” are the three important security targets for IoT devices.

The TrustZone® technology based on Armv8-M architecture is a System-on-Chip (SoC) and CPU system-wide approach to microcontroller security. The whole system isolates secure and normal worlds to avoid the trusted assets being accessed by a non-secure process. In addition to the firmware-level security, the M2354 series is also equipped with rich functions to improve system security. The Secure Bootloader supports trusted system-boot feature which can protect certificated firmware from being replaced with malware possibly in the upgrade processing and taking control of system resource finally. The hardware crypto accelerators, including AES, ECC and RSA, support encryption and decryption operations to offload the main processor‟s computing power and ensure data transmission in secure.

The M2354 series also enhances firmware update security requirement with monotonic version counter. The firmware cannot be rollback to older one which has lower security protection. Furthermore, there is a secure crypto keys storage protected by the chip-level active shield function to physical intrusion. The series addresses the physical attack protection and system security certification for Arm® PSA CertifiedTM Level 2 even for PSA CertifiedTM Level 3.

Other than security, low power is also vital for IoT applications. The M2354 series supports 4 core power levels with both LDO and DC-DC power supply mechanism. Except normal run mode, the series also provides idle run mode with power consumption 31.5 μA/MHz in LDO mode and 14.3 μA/MHz in DC-DC mode. The current consumption of Deep Power-Down mode without VBAT is less than 0.1 μA.

The M2354 series is equipped with plenty of peripherals such as Timers, Watchdog Timers, RTC, PDMA, UART, Universal Serial Control Interface (USCI), SPI/ I²S, I2C, GPIOs, makes it highly suitable for connecting comprehensive external modules. The M2354 integrates high performance analog front-end circuit blocks, such as 16 channels of 12-bit 6 MSPS ADC, temperature sensor, low voltage reset (LVR) and brown-out detector (BOD) to enhance product performance, reduce external components and form factor simultaneously. Moreover, it supports up to 8x40 COM/SEG for segment LCD display needed such as metering devices.

FEATURES

Arm® Cortex®-M23

 Arm® Cortex®-M23 processor, running up to 96 MHz

 96 MHz at 1.8V-3.63V; 84 MHz at 1.7V

 Supports Arm® TrustZone® Technology

 Built-in PMSAv8 Memory Protection Unit (MPU)

 Built-in Security Attribution Unit (SAU)

 Built-in Nested Vectored Interrupt Controller (NVIC)

 Built-in Embedded Trace Macrocell (ETM)

 32-bit Single-cycle hardware multiplier and 32-bit 17-cycle hardware divider

 24-bit system tick timer

 Supports Programmable and maskable interrupt

 Supports Low Power Sleep mode by WFI and WFE instructions

 Supports single cycle I/O access

Secure Configuration Unit (SCU)

 Configure SRAM‟s security and privilege attribution block by block

 Configure GPIOs‟ security and privilege attribution port by port

 Configure peripherals‟ security and privilege attribution

 Generates secure and privilege violation interrupt

 Equipped with a 24-bit timer as a non-secure state monitor

 Monotonic firmware version counter

 Debug protection mechanism

 Product life-cycle management

Brown-out Detector (BOD)

 Eight-level BOD with brown-out interrupt and reset option (3.0V/2.8V/2.6V/2.4V/2.2V/2.0V/1.8V/1.6V)

Low Voltage Reset (LVR)

LVR with 1.5V threshold voltage level

Power Manager

 Dual voltage regulator is available for DC-DC converter or LDO

 Supports 1.26V, 1.2V, 1.1V and 0.9V core voltage while operating

 Supports Power-down mode

 Supports Standby Power -down mode

 Supports Low Leakage Power-down mode

 Supports Ultra-low Leakage Power-down mode

 Supports Fast Wake-up Power-down mode

 Supports Deep Power-down mode

Security

 128-bit Unique ID (UID)

 128-bit Unique Customer ID (UCID)

 One built-in temperature sensor with 1°C resolution