What is RTU?

RTU (Remote Terminal Unit) is a remote terminal device responsible for monitoring and controlling field signals and industrial equipment. It finds wide applications in oil and gas, water resource management, and municipal services. With the expanding market demand and accelerated growth trends, RTU applications are gaining momentum. Due to the impracticality of mains electricity in many RTU scenarios, they often rely on disposable batteries or solar power, necessitating designs with low power consumption.

Nuvoton M2354 Series Product

The NuMicro® M2354 series is a microcontroller product line based on the Arm® Cortex®-M23 core. This series operates at frequencies up to 96 MHz, with built-in 1024KB of FLASH and 256KB of SRAM. It operates on a voltage range of 1.7V to 3.6V, a temperature range of -40°C to +105°C, and supports various packages, including LQFP48, LQFP64, and LQFP128.

M2354 Series Selection Guide:

M2354 Series Block Diagram:

The Nuvoton M2354 series offers compelling features that make it the optimal choice for RTU applications:

1. High Security

The NuMicro® M2354 series microcontrollers are based on the Arm® Cortex®-M23 core and integrate TrustZone® technology based on Armv8-M architecture. The NuMicro® M2354 utilizes NuSMP 2.0 (Nuvoton Secure Microcontroller Platform), which complies with PSA Level 3 or similar security standards for IoT device security certification.

In addition to TrustZone® technology, this MCU series includes the following security features:

a) A secure bootloader supports trusted boot functionality.

b) Supports hardware encryption/decryption algorithms such as AES, RSA, and ECC, as well as algorithms like SM2, SM3, and SM4.

c) The Execute-Only-Memory (XOM) region prevents the CPU from reading data and protects critical code.

d) Flash lock bits to restrict external access or write to debugging interfaces of flash memory.

e) Tamper detection pins are used to monitor changes in suspicious states on the printed circuit board.

2. Low Power Consumption

a) Normal Run mode consumes 39.6 μA/MHz (DC-DC supply mode).

b) Deep Power-Down (DPD mode) current is less than 0.1 μA. RTC operation with 80 bytes of data retention consumes less than 0.5 μA.

M2354 Series Power Efficiency:

3. Large RAM

The M2354 series integrates 1024KB of FLASH and 256KB of SRAM, enabling efficient data processing and storage.

4. Rich Interfaces

a) The M2354 series supports 11 serial ports (including ISO7816 and USCI) and 1 CAN interface, facilitating easy external device expansion.

b) The M2354 series features a segment LCD driver interface (8*40), suitable for displaying information in low-power modes.

RTU Block Diagram: