SBC Hardware Architecture for Beginners: From Raspberry Pi to Industrial Smart Terminals, Explained in One Article

1. Why SBCs Are Transforming Embedded & Industrial Systems

Have you ever wondered how a palm-sized board can:

• Run Linux

• Decode 4K video

• Perform AI inference

• Connect to cameras and sensors

• Control industrial equipment

The answer lies in SBCs (Single Board Computers).

Traditional industrial control systems relied on bulky architectures consisting of:

• Chassis

• Motherboards

• Power supplies

• Expansion cards

This approach resulted in large size, high power consumption, complex wiring, and difficult maintenance.

Today, SBCs integrate all core functions into one compact board, enabling:

• Lower power consumption

• Smaller form factor

• Faster deployment

• Higher integration

That’s why SBCs are now widely used in:

• Digital signage

• Industrial edge gateways

• Smart factories

• AI vision terminals

• Smart homes and robotics

SBCs sit perfectly between MCUs (too limited) and traditional PCs (too bulky), offering a balanced combination of general computing power and embedded reliability.

2. SBC Architecture at a Glance

An SBC can be understood through five core modules:

SoC = Brain
Memory & Storage = Hands and Feet
PMU = Heart
Peripheral Interfaces = Senses
Boot System = Ignition Switch

Let’s examine each module in detail.

3. SoC: The Brain of an ARM-Based SBC

The SoC (System on Chip) is the most critical component.
Unlike a traditional CPU, an SoC integrates multiple subsystems into a single chip.

What Does an SBC SoC Integrate?

• ARM CPU cores (Cortex-A series)

• GPU for UI and graphics acceleration

• NPU / DSP for AI inference and signal processing

• Memory controller (DDR / LPDDR)

• Video codecs (H.264 / H.265 / VP9)

• DMA engines for high-speed data transfer

• Power management logic (DVFS)

This high integration dramatically improves performance per watt and reduces system complexity.

Example Comparison: Allwinner H616 vs Rockchip RK3588 

👉 Key takeaway:
Don’t blindly choose “high-end”. Match SoC capability to real application needs.

Design Considerations

• Heterogeneous architectures improve real-time performance

• AI applications require dedicated NPUs

• Thermal design must be planned early for high-performance SoCs

4. Memory & Storage: The Hidden Performance Bottleneck

Many developers focus on CPU frequency but overlook memory and storage.
In reality, RAM and Flash performance often determine system responsiveness.

RAM: The Execution Workspace

• Common types: LPDDR3 / LPDDR4

• Capacity range: 512MB – 8GB

• Typically soldered on-board for reliability

Recommendations:

• ≥2GB for multitasking Linux systems

• High-resolution displays require wider memory buses

• Incorrect memory mapping can cause kernel boot failures

Storage: More Than OS Installation

Common storage options:

1. microSD – low cost, short lifespan

2. eMMC – industrial standard, stable and reliable

3. NVMe SSD (via M.2 / PCIe) – near PC-level performance

Industrial best practice:

• Use microSD only for prototyping

• Use eMMC for mass production

• Enable read-only rootfs for high-reliability systems

5. PMU: The Silent Power Manager

An SBC does not simply run on “5V power”.

Different modules require different voltages:

• CPU core: ~0.8V

• DDR: ~1.1V

• I/O: 3.3V

The PMU (Power Management Unit) manages all these rails.

What a PMU Handles

• Multi-rail voltage generation

• Power-on sequencing

• Battery charging & monitoring

• Overvoltage and overcurrent protection

• Software-controlled shutdown and wake-up

This enables features like:

• Battery-backed operation

• Scheduled wake-up

• Safe power recovery after outages

6. Peripheral Interfaces: How SBCs Connect to the World

SBC flexibility comes from its rich interfaces:

Pin Multiplexing: Power with Responsibility

Most pins support multiple functions.
Incorrect pin configuration in the device tree is a common cause of peripheral failures.

Best practices:

• Watch voltage levels (3.3V ≠ 5V)

• Carefully route high-speed signals

• Avoid I²C address conflicts

7. Boot Process: From Power-On to Linux

The SBC boot sequence is precise and unforgiving:

Power On → BootROM → U-Boot → Linux Kernel → RootFS → User Space

Key Stages

• BootROM: Factory code, selects boot device

• U-Boot: Initializes hardware, loads kernel

• Device Tree: Describes board-level hardware

• RootFS: Starts system services

A single configuration error can lead to a black screen or boot failure.

8. Real-World Example: Industrial Smart Gateway

Application requirements:

• Zigbee device management

• Cloud MQTT communication

• High reliability and self-recovery

Hardware configuration:

• SoC: RK3568

• RAM: 4GB LPDDR4

• Storage: 16GB eMMC

• Interfaces: Ethernet, USB, UART, GPIO

• PMU: Battery backup + watchdog

Reliability design:

• Hardware watchdog

• Automatic reboot on failure

• Remote log upload

This is a typical industrial-grade ARM SBC deployment.

9. SBCs: Not a Toy, but Industrial Infrastructure

SBCs are now widely used in:

• Industrial automation

• Smart agriculture

• AI edge computing

• Autonomous systems

• Aerospace experiments

Their success comes from:

• Standardized interfaces

• Massive open-source ecosystem

• Low learning curve

• Excellent performance-per-watt

With advances in AI accelerators, RISC-V, and TSN networking, SBCs will play an even greater role in future intelligent systems.

10. Final Checklist Before Choosing an SBC

Before starting your project, ask:

• Does the SoC meet my AI and compute needs?

• Is RAM sufficient for my workload?

• Is storage reliable enough for long-term use?

• Is the power design robust?

• Is the device tree correctly configured?

Answer these clearly—and your project success rate will increase dramatically.