T-BOX Hardware Solution: STM32+SD NAND (SMD TF Card) Combination

With the rapid development of intelligent connected cars, in-vehicleT-BOX (Telematics Box) serves as the core hub for interconnection between vehicles and the cloud. Its performance and reliability directly determine the upper limit of user experience.The high-performance T-BOX solution launched by MK based on the STM32H7RX main control chip and MKDV4GIL-AST (SD NAND chip TF card) large-capacity storage not only improves the system's response speed and data reliability, but also provides car companies with a cost-effective solution.

Powerful controller:STM32H7RX, double guarantee of performance and stability

STM32H7RXseries based onARM Cortex-M3 core, clocked at up to 72MHz, with rich peripheral interfaces (CAN, USART, SPI, USB, etc.), perfectly adapts to the multi-tasking needs of T-BOX:

Real-time response: Efficiently handle vehicle data collection, communication protocol analysis and remote command execution.

Low power consumption design: Meets the stringent energy consumption requirements of vehicle-mounted equipment and extends standby time.

High reliability: industrial grade chip standard,It operates in a wide temperature range of -40℃~85℃, and is not afraid of complex vehicle environments.

贴片式TF card MKDV4GIL-AST，数据存储无忧

T-BOX needs to continuously record data such as vehicle status, trajectory, fault logs, etc., and has extremely high requirements for storage capacity and stability.MKDV4GIL-AST (4Gb NAND Flash) is an ideal choice due to the following advantages:

High durability: long erasing and writing life, 100,000 timesPE erase and write, suitable for frequent data reading and writing scenarios.

LGA8 package:LGA (Land Grid Array) 8 package is a form of integrated circuit packaging. The LGA8 package adopts an area array pin layout. Compared with the traditional pin package, its size is smaller.6*8mmIt can achieve more pin connections on the same chip area, thereby effectively reducing the footprint of the package and improving the integration of the circuit board.

Anti-interference design: complies with vehicle vibration and electromagnetic compatibility (EMC) standards, data security is guaranteed.

High reliability: industrial grade chip standard,It operates in a wide temperature range of -40℃~85℃, and is not afraid of complex vehicle environments.

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Solution Highlights: Intelligent, safe, and scalable

Dual-core collaboration:STM32H7RXResponsible for real-time control,MKDV4GIL-AST（SD NAND）Efficient storage, clear division of labor, and smooth system.

Encrypted communication: supportedAlgorithms such as AES and SHA ensure data transmission security and prevent malicious intrusions.

Flexible expansion: reserved5G/4G module interface is compatible with future car networking upgrade needs.

Application scenarios: full coverage from passenger cars to commercial vehicles

Remote control car: mobile phoneUse the APP to check vehicle status, unlock doors, and schedule charging.

UBI Insurance: Accurately records driving behavior to provide a basis for personalized premium calculations.

Fleet management: Real-time monitoring of commercial fleet location, fuel consumption, and fault warning to reduce operation and maintenance costs.

T-BOX’s embedded technology route focuses on the following core points

Hardware architecture

MCU module: As a key component of T-BOX, MCU (Micro Control Unit) is responsible for communicating with the vehicle CAN bus.It collects and parses vehicle controller messages and accurately extracts key vehicle signals and parameter information, laying the foundation for vehicle data interaction.

MPU module: MPU (microprocessor unit) focuses on GPS positioning and wireless communication functions.The acquired GPS information and vehicle data are packaged according to the established protocol, and then reliably transmitted to the TSP (vehicle information service provider) through LTE wireless communication technology to achieve efficient data interaction between the vehicle and the cloud.

Bluetooth module: The Bluetooth module relies on Bluetooth wireless communication technology to communicate with the user’s mobile phone The APP establishes an interactive channel and fully supports functions such as Bluetooth key management, device authentication, and vehicle control, bringing users a convenient smart car experience.

Data module:T-BOX is usually equipped with MK SD NAND 、Memories such as eMMC are used to stably store various key data to ensure data security and traceability.

Power module: The power management module adopts The DC-DC converter and LDO (low dropout linear regulator) work together to provide stable and reliable power for 4G modules and MCUs to ensure stable operation of the equipment.

Interfaces and buses:T-BOX realizes device interconnection through a variety of interfaces and buses, covering traditional CAN (Controller Area Network), LIN (Local Area Internet Network), debugging interface RS232/RS485/USB2.0, and vehicle Ethernet (Ethernet) to meet data transmission needs in different scenarios.

software system

T-BOX is usually developed with deep customization based on Linux operating system (such as Ubuntu, CentOS, etc.).At the software function level, it supports OTA (Over-The-Air) software over-the-air upgrades to ensure that the system can be updated and iterated in a timely manner; at the same time, the USB analog serial port is used to achieve stable transmission of GPS signals to the vehicle to complete precise positioning, and to realize the audio and video delivery function of the vehicle system through the USB interface.In addition, the T-BOX software system integrates lwIP (Lightweight IP) sample firmware to efficiently implement network protocol stack functions and ensure the stability and efficiency of network communication.

Communication and wireless connection unit

BOX integrates wireless connection modules such as GSM/GPRS/LTE, GPS, Wi-Fi and Bluetooth, which can realize diverse functions such as mobile communication, positioning and navigation, and wireless hotspot connection.The antenna designs of these modules are flexible, with both external antennas and on-board internal antennas.In the cost structure of T-BOX, 3G/4G/5G communication modules occupy a dominant position, accounting for about 40% of the cost, which is a key factor affecting the overall cost of T-BOX.

In the wave of intelligence,The core of T-BOX determines the upper limit of user experience.STM32H7RXwithThe powerful combination of MKDV4GIL-AST not only improves T-BOX's response speed and data reliability, but also provides car companies with cost-effective solutions.MK continues to delve into technological innovation, promote industrial progress, and is committed to bringing customers better products and service experience.