In Electronic Toll Collection (ETC) systems, the On-Board Unit (OBU) and Roadside Unit (RSU) must reliably store critical data—such as device IDs, transaction records, toll parameters, and status information—under demanding conditions involving high speed, extreme temperatures, strong vibration, and electromagnetic interference. The mainstream architecture typically adopts a "Main Control MCU + Communication Module + Security Module + Storage Unit" design. Compared to traditional Flash or FRAM, EEPROM stands out as the ideal choice for storing key parameters and logs due to its byte-level programmability (eliminating block erase), high endurance (over 1 million cycles), and excellent noise immunity. Its standard I²C interface simplifies communication design with the host MCU, while its low-power characteristics perfectly match the OBU's requirements for passive wake-up and long-term standby.
In ETC applications, a 32Kb EEPROM handles core tasks including device authentication, temporary transaction data storage, and system configuration storage. This capacity is sufficient to store information such as issuer codes, vehicle details, user account identifiers, multiple encrypted transaction records, and device operation status flags. Its technical advantages are threefold: Firstly, high reliability and long endurance ensure stable operation across the -40°C to 85°C temperature range, supporting over 1 million write cycles to prevent critical data loss throughout the device's lifecycle. Secondly, fast write response times at the millisecond level meet the need for rapid logging during high-speed passage, avoiding transaction failures due to write delays. Finally, extremely low standby power consumption and a wide operating voltage range allow it to retain data while the OBU sleeps and to adapt to voltage fluctuations in the vehicle's power system. For instance, the EEPROM must complete the storage of a pass record within milliseconds as a vehicle passes through the toll station, where its reliability directly determines the success and accuracy of the transaction.
Fudan Microelectronics' FM24C32D-TS-T-G is a high-performance 32Kb (4K x 8) serial EEPROM featuring a standard I²C bus interface and a compact TSSOP8 package. This device demonstrates exceptional stability and adaptability in harsh automotive applications like ETC systems. Compared to typical industrial-grade EEPROMs, its core parameters offer distinct advantages:
Core Parameter | FM24C32D-TS-T-G (Fudan Microelectronics) | Typical Industrial EEPROM | Core Value for ETC Systems |
Operating Voltage Range | 1.7V to 5.5V | 2.5V to 5.5V | A wider range, especially suitable for micropower systems as low as 1.8V and resilient to voltage dips during vehicle cold starts, ensuring stable data operations. |
Operating Temperature Range | -40°C to 85°C | -40°C to 85°C | Meets full automotive temperature range requirements, adapting to outdoor environments from extreme cold to intense heat. |
Write Endurance | 1 Million Cycles | 1 Million Cycles | High endurance meets the demands of frequent transaction logging, ensuring long-term reliable operation. |
Data Retention | 100 Years | 100 Years | Ultra-long data retention ensures critical parameters and identity information remain valid for the device's lifetime. |
Package | TSSOP8 | SOP8/TSSOP8 | A thinner package helps optimize PCB space, adapting to the trend of increasingly miniaturized OBU designs. |
The chip incorporates an advanced write protection mechanism via the WP pin, effectively preventing accidental data modification. Its page write function supports writing up to 32 bytes of data at once, significantly improving the storage efficiency for batch transaction data. In ETC system integration, the FM24C32D-TS-T-G can seamlessly connect with mainstream security chips or MCUs, with its stable I²C communication providing a solid foundation for real-time data access. As an official authorized distributor of Fudan Microelectronics, MANDU provides comprehensive technical support for ETC equipment manufacturers, covering product selection, reference circuit design, signal integrity debugging, and free sample applications. MANDU also ensures a stable supply chain, helping customers' products quickly pass relevant industry certifications.
For ETC device R&D engineers, the Fudan Microelectronics FM24C32D-TS-T-G EEPROM serves as a cornerstone for building stable and trustworthy data storage systems, thanks to its industrial-grade reliability, ultra-wide operating voltage range, and long-life characteristics. Its exceptional environmental adaptability and data integrity assurance fully align with the stringent quality requirements for core components in the intelligent transportation sector.
About Mandu Technology
Shenzhen Mandu Technology Co., Ltd. has steadfastly centered its operations on the distribution of high-performance, high-quality, and highly reliable integrated circuit products. Its portfolio encompasses memory chips, differential crystal oscillators, and MCU microcontrollers, while progressively integrating analog signal chain products. The company prides itself on delivering comprehensive and cost-effective solutions to its customers. Its products find applications across a broad spectrum of industries, including but not limited to network communication, industrial control, robotics, medical equipment, personal health, and numerous other fields.
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