The DS2252T Secure Microcontroller Module incorporates the DS5002FP chip with a clock source and lithium back-up in a preassembled and tested SIMM form factor. The chip design employs a 100% 8051-compatible architecture based on NV RAM technology. It combines adaptive programming capability with advanced security features that strongly protect memory contents.
The DS2252T enables in-system programming and automatic loading of new encryption keys through the serial port. Users can designate and change memory partitions for program and data. The microcontroller decodes memory access to the SRAM, accesses memory via its bytewide bus and write-protects the program memory portion. The result: frequent, secure reprogramming with minimal effort.
Security features include a strong software encryption algorithm based on an 80-bit key word loaded from an on-chip true random number generator. (Customer-specific algorithms are available.) A Self-Destruct Input pin (SDI) is provided to interface to external tamper detection circuitry. An optional top-coating for the die is available to thwart microprobe techniques.
The DS2252T module includes a 32kHz crystal driving a permanently powered real-time lock with interrupts for time stamp and date. Crash-proof operation is ensured with power monitoring circuitry that includes power-fail reset, interrupt, and a watchdog timer. All nonvolatile memory and resources are maintained for over 10 years at room temperature in the absence of power.
The DS2252T is an ideal microcontroller for systems incorporating sensitive data and that require ultra-secure, time-stamped transactions. These include automatic access control to private or proprietary systems, digital monetary transactions, and software protection.
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