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关于DS2432单片机：
The DS2432 combines 1024 bits of EEPROM, a 64-bit secret, an 8-byte register/control page with up to 5 user read/write bytes, a 512-bit SHA-1 engine and a fully-featured 1-Wire interface in a single chip.Data is transferred serially via the 1-Wire protocol，which requires only a single data lead and a ground return. The DS2432 has an additional memory area called the scratchpad that acts as a buffer when writing to the main memory ， the register page or when installing a new secret.Data is first written to the scratchpad from where it can be read back.
DS2432 FEATURES：
•On-chip 512-bit SHA-1 engine to compute 160-bit Message Authentication Codes (MAC) and to generate secrets
•Write access requires knowledge of the secret and the capability of computing and transmitting a 160-bit MAC as authorization
•Secret and data memory can be write-protected (all or page 0 only) or put in EPROMemulation mode (“write to 0”, page 1)
•Unique, factory-lasered and tested 64-bit registration number assures absolute traceability because no two parts are alike
•Built-in multidrop controller ensures compatibility with other 1-Wire net products
•Reduces control, address, data and power to a single data pin
•Directly connects to a single port pin of a microprocessor and communicates at up to 16.3k bits per second
•Overdrive mode boosts communication speed to 142k bits per second
•Low cost 6-lead TSOC surface mount package,or solder-bumped Flipchip package
•Reads and writes over a wide voltage range of 2.8V to 5.25V from -40°C to +85°C
