DESCRIPTION

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. Each DS2432 has its own 64-bit ROM registration number that is factory lasered into the chip to provide a guaranteed unique identity for absolute traceability. Data is transferred serially via the 1-Wire protocol, which requires only a single data lead and a ground return.

FEATURES


1128 bits of 5V EEPROM memory parti tioned into four pages of 256 bits, a 64-bit write-only secret and up to 5 general purpose read/write registers


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 transmit ting a 160-bit MAC as authorization


Secret and data memory can be write-pro tected (all or page 0 only) or put in EPROM emulation mode (“write to 0”, page 1)


Unique, factory-lasered and tested 64-bit reg istration number assures absolute traceability because no two parts are alike


Built-in multidrop controller ensures compati bility 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 mi croprocessor 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 pack age, 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