DESCRIPTION

The DS2405 Addressable Switch is an open drain N-channel transistor that can be turned on or off by matching the 64-bit factory-lasered registration number within each part. The 64-bit number consists of an 8-bit family code, a unique 48-bit serial number, and an 8-bit cyclic redundancy check. Communication with the DS2405 follows the standard Dallas Semiconductor 1-Wire protocol and can be accomplished with a single port pin of a microcontroller.

FEATURES

■ Open-drain PIO pin is controlled by matching 64-bit, laser-engraved registration number associated with each device

■ Logic level of open drain output can be determined over 1-Wire? bus for closed-loop control

■ PIO pin sink capability is greater than 4mA at 0.4V

■ Multiple DS2405s can be identified on a common 1-Wire bus and be turned on or off independent of other devices on the bus

■ Unique, factory-lasered and tested 64-bit registration number (8-bit family code +48-bit serial number +8-bit CRC tester) assures absolute identity because no two parts are alike

■ Built-in multidrop controller ensures compatibility with other MicroLAN 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 16.3kbits/s

■ 8-bit family code specifies DS2405 communications requirements to reader

■ 8-bit cyclic redundancy check ensures error free selection

■ Zero standby power required

■ Low cost TO-92, SOT-223, or 6-pin TSOC surface mount package

■ 1-Wire communication operates over a wide voltage range of 2.8V to 6.0V from -40°C to +85°C