ADDRESSABLE SWITCHTM DESCRIPTION

The DS2407 Dual Addressable Switch Plus Memory is a pair of open drain N–channel transistors that can be turned on or off via the 1–Wire bus. Alternatively, either open drain output can serve as a logic input that can be monitored via the same 1–Wire bus. In addition, the device has 1024 bits of EPROM to store relevant information such as switch function, physical location, etc. The device is addressed by matching its individual 64–bit factory–lasered registration number. 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 DS2407 follows the standard Dallas Semiconductor 1–Wire protocol and can be accomplished with a single port pin of a microcontroller.

FEATURES

? Open drain PIO pins are controlled and their logic level can be determined over 1–WireTM bus for closed–loop control

? Dual Channel operation (TSOC package)

? PIO pin channel A sink capability of 50 mA at 0.4V with soft turn–on; channel B 8 mA at 0.4V

? Maximum operating voltage of 13V at PIO–A, 6.5V at PIO–B

? 1024 bits user–programmable OTP EPROM

? 7 bytes of user–programmable status memory to control the device

? Multiple DS2407s can be identified on a common 1–Wire bus and be turned on or off independently 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 error–free selection and absolute identity because no two parts are alike

? On–chip CRC16 generator allows detection of data transfer errors

? Built–in multidrop controller ensures compatibility with other MicroLANTM products

? Reduces control, address, data, programming 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/s

? Low cost TO–92 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

? Supports Conditional Search with user–programmable condition

? VCC bondout for optional external supply to the device (TSOC package only)

? Hidden Mode; the device will respond only to a Match ROM command or a Conditional Search when in this mode.