DS2406

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ADDRESSABLE SWITCH

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 DESCRIPTION

The DS2406 Dual Addressable Switch Plus Memory offers a simple way to remotely control a pair of

open drain transistors and to monitor the logic level at each transistor’s output via the 1-Wire bus for

closed loop control. Each DS2406 has its own 64-bit ROM registration number that is factory lasered into

the chip to provide a guaranteed unique identity for absolute traceability. The device’s 1024 bits of

EPROM can be used as electronic label to store information such as switch function, physical location,

and installation date. Communication with the DS2406 follows the standard Dallas Semiconductor 1-

Wire protocol and can be accomplished with minimal hardware such as a single port pin of a

microcontroller. Multiple DS2406 devices can reside on a common 1-Wire network and be operated

independently of each other. Individual devices will respond to a Conditional Search command if they

qualify for certain user-specified conditions, which include the state of the output transistor, the static

logic level or a voltage transition at the transistor’s output.

DS2406 BLOCK DIAGRAM Figure 1

64-BIT

LASERED ROM

PROGRAM

VOLTAGE

DETECT

MEMORY

FUNCTION

CONTROL

CRC16

GENERATOR

PARASITE POWER

INT VDD

DATA

8-BIT

SCRATCHPAD

PIO-A

PIO-B

PIO

CONTROL

STATUS MEMORY

5 BYTES EPROM

1 BYTE SRAM

1-WIRE BUS

DATA MEMORY

1024-BIT EPROM

(4 PAGES OF

32 BYTES EACH)

1-WIRE

FUNCTION

CONTROL

VCC