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DS2408 application circuit (four channels)

2017-08-22 11:56  
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The DS2408 is an 8-channel, programmable I/O 1-Wire chip. PIO outputs are configured as open-drain and provide an on resistance of 100 _ max. A robust PIO channel-access communication protocol ensures that PIO output-setting changes occur error-free. A data-valid strobe output can be used to latch PIO logic states into external circuitry such as a D/A converter (DAC) or microcontroller data bus.

DS2408 Application circuit 

DS2408

This 4-bit DAC is controlled by a 1-Wire interface. (DS2408 outputs P4 to P7 are not used.)

 

 

DS2408 Features

 

*Eight Channels of Programmable I/O with Open-Drain Outputs

*On-Resistance of PIO Pulldown Transistor 100Ω (max); Off-Resistance 10MΩ (typ)

*Individual Activity Latches Capture Asynchronous State Changes at PIO Inputs for Interrogation by the Bus Master

*Data-Strobe Output to Synchronize PIO Logic States to External Read/Write Circuitry

*Built-in Multidrop Controller Ensures Compatibility with Other Dallas Semiconductor 1-Wire® Net Products

*Supports 1-Wire Conditional Search Command with Response Controlled by Programmable PIO Conditions

*Unique Factory-Lasered 64-Bit Registration Number Ensures Error-Free Device Selection and Absolute Part Identity

*Communicates to Host with a Single Digital Signal at 15.3kbps or 100kbps using 1-Wire Protocol

*Operating Range: 2.8V to 5.25V, -40°C to +85°C