DS2408S+ Integrated Circuits (ICs)

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1. DESCRIPTION

The DS2408S+ is an 8-channel, programmable I/O 1-Wire chip. PIO outputs are configured as open-drain and provide an on resistance of 100Ω 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. DS2408S+ operation is controlled over the single-conductor 1-Wire bus. Device communication follows the standard Dallas Semiconductor 1-Wire protocol. Each DS2408S+ has its own unalterable and unique 64-bit ROM registration number that is factory lasered into the chip. The registration number guarantees unique identification and is used to address the device in a multidrop 1-Wire net environment. Multiple DS2408S+ devices can reside on a common 1-Wire bus and can operate independently of each other. The DS2408S+ also supports 1-Wire conditional search capability based on PIO conditions or power-on-reset activity; the conditions to cause participation in the conditional search are programmable. The DS2408S+ has an optional VCC supply connection. When an external supply is absent, device power is supplied parasitically from the 1-Wire bus. When an external supply is present, PIO states are maintained in the absence of the 1-Wire bus power source. The RSTZ signal is configurable to serve as either a hard-wired reset for the PIO output or as a strobe for external circuitry to indicate that a PIO write or PIO read has completed.

2. FEATURES 

    1. Control Eight Independent I/O Port Pins from a Single Micro Port Pin

        - 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

    2. Minimalist 1-Wire Interface Lowers Cost and Interface Complexity

        - Built-in Multidrop Controller Ensures Compatibility with Other 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

    3. Wide Voltage and Temperature Operating Ranges Enables Robust System Performance

        - 2.8V to 5.25V

        - -40°C to +85°C Industrial Temperature Range

3. APPLICATION

The DS2408S+ is a multipurpose device. Typical applications include port expander for microcontrollers, remote multichannel sensor/actuator, communication and control unit of a microterminal, or as network interface of a microcontroller. Typical application circuits and communication examples are found later in this data sheet.