DS1482

1-Wire Level Shifter and Line Driver with Load Sensor


Please check latest availability status for a specific part variant.

Description

The DS1482 is a simple 1-Wire® line driver with load sensor and level shifter, designed to function as an interface between a 3V host system and a 1-Wire system that runs on 5V. Two supplies are provided, a 5V supply for the 1-Wire operations (VCC) and an interface supply (VCCQ). The DS1482 can connect directly to a synchronous serial port if it supports the appropriate bit rates to generate 1-Wire timing.

Figure 1, of the full data sheet, shows the DS1482 block diagram. TXD is buffered and controls an N-channel transistor, which drives the 1-Wire pin I/O low, e.g., to initiate a time slot. The logic level of the I/O pin is returned through a level-shifting buffer to the RXD pin for the host processor to read. Figure 3, of the full data sheet, shows the relationship of these signals in case of a 1-Wire read time slot.

The SPU input generates a control signal (PCTLZ) for an external low-impedance PMOS transistor (Figure 2 of the full data sheet) that bypasses the 1-Wire pullup resistor (RPUP) to provide power for 1-Wire devices with a high-load current. PCTLZ is gated by the inverted TXD signal. This prevents a high through-current in case TXD and SPU are high at the same time.

The DS1482 contains a high-precision comparator because it is important for the host micro to know when the high load on the 1-Wire side is no longer active. As shown in Figure 4, of the full data sheet, the high current load causes a small drop of the voltage on the I/O pin. The comparator detects when the high current phase ends, and enables DONE after the deglitching time tCF is over. The START signal allows the host micro to selectively enable DONE.

Key Features

  • Works with All iButtons® and 1-Wire Devices
  • Communicates at Regular and Overdrive 1-Wire Speed (Host-Dependent)
  • Separate Interface Power Supply to Level Shift to Non-5V Systems
  • External Strong-Pullup Control Pin can be Used to Provide Low-On-Resistance-High Current Power Source
  • Load Sensor to Detect when Strong-Pullup Power Delivery is no Longer Needed
  • Power Delivery DONE Signal can be Connected to Host Interrupt
  • Low-Cost 16-Pin SO Surface-Mount Package
  • Operating Temperature Range: -40°C to +85°C

Applications/Uses

  • 3.3V Processor Systems Requiring a 5V 1-Wire Interface

Quality and Environmental Data

Product Reliability Reports: DS1482.pdf 
Lead-Free Package Tin (Sn) Whisker Reports
Device   Fab Process   Technology   Sample size   Rejects   FIT at 25°C   FIT at 55°C  

Note : The failure rates are summarized by technology and mapped to the associated material part numbers. The failure rates are highly dependent on the number of units tested.

Quality Management System >
Environmental Management System >

 
Status:
Package:
Temperature:

Related Resources


MAX22700D
Ultra-High CMTI Isolated Gate Drivers

  • Matching Propagation Delay
  • High CMTI (300kV/μs, typ)
  • Robust Galvanic Isolation

MAX22701D
Ultra-High CMTI Isolated Gate Drivers

  • Matching Propagation Delay
  • High CMTI (300kV/μs, typ)
  • Robust Galvanic Isolation

MAX22700E
Ultra-High CMTI Isolated Gate Drivers

  • Matching Propagation Delay
  • High CMTI (300kV/μs, typ)
  • Robust Galvanic Isolation

MAX22701E
Ultra-High CMTI Isolated Gate Drivers

  • Matching Propagation Delay
  • High CMTI (300kV/μs, typ)
  • Robust Galvanic Isolation

MAX22702D
Ultra-High CMTI Isolated Gate Drivers

  • Matching Propagation Delay
  • High CMTI (300kV/μs, typ)
  • Robust Galvanic Isolation

MAX22702E
Ultra-High CMTI Isolated Gate Drivers

  • Matching Propagation Delay
  • High CMTI (300kV/μs, typ)
  • Robust Galvanic Isolation

MAX22515
IO-Link Transceiver with Integrated Protection

  • High Configurability and Integration Reduces SKU
  • Integrated Protection Enables Robust Systems
  • Optimized for Small Designs

MAX22503E
100Mbps Full-Duplex 3V/5V RS-485/RS-422 Transceiver with High EFT Immunity

  • High-Speed Operation
  • Integrated Protection Increases Robustness
  • Flexibility for Many Different Applications

MAX96715
13-Bit GMSL Serializer with High-Immunity/ Bandwidth Mode and Coax/STP Cable Drive

  • Ideal for Safety Camera Applications
    • Works with Low-Cost 50Ω Coax (100Ω STP) Cables
    • Error Detection of Video/Control Data
    • High-Immunity Mode for Robust Control-Channel EMC Tolerance
  • High-Speed Data Serialization for Megapixel Cameras
    • Up to 1.74Gbps Serial-Bit Rate
    • 12.5MHz to 116MHz x 12-Bit + H/V Data through Internal Encoding
  • Multiple Modes for System Flexibility
    • 9.6kbps to 1Mbps Control Channel in I²C Mode (with Clock Stretch)
    • Crosspoint Switch Accepts Any Input Bitmap
    • Modes for Encoded VSYNC and HSYNC


  • Belle Isle 2020
    05/29/2020 - 05/31/2020, Detroit, MI
    2020 Detroit Grand Prix - Chevrolet Detroit Grand Prix presented by Lear Fast Facts The Chevrolet Detroit Grand Prix presented by Lear was hosted on Belle Isle, May 29 - 30 2020. The event featured the cars of the NTT IndyCar Series, the IMSA WeatherTech SportsCar Championship and the Trans Am Series presented by Pirelli. The weekend is collectively referred to as the Chevrolet Detroit Grand Prix presented by Lear and it once again featured the Chevrolet Dual in Detroit IndyCar doubleheader.

    RSVP