Maker : Dallas Semiconducotr
Part No. : DS2401X1

  Datasheet PDF : DS2401X1.pdf
  Cross Reference : DS2401X1 Cross Reference
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Shortcut : DS2401X1 

Product Information

DS2401 Silicon Serial Number www.dalsemi.com FEATURES § Upgrade and drop-in replacement for DS2400 - Extended 2.8 to 6.0 voltage range - Multiple DS2401s can reside on a common 1-Wire bus § Unique, factory-lasered and tested 64-bit registration number (8-bit family code + 48bit serial number + 8-bit CRC tester); guaranteed no two parts alike § Built-in multidrop controller ensures compatibility with other MicroLAN products § 8-bit family code specifies DS2401 communications requirements to reader § Presence Pulse acknowledges when the reader first applies voltage § Low-cost TO-92, SOT-223 and TSOC surface mount packages § Reduces control, address, data, and power to a single pin § Zero standby power required § Directly connects to a single port pin of a microprocessor and communicates at up to 16.3 kbits/s § TO-92 tape & reel version with leads bent to 100 mil spacing (default) or with straight leads (DS2401T-SL) § Applications - PCB Identification - Network Node ID - Equipment Registration § Operates over industrial temperature range of -40°C to +85°C PIN ASSIGNMENT TO-92 DALLAS DS2401 TSOC PACKAGE TOP VIEW 3.7 X 4.0 X 1.5 mm 1 2 3 1 2 3 TOP VIEW See Mech. Drawings Section BOTTOM VIEW PIN DESCRIPTION Pin 1 Pin 2 Pin 3 Pin 4 Pin 5-6 TO-92/SOT-223 Ground Data (DQ) No Connect Ground − TSOC Ground Data (DQ) No Connect No Connect No Connect ORDERING INFORMATION DS2401 DS2401Z DS2401T DS2401T-SL DS2401Y DS2401P DS2401V DS2401X1 TO-92 Package SOT-223 Surface Mount Package Tape & Reel of DS2401 Like DS2401T but straight leads Tape & Reel of DS2401Z TSOC Surface Mount Package Tape & Reel of DS2401P Chip Scale Pkg., Tape & Reel 1 of 10 102199 DS2401 DESCRIPTION The DS2401 enhanced Silicon Serial Number is a low-cost, electronic registration number that provides an absolutely unique identity which can be determined with a minimal electronic interface, typically a single port pin of a microcontroller. The DS2401 consists of a factory-lasered, 64-bit ROM that includes a unique 48-bit serial number, an 8-bit CRC, and an 8-bit Family Code (01h). Data is transferred serially via the 1-Wire protocol which requires only a single data lead and a ground return. Power for reading and writing the device is derived from the data line itself with no need for an external power source. The DS2401 is an upgrade to the DS2400. The DS2401 is fully reverse-compatible with the DS2400 but provides the additional multi-drop capability that enables many devices to reside on a single data line. The familiar TO-92, SOT-223 or TSOC package provides a compact enclosure that allows standard assembly equipment to handle the device easily. OPERATION The DS2401’ internal ROM is accessed via a single data line. The 48-bit serial number, 8-bit family s code and 8-bit CRC are retrieved using the Dallas 1-Wire protocol. This protocol defines bus transactions in terms of the bus state during specified time slots that are initiated on the falling edge of sync pulses from the bus master. All data is read and written least significant bit first. 1-WIRE BUS SYSTEM The 1-Wire bus is a system which has a single bus master system and one or more slaves. In all instances, the DS2401 is a slave device. The bus master is typically a microcontroller. The discussion of this bus system is broken down into three topics: hardware configuration, transaction sequence, and 1-Wire signaling (signal type and timing). For a more detailed protocol description, refer to Chapter 4 of the Book of DS19xx iButton Standards. Hardware Configuration The 1-Wire bus has only a single line by definition; it is important that each device on the bus be able to drive it at the appropriate time. To facilitate this, each device attached to the 1-Wire bus must have an open drain connection or 3-state outputs. The DS2401 is an open drain part with an internal circuit equivalent to that shown in Figure 2. The bus master can be the same equivalent circuit. If a bidirectional pin...

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