Home	Data Sheets	Products	Press Room	Company Info	Sales Offices
	Search Engine Site Map FTP Site Technical Support Parametric Search

1-Wire Chip Products
Contents: DS2401 Silicon Serial Number DS2404 EconoRAM Time Chip DS2405 Addressable Switch DS2406 Dual Addressable Switch DS2409 MicroLAN Coupler DS2417 1-Wire Time Chip With Interrupt DS2423 1-Wire RAM With Counters DS2430A/DS2433 1-Wire EEPROM DS2450 1-Wire Quad A/D Converter DS2480B Serial 1-Wire Line Driver DS2490 USB to 1-Wire Bridge Chip DS2502/DS2505/DS2506 Add-Only Memories DS2890 1-Wire Potentiometer DS9502/DS9503 ESD Protection Diodes UniqueWare Devices iButton Products Technical Support		DS2401 Silicon Serial Number Features: Unique factory-lasered 64-bit ROM registration number 1-Wire network compatible with built-in multidrop controller Operating power derived entirely from the single contact 1-Wire® bus Wide operating voltage range (2.8V to 6.0V) and industrial temperature range (-40°C to +85°C) 6-pin TSOC, TO-92, and die-sized Chip Scale Package (CSP) The DS2401 Silicon Serial Number is a low-cost electronic registration number that provides an absolutely unique identity which can be determined with a minimal 1-Wire electronic interface. It provides a factory-lasered, unique, 64-bit ROM registration number for identification and/or network addressability for the system or device to which it is attached. The device is completely operated with the single-contact 1-Wire bus interface that is easily implemented from a spare processor port pin. Applications: PCB identification/labeling Aftermarket product management Network node address Equipment registration Related Information: Automatic Information application notes, technical briefs and articles, standards, and related articles DS2404 EconoRAM Time Chip Features: Y2K compliant Real-Time Clock ±2 minutes/month RTC accuracy with external 32.768kHz crystal Power-on interval timer and power cycle counter Programmable alarm interrupt for RTC, interval timer, and cycle counter Interrupt notification from 1-Wire and/or open drain interrupt output Provides both 1-Wire and 3-wire interfaces to enable dual-port access 4096 bits of low power NV memory 1Hz open drain output for system timing Fully 1-Wire network compatible Unique factory lasered 64-bit registration number Programmable to respond to Conditional Search ROM communication 2.8V to 6V, -40°C to +85°C operation 16-pin DIP, 16-pin SOIC, 16-pin SSOP, CSP The DS2404 EconoRAM Time Chip is a highly integrated clock/calendar and storage device incorporating full featured RTC timing functions and 4Kbits of NVRAM. A 32-bit RTC counter enables Y2K capable timekeeping with an alarm interrupt, timekeeping accuracy is ±2 minutes/month with an external 32.768kHz crystal. Two additional 32-bit counters track the number of times Vcc power is cycled and the cumulative amount of time Vcc is applied. Programmable alarm interrupt conditions can be programmed for all three counters with interrupt notification on the 1-Wire bus or an external open-drain interrupt pin. Dual-port communication and control of the DS2404 is enabled with two interfaces: 1-Wire and 3-wire. Port arbitration and selection is automatically performed by the device on a first come first served basis. The DS2404 also provides 4096 bits of low power NVSRAM. This device also provides a unique, factory-lasered 64-bit registration number and can multi-drop in a 1-Wire device network environment. Applications: Expiration timer for equipment rental Operation/interval timer for warranty management Time stamp and memory for data acquisition systems Stop watch Event scheduling Battery usage timer DS2405 Addressable Switch Features: Open drain PIO pin controlled/read over the 1-Wire bus PIO state controlled by matching 64-bit ROM ID PIO channel characteristics: 4mA at 0.4V sink, 6V max Responds to Conditional Search ROM communication when PIO is set LOW. Unique factory lasered 64-bit registration number On-chip CRC8 generator enables error free communication Operating power derived entirely from the 1-Wire bus Fully 1-Wire network compatible 2.8V to 6V, -40°C to +85°C operation 6-pin TSOC, TO92, CSP The DS2405 Addressable Switch provides a simple and low-cost way to remotely control an open drain transistor and to monitor the logic level at the transistor output via the 1-Wire bus. The device is turned on/off and read using 1-Wire Match ROM command communication. The PIO channel is capable of sinking 4mA at 0.4V and can withstand up to 6V of applied voltage. Each device contains a unique factory-lasered 64-bit ROM registration number guaranteeing unique identification and absolute traceability. Communication with the device follows the standard Dallas Semiconductor 1-Wire protocol which allows for multiple devices to reside on a common 1-Wire bus and to be operated independently. Applications: Motor/actuator control LED control DS2406 Dual Addressable Switch Plus 1 Kbit Memory Features: Dual open drain PIO read/write channels are remotely controlled over 1-Wire bus Channel A sink capability of 50mA typically at 0.4V; channel B 8mA at 0.4V Maximum operating voltage of 13V at PIO-A, 6.5V at PIO-B Activity latch with each channel to capture short pulses 1024 bits user-programmable OTP EPROM Operates over a wide voltage range of 2.8V to 6.0V from -40°C to +85°C Supports Conditional Search with user-programmable condition Low cost TO-92 (Channel A only) or 6-pin TSOC surface mount, or die-size flip chip package The DS2406 Dual Addressable Switch Plus 1 Kbit Memory is a sensor/actuator chip for control applications. Its two voltage sensors and two output transistors can be dynamically configured for operation as one sensor and one switch, two sensors, or two switches. Both voltage sensors are designed to capture a one-shot, short pulse (such as one generated by a piezo-sensor or momentary contact closure) and set a flag. Devices that have flags set can be singulated under software control providing a quick way to monitor for status changes in a large sensor network. The flexibility of the DS2406 is enhanced by 1024 bits of user-programmable and write-protectable EPROM memory. This memory's data can be used to describe a physical location, identify the controlled equipment, calibrate the sensor, or reference the actuator to a specific sensor. This allows the bus master to know the exact name and location of a device without referencing a central database. Because it is dual-channel, the DS2406 can drive bi-directional opto-isolators. One channel lights the LED while the other senses the response. This feature is used to build electrically safe opto-isolated interfaces to control high-power devices such as electric motors, heating or air conditioning systems. Applications: Automation in homes, laboratories or factories Burglar alarms Irrigation control Greenhouses Vending machines Related Information: Automatic Information application notes, technical briefs and articles, standards, and related articles DS2409 MicroLAN Coupler Features: Low impedance "high side" switch to create and control multi-level branches (sub-networks) in a 1-Wire Network Common ground-reference with host computer throughout the whole network Supplies energy to inactive branches to maintain device status Provides short-proof access points for iButton probes Smart protocol assists host computer when analyzing network topology and population Supports conditional search for fast event signaling Programmable open drain control output for automatic visualization of branch status or hand-shake purposes Auxiliary 1-Wire output for 1-Wire memory chip or as digital input The DS2409 MicroLAN Coupler is an essential component to build and control 1-Wire networks with multi-level branching. In contrast to approaches that switch the ground line, the coupler maintains a common ground level for the whole network and keeps the inactive segments powered. This simplifies supplying central or local power for additional circuitry and prevents loss of status of parasitically powered devices. Both the main and the auxiliary 1-Wire output are supported by a "smart-on" command which generates a reset/presence sequence on the selected output before the electronic switch connects it to the active section of the network. This enables the host computer to send a ROM function command to the devices on the just activated segment with all other devices in the network remaining deselected, speeding up the analysis of topology and population of the network. The coupler also supports the bus master in detecting arrivals on the inactive segments of the network by responding to the conditional search command. The control output can be used to optically signal the on/off state of a branch by means of an LED or, together with the auxiliary output, for handshaking in dual-master applications. The network size can be maximized by using a DS2480B Serial 1-Wire Line Driver at the host computer's serial interface. The DS2480B compensates for the rising ground level caused by the non-zero on-resistance of couplers in multi-level networks. Applications: Short-proof access and inventory control systems Load reduction in large 1-Wire networks Providing physical location data in 1-Wire networks, equipment or card racks 1-Wire networks for dual-host operation Dual-port buffer for host to host communication via 1-Wire bus Related Information: Automatic Information application notes, technical briefs and articles, standards, and related articles DS2417 1-Wire Time Chip with Interrupt Features: Low-cost real time clock with 1-Wire bus communication Programmable periodic interrupt with open-drain output for system wakeup or timing functions Y2K-capable 32-bit RTC counter with ±2 minute/month accuracy High current sink capability of open drain alarm interrupt: 10mA at 5 volts or 5 mA at 3 volts Wide operating voltage range: 2.5V to 5.5V Very low operating power: <1µA at 3 volts 6-pin TSOC or die-size flip chip package The DS2417 1-Wire Time Chip with Interrupt contains a unique lasered ROM and a binary counter that increments once per second. If enabled, the device generates periodic interrupts at a user-selected rate. Utilizing a backup energy source, the data is nonvolatile and allows for standalone operation. The DS2417 adds functions such as calendar, time and date stamp, and logbook to any type of electronic device or embedded application that uses a microcontroller. Applications: Time/date stamping in data acquisition systems Clock with alarm Data logging Time/date display for mobile phone Fax machine time and date Related Information: Automatic Information application notes, technical briefs and articles, standards, and related articles DS2423 1-Wire RAM with Counters Features: Two externally-clocked 32-bit counters compatible with reed and Wiegand switches 4Kbit general purpose SRAM partitioned into sixteen 256-bit pages Two 32-bit counters to record write cycles to two of the sixteen memory pages On-chip debouncing for counter inputs On-chip 16-bit CRC generator for safeguarding data transfers 1-Wire Net-compatible interface to access to both memory and counters 6-pin TSOC or die-size flip chip package Reads, writes and counts over a wide voltage range of 2.8V to 5.5V from -40°C to +85°C The DS2423 1-Wire RAM with Counters is a fully static, read/write memory for battery operation organized as sixteen pages of 256 bits each. In addition, the device has four counters, two of them with external trigger inputs. Each of the counters is associated with a memory page. A counter without external trigger input increments each time data is written to the page it is associated with (Write Cycle Counter). The counters triggered by inputs A and B, respectively, increment with every low-going pulse on their input. All counters are read-only. They are automatically cleared to zero when the battery is connected. The battery-backed memory offers a simple solution to storing and retrieving information pertaining to the equipment where the DS2423 is installed. A 64-bit registration number is factory lasered into each DS2423 to provide a guaranteed unique identity which allows for absolute traceability and acts as node address if multiple DS2423 are connected in a 1-Wire Network. Data is transferred serially via the 1-Wire protocol which requires only a single data line and a ground return. The DS2423 can store encrypted data. The unique registration number and the page write cycle counter(s) prevent unauthorized manipulation of data stored in a page with a write cycle counter associated. Applications: Event monitoring/counting with remote access Utility meters Flow meters Traffic counters Related Information: Automatic Information application notes, technical briefs and articles, standards, and related articles DS2430A/DS2433 1-Wire EEPROM Features: Strict R/W protocol with intermediate scratchpad ensures integrity of data transfer Unique factory lasered 64-bit registration number Fully 1-Wire network compatible Operating power, including EEPROM writes, derived entirely from the 1-Wire bus 2.8V to 6V, -40°C to +85°C operation Device Memory Size Package Options DS2430A 256-Bit 6-pin TSOC, TO92, CSP DS2433 1K-Bit 8-pin SOIC, PR-35, CSP The DS2430A and DS2433 1-Wire EEPROM are used to uniquely identify the product in which it is used as well as store relevant product information including critical parameters, calibration constants, board configurations or manufacturing information. EEPROM is organized into 256 bit page(s) and operates with a transfer protocol that includes scratchpad, strict read/write protocols, and 16-bit CRC (DS2433 only) to ensure data integrity during transfers. Communication with the device follows the standard Dallas Semiconductor 1-Wire protocol which allows for multiple devices to reside on a common 1-Wire bus and to be operated independently. Power for reading and writing is derived from the 1-Wire bus with no need for an external power source. Applications: Auto-configurable add-in cards PCB identification and manufacturing data storage Aftermarket product management Information attachment to accelerometer, pressure, humidity, or temperature smart sensors IEEE 1451.4 smart sensors Battery pack chemistry identification DS2450 1-Wire Quad A/D Converter Features: A/D converter with 4 analog input channels controlled with the 1-Wire bus Two user programmable analog input voltage ranges: 2.56 volts and 5.12 volts User-programmable conversion resolution: 1 to 16 bits 8-bit conversion accuracy Unused analog inputs can be used as general-purpose open drain outputs Alarm state and notification can be established for above- and below-range analog input conditions Very low operating power: 2.5mW active, 25µW idle 8-pin SOIC package The DS2450 1-Wire Quad A/D Converter is a successive-approximation analog-to-digital converter with a 4-to-1 analog multiplexer. Channels not used as analog input can serve as digital open-drain output. Individual threshold registers and alarm flags for each channel indicate if the voltage measured was too high or too low without requiring the bus master to do the comparison. The device gets power either through the 1-Wire bus or through its VDD pin. An onchip CRC16 generator protects the communication against transmission errors. Applications: Remote data acquisition Over/under voltage monitoring Battery-operated systems Battery monitoring System diagnostics Temperature measurement Related Information: Automatic Information application notes, technical briefs and articles, standards, and related articles Evaluation/Development Kit: The DS2450K Evaluation Kit enables evaluation and development of numerous 1-Wire A/D applications. Purchase the kit online at our iButton Online Store. DS2480B Serial 1-Wire Line Driver with Load Sensor Features Common-ground serial port to 1-Wire line driver communicates with all iButtons and 1-Wire Chips Self-calibrating time base generates the correct 1-Wire timing for regular and Overdrive 1-Wire speed independently of program execution or CPU speed Interfaces directly to the UART of a microprocessor Load sensor terminates stiff pullup if current demand drops Compatible with all serial ports that support 9.6 kbps Can be set to 19.2 kbps, 57.6 kbps and 115.2 kbps under software control Generates 12V EPROM programming pulse and stiff 5V pull-up for Crypto iButton, sensors and EEPROMs Compatible with optical, IR, and RF to RS-232 converters Operates over 4.5V to 5.5V from -40°C to +85°C The DS2480B Serial 1-Wire Line Driver with Load Sensor is a serial port to 1-Wire interface chip that supports standard and Overdrive speeds. It connects directly to UARTs and 5V RS-232 systems. Command codes received from the host's crystal controlled UART serve as a reference to continuously calibrate the on-chip timing generator. This relieves the host of the burden of generating the time-critical 1-Wire communication waveforms. The DS2480B uses a unique protocol that merges data and control information without requiring control pins. This approach maintains compatibility to off-the-shelf serial to wireless converters allowing easy realization of 1-Wire media jumpers. The various control functions of the DS2480B are optimized for 1-Wire networks and support the special needs of all current 1-Wire devices. Applications Plug-in 1-Wire adapters 1-Wire EPROM programmers Handheld iButton readers 1-Wire networks 1-Wire media jumper for RS232-based systems Related Information: Automatic Information application notes, technical briefs and articles, standards, and related articles DS2490 USB to 1-Wire Bridge Chip Features: Supports regular, overdrive, and flexible 1-Wire communication speeds Extensive programmability of 1-Wire waveform characteristics Slew-rate controlled 1-Wire waveforms Accurate crystal oscillator derived 1-Wire waveform timing Stiff 5V pull-up and 12V input for programming or conversions Separate FIFOs, 16 or 64 bytes, for host to 1-Wire and 1-Wire to host communication Low to high-level USB command types for generating 1-Wire communication. 3 command types for device operation: Mode, Control, and Communication Supports USB remote wakeup - enables method to wakeup a suspended PC with attachment of a 1-Wire device Full-speed 12Mbps USB interface with integrated transceiver 24-pin SOIC, CSP The DS2490 USB to 1-Wire Bridge Chip is a Universal Serial Bus (USB) to 1-Wire interface chip that supports standard, overdrive, and flexible 1-Wire communication speeds. 1-Wire data I/O as well as device specific command and control are performed using vendor-specific USB device protocols. The DS2490 is fully supported by the Dallas Semiconductor TMEX API in a Microsoft Windows 98 OS environment. A stand-alone device driver and API for Win98 is also available. Applications 1-Wire bridging from a USB enabled processor USB to 1-Wire PC port adapters USB fob products that incorporate 1-Wire chip or iButton technology 1-Wire port addition to a USB Hub DS2502/DS2505/DS2506 Add-Only Memories Features: 1-Wire operation for both programming and reading EPROM Unique factory lasered 64-bit registration number On-chip CRC generator enables error free communication Fully 1-Wire network compatible Operating power derived entirely from 1-Wire Memory organized into 256 bit pages with the provisions for individual page write protection Strict R/W protocol with intermediate scratchpad ensures integrity of data transfer 2.8V to 6.0V read, 12V@10mA write, -40°C - +85°C operation Device Memory Size Package Options DS2502 1K-Bit 6-pin TSOC, 8-pin SOIC, TO92, CSP DS2505 16K-Bit 6-pin TSOC, TO92, CSP DS2506 64K-Bit 8-pin SOIC, PR-35, CSP Add-only memories are ideally suited for product applications in which a product needs to be identified and information about the product needs to be permanently maintained. The DS250x series offers a variety of memory density and package options with a common 1-Wire bus interface. This provides a painless upgrade path with software simply recognizing the device type which is embedded in the 64-bit registration number. Applications Aftermarket product management Calibration constant storage Maintenance records PCB identification/labeling Network Node Address Equipment registration DS2890 1-Wire Potentiometer Features: 100K-ohm single element, 256-position, linear potentiometer Handles 11V operating voltage on potentiometer terminals Terminal operating voltage independent of device power supply voltage Wiper position controlled and read over single-contact 1-Wire bus interface Supports Overdrive mode (142 kbits/second) Unique, factory-lasered 64-bit ROM ID and can multi-drop in a 1-Wire device network environment 2.8V to 6.0V, -45°C to +85°C operating range 6-pin TSOC, TO-92, CSP The DS2890 1-Wire Potentiometer is a linear taper digitally controlled potentiometer with 256 wiper positions. Device operation, including wiper position, is controlled over the single contact 1-Wire bus for the ultimate in electrical interface simplicity. With a wide 0V-11V working voltage range for the potentiometer terminals, the DS2890 is ideal for a broad range of industrial and control applications. Potentiometer terminal voltage is independent of device supply voltage as well as the voltage applied to the other potentiometer terminals. Communication with the DS2890 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 DS2890 devices can reside on a common 1-Wire bus and be operated independently of each other. Each DS2890 has its own unalterable 64-bit ROM registration number that is factory lasered into the chip. The registration number guarantees unique identification for absolute traceability and is used to address the device in a multi-drop 1-Wire Network environment. Applications Commercial lighting control 1-Wire Network instrumentation Gain/offset adjustment Battery charging HVAC control D/A functions DS9502/DS9503 ESD Protection Diodes Features: Zener characteristic with voltage snap-back to protect against ESD hits High avalanche voltage, low leakage and low capacitance avoid signal attenuation Compatible to all 5V families On-chip 5-ohm resistors (DS9503) for isolation at both anode and cathode terminals -45°C to +85°C operating range 6-pin TSOC, CSP The DS9502 and DS9503 ESD Protection Diodes are designed as ESD protection devices for 1-Wire interfaces. Incorporating one of these devices into the 1-Wire interface design will produce an ESD protection level of >25kV. The DS9503 incorporates two 5-ohm isolation resistors on chip for additional protection in the case of an ESD event. During normal operation the devices behave like 7.5V Zener diodes. When the applied voltage exceeds the trigger voltage, the I/V characteristic of the devices will "snapback" allowing the same or higher amount of current to flow, but at a significantly lower voltage. As long as a minimum current or voltage is maintained, the device will stay in the "snapback mode." If the voltage or the current falls below the holding voltage or holding current, the device will abruptly change to its normal mode and conduct only a small leakage current. Applications Handhelds with 1-Wire interfaces Medical products with 1-Wire devices 1-Wire networks PC port adapters UniqueWareTM Devices Features: 1-Wire EPROM is factory programmed and serialized according to customer-supplied information and then write-protected Dallas Semiconductor handles serialization and bookkeeping for tracking the last number used Up to 121 bytes of user-defined information, including serialization Customer-specific project ID number together with custom ROM for highest level of product security Programmed devices are made available only to the owner of the project ID or their authorized agents Minimum order size of 1,000 pieces; no NRE charge, short lead time Wide operating voltage range (2.8V to 6.0V) and industrial temperature range (-40°C to +85°C) Available as DS2502-UNW, DS2505-UNW and DS2506-UNW Silicon Label and DS1982U, DS1985U and DS1986U UniqueWare iButton Applications: After-market protection of products by restricted availability Node ID chip for network cards (IEEE-assigned number) Wireless phone ID plus battery information Electronic product identification label with serialization Packages for Silicon Labels: TO-92 8-pin 150 mil SOIC 6-pin TSOC surface mount package Packages for iButtons: F30 MicroCan F50 MicroCan Additional information: UniqueWare software options and data structure: Application Note 99, "UniqueWare Project Setup Manual" UniqueWare Project Setup Software is available from our FTP Site at ftp://ftp.dalsemi.com/pub/auto_id/, file name unwsetup.exe.

Updated 2000/08/11 Problems or comments?

Copyright © 2001 Dallas Semiconductor Corp.