m Y Y o W c W . Z Z Z n DS1990A Serial Number iButton General Description Features The DS1990A serial number iButton is a rugged data Can Be Read in Less Than 5ms carrier that serves as an electronic registration number Operating Range: 2.8V to 6.0V, -40C to +85C for automatic identification. Data is transferred serially through the 1-Wire protocol, which requires only a sin- Common iButton Features gle data lead and a ground return. Every DS1990A is factory lasered with a guaranteed unique 64-bit regis- Unique Factory-Lasered 64-Bit Registration tration number that allows for absolute traceability. The Number Ensures Error-Free Device Selection and durable stainless-steel iButton package is highly resis- Absolute Traceability Because No Two Parts are tant to environmental hazards such as dirt, moisture, Alike and shock. Its compact coin-shaped profile is self- aligning with mating receptacles, allowing the DS1990A Built-In Multidrop Controller for 1-Wire Net to be used easily by human operators. Accessories Digital Identification by Momentary Contact enable the DS1990A iButton to be mounted on almost any object, including containers, pallets, and bags. Data Can Be Accessed While Affixed to Object Economically Communicates to Bus Master with Applications a Single Digital Signal at 16.3kbps Access Control Button Shape is Self-Aligning with Cup-Shaped Work-In-Progress Tracking Probes Tool Management Durable Stainless-Steel Case Engraved with Inventory Control Registration Number Withstands Harsh Environments Ordering Information Ordering Information Easily Affixed with Self-Stick Adhesive Backing, Latched by its Flange, or Locked with a Ring PART TEMP RANGE PIN-PACKAGE Pressed Onto its Rim DS1990A-F5+ -40C to +85C F5 iButton DS1990A-F3+ -40C to +85C F3 iButton Pin Configurations +Denotes a lead(Pb)-free/RoHS-compliant package. Functional Diagrams F3 SIZE F5 SIZE Examples of Accessories 3.10mm 5.89mm 0.51mm 0.51mm BRANDING PART ACCESSORY DS9096P Self-Stick Adhesive Pad 16.25mm DS9101 Multipurpose Clip DS9093RA Mounting Lock Ring 89 01 DS9093A Snap-In Fob 000000FBC52B 1-Wire DS9092 iButton Probe 17.35mm IO IO GND GND iButton and 1-Wire are registered trademarks of Maxim Pin Configurations appear at end of data sheet. Integrated Products, Inc. Functional Diagrams continued at end of data sheet. UCSP is a trademark of Maxim Integrated Products, Inc. For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642, or visit Maxims website at www.maxim integrated.com. Rev: 10/08 D AVAILABLE S o 1 t 9 9 t 0 u A + B F 5 iDS1990A Serial Number iButton ABSOLUTE MAXIMUM RATINGS IO Voltage Range to GND.....................................-0.5V to +6.0V Junction Temperature......................................................+125C IO Sink Current....................................................................20mA Storage Temperature Range .............................-55C to +125C Stresses beyond those listed under Absolute Maximum Ratings may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability. ELECTRICAL CHARACTERISTICS (T = -40C to +85C.) A PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS IO PIN: GENERAL DATA 1-Wire Pullup Voltage V (Notes 1, 2) 2.8 6.0 V PUP 1-Wire Pullup Resistance R (Notes 3, 4) 0.6 5 k PUP Input Capacitance C (Notes 5, 6) 100 800 pF IO Input Load Current I (Note 7) 0.25 A L Input Low Voltage V (Notes 1, 3, 8) 0.3 V IL Input High Voltage V (Notes 1, 9) 2.2 V IH Output Low Voltage at 4mA V (Note 1) 0.4 V OL Operating Charge Q (Notes 6, 10) 30 nC OP Recovery Time t (Note 3) 1 s REC Time Slot Duration t (Note 3) 61 s SLOT IO PIN: 1-Wire RESET, PRESENCE-DETECT CYCLE Reset Low Time t (Notes 3, 11) 480 s RSTL Reset High Time t (Notes 3, 12) 480 s RSTH Presence-Detect High Time t 15 60 s PDH Presence-Detect Low Time t (Note 13) 60 240 s PDL Presence-Detect Sample Time t (Note 3) 60 75 s MSP IO PIN: 1-Wire WRITE Write-Zero Low Time t (Notes 3, 14) 60 120 s W0L Write-One Low Time t (Notes 3, 14) 1 15 s W1L IO PIN: 1-Wire READ Read Low Time t (Notes 3, 15) 1 15 - s RL Read Sample Time t (Notes 3, 15) t + 15 s MSR RL Note 1: All voltages are referenced to ground. Note 2: External pullup voltage. See Figure 4. Note 3: System requirement. Note 4: Full R range is guaranteed by design and simulation and not production tested. Production testing performed at a PUP fixed R value. Maximum allowable pullup resistance is a function of the number of 1-Wire devices in the system and 1- PUP Wire recovery times. The specified value here applies to systems with only one device and with the minimum 1-Wire recov- ery times. For more heavily loaded systems, an active pullup such as that found in the DS2480B may be required. Note 5: Capacitance on the IO pin could be 800pF when power is first applied. If a 5k resistor is used to pull up the IO line to V , 5s after power has been applied the parasite capacitance will not affect normal communications. PUP Note 6: Guaranteed by design, simulation only. Not production tested. Note 7: Input load is to ground. 2 Maxim Integrated