DS1990A Serial Number Magnetic Ibutton Key Fob with Holder
The DS1990A Serial Number iButton is a rugged data carrier that acts as an electronic registration number for automatic identification. The DS1990A consists of a factory-lasered, 64-bit ROM that includes an 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 aground return. The DS1990A is fully compatible with the DS1990 Serial Number iButton but provides the addi-tional 1-Wire protocol capability that allows the Search ROM command to be interpreted by the DS1990A and therefore allows multiple DS1990A devices to reside on a single data line.
DS1990A SPECIAL FEATURES
•Upgrade of DS1990 allows multiple Serial Number
iButtons to reside on a common bus
•Unique 48-bit serial number
•Low-cost electronic key for access control
•8-bit CRC for checking data integrity
•Can be read in less than 5 ms
•Operating temperature range of -40°C to +85°C
| Mfg Application Notes |
Using a UART to Implement a 1-Wire Bus Master |
| Understanding and Using Cyclic Redundancy Checks with Maxim 1-Wire and iButton Products |
| Reading and Writing 1-Wire® Devices Through Serial Interfaces |
| 1-Wire Communication Through Software |
| Guidelines for Reliable Long Line 1-Wire Networks |
| 1-Wire Software Resource Guide Device Description |
| Software Methods to Achieve Robust 1-Wire® Communication in iButton® Applications |
| 1-Wire Search Algorithm |
| Using the DS2480B Serial 1-Wire® Line Driver |
| Advanced 1-Wire Network Driver |
| White Paper 2: Using the 1-Wire® Public Domain Kit |
| White Paper 5: Using 1-Wire APIs for Data Sheet Commands |
| What Is an iButton Device? |
| Understanding the DS1WM Synthesizable 1-Wire Bus Master |
| Create a 1-Wire Master with Xilinx PicoBlaze |
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