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DS28E05 Datasheet(PDF) 5 Page - Maxim Integrated Products |
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DS28E05 Datasheet(HTML) 5 Page - Maxim Integrated Products |
5 / 17 page DS28E05 1-Wire EEPROM www.maximintegrated.com Maxim Integrated │ 5 Figure 1. Block Diagram Figure 2. Hierarchical Structure for 1-Wire Protocol Figure 3. 64-Bit ROM ID ThepolynomialisX8+X5+X4+1.Additionalinformation aboutthe1-WireCyclicRedundancyCheckisavailable in ApplicationNote27:Understanding and Using Cyclic Redundancy Checks with Maxim iButton® Products. The shift register bits are initialized to 0. Then, starting withtheleastsignificantbitofthefamilycode,onebitat atimeisshiftedin.Afterthe8thbitofthefamilycodehas beenentered,theserialnumberisentered.Afterthelast bitoftheserialnumberhasbeenentered,theshiftreg- istercontainstheCRCvalue.Shiftinginthe8bitsofthe CRCreturnstheshiftregistertoall0s. iButton is a registered trademark of Maxim Integrated Products, Inc. DS28E05 1-Wire FUNCTION CONTROL 1-Wire NET PARASITE POWER 64-BIT ROM ID ADMINISTRATIVE DATA (64 BITS) USER EEPROM 7 PAGES OF (128 BITS EACH) MEMORY FUNCTION CONTROL AVAILABLE COMMANDS: DATA FIELD AFFECTED: READ ROM MATCH ROM SEARCH ROM SKIP ROM RESUME 64-BIT ROM ID, RC-FLAG 64-BIT ROM ID, RC-FLAG 64-BIT ROM ID, RC-FLAG RC-FLAG RC-FLAG 1-Wire ROM FUNCTION COMMANDS WRITE MEMORY READ MEMORY USER MEMORY, ADMINISTRATIVE DATA USER MEMORY, ADMINISTRATIVE DATA DS28E05-SPECIFIC MEMORY FUNCTION COMMANDS COMMAND LEVEL: DS28E05 MSb 8-BIT CRC CODE 48-BIT SERIAL NUMBER MSb LSb MSb LSb LSb 8-BIT FAMILY CODE (0Dh) MSb LSb |
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