Document Outline

• PIN ASSIGNMENT
• PIN DESCRIPTION
• D
• DESCRIPTION
  • • SYMBOL
• OVERVIEW
• DS18S20 BLOCK DIAGRAM Figure 1
• OPERATION – MEASURING TEMPERATURE
• TEMPERATURE REGISTER FORMAT Figure 2
• TEMPERATURE/DATA RELATIONSHIP Table 2
  • • • • • • DIGITAL OUTPUT
    • DIGITAL OUTPUT
• OPERATION – ALARM SIGNALING
• TH AND TL REGISTER FORMAT Figure 3
• POWERING THE DS18S20
• SUPPLYING THE PARASITE-POWERED DS18S20 DURING TEMPERATURE CONVERSIONS Figure 4
• POWERING THE DS18S20 WITH AN EXTERNAL SUPPLY Figure 5
• 64-BIT LASERED ROM CODE
• 64-BIT LASERED ROM CODE Figure 6
• MEMORY
• DS18S20 MEMORY MAP Figure 7
  • • • • • SCRATCHPAD (Power-up State)
• CRC GENERATION
• CRC GENERATOR Figure 8
• 1-WIRE BUS SYSTEM
• HARDWARE CONFIGURATION
• HARDWARE CONFIGURATION Figure 9
• TRANSACTION SEQUENCE
• INITIALIZATION
• ROM COMMANDS
• SEARCH ROM [F0h]
• READ ROM [33h]
• MATCH ROM [55h]
• SKIP ROM [CCh]
• ALARM SEARCH [ECh]
• DS18S20 FUNCTION COMMANDS
• CONVERT T [44h]
• WRITE SCRATCHPAD [4Eh]
• READ SCRATCHPAD [BEh]
• COPY SCRATCHPAD [48h]
• RECALL E2 [B8h]
• READ POWER SUPPLY [B4h]
• DS18S20 FUNCTION COMMAND SET Table 4
  • • • • • • • MEMORY COMMANDS
• NOTES:
• 1-WIRE SIGNALING
• INITIALIZATION PROCEDURE: RESET AND PRESENCE PULSES
• INITIALIZATION TIMING Figure 10
• READ/WRITE TIME SLOTS
• WRITE TIME SLOTS
• READ TIME SLOTS
• READ/WRITE TIME SLOT TIMING DIAGRAM Figure 11
• DETAILED MASTER READ 1 TIMING Figure 12
• RECOMMENDED MASTER READ 1 TIMING Figure 13
• ROM COMMANDS FLOW CHART Figure 14
• DS18S20 FUNCTION COMMANDS FLOW CHART Figure 15
• DS18S20 OPERATION EXAMPLE 1
• DS18S20 OPERATION EXAMPLE 1
• DS18S20 OPERATION EXAMPLE 2
• DS18S20 OPERATION EXAMPLE 3
• RELATED APPLICATION NOTES
• ABSOLUTE MAXIMUM RATINGS*
• DC ELECTRICAL CHARACTERISTICS (-55˚C to +125˚C; VDD=3.0V to 5.5V)
  • • PARAMETER
      • • • • SYMBOL
          • Local Power
          • Local Power
          • Local Power
          • Parasite Power
• NOTES:
• AC ELECTRICAL CHARACTERISTICS: NV MEMORY
• (-55˚C to +100˚C; VDD=3.0V to 5.5V)
  • • • • • • SYMBOL
          • -55˚C to +55˚C
          • -55˚C to +55˚C
• AC ELECTRICAL CHARACTERISTICS (-55˚C to +125˚C; VDD=3.0V to 5.5V)
  • • PARAMETER
      • • • • SYMBOL
• TYPICAL PERFORMANCE CURVE Figure 16
• TIMING DIAGRAMS Figure 17