Document Outline

• FEATURES
• PIN ASSIGNMENT
• PIN DESCRIPTION
• D
• DESCRIPTION
  • • SYMBOL
• OVERVIEW
• DS1822-PAR BLOCK DIAGRAM Figure 1
• PARASITE POWER
• SUPPLYING THE DS1822-PAR DURING TEMPERATURE CONVERSIONS Figure 2
• OPERATION – MEASURING TEMPERATURE
• TEMPERATURE REGISTER FORMAT Figure 3
• TEMPERATURE/DATA RELATIONSHIP Table 2
  • • • • • • DIGITAL OUTPUT
• OPERATION – ALARM SIGNALING
• TH AND TL REGISTER FORMAT Figure 4
• 64-BIT LASERED ROM CODE
• 64-BIT LASERED ROM CODE Figure 5
• MEMORY
• DS1822-PAR MEMORY MAP Figure 6
  • • • • • SCRATCHPAD (Power-up State)
• CONFIGURATION REGISTER
• Byte 4 of the scratchpad memory contains the configuration register, which is organized as illustrated in Figure 7. The user can set the conversion resolution of the DS1822-PAR using the R0 and R1 bits in this register as shown in Table 3. The power-u
• CONFIGURATION REGISTER Figure 7
• THERMOMETER RESOLUTION CONFIGURATION Table 3
• 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]
• DS1822-PAR FUNCTION COMMANDS
• CONVERT T [44h]
• WRITE SCRATCHPAD [4Eh]
• READ SCRATCHPAD [BEh]
• COPY SCRATCHPAD [48h]
• RECALL E2 [B8h]
• DS1822-PAR FUNCTION COMMAND SET Table 4
  • • • • • TEMPERATURE CONVERSION COMMANDS
            • • MEMORY COMMANDS
• NOTES:
• ROM COMMANDS FLOW CHART Figure 9
• DS1822-PAR FUNCTION COMMANDS FLOW CHART Figure 10
• 1-WIRE SIGNALING
• 1-WIRE SIGNALING
• INITIALIZATION PROCEDURE: RESET AND PRESENCE PULSES
• INITIALIZATION TIMING Figure 11
• READ/WRITE TIME SLOTS
• WRITE TIME SLOTS
• READ/WRITE TIME SLOT TIMING DIAGRAM Figure 12
• READ TIME SLOTS
• DETAILED MASTER READ 1 TIMING Figure 13
• RECOMMENDED MASTER READ 1 TIMING Figure 14
• RELATED APPLICATION NOTES
• DS1822-PAR OPERATION EXAMPLE 1
• DS1822-PAR OPERATION EXAMPLE 2
• ABSOLUTE MAXIMUM RATINGS*
• DC ELECTRICAL CHARACTERISTICS (-55˚C to +100˚C; VPU=3.0V to 5.5V)
  • • PARAMETER
      • • • • SYMBOL
• NOTES:
• AC ELECTRICAL CHARACTERISTICS: NV MEMORY
• (-55˚C to +100˚C; VPU=3.0V to 5.5V)
  • • • • • • SYMBOL
          • -55˚C to +55˚C
          • -55˚C to +55˚C
• AC ELECTRICAL CHARACTERISTICS: (-55˚C to +100˚C; VPU=3.0V to 5.5V)
  • • PARAMETER
      • • • • SYMBOL
• NOTES:
• TYPICAL PERFORMANCE CURVE Figure 15
  • • • “TBA”
• TIMING DIAGRAMS Figure 16