Rainbow-electronics DS2431 Manuel d'utilisateur

1 of 23REV: 050704Note: Some revisions of this device may incorporate deviations from published specifications known as errata. Multiple revisions of

DS2431: 1024-Bit, 1-Wire EEPROM10 of 23Figure 7-2. Memory Function Flow Chart (continued)AAhRead Scratch-Pad ?DS2431 sets ScratchpadByte Counter = T2:

DS2431: 1024-Bit, 1-Wire EEPROM11 of 23Figure 7-3. Memory Function Flow Chart (continued)* 1-Wire idle high for powerFrom Figure 72nd PartTo Figure 72

DS2431: 1024-Bit, 1-Wire EEPROM12 of 23Figure 7-4. Memory Function Flow Chart (continued)F0hRead Memory ?Address< 90h ?YNBus Master TXTA1 (T7:T0),T

DS2431: 1024-Bit, 1-Wire EEPROM13 of 23READ SCRATCHPAD COMMAND [AAh]The Read Scratchpad command allows verifying the target address and the integrity

DS2431: 1024-Bit, 1-Wire EEPROM14 of 23Figure 8. Hardware ConfigurationOpen DrainPort PinRX = RECEIVETX = TRANSMIT100 ΩMOSFETVPUPRXTXTXRXDATARPUP2.2µA

DS2431: 1024-Bit, 1-Wire EEPROM15 of 23SEARCH ROM [F0h]When a system is initially brought up, the bus master might not know the number of devices on t

DS2431: 1024-Bit, 1-Wire EEPROM16 of 23Figure 9-1. ROM Functions Flow ChartFrom Figure 92nd PartTo Memory FunctionsFlow Chart (Figure 7)Master TX Bit

DS2431: 1024-Bit, 1-Wire EEPROM17 of 23Figure 9-2. ROM Functions Flow Chart (continued)To Figure 91st PartFrom Figure 91st PartFrom Figure 91st PartTo

DS2431: 1024-Bit, 1-Wire EEPROM18 of 231-Wire SIGNALINGThe DS2431 requires strict protocols to ensure data integrity. The protocol consists of four ty

DS2431: 1024-Bit, 1-Wire EEPROM19 of 23Master-to-SlaveFor a write-one time slot, the voltage on the data line must have crossed the VTH threshold befo

DS2431: 1024-Bit, 1-Wire EEPROM2 of 23ABSOLUTE MAXIMUM RATINGSI/O Voltage to GND -0.5V, +6VI/O Sink Current 20mAOperating Temperature Range -40°C to +

DS2431: 1024-Bit, 1-Wire EEPROM20 of 23Slave-to-MasterA read-data time slot begins like a write-one time slot. The voltage on the data line must remai

DS2431: 1024-Bit, 1-Wire EEPROM21 of 23CRC GENERATIONWith the DS2431 there are two different types of CRCs. One CRC is an 8-bit type and is stored in

DS2431: 1024-Bit, 1-Wire EEPROM22 of 23COMMAND-SPECIFIC 1-Wire COMMUNICATION PROTOCOL—LEGENDSYMBOL DESCRIPTIONRST 1-Wire Reset Pulse generated by mast

DS2431: 1024-Bit, 1-Wire EEPROM23 of 23Maxim/Dallas Semiconductor cannot assume responsibility for use of any circuitry other than circuitry entirely

DS2431: 1024-Bit, 1-Wire EEPROM3 of 23PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITSI/O PIN, 1-Wire WRITEStandard speed 60 120Write-0 Low Time (Note 1)

DS2431: 1024-Bit, 1-Wire EEPROM4 of 23DESCRIPTIONThe DS2431 combines 1024 bits of EEPROM, an 8-byte register/control page with up to 7 user read/write

DS2431: 1024-Bit, 1-Wire EEPROM5 of 23Figure 2. Hierarchical Structure for 1-Wire Protocol Available Commands: DS2431 Command Level: Data Field Affe

DS2431: 1024-Bit, 1-Wire EEPROM6 of 23Figure 5. Memory MapADDRESS RANGE TYPE DESCRIPTION PROTECTION CODES0000h to 001Fh R/(W) Data Memory Page 00020h

DS2431: 1024-Bit, 1-Wire EEPROM7 of 23The protection control registers determine how incoming data on a write-scratchpad command is loaded into thescr

DS2431: 1024-Bit, 1-Wire EEPROM8 of 23WRITING WITH VERIFICATIONTo write data to the DS2431, the scratchpad has to be used as intermediate storage. Fir

DS2431: 1024-Bit, 1-Wire EEPROM9 of 23Figure 7-1. Memory Function Flow Chart0FhWrite Scratch-pad ?Bus Master TXTA1 (T7:T0), TA2 (T15:T8)YNTo Figure 72