Rainbow-electronics DS2506 Manuel d'utilisateur

1 of 25 062100FEATURES 65536 bits Electrically Programmable ReadOnly Memory (EPROM) communicates withthe economy of one signal plus ground Unique,

DS250610 of 25MEMORY FUNCTION FLOW CHART Figure 5 (cont’d)

DS250611 of 25After the 16-bit CRC of the last EPROM Status data page is read, the bus master will receive logical 1sfrom the DS2506 until a Reset Pul

DS250612 of 25passes through the Extended Read Memory flow chart will generate a 16-bit CRC that is the result ofclearing the CRC generator and then s

DS250613 of 25a program pulse is applied by the bus master, incorrect programming could occur within the DS2506.Also note that the DS2506 will always

DS250614 of 25Hardware ConfigurationThe 1-Wire bus has only a single line by definition; it is important that each device on the bus be able todrive i

DS250615 of 25Read ROM [33H]This command allows the bus master to read the DS2506’s 8-bit family code, unique 48-bit serialnumber, and 8-bit CRC. This

DS250616 of 25DS2506 EQUIVALENT CIRCUIT Figure 6BUS MASTER CIRCUIT Figure 7

DS250617 of 25ROM FUNCTIONS FLOW CHART Figure 8

DS250618 of 25ROM FUNCTIONS FLOW CHART Figure 8 (cont’d)

DS250619 of 25Overdrive Skip ROM [3CH]On a single-drop bus this command can save time by allowing the bus master to access the memoryfunctions without

DS25062 of 25SILICON LABEL DESCRIPTIONThe DS2506 64 kbits Add-Only Memory identifies and stores relevant information about the product towhich it is a

DS250620 of 25determines how long the DS2506 will hold the data line low overriding the 1 generated by the master. Ifthe data bit is a “1”, the device

DS250621 of 25READ/WRITE TIMING DIAGRAM Figure 10 (cont’d)Write-zero Time SlotRead-data Time SlotNOTE:For read-data time slots the optimal sampling po

DS250622 of 25PROGRAM PULSE TIMING DIAGRAM Figure 11CRC GENERATIONWith the DS2506 there are two different types of CRCs (Cyclic Redundancy Checks). On

DS250623 of 25When reading the data memory of the DS2506 with the Extended Read Memory command, there are twosituations where a 16-bit CRC is transmit

DS250624 of 25ABSOLUTE MAXIMUM RATINGS*Voltage on any Pin Relative to Ground -0.5V to +12.0VOperating Temperature -40°C to +85°CStorage Temperature -5

DS250625 of 25AC ELECTRICAL CHARACTERISTICS OVERDRIVE SPEED(VPUP=2.8V to 6.0V; -40°C to 70°C)PARAMETER SYMBOL MIN TYP MAX UNITS NOTESTime Slot tSLOT61

DS25063 of 25follow the 1-Wire protocol detailed in the section “1-Wire Bus System.” The memory functions requiredto read and program the EPROM sectio

DS25064 of 25HIERARCHICAL STRUCTURE FOR 1-WIRE PROTOCOL Figure 264-BIT LASERED ROM Figure 38-Bit CRC Code 48-Bit Serial Number 8-Bit Family Code (0FH)

DS25065 of 25The next 32 bytes of the EPROM Status Memory (addresses 020 to 03FH) contain the Write Protect bitswhich inhibit altering the Page Addres

DS25066 of 25DS2506 MEMORY MAP Figure 4STATUS MEMORY MAP

DS25067 of 25MEMORY FUNCTION COMMANDSThe “Memory Function Flow Chart” (Figure 5) describes the protocols necessary for accessing thevarious data field

DS25068 of 25Note that the initial pass through the Read Status flow chart will generate a 16-bit CRC value that is theresult of clearing the CRC gene

DS25069 of 25MEMORY FUNCTION FLOW CHART Figure 5 (cont’d)