Rainbow-electronics DS2502 Uživatelský manuál

1 of 22 102199FEATURES§ 1024 bits Electrically Programmable ReadOnly Memory (EPROM) communicates withthe economy of one signal plus ground§ Unique,

DS250210 of 22 102199READ MEMORY [F0H]The Read Memory command is used to read data from the 1024-bit EPROM data field. The bus masterfollows the comma

DS250211 of 22 102199address and continuing until the end of a 32-byte page is reached. At that point the bus master will sendeight additional read ti

DS250212 of 22 102199significant byte of the new two-byte address will also be loaded into the 8-bit CRC generator as a startingvalue. The bus master

DS250213 of 22 102199contains 0s in the same bit positions as the data byte, the programming was successful and the DS2502will automatically increment

DS250214 of 22 102199A multidrop bus consists of a 1-Wire bus with multiple slaves attached. At regular speed the 1-Wire bushas a maximum data rate of

DS250215 of 22 102199DS2502 EQUIVALENT CIRCUIT Figure 7BUS MASTER CIRCUIT Figure 8

DS250216 of 22 102199ROM FUNCTIONS FLOW CHART Figure 9

DS250217 of 22 102199Skip ROM [CCH]This command can save time in a single-drop bus system by allowing the bus master to access thememory functions wit

DS250218 of 22 102199CRC GENERATIONThe DS2502 has an 8-bit CRC stored in the most significant byte of the 64-bit ROM. The bus master cancompute a CRC

DS250219 of 22 102199READ/WRITE TIMING DIAGRAM Figure 11Write-one Time Slot60 µs ≤ tSLOT < 120 µs1 µs ≤ tLOW1 < 15 µs1 µs ≤ tREC < ∞Write-zer

DS25022 of 22 102199SILICON LABEL DESCRIPTIONThe DS2502 1 kbit Add-Only Memory identifies and stores relevant information about the product towhich it

DS250220 of 22 102199PROGRAM PULSE TIMING DIAGRAM Figure 12

DS250221 of 22 102199ABSOLUTE MAXIMUM RATINGS*Voltage on any Pin Relative to Ground -0.5V to +12.0VOperating Temperature -40°C to +85°CStorage Tempera

DS250222 of 22 102199NOTES:1. All voltages are referenced to ground.2. VPUP = external pullup voltage.3. Input load is to ground.4. An additional

DS25023 of 22 102199follow the 1-Wire protocol detailed in the section “1-Wire Bus System.” The memory functions requiredto read and program the EPROM

DS25024 of 22 102199HIERARCHICAL STRUCTURE FOR 1-WIRE PROTOCOL Figure 264-BIT LASERED ROM Figure 38–Bit CRC Code 48–Bit Serial Number 8–Bit Family Cod

DS25025 of 22 1021991024-BITS EPROMThe memory map in Figure 5 shows the 1024-bit EPROM section of the DS2502 which is configured asfour pages of 32 by

DS25026 of 22 102199or written. Writing data involves not only issuing the correct command sequence by also providing a 12-volt programming voltage at

DS25027 of 22 102199MEMORY FUNCTION FLOW CHART Figure 6

DS25028 of 22 102199MEMORY FUNCTION FLOW CHART Figure 6 (cont’d)LEGEND:DECISION MADEBY THE MASTERDECISION MADEBYDS2502

DS25029 of 22 102199MEMORY FUNCTION FLOW CHART Figure 6 (cont’d)