Rainbow-electronics DS1996 Bedienungsanleitung

1 of 18 91099SPECIAL FEATURES§ 65536 bits of read/write nonvolatile memory§ Overdrive mode boosts communicationspeed to 142k bits per second§ 256-b

DS199610 of 18for more than 16 µs (Overdrive Speed) or more than 120 µs (regular speed), one or more of the deviceson the bus may be reset.HARDWARE CO

DS199611 of 18Match ROM [55H]The match ROM command, followed by a 64-bit ROM sequence, allows the bus master to address aspecific DS1996 on a multidro

DS199612 of 181-WIRE SIGNALINGThe DS1996 requires strict protocols to ensure data integrity. The protocol consists of four types ofsignaling on one li

DS199613 of 18ROM FUNCTIONS FLOW CHART Figure 91) TO BE TRANSMITTED OR RECEIVED AT OVERDRIVE SPEED IF OD=12) THE PRESENCE PULSE WILL BE S

DS199614 of 18ROM FUNCTIONS FLOW CHART Figure 9 (cont’d)3) ALWAYS TO BE TRANSMITTED AT OVERDRIVE SPEED

DS199615 of 18INITIALIZATION PROCEDURE “RESET AND PRESENCE PULSES” Figure 10Regular Speed Overdrive Speed480 µs ≤ tRSTL < ∞ * 48 µs ≤ tRSTL < 80

DS199616 of 18READ/WRITE TIMING DIAGRAM Figure 11 (cont’d)Write-Zero Time SlotRegular Speed Overdrive Speed60 µs ≤ tLOW0 < tSLOT < 120 µ

DS199617 of 18PHYSICAL SPECIFICATIONSSize See mechanical drawingWeight 3.3 grams (F5 package)Humidity 90% RH at 50°CAltitude 10,000 feetExpected Servi

DS199618 of 18AC ELECTRICAL CHARACTERISTICS OVERDRIVE SPEED (-40°C to 70°C)PARAMETER SYMBOL MIN TYP MAX UNITS NOTESTime Slot tSLOT6 16 µsWrite 1 Low T

DS19962 of 18iButton DESCRIPTIONThe DS1996 Memory iButton is a rugged read/write data carrier that acts as a localized database that canbe easily acce

DS19963 of 18DS1996 BLOCK DIAGRAM Figure 1

DS19964 of 18HIERARCHICAL STRUCTURE FOR 1-WIRE PROTOCOL Figure 264-BIT LASERED ROM Figure 38-Bit CRC Code 48-Bit Serial Number 8-Bit Family Code (0CH)

DS19965 of 18MEMORYThe memory map in Figure 5 shows a 32-byte page called the scratchpad and additional 32-byte pagescalled memory. The DS1996 contain

DS19966 of 18Write Scratchpad Command [0FH]After issuing the write scratchpad command, the master must first provide the 2-byte target address,followe

DS19967 of 18MEMORY FUNCTION FLOW CHART Figure 71) TO BE TRANSMITTED OR RECEIVED AT OVERDRIVE SPEED IF OD=12) RESET PULSE TO BE TRANSMITTED AT OVERD

DS19968 of 18MEMORY FUNCTION EXAMPLESExample: Write two data bytes to memory locations 0026h and 0027h (the seventh and eighth bytes ofpage 1). Read e

DS19969 of 18Copy Scratchpad [55H]This command is used to copy data from the scratchpad to memory. After issuing the copy scratchpadcommand, the maste