Rainbow-electronics DS2409 Manual de usuario

1 of 18 111901FEATURES§ Low impedance coupler to create largecommon-ground, multi-level MicroLANnetworks§ Keeps inactive branches pulled high to 5V§

DS240910 of 18ROM FUNCTION COMMANDSOnce the bus master has detected a presence, it can issue one of the five ROM function commands. AllROM function co

DS240911 of 18ROM FUNCTIONS FLOW CHART Figure 7

DS240912 of 181-WIRE SIGNALINGThe DS2409 requires strict protocols to ensure data integrity. The protocol consists of four types ofsignaling on one li

DS240913 of 18READ/WRITE TIMING DIAGRAM Figure 9

DS240914 of 18USAGE EXAMPLEConfiguration: A bus master controls a MicroLAN consisting of a trunk with many DS2409s that createbranches. Each of the D

DS240915 of 18APPLICATION EXAMPLESFigures 10 and 11 show two application examples of the DS2409 MicroLAN Coupler. A single trunkwith branches is the t

DS240916 of 18DUAL MASTER SYSTEM Figure 11

DS240917 of 18ABSOLUTE MAXIMUM RATINGS*Voltage on Data to Ground -0.5V to +7.0VOperating Temperature Range -40°C to +85°CStorage Temperature Range -55

DS240918 of 18AC ELECTRICAL CHARACTERISTICS (-40°C to +85°C, VDD = 5V ±10%)PARAMETER SYMBOL MIN TYP MAX UNITS NOTESTime Slot tSLOT60 120 µsWrite 1 Low

DS24092 of 18remaining deselected. This significantly speeds up the analysis of topology and population in acontinuously changing network. The coupler

DS24093 of 1864-BIT LASERED ROMEach DS2409 contains a unique ROM code that is 64 bits long. The first eight bits are a 1-Wire familycode. The next 48

DS24094 of 181-WIRE CRC GENERATOR Figure 4CONTROL FUNCTION COMMANDSThe “Control Function Flow Chart” (Figure 5) describes the protocols necessary for

DS24095 of 18STATUS CONTROL BYTE Table 176543210DATAXCNTR.SEL.MODER/ W R/ WXXX0-2X don’t care3-4R/ WWrite control: both bits must be 0 to change the s

DS24096 of 18DISCHARGE LINES [99h]There may be situations where one has to force a power-on reset for parasitically powered 1-Wire devicesconnected to

DS24097 of 18FUNCTION COMMAND FLOW CHART Figure 5

DS24098 of 18FUNCTION COMMAND FLOW CHART Figure 5 (cont’d)

DS24099 of 18HARDWARE CONFIGURATION Figure 61-WIRE BUS SYSTEMThe 1-Wire bus is a system which has a single bus master and one or more slaves. In all i