Rainbow-electronics DS2430A Manual do Utilizador

1 of 16 022002FEATURES§ 256-bit Electrically Erasable ProgrammableRead Only Memory (EEPROM) plus 64-bitone-time programmable application register§ U

DS2430A10 of 16ROM FUNCTIONS FLOW CHART Figure 8

DS2430A11 of 16Transaction SequenceThe sequence for accessing the DS2430A via the 1-Wire port is as follows:§ Initialization§ ROM Function Command§

DS2430A12 of 16After one complete pass, the bus master knows the contents of the ROM in one device. The remainingnumber of devices and their ROM codes

DS2430A13 of 16READ/WRITE TIMING DIAGRAM Figure 10Write-0 Time SlotWrite-1 Time SlotRead-data Time Slot

DS2430A14 of 16MEMORY FUNCTION EXAMPLEExample: Write 2 data bytes to data memory location 0006 and 0007. Read entire data memory.MASTER MODE DATA (LSB

DS2430A15 of 16ABSOLUTE MAXIMUM RATINGS*Voltage on DATA to Ground -0.5V to +7.0VOperating Temperature Range -40°C to +85°CStorage Temperature Range -5

DS2430A16 of 16NOTES:1) All voltages are referenced to ground.2) VPUP = external pullup voltage.3) Input load is to ground.4) An additional reset

DS2430A2 of 16SILICON LABEL DESCRIPTIONThe DS2430A 256-bit 1-Wire EEPROM identifies and stores relevant information about the product towhich it is as

DS2430A3 of 16DS2430A BLOCK DIAGRAM Figure 1

DS2430A4 of 16HIERARCHICAL STRUCTURE FOR 1-WIRE PROTOCOL Figure 264-BIT LASERED ROM Figure 38-Bit CRC Code 48-Bit Serial Number 8-Bit Family Code (14H

DS2430A5 of 16MEMORYThe memory of the DS2430A consists of three separate sections, called data memory, applicationregister, and status register (Figur

DS2430A6 of 16MEMORY FUNCTION FLOW CHART Figure 6COPY SCRATCHPAD [55h]After the data stored in the scratchpad has been verified the master may send th

DS2430A7 of 16MEMORY FUNCTION FLOW CHART Figure 6 (cont’d)WRITE APPLICATION REGISTER [99h]This command is essentially the same as the Write Scratchpad

DS2430A8 of 16MEMORY FUNCTION FLOW CHART Figure 6 (cont’d)READ APPLICATION REGISTER [C3h]This command is used to read the application register or the

DS2430A9 of 161-WIRE BUS SYSTEMThe 1-Wire bus is a system that has a single bus master and one or more slaves. In all instances, theDS2430A is a slave