DS1986 Ver la hoja de datos (PDF) - Maxim Integrated

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Fabricante

DS1986

64Kb Add-Only iButton®

Maxim Integrated 

HIERARCHICAL STRUCTURE FOR 1-WIRE PROTOCOL Figure 2

BUS

MASTER

1-WIRE BUS

DS1986

OTHER

DEVICES

COMMAND

LEVEL:

1-WIRE ROM FUNCTION

COMMANDS (SEE FIGURE 9)

DS1986

AVAILABLE

COMMANDS:

DATA FIELD

AFFECTED:

READ ROM

MATCH ROM

SEARCH ROM

SKIP ROM

OVERDRIVE SKIP ROM

OVERDRIVE MATCH ROM

64-BIT ROM

64-BIT ROM

64-BIT ROM

N/A

N/A

64-BIT ROM

DS1986 - SPECIFIC

MEMORY FUNCTION

COMMANDS

(SEE FIGURE 6)

WRITE MEMORY

WRITE STATUS

READ MEMORY

READ STATUS

EXTENDED READ DATA

64K BIT EPROM

EPROM STATUS BYTES

64K BIT EPROM

EPROM STATUS BYTES

64K BIT EPROM

64-BIT LASERED ROM Figure 3

8- Bit CRC Code

48- Bit Serial Number

8- Bit Family Code (0FH)

MSB

LSB MSB

LSB MSB

LSB

65536-BITS EPROM

The memory map in Figure 4 shows the 65536-bit EPROM section of the DS1986 that is configured as

256 pages of 32 bytes each. The 8-bit scratchpad is an additional register that acts as a buffer when

programming the memory. Data is first written to the scratchpad and then verified by reading a 16-bit

CRC from the DS1986 that confirms proper receipt of the data and address. If the buffer contents are

correct, a programming voltage should be applied and the byte of data will be written into the selected

address in memory. This process ensures data integrity when programming the memory. The details for

reading and programming the 65536-bit EPROM portion of the DS1986 are given in the Memory

Function Commands section.

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