Rainbow-electronics DS1904 Manual do Utilizador descarregar pdf (Página 3)

DS1904

3 of 12

HIERARCHICAL STRUCTURE FOR 1-WIRE PROTOCOL Figure 2

DS1904

Command

Level

vailable

Commands

Data Fields

ffected

1-Wire Bus

Other

Devices

Bus

Master

DS1904

Function

(

see Fi

ure

Write

Read

RTC Counter

Device

RTC Counter

Device

Read

Match

Ski

64-bit

1-Wire ROM

Commands

(

see Fi

ure

64-BIT LASERED ROM Figure 3

MSB LSB

8-Bit CRC Code 48-Bit Serial Number 8-Bit Family Code (24h)

MSB LSB MSB LSB MSB LSB

1-WIRE CRC GENERATOR Figure 4

8TH

STAGE

7TH

STAGE

6TH

STAGE

5TH

STAGE

4TH

STAGE

3RD

STAGE

2ND

STAGE

1ST

STAGE

INPUT DATA

Polynomial = X

+ X

+ 1

1 2 3 4 5 6 7 8 ... 11 12

RTC iButton 1
OVERVIEW 2
BLOCK DIAGRAM Figure 1 2
64-BIT LASERED ROM 2
64-BIT LASERED ROM Figure 3 3
1-WIRE CRC GENERATOR Figure 4 3
TIMEKEEPING 4
DEVICE CONTROL BYTE 4
REAL-TIME CLOCK 4
CLOCK FUNCTION COMMANDS 4
READ CLOCK [66h] 6
WRITE CLOCK [99h] 6
1-WIRE BUS SYSTEM 6
Hardware Configuration 6
Skip ROM [CCh] 9
1–WIRE SIGNALING 9
READ/WRITE TIME SLOTS 9
Write-one Time Slot 10
Write-zero Time Slot 10
Read-data Time Slot 10
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12 of 12 12

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