Rainbow-electronics DS2890 Bedienungsanleitung PDF herunterladen (Seite 20)

DS2890

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b) Write-zero Time Slot

15µs

RESISTOR

MASTER

(OD: 2µs)

DS2890

60µs

LOW0

Sampling Window

(OD: 6µs)

REGULAR SPEED

OVERDRIVE SPEED

60 µs

LOW0

< t

SLOT

< 120 µs

1 µs

REC

6 µs

LOW0

< t

SLOT

< 16 µs

1 µs

REC

PULLUP

PULLUP MIN

IH MIN

IL MAX

SLOT

REC

c) Read-data Time Slot

RESISTOR

MASTER

DS2890

Master

Sampling Window

REGULAR SPEED OVERDRIVE SPEED

60 µs

SLOT

< 120 µs

1 µs

LOWR

< 15 µs

RELEASE

< 45 µs

1 µs

REC

RDV

= 15 µs

< 1 µs

6 µs

SLOT

< 16 µs

1 µs

LOWR

< 2 µs

RELEASE

< 4 µs

1 µs

REC

RDV

= 2 µs

< 1 µs

PULLUP

PULLUP MIN

IH MIN

IL MAX

SLOT

REC

LOWR

RDV

RELEASE

*The optimal sampling point for the master is as close as possible to the end time of the t

RDV

period

without exceeding t

RDV

. For the case of a Read-one time slot, this maximizes the amount of time for the

pull-up resistor to recover the line to a high level. For a Read-zero time slot it ensures that a read will

occur before the fastest 1-Wire device(s) release the line (t

RELEASE

= 0).

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