Rainbow-electronics DS2890 Manual de usuario descargar pdf (Pagina 19)

DS2890

19 of 28

FIGURE 19. INITIALIZATION PROCEDURE “RESET AND PRESENCE

PULSES”

RESISTOR

MASTER

DS2890

MASTER RX "PRESENCE PULSE"

REGULAR SPEED OVERDRIVE SPEED

480 µs

RSTL

480 µs

RSTH

15 µs

PDH

< 60 µs

PDL

< 240 µs

48 µs

RSTL

< 80 µs

48 µs

RSTH

2 µs

PDH

< 6 µs

PDL

< 24 µs

MASTER TX

"RESET PULSE"

PULLUP

PULLUP MIN

IH MIN

IL MAX

RSTH

RSTL

PDH

PDL

* In order not to mask interrupt signaling by other devices on the 1-Wire bus and to prevent a power-

on reset of the parasite powered circuit, t

RSTL

+ t

should always be less than 960 µs.

** Includes recovery time.

FIGURE 20. READ/WRITE TIMING DIAGRAMS

a) Write-one Time Slot

15µs

(OD: 2µs)

60µs

(OD: 6µs)

DS2890

Sampling Window

PULLUP

PULLUP MIN

IH MIN

IL MAX

SLOT

REC

LOW1

REGULAR SPEED OVERDRIVE SPEED

60 µs

SLOT

< 120 µs

1 µs

LOW1

< 15 µs

6 µs

SLOT

< 16 µs

1 µs

LOW1

< 2 µs

1 µs

REC

1 µs

REC

RESISTOR

MASTER

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Rainbow-electronics DS2890 Manual de usuario Pagina 19

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