DS1994 Просмотр технического описания (PDF) - Maxim Integrated

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производитель

DS1994

4Kb Plus Time Memory iButton®

Maxim Integrated 

DS1994

Figure 10. INITIALIZATION PROCEDURE RESET AND PRESENCE PULSES

VPULLUP

VPULLUP MIN

VIH MIN

MASTER TX

"RESET PULSE"

MASTER RX "PRESENCE PULSE"

tRSTH

VIL MAX

0V

RESISTOR

MASTER

DS1994

tRSTL

tR

tPDH

480µs  tRSTL < *

480µs  tRSTH < **

15µs  tPDH < 60µs

60  tPDL < 240µs

tPDL

* In order not to mask interrup signaling

by other devices on the 1-Wire bus, tRSTL

+ tR should always be less than 960 us.

** Includes recovery time

Figure 11. READ/WRITE TIMING DIAGRAM

Write-One Time Slot

VPULLUP

VPULLUP MIN

VIH MIN

VIL MAX

0V

RESISTOR

MASTER

tSLOT

DS1994

Sampling Window

t LOW1

15µs

60µs

60µs  tSLOT < 120µs

1µs  tLOW1 < 15µs

1µs  tREC < 

tREC

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