DS1985 Просмотр технического описания (PDF) - Dallas Semiconductor -> Maxim Integrated

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DS1985

16-kbit Add-Only iButton™

Dallas Semiconductor -> Maxim Integrated 

DS1985

(Figure 11) should be applied for 480 µs, after which the bus master returns the data line to an idle high

state controlled by the pullup resistor. Note that due to the high voltage programming requirements for

any 1-Wire EPROM device, it is not possible to multidrop non-EPROM based 1-Wire devices with the

DS1985 during programming. An internal diode within the non-EPROM based 1-Wire devices will

attempt to clamp the data line at approximately 8 volts and could potentially damage these devices.

INITIALIZATION PROCEDURE “RESET AND PRESENCE PULSES” Figure 9

RESISTOR

MASTER

DS1985

480 µs ≤ tRSTL < ∞ *

480 µs ≤ tRSTH < ∞ (includes recovery time)

15 µs ≤ tPDH < 60 µs

60 µs ≤ tPDL < 240 µs

∗ In order not to mask interrupt signaling by other devices on the 1-Wire bus, tRSTL + tR should always

be less than 960 µs.

READ/WRITE TIMING DIAGRAM Figure 10

Write-1 Time Slot

RESISTOR

MASTER

60 µs ≤ tSLOT < 120 µs

1 µs ≤ tLOW1 < 15 µs

1 µs ≤ tREC < ∞

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