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Serial Number iButton
Note 8:
Note 9:
Note 10:
Note 11:
Note 12:
Note 13:
Note 14:
Note 15:
The voltage on IO must be less than or equal to V ILMAX whenever the master drives the line low.
V IH is a function of the internal supply voltage.
30nC per 72 time slots at 5.0V pullup voltage with a 5k Ω pullup resistor and t SLOT ≤ 120μs.
The reset low time (t RSTL ) should be restricted to a maximum of 960μs to allow interrupt signaling. A longer duration could
mask or conceal interrupt pulses if this device is used in parallel with a DS1994.
An additional reset or communication sequence cannot begin until the reset high time has expired.
Presence pulse after POR is guaranteed by design, not production tested.
ε in Figure 7 represents the time required for the pullup circuitry to pull the voltage on IO up from V IL to V IH . The actual
maximum duration for the master to pull the line low is t W1LMAX + t F - ε and t W0LMAX + t F - ε , respectively.
δ in Figure 7 represents the time required for the pullup circuitry to pull the voltage on IO up from V IL to the input-high
threshold of the bus master. The actual maximum duration for the master to pull the line low is t RLMAX + t F .
iButton CAN PHYSICAL SPECIFICATION
SIZE
WEIGHT (DS1990R)
See the Package Information section.
Ca. 2.5 grams
Detailed Description
The block diagram in Figure 1 shows the major function
blocks of the device. The DS1990R takes the energy it
needs to operate from the IO line, as indicated by the
parasite power block. The ROM function control unit
includes the 1-Wire interface and the logic to implement
the ROM function commands, which access 64 bits of
lasered ROM.
PARASITE POWER
DS1990R
Figure 1. Block Diagram
IO
ROM
FUNCTION CONTROL
64-BIT
LASERED ROM
_______________________________________________________________________________________
3
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