DS1990R Maxim, DS1990R Datasheet - Page 8

• Manufacturer Part Number: DS1990R
• Description: The DS1990R Serial Number iButton® is a rugged data carrier that serves as an electronic registration number for automatic identification
• Manufacturer: Maxim

Serial Number iButton
Figure 7. Read/Write Timing Diagram
8
_______________________________________________________________________________________
WRITE-ONE TIME SLOT
V
WRITE-ZERO TIME SLOT
V
READ-DATA TIME SLOT
V
IHMASTER
IHMASTER
IHMASTER
V
V
V
V
V
V
ILMAX
ILMAX
ILMAX
IHMIN
IHMIN
IHMIN
V
V
V
PUP
PUP
PUP
0V
0V
0V
t
t
t
F
F
F
t
RL
RESISTOR
RESISTOR
RESISTOR
t
W1L
t
MSR
ε
δ
SAMPLING
WINDOW
MASTER
t
W0L
t
t
t
SLOT
SLOT
MASTER
SLOT
MASTER
MASTER
ε
t
REC
t
REC
DS1990R