DS1972-F3 MAXIM [Maxim Integrated Products], DS1972-F3 Datasheet - Page 19

• Manufacturer Part Number: DS1972-F3
• Description: 1024-Bit EEPROM iButton
• Manufacturer: MAXIM [Maxim Integrated Products]

Master-to-Slave
For a write-one time slot, the voltage on the data line must have crossed the V
low time t
threshold until the write-zero low time t
data line should not exceed V
the DS1972 needs a recovery time t
Figure 11. Read/Write Timing Diagram
Write-One Time Slot
Write-Zero Time Slot
Read-Data Time Slot
W1LMAX
V
V
V
IHMASTER
IHMASTER
IHMASTER
V
V
V
V
V
V
ILMAX
ILMAX
ILMAX
V
V
V
V
V
V
PUP
PUP
PUP
0V
0V
0V
is expired. For a write-zero time slot, the voltage on the data line must stay below the V
TH
TH
TH
TL
TL
TL
t
F
t
t
F
F
RESISTOR
RESISTOR
RESISTOR
ILMAX
t
RL
t
W1L
during the entire t
REC
e
d
before it is ready for the next time slot.
W0LMIN
Sampling
Window
is expired. For the most reliable communication, the voltage on the
Master
t
W0L
t
MSR
W0L
19 of 23
MASTER
MASTER
MASTER
or t
t
SLOT
W1L
t
t
SLOT
SLOT
window. After the V
TH
t
REC
TH
DS1972
threshold before the write-one
t
REC
threshold has been crossed,
TH