DS1921H-F5# Maxim Integrated Products, DS1921H-F5# Datasheet - Page 31

• Manufacturer Part Number: DS1921H-F5#
• Description: IBUTTON THERMOCHRON F5
• Manufacturer: Maxim Integrated Products
• Series: iButton®r

Specifications of DS1921H-F5#

• Rohs Information: IButton RoHS Compliance Plan
• Memory Size: 512B
• Memory Type: NVSRAM (Non-Volatile SRAM)
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

READ/WRITE TIMING DIAGRAM Figure 15
Write-One Time Slot
Write-Zero Time Slot
Read-Data Time Slot
Slave to Master
A read-data time slot begins like a write-one time slot. The voltage on the data line must remain below
V
DS1921H/Z will start pulling the data line low; its internal timing generator determines when this pull-
down ends and the voltage starts rising again. When responding with a 1, the DS1921H/Z will not hold
the data line low at all, and the voltage starts rising as soon as t
The sum of t
other side define the master sampling window (t
read from the data line. For most reliable communication, t
master should read close to but no later than t
wait until t
for the next time slot.
TL
until the read low time t
V
V
SLOT
IHMASTER
IHMASTER
V
V
RL
V
V
ILMAX
ILMAX
V
V
V
V
PUP
PUP
0V
0V
is expired. This guarantees sufficient recovery time t
TH
TH
+ δ (rise time) on one side and the internal timing generator of the DS1921H/Z on the
TL
TL
t
F
t
F
RESISTOR
RESISTOR
t
W1L
RL
ε
is expired. During the t
t
W0L
MSRMAX
MSRMIN
31 of 45
MASTER
MASTER
t
SLOT
. After reading from the data line, the master must
t
SLOT
to t
RL
MSRMAX
RL
RL
window, when responding with a 0, the
should be as short as permissible and the
is over.
) in which the master must perform a
REC
for the DS1921H/Z to get ready
t
REC
DS1921H/Z