DS1921K# Maxim Integrated Products, DS1921K# Datasheet - Page 35

• Manufacturer Part Number: DS1921K#
• Description: KIT IBUTTON THERMOCHRON
• Manufacturer: Maxim Integrated Products
• Series: iButton®r

Specifications of DS1921K#

• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Memory Size: -
• Memory Type: -
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant

Write Scratchpad, Reaching the End of the Scratchpad
Write Scratchpad, Not Reaching the End of the Scratchpad
Read Scratchpad
Copy Scratchpad (Success)
Copy Scratchpad (Invalid TA-E/S)
Read Memory (Success)
Read Memory (Invalid Address)
Reading reserved pages 20 through 63 or 68 through 127 or pages 192 and higher (beyond data-log memory)
results in 00h bytes.
RST
RST
RST
RST
RST
RST
RST
Master-to-Slave
<00 to EOP>
<32 bytes>
SYMBOL
AA loop
CRC-16
FF loop
00 loop
<data>
PD
PD Select
PD Select
PD Select
PD Select
PD Select
PD Select
Command-Specific 1-Wire Communication Protocol—Color Codes
Select
______________________________________________________________________________________
Command-Specific 1-Wire Communication Protocol—Legend
CPS
CPS TA-E/S
WS
WS TA
RM
RM
RS
Slave-to-Master
Transfer of as many 00h bytes as are needed to reach a memory page boundary
Transfer of 32 bytes
Transfer of an undetermined amount of data
Transfer of an inverted CRC-16
Indefinite loop where the master reads FFh bytes
Indefinite loop where the master reads AAh bytes
Indefinite loop where the master reads 00h bytes
TA
TA
TA
TA-E/S
TA-E/S
<data>
<data to EOM>
<data to EOS>
00 loop
<data to EOS>
AA loop
FF loop
RST
PD
CRC-16
00 loop
CRC-16
FF loop
FF loop
DESCRIPTION
1-Wire Communication Examples
Thermochron iButton
(continued)
35