DS1921H/Z Maxim Integrated Products, DS1921H/Z Datasheet - Page 4

• Manufacturer Part Number: DS1921H/Z
• Description: High Resolution Thermochron Ibutton Range H
• Manufacturer: Maxim Integrated Products

HIERARCHICAL STRUCTURE FOR 1-Wire PROTOCOL Figure 2
64-BIT LASERED ROM Figure 3
MSB
MSB
DEVICE
DS1921H-F5
DS1921Z-F5
DS1921L-F51
DS1921L-F52
DS1921L-F53
DS1921L-F50
CRC Code
Master
Command
Level:
8-Bit
Bus
1-Wire ROM Function
LSB
Memory Function
DS1921-Specific
Commands
Commands
RANGE (°C)
+15 to +46
-10 to +85
-20 to +85
-30 to +85
-40 to +85
-5 to +26
MSB
TEMP.
12-Bit Temperature
Range Code
1-Wire net
RESOLUTION
Commands
DS1921
Read ROM
Match ROM
Search ROM
Skip ROM
Overdrive Skip
Overdrive Match
Conditional Search
Write Scratchpad
Read Scratchpad
Copy Scratchpad
Read Memory
Read Memory w/CRC
Clear Memory
Convert Temperature
0.125
0.125
Available
(°C)
0.5
0.5
0.5
0.5
LSB
ROM
MSB
4 of 40
0100
0011
0011
0010
0001
0000
36-Bit Serial Number
TEMP. RANGE CODE
Codes
Cmd.
CCh
ECh
AAh
3Ch
A5h
3Ch
33h
55h
F0h
69h
0Fh
55h
F0h
44h
1111
1011
0100
0101
0101
0110
Devices
Other
Data Field
64-bit Reg. #
64-bit Reg. #
64-bit Reg. #
N/A
OD-Flag
64-bit Reg. #, OD-Flag
64-bit Reg. #, Cond. Search settings,
256-bit scratchpad, flags
256-bit scratchpad
4096-bit SRAM, registers, flags
All memory
All memory
Mission Time Stamp, Mission Samples
Memory address 211h
Affected
0010
0010
1100
0100
1100
0100
LSB
device status
Counter, Start Delay, Sample
Rate, Alarm Time Stamps and
Durations, Histogram Memory
MSB
EQUIVALENT
8-Bit Family
Code (21h)
HEX.
34C
15C
4F2
3B2
254
064
LSB
LSB