Datasheet

DS1921H/Z
45 of 45
Maxim Integrated cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim Integrated product. No circuit patent licenses
are implied. Maxim Integrated reserves the right to change the circuitry and specifications without notice at any time. The parametric values (min and max limits)
shown in the Electrical Characteristics table are guaranteed. Other parametric values quoted in this data sheet are provided for guidance.
Maxim Integrated 160 Rio Robles, San Jose, CA 95134 USA 1- 408- 601-1000
© 2013 Maxim Integrated Products, Inc. Maxim Integrated and the Maxim Integrated logo are trademarks of Maxim Integrated Products, Inc.
REVISION HISTORY
REVISION
DATE
DESCRIPTION
PAGES
CHANGED
020402
Initial release
—
091202
Various updates to the Electrical Characteristics table, note 16 added.
36, 37, 38
100703
Branding change from Dallas to iButton, style updates, more detailed
register page map, various text updates regarding mission start and
1-Wire communication, added sections Mission Start and Logging
Process plus graphic, Memory Access Conflicts and Command-Specific
1-Wire Communication Protocol, note 17 added to Electrical
Characteristics table.
various
121003
Corrected the location of the CENT bit.
6, 7
051104
Added note 18 to Electrical Characteristics table.
42
110504
Extended note 18 of the Electrical Characteristics table.
42
082906
Changed UL text (from “application pending” to “designed to meet...”);
deleted row “Safety” from physical specification.
1
40
120407
Added bullet “Water resistant or waterproof if placed inside DS9107
iButton capsule (Exceeds Water Resistant 3 ATM requirements)”.
1
Add text to Application section: Note that the initial sealing level of
DS1921H/Z achieves IP56. Aging and use conditions can degrade the
integrity of the seal over time, so for applications with significant
exposure to liquids, sprays, or other similar environments, it is
recommended to place the Thermochron in the DS9107 iButton capsule.
The DS9107 provides a watertight enclosure that has been rated to IP68
(See www.maxim-ic.com/AN4126).
2
8/09
Added the # sign to the Part Numbers in the Ordering Information table,
indicating RoHS-compliant packages.
1
Removed the UL#913 bullet from the Common iButton Features
section.
1
12/11
Marking updated for RoHS.
1
Revised the last sentence of the Parasite Power section for more clarity.
3
In the Electrical Characteristics table, deleted ε from the t
W1L
specification, applied Note 11 to the t
W0L
specification, added more
details notes 6, 11 and 12.
41, 42
Added the Package Information section and completed the Revision
History.
44, 45
3/12
Added terminology updates for consistency with similar products.
1, 2, 5, 9
Added more details to the Parasite Power section.
3
6/13
Reworded the Electrical Characteristics table Note 18.
42
11/13
Added the Busy state during Copy Scratchpad to the Command-Specific
1-Wire Communication Protocol—Legend and examples sections
33, 34