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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.

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© 2020 Maxim Integrated Products, Inc. │ 46

DS1925

iButton High-Capacity Temperature Logger

with 122KB Data-Log Memory

Revision History

REVISION

NUMBER

REVISION

DATE

DESCRIPTION

PAGES

CHANGED

0

3/16

Initial release

—

1

4/16

Updated Typical Application Circuit, Electrical Characteristics table, Pin

Configuration, Figure 2, Clear Memory State section, Table 1, Figure 5, Sample

Rate section, RTC Control section, Table 10, Table 16, Other Indicator section,

Security by Password section, Missioning section, Writing with Verification

section, Write Scratchpad Command [0Fh] section, removed Copy Scratchpad

with Password Command [99h] section, updated Figures 9b, 9c, 9d, 9e, 9f,

removed Start Mission with Password [CCh] and Stop Mission with Password

[33h] sections, updated External Power Command (XPC) [66h] section, XPC

Read Memory [44h] section, XPC Clear Memory [96h] section, XPC Forced

Conversion [4Bh] section, XPC Read Battery Voltage [33h] section, added

Mission Backup Registers section, updated Table 25, CRC Generation section,

Command-Specific 1-Wire Communication Protocol—Legend table, 1-Wire

Communication Examples, Mission Example: Prepare and Start a New Mission

section, Table 28, and added Figure 15

1–3, 6–8, 11, 13,

15–20, 22–29,

36–45

2

10/16

Updated Product Lifetime diagram

5

3

1/19

Updated Typical Product Lifetime figure, Memory section, Figure 6, Table 6,

Mission Timestamp section, added device version, Table 19, and renumbered

Tables 20–30

BOR behavior:

01h (major), 16h (minor): BOR bit (msbit 0214h) is not functional.

01h (major), 17h (minor) and higher: BOR bit (msbit 0214h) is functional. Cleared

on XPC Clear Memory (log).

5, 9, 10, 12,

14–17, 30,

42–45

4

6/20

Updated Electrical Characteristics table, added Note 16, Clear Memory State,

Figure 9c, Figure 9d, Figure 9f, XPC Copy Scratchpad [99h], XPC Start Mission

[DDh], XPC Forced Conversion [4Bh], XPC Read Battery Voltage [33h], and

Table 29

3, 4, 8, 23,

24, 26, 27, 29, 44

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