Note 17: WARNING: Not for use as the sole method of measuring or tracking temperature in products and articles that could affect

the health or safety of persons, plants, animals, or other living organisms, including but not limited to foods, beverages,

pharmaceuticals, medications, blood and blood products, organs, flammable, and combustible products. User shall

assure that redundant (or other primary) methods of testing and determining the handling methods, quality, and fitness of

the articles and products should be implemented. Temperature tracking with this product, where the health or safety of the

aforementioned persons or things could be adversely affected, is only recommended when supplemental or redundant

information sources are used. Data-logger products are 100% tested and calibrated at time of manufacture by Maxim to

ensure that they meet all data sheet parameters, including temperature accuracy. User shall be responsible for proper use

and storage of this product. As with any sensor-based product, user shall also be responsible for occasionally rechecking

the temperature accuracy of the product to ensure it is still operating properly.

Note 18: The number of temperature conversions (= samples) possible with the built-in energy source depends on the operating and

storage temperature of the device. When not in use for a mission, the RTC oscillator should be turned off and the device

should be stored at a temperature not exceeding +25°C. Under this condition the shelf life time is 10 years minimum.

Thermochron iButton

4

_______________________________________________________________________________________

COMPARISON TABLE

LEGACY VALUES

DS1921G VALUES

STANDARD SPEED (μs)

OVERDRIVE SPEED (μs)

STANDARD SPEED (μs)

OVERDRIVE SPEED (μs)

PARAMETER

MIN

MAX

MIN

MAX

MIN

MAX

MIN

MAX

61

(undefined)

7

(undefined)

65*

(undefined)

8*

(undefined)

480

(undefined)

48

80

540

640

58

80

15

60

2

6

15

60

1.1

6

60

240

8

24

60

270

7.5

32

60

120

6

16

60

120

8.5

15

iButton CAN PHYSICAL SPECIFICATION

SIZE

See the Package Information section.

WEIGHT

Ca. 3.3g

SAFETY

Meets UL 913, 5th Ed., Rev. 1997-02-24; Intrinsically Safe Apparatus, approval under Entity Concept for use in

Class I, Division 1, Group A, B, C, and D Locations.

*

Intentional change; longer recovery time between time slots.

Note: Numbers in bold are not in compliance with the published iButton standards.

ELECTRICAL CHARACTERISTICS (continued)