DS1922L-F5 datasheet(4/52 Pages) MAXIM

Part #	DS1922L-F5

Description	Temperature Logger iButton with 8KB Data-Log Memory

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Manufacturer	MAXIM [Maxim Integrated Products]

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Note 7:

The voltage on IO must be less than or equal to VILMAX whenever the master drives the line low.

Note 8:

Voltage above which, during a rising edge on IO, a logic 1 is detected.

Note 9:

After VTH is crossed during a rising edge on IO, the voltage on IO must drop by VHY to be detected as logic 0.

Note 10: The I-V characteristic is linear for voltages less than 1V.

Note 11: The earliest recognition of a negative edge is possible at tREH after VTH has been previously reached.

Note 12: Numbers in bold are not in compliance with the published iButton standards. See the

Comparison Table.

Note 13: Interval during the negative edge on IO at the beginning of a presence-detect pulse between the time at which the voltage

is 90% of VPUP and the time at which the voltage is 10% of VPUP.

Note 14:

ε in Figure 13 represents the time required for the pullup circuitry to pull the voltage on IO up from VIL to VTH. The actual

maximum duration for the master to pull the line low is tW1LMAX + tF -

ε and tW0LMAX + tF - ε, respectively.

Note 15:

δ in Figure 13 represents the time required for the pullup circuitry to pull the voltage on IO up from VIL to the input-high

threshold of the bus master. The actual maximum duration for the master to pull the line low is tRLMAX + tF.

Note 16: To conserve battery power, use 8-bit temperature logging whenever possible.

Note 17: This number was derived from a test conducted by Cemagref in Antony, France, in July 2000:

www.cemagref.fr/English/index.htm Test Report No. E42.

Note 18: Includes +0.1/-0.2°C calibration chamber measurement uncertainty.

Note 19: 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 20: Assumes using calibration memory with calibration equations for error compensation. Includes +0.1/-0.2°C calibration

chamber measurement uncertainty. Guaranteed by design.

Temperature Logger iButton with 8KB

Data-Log Memory

4

_______________________________________________________________________________________

COMPARISON TABLE

LEGACY VALUES

DS1922L/DS1922T VALUES

STANDARD SPEED

(μs)

OVERDRIVE SPEED

(μs)

STANDARD SPEED

(μs)

OVERDRIVE SPEED

(μs)

PARAMETER

MIN

MAX

MIN

MAX

MIN

MAX

MIN

MAX

tSLOT (including tREC)

61

(undefined)

7

(undefined)

65

*

(undefined)

9.5

(undefined)

tRSTL

480

(undefined)

48

80

690

720

70

80

tPDH

15

60

2

6

15

63.5

2

7

tPDL

60

240

8

24

60

287

7

28

tW0L

60

120

6

16

60

120

7.5

12

*

Intentional change; longer recovery time requirement due to modified 1-Wire front-end.

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

iButton CAN PHYSICAL SPECIFICATION

SIZE

See the Package Information section.

WEIGHT

Ca. 3.3 grams

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.

ELECTRICAL CHARACTERISTICS (continued)

(VPUP = +3.0V to +5.25V.)

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