DS1923-F5 datasheet(4/53 Pages) DALLAS

Part #	DS1923-F5

Description	Hygrochron Temperature/Humidity Logger iButton with 8kB Data Log Memory

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Manufacturer	DALLAS [Dallas Semiconductor]

Direct Link	https://www.maximintegrated.com/en.html

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DS1923: Hygrochron Temperature/Humidity Logger iButton with 8kB Data Log Memory

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Note 17:

For software corrected accuracy, assume correction using calibration coefficients with calibration equations for error

compensation.

Note 18:

Software correction for humidity and temperature is handled automatically using the 1-Wire Viewer Software package available

at: http://www.ibutton.com.

Note 19:

WARNING: Not for use as the sole method of measuring or tracking temperature and/or humidity 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 and/or humidity 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 Dallas

Semiconductor/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:

Response time is determined by measuring the 1/e point as the device transitions from 40 to 90%RH or 90 to 40%RH, whichever

is slower. Test was performed at 5L/min airflow.

Note 21:

All DS1923 humidity measurements are 12-bit readings. Missioning determines 8-bit or 16-bit data logging. Battery lifetime is the

same no matter what RH resolution is logged.

Note 22:

Reliability studies have shown that the device survives a minimum of 1000 cycles of condensation and drying, but this product is

not guaranteed for extended use in condensing environments.

Note 23:

Software corrected accuracy is accomplished using the method detailed in the Software Correction Algorithm for Temperature

section of this data sheet.

Note 24:

Every DS1923 Device is measured and calibrated in a controlled, NIST-traceable RH environment.

Note 25:

Higher accuracy versions may be available. Contact the factory for details.

Note 26:

If this device is exposed to a high humidity environment (>70%RH), and then exposed to a lower RH environment, the device will

read high for a period of time. The device will typically read within +0.5%RH at 20%RH, 30 minutes after being exposed to

continuous 80%RH for 30 minutes.

Note 27:

All capacitive RH sensors can change their reading depending upon how long they have spent at high (>70%RH) or low RH

(<20%RH). This effect is called saturation drift and can be compensated through software, as described in the Software

Saturation Drift Compensation section of this data sheet.

Note 28:

Individual RH readings always include a noise component (repeatability). To minimize measurement error, average as many

samples as is reasonable.

Note 29:

Like all relative humidity sensors, when exposed to contaminants and/or conditions toward the limits of the safe operating range,

accuracy degradation can result (see Safe Operating Range chart). For maximum long-term stability, the sensor should not be

exposed or subjected to organic solvents, corrosive agents (strong acids, SO2, H2SO4, CI2 ,HCL, H2S, etc.) and strong bases

(compounds with PH greater than 7). Dust settling on the filter surface does not affect the sensor performance except to possibly

decrease the speed of response.

For more information on the RH sensor’s tolerance to chemicals visit:

http://content.honeywell.com/sensing/prodinfo/humiditymoisture/technical/c15_144.pdf

Note 30:

All humidity specifications are determined at +25°C except where specifically indicated.

Standard Values

DS1923 Values

Parameter

Standard Speed

Overdrive Speed

Standard Speed

Overdrive Speed

Name

Min

Max

Min

Max

Min

Max

Min

Max

tSLOT (incl. tREC)

61µs

(undef.)

7µs

(undef.)

65µs

1)

(undef.)

9.5µs

(undef.)

tRSTL

480µs

(undef.)

48µs

80µs

690µs

720µs

70µs

80µs

tPDH

15µs

60µs

2µs

6µs

15µs

63.5µs

2µs

7µs

tPDL

60µs

240µs

8µs

24µs

60µs

287µs

7µs

28µs

tW0L

60µs

120µs

6µs

16µs

60µs

120µs

7.5µs

12µs

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

PHYSICAL SPECIFICATION

Size

See mechanical drawing

Weight

Ca. 5.0 grams

Safety

Meets UL#913 (4

th Edit.); Intrinsically Safe Apparatus,

approval under Entity Concept for use in Class I,

Division 1, Group A, B, C, and D Locations

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