DS1923 查看數據表（PDF） - Dallas Semiconductor -> Maxim Integrated

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DS1923

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

Dallas Semiconductor -> Maxim Integrated 

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

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

compensation.

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

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

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.

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.

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.

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.

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

section of this data sheet.

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

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

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.

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.

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

samples as is reasonable.

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

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

Parameter

Name

tSLOT (incl. tREC)

tRSTL

tPDH

tPDL

tW0L

Standard Values

Standard Speed

Overdrive Speed

Min

Max

Min

Max

61µs

(undef.) 7µs

(undef.)

480µs (undef.) 48µs

80µs

15µs

60µs

2µs

6µs

60µs

240µs 8µs

24µs

60µs

120µs 6µs

16µs

DS1923 Values

Standard Speed

Overdrive Speed

Min

65µs1)

Max

Min

(undef.) 9.5µs

Max

(undef.)

690µs 720µs 70µs

80µs

15µs

63.5µs 2µs

7µs

60µs

287µs 7µs

28µs

60µs

120µs 7.5µs

12µs

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

PHYSICAL SPECIFICATION

Size

Weight

Safety

See mechanical drawing

Ca. 5.0 grams

Meets UL#913 (4th Edit.); Intrinsically Safe Apparatus,

approval under Entity Concept for use in Class I,

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

pending)

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