DS1923(2009) Просмотр технического описания (PDF) - Maxim Integrated

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DS1923
(Rev.:2009)

Hygrochron Temperature/Humidity Logger iButton with 8KB Data-Log Memory

Maxim Integrated 

Hygrochron Temperature/Humidity Logger

iButton with 8KB Data-Log Memory

ELECTRICAL CHARACTERISTICS (continued)

(VPUP = +3.0V to +5.25V, TA = -20°C to +85°C.)

Note 24: Software-corrected accuracy is accomplished using the method detailed in the Software Correction Algorithm for

Temperature section.

Note 25: Every DS1923 device is measured and calibrated in a controlled, NIST-traceable RH environment.

Note 26: Higher accuracy versions may be available. Contact the factory for details.

Note 27: If this device is exposed to a high humidity environment (> 70%RH), and then exposed to a lower RH environment, the

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

exposed to continuous 80%RH for 30 minutes.

Note 28: 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.

Note 29: Individual RH readings always include a noise component (repeatability). To minimize measurement error, average as

many samples as is reasonable.

Note 30: 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 the Safe Operating Range graph). For maximum long-term stability, the sen-

sor should not be exposed or subjected to organic solvents, corrosive agents (e.g., strong acids, SO2, H2SO4, CI2, HCL,

H2S) and strong bases (i.e., compounds with a 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 toler-

ance to chemicals visit: http://content.honeywell.com/sensing/prodinfo/humiditymoisture/technical/c15_144.pdf.

COMPARISON TABLE

LEGACY VALUES

DS1923 VALUES

PARAMETER

STANDARD SPEED

(μs)

OVERDRIVE SPEED

(μs)

STANDARD SPEED

(μs)

OVERDRIVE SPEED

(μs)

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

WEIGHT

SAFETY

See the Package Information section.

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.

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