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

零件编号

产品描述 (功能)

生产厂家

DS1923

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

Dallas Semiconductor -> Maxim Integrated 

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

PARAMETER

SYMBOL

CONDITIONS

MIN TYP MAX UNITS

IO Pin, 1-Wire Write

Standard speed

60

120

Write-0 Low Time

(Note 1)

tW0L

Overdrive speed, VPUP > 4.5V

(Note 11)

6

12

µs

Overdrive speed (Note 11)

7.5

12

Write-1 Low Time

(Notes 1, 13)

tW1L

Standard speed

Overdrive speed

5

1

15 - e

1.95 - e

µs

IO Pin, 1-Wire Read

Read Low Time

(Notes 1, 14)

tRL

Standard speed

Overdrive speed

5

1

15 - d µs

1.95 - d

Read Sample Time

(Notes 1, 14)

Real-Time Clock

tMSR

Standard speed

Overdrive speed

tRL + d

tRL + d

15

1.95

µs

Accuracy

+25°C

-3

+3

min./

month

Frequency Deviation

DF

Temperature Converter

-20°C to +85°C

-300

+60 PPM

Conversion Time

tCONV

8-bit mode (Note 15)

16-bit mode (11 bits)

30

240

75

600

ms

Thermal Response

Time Constant

tRESP iButton package (Note 16)

130

s

Conversion Error

Without Software

Correction

DJ

(Notes 15, 17, 18, 19)

See Temperature

Accuracy Graphs

°C

Conversion Error With

Software Correction

DJ

(Notes 15, 17, 18, 19)

See Temperature

Accuracy Graphs

°C

Humidity Converter (Note 30)

Humidity Response

Time Constant

tRH

Slow moving air (Note 20)

30

s

RH Resolution

(Note 21)

8

12

12

bits

0.64 0.04 0.04 %RH

RH Range

(Note 22)

0

100 %RH

RH Accuracy and

Interchangeability

With software correction

(Notes 18, 19, 23, 24, 25)

±5

%RH

RH Nonlinearity

With software correction (Note 18)

<1

RH Hysteresis

(Notes 26, 27)

0.5

%RH

RH Repeatability

(Note 28)

±0.5

%RH

Long-Term Stability

At 50%RH (Note 29)

<1.0

%RH/y

Note 1:

Note 2:

Note 3:

Note 4:

Note 5:

Note 6:

Note 7:

Note 8:

Note 9:

Note 10:

Note 11:

Note 12:

Note 13:

Note 14:

Note 15:

Note 16:

System requirement.

Maximum allowable pullup resistance is a function of the number of 1-Wire devices in the system and 1-Wire recovery times. The

specified value here applies to systems with only one device and with the minimum 1-Wire recovery times. For more heavily

loaded systems, an active pullup such as that found in the DS2480B may be required.

Capacitance on the data pin could be 800pF when VPUP is first applied. If a 2.2kW resistor is used to pull up the data line 2.5µs

after VPUP has been applied, the parasite capacitance does not affect normal communications.

VTL, VTH are a function of the internal supply voltage.

Voltage below which, during a falling edge on IO, a logic '0' is detected.

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

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

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

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

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

Highlighted numbers are NOT in compliance with the published iButton standards. See comparison table below.

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.

e represents the time required for the pullup circuitry to pull the voltage on IO up from VIL to VTH.

d 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.

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

This number was derived from a test conducted by Cemagref in Antony, France, in July of 2000.

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

3 of 52

Share Link: