DS1921 DALLAS [Dallas Semiconductor], DS1921 Datasheet - Page 42

• Manufacturer Part Number: DS1921
• Description: High-Resolution Thermochron iButton
• Manufacturer: DALLAS [Dallas Semiconductor]

1) Intentional change, longer recovery time between time slots.
Parameter
Name
t
t
t
t
t
10) The I-V characteristic is linear for voltages less than 1V.
11)
12)
13) This number was derived from a test conducted by Cemagref in Antony, France, in July of 2000.
14) The number of temperature conversions (= Samples) possible with the built-in energy source
15) Highlighted numbers are not in compliance with the published iButton standards. See comparison
16) These values are derived from simulation across process, voltage, and temperature and are not
17) Total accuracy is
18) WARNING: Not for use as the sole or primary method of measuring or tracking temperature
SLOT
RSTL
PDH
PDL
W0L
9) Voltage above which, during a rising edge on IO, a logic 1 is detected.
(incl. t
V
input high threshold of the bus master.
http://www.cemagref.fr/English/index.htm
depends on the operating and storage temperature of the device. When not in use for a mission,
the RTC oscillator should be turned off and device should be stored at a temperature not
exceeding +25°C. Under this condition the shelf life time is 10 years minimum.
table below.
production tested.
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 other primary and redundant 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 is recommended only as a supplemental and redundant
information source. User shall be responsible for proper use, storage, and calibration of this
product.
represents the time required for the pull-up circuitry to pull the voltage on IO up from V
TH
represents the time required for the pull-up circuitry to pull the voltage on IO up from V
.
REC
)
61µs
480µs
15µs
60µs
60µs
Standard Speed
min
plus 1/16°C quantization due to the 1/8°C digital resolution of the device.
(undef.)
(undef.)
60µs
240µs
120µs
Standard Values
max
7µs
48µs
2µs
8µs
6µs
Overdrive Speed
min
42 of 44
Test Report No. E42
(undef.)
80µs
6µs
24µs
16µs
max
65µs
540µs
15µs
60µs
60µs
Standard Speed
min
1)
DS1921H/Z Values
(undef.)
640µs
60µs
270µs
120µs
max
8µs
48µs
1.1µs
7.5µs
6µs
Overdrive Speed
min
1)
(undef.)
80µs
6µs
24µs
15µs
DS1921H/Z
IL
IL
max
to
to the