DS1922E-F5# Maxim Integrated Products, DS1922E-F5# Datasheet - Page 4

• Manufacturer Part Number: DS1922E-F5#
• Description: IBUTTON TEMP LOGGER 4KBit F5
• Manufacturer: Maxim Integrated Products
• Series: iButton®r

Specifications of DS1922E-F5#

• Rohs Information: IButton RoHS Compliance Plan
• Memory Size: 512B
• Memory Type: NVSRAM (Non-Volatile SRAM)
• Lead Free Status / RoHS Status: Lead free by exemption / RoHS compliant by exemption

High-Temperature Logger iButton with 8KB
Data-Log Memory
Note 1:
Note 2:
Note 3:
Note 4:
Note 5:
Note 6:
Note 7:
Note 8:
Note 9:
Note 10: The I-V characteristic is linear for voltages less than 1V.
Note 11: The earliest recognition of a negative edge is possible at t
Note 12: Numbers in bold are not in compliance with the published iButton standards. See the Comparison Table .
Note 13: Interval during the negative edge on I/O at the beginning of a presence-detect pulse between the time at which the volt-
Note 14: ε in Figure 13 represents the time required for the pullup circuitry to pull the voltage on I/O up from V
Note 15: δ in Figure 13 represents the time required for the pullup circuitry to pull the voltage on I/O up from V
Note 16: To conserve battery power, use 8-bit temperature logging whenever possible.
Note 17: This number was derived from a test conducted by Cemagref in Antony, France, in July 2000:
Note 18: Includes +0.1°C/-0.2°C calibration chamber measurement uncertainty.
Note 19: Warning: Not for use as the sole method of measuring or tracking temperature in products and articles that could affect
Note 20: Guaranteed by design and not production tested.
Note 21: Devices leave the factory after having been run through a few cycles above +125°C. This is required for calibration of the
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Operation above +125°C is restricted to mission operations only. Communication and 1-Wire pin specifications are not
specified for operation above +125°C.
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 in the DS2480B can be required.
Capacitance on the data pin could be 800pF when V
2.5µs after V
V
V
Voltage below which, during a falling edge on I/O, a logic 0 is detected.
The voltage on I/O must be less than or equal to V
Voltage above which, during a rising edge on I/O, a logic 1 is detected.
After V
age is 90% of V
maximum duration for the master to pull the line low is t
threshold of the bus master. The actual maximum duration for the master to pull the line low is t
www.cemagref.fr/English/index.htm Test Report No. E42.
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, and 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 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 redun-
dant information sources are used. Data-logger products are 100% tested and calibrated at time of manufacture by
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.
device but should not affect lifetime of the device as specified. However, this process results in a nonzero value in the
Device Samples Counter register (0223h–0225h), which provides evidence the device has been factory calibrated.
TL
TH
and V
and V
TH
is crossed during a rising edge on I/O, the voltage on I/O must drop by V
TH
TL
PUP
are a function of the internal supply voltage, which is a function of V
maximum specifications are valid at V
PUP
has been applied, the parasite capacitance does not affect normal communications.
and the time at which the voltage is 10% of V
ILMAX
PUPMAX
PUP
W1LMAX
whenever the master drives the line low.
is first applied. If a 2.2kΩ resistor is used to pull up the data line
REH
(5.25V). In any case, V
after V
+ t
PUP
F
- ε and t
.
TH
has been previously reached.
W0LMAX
PUP
TL
HY
+ t
< V
and the 1-Wire recovery times. The
to be detected as logic 0.
F
TH
- ε, respectively.
< V
PUP
RLMAX
.
IL
IL
+ t
to V
to the input high
F
.
TH
. The actual