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DS1922L/DS1922T
iButton Temperature Loggers
with 8KB Data-Log Memory
ELECTRICAL CHARACTERISTICS (continued)
(V PUP = +3.0V to +5.25V.)
Note 7:
Note 8:
Note 9:
Note 10:
Note 11:
Note 12:
Note 13:
Note 14:
Note 15:
Note 16:
Note 17:
Note 18:
Note 19:
Note 20:
The voltage on IO must be less than or equal to V ILMAX whenever the master drives the line low.
Voltage above which, during a rising edge on IO, a logic 1 is detected.
After V TH is crossed during a rising edge on IO, the voltage on IO must drop by V HY 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 t REH after V TH has been previously reached.
Numbers in bold are not in compliance with the published iButton device standards. See the Comparison Table.
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 V PUP and the time at which the voltage is 10% of V PUP .
ε in Figure 13 represents the time required for the pullup circuitry to pull the voltage on IO up from V IL to V TH . The actual
maximum duration for the master to pull the line low is t W1LMAX + t F - ε and t W0LMAX + t F - ε , respectively.
δ in Figure 13 represents the time required for the pullup circuitry to pull the voltage on IO up from V IL to the input-high
threshold of the bus master. The actual maximum duration for the master to pull the line low is t RLMAX + t F .
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 2000:
www.cemagref.fr/English/index.htm Test Report No. E42.
Includes +0.1/-0.2°C calibration chamber measurement uncertainty.
Warning: Maxim data-logger products are 100% tested and calibrated at time of manufacture to ensure that they meet all
data sheet parameters, including temperature accuracy. As with any sensor-based product, user shall be responsible for
occasionally rechecking the temperature accuracy of the product to ensure it is still operating properly. Furthermore, as
with all products of this type, when deployed in the field and subjected to handling, harsh environments, or other hazards/
use conditions, there may be some extremely small but nonzero logger failure rate. In applications where the failure of any
logger is a concern, user shall assure that redundant (or other primary) methods of testing and determining the handling
methods, quality, and fitness of the articles and products are implemented to further mitigate any risk.
Assumes using calibration memory with calibration equations for error compensation. Includes +0.1/-0.2°C calibration
chamber measurement uncertainty. Guaranteed by design.
COMPARISON TABLE
LEGACY VALUES
DS1922L/DS1922T VALUES
PARAMETER
STANDARD SPEED
(μs)
OVERDRIVE SPEED
(μs)
STANDARD SPEED
(μs)
OVERDRIVE SPEED
(μs)
MIN
MAX
MIN
MAX
MIN
MAX
MIN
MAX
t SLOT (including t REC )
t RSTL
t PDH
t PDL
t W0L
61
480
15
60
60
(undefined)
(undefined)
60
240
120
7
48
2
8
6
(undefined)
80
6
24
16
65 *
690
15
60
60
(undefined)
720
63.5
287
120
9.5
70
2
7
7.5
(undefined)
80
7
28
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 device standards.
iButton CAN PHYSICAL SPECIFICATION
SIZE
WEIGHT
4
See the Package Information section.
Ca. 3.3 grams
Maxim Integrated
发布紧急采购，3分钟左右您将得到回复。
相关PDF资料
DS1923-F5#
IBUTTON TEMP/HUMIDITY LOGGER F5
DS1961S-F3#
IBUTTON EEPROM 1KBit F3
DS1963S-F5+
IBUTTON MONETARY SHA-1
DS1971-F3+
IBUTTON EEPROM 256KBIT F3
DS1972-F3+
IBUTTON EEPROM 1KBit F3
DS1973-F3+
IBUTTON EEPROM 4KBit F3
DS1977-F5#
IBUTTON EEPROM 32KBit F5
DS1982-F5+
IBUTTON 1KBit ADD-ONLY F5
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