Datasheet

DS1922L/DS1922T
Temperature Logger iButton with 8KB
Data-Log Memory
2 _______________________________________________________________________________________
ABSOLUTE MAXIMUM RATINGS
ELECTRICAL CHARACTERISTICS
(V
PUP
= +3.0V to +5.25V.)
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional
operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to
absolute maximum rating conditions for extended periods may affect device reliability.
IO Voltage Range to GND ........................................-0.3V to +6V
IO Sink Current....................................................................20mA
Operating Temperature Range
DS1922L ...........................................................-40°C to +85°C
DS1922T ............................................................0°C to +125°C
Junction Temperature......................................................+150°C
Storage Temperature Range*
DS1922L..........................................................-40°C to +85°C*
DS1922T...........................................................0°C to +125°C*
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
DS1922L (Note 1) -40 +85
Operating Temperature T
A
DS1922T (Note 1) 0 +125
°C
IO PIN: GENERAL DATA
1-Wire Pullup Resistance R
PUP
(Notes 2, 3) 2.2 k
Input Capacitance C
IO
(Note 4) 100 800 pF
Input Load Current I
L
IO pin at V
PUP
6 10 μA
High-to-Low Switching Threshold V
TL
(Notes 5, 6) 0.4 3.2 V
Input Low Voltage V
IL
(Notes 2, 7) 0.3 V
Low-to-High Switching Threshold V
TH
(Notes 5, 8) 0.7 3.4 V
Switching Hysteresis V
HY
(Note 9) 0.09 N/A V
Output Low Voltage V
OL
At 4mA (Note 10) 0.4 V
Standard speed, R
PUP
= 2.2k 5
Overdrive speed, R
PUP
= 2.2k 2
Recovery Time (Note 2) t
REC
Overdrive speed, directly prior to reset
pulse; R
PUP
= 2.2k
5
μs
Rising-Edge Hold-Off Time t
REH
(Note 11) 0.6 2.0 μs
Standard speed 65
Overdrive speed, V
PUP
> 4.5V 8
Time-Slot Duration (Note 2) t
SLOT
Overdrive speed (Note 12) 9.5
μs
IO PIN: 1-Wire RESET, PRESENCE-DETECT CYCLE
Standard speed, V
PUP
> 4.5V 480 720
Standard speed (Note 12) 690 720
Overdrive speed, V
PUP
> 4.5V 48 80
Reset Low Time (Note 2) t
RSTL
Overdrive speed (Note 12) 70 80
μs
Standard speed, V
PUP
> 4.5V 15 60
Standard speed (Note 12) 15 63.5
Presence-Detect High Time t
PDH
Overdrive speed (Note 12) 2 7
μs
Standard speed, V
PUP
> 4.5V 1.5 5
Standard speed 1.5 8
Presence-Detect Fall Time
(Note 13)
t
FPD
Overdrive speed 0.15 1
μs
* Storage or operation above +50°C significantly reduces battery life.