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DS1921G
Thermochron iButton Device
ELECTRICAL CHARACTERISTICS (continued)
(V PUP = +2.8V to +5.25V, T A = -40°C to +85°C.)
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
IO PIN: 1-Wire WRITE
Standard speed
60
120
Write-Zero Low Time
(Notes 1, 12, 13)
t W0L
Overdrive speed, V PUP > 4.5V
6
15
μs
Overdrive speed
8.5
15
Write-One Low Time
(Notes 1, 13)
t W1L
Standard speed
Overdrive speed
5
1
15
2
μs
IO PIN: 1-Wire READ
Read Low Time (Notes 1, 14)
Read Sample Time
(Notes 1, 14)
t RL
t MSR
Standard speed
Overdrive speed
Standard speed
Overdrive speed
5
1
t RL +
t RL +
15 -
2-
15
2
μs
μs
REAL-TIME CLOCK
Frequency Deviation
F
-5°C to +46°C
-48
+46
ppm
TEMPERATURE CONVERTER
Tempcore Operating Range
Conversion Time
Thermal Response Time
Constant
T TC
t CONV
RESP
(Note 15)
-40°C to < -30°C
-40
19
-1.3
130
+85
90
+1.3
°C
ms
s
Conversion Error
(Notes 16, 17)
-30°C to +70°C
> +70°C to +85°C
-1.0
-1.3
+1.0
+1.3
°C
Number of Conversions
N CONV
(Notes 4, 18)
(See the lifetime graphs.)
—
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 IO could be 800pF when power is first applied. If a 2.2k Ω resistor is used to pull up the data line, 2.5μs
after V PUP has been applied, the parasite capacitor does not affect normal communication.
These values are derived from simulation across process, voltage, and temperature and are not production tested.
Input load is to ground.
All voltages are referenced to ground.
V TL and V TH are functions of the internal supply voltage, which is a function of V PUP and the 1-Wire recovery times. The
V TH and V TL maximum specifications are valid at V PUP = 5.25V. In any case, V TL < V TH < V PUP .
Voltage below which, during a falling edge of IO, a logic 0 is detected.
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.
The I-V characteristic is linear for voltages less than 1V.
Numbers in bold are not in compliance with the published iButton device standards. See the Comparison Table.
ε in Figure 15 represents the time required for the pullup circuitry to pull the voltage on the IO pin 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 15 represents the time required for the pullup circuitry to pull the voltage on the IO pin 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 .
This number was derived from a test conducted by Cemagref in Antony, France, in July 2000.
http://www.cemagref.fr/English/index.htm Test Report No. E42
Total accuracy is Δ ? plus 0.25°C quantization due to the 0.5°C digital resolution of the device.
Maxim Integrated
3
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