DS1921H_11 MAXIM [Maxim Integrated Products], DS1921H_11 Datasheet - Page 41

• Manufacturer Part Number: DS1921H_11
• Description: High-Resolution Thermochron iButton
• Manufacturer: MAXIM [Maxim Integrated Products]

NOTES
Presence Detect High
Time
Presence Detect Low
Time
Presence Detect
Sample Time
IO pin, 1-Wire Write
Write-0 Low Time
Write-1 Low Time
IO pin, 1-Wire Read
Read Low Time
Read Sample Time
Real-Time Clock
Frequency Deviation
Temperature Converter
Tempcore Operating
Range
Conversion Time
Thermal Response
Time Constant
Conversion Error
Number of
Conversions
10) The I-V characteristic is linear for voltages less than 1V.
1) System Requirement.
2) Maximum allowable pull-up resistance is a function of the number of 1-Wire devices in the
3) Capacitance on IO could be 800pF when power is first applied. If a 2.2kΩ resistor is used to pull
4) Input load is to ground.
5) All voltages are referenced to ground.
6) V
7) Voltage below which, during a falling edge on IO, a logic 0 is detected.
8) The voltage on IO needs to be less or equal to V
9) Voltage above which, during a rising edge on IO, a logic 1 is detected.
PARAMETER
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
pull-up such as that found in the DS2480B may be required.
up the data line, 2.5µs after V
communication.
1-Wire recovery times. The V
any case, V
TL
and V
TH
TL
are functions of the internal supply voltage, which is a function of V
< V
TH
SYMBOL
N
t
< V
τ
t
t
t
t
t
t
CONV
T
∆ϑ
RESP
CONV
W0L
W1L
t
MSR
PDH
MSP
∆
PDL
RL
TC
F
PUP
.
PUP
TH
Standard Speed
Overdrive Speed
Standard Speed
Overdrive Speed
Standard Speed
Overdrive Speed
Standard Speed
Overdrive Speed
Standard Speed
Overdrive Speed
Standard Speed
Overdrive Speed
Standard Speed
Overdrive Speed
-5°C to +46°C
DS1921H
DS1921Z
and V
has been applied the parasite capacitor will not affect normal
CONDITIONS
TL
maximum specifications are valid at V
41 of 45
ILMAX
whenever the master drives the line low.
t
t
MIN
RL
RL
-48
1.1
7.5
(see lifetime graphs)
15
60
60
60
15
75
-5
-1
6
6
5
1
5
1
+ δ
+ δ
TYP
130
MAX UNITS NOTES
15 - δ
2 - δ
270
120
+46
+26
360
8.6
+1
60
24
75
15
15
15
46
6
2
2
PUP
PUP
PPM
ms
°C
°C
µs
µs
µs
µs
µs
µs
µs
—
= 5.25V. In
s
and the
1, 11, 15
17, 18
14, 16
1, 16
1, 11
1, 12
1, 12
15
15
13