DS1923 Maxim, DS1923 Datasheet - Page 3

• Manufacturer Part Number: DS1923
• Description: The DS1923 temperature/humidity logger iButton® is a rugged, self-sufficient system that measures temperature and/or humidity and records the result in a protected memory section
• Manufacturer: Maxim

ELECTRICAL CHARACTERISTICS (continued)
(V
Presence-Detect Low Time
Presence-Detect Sample Time
(Note 1)
IO PIN: 1-Wire WRITE
Write-Zero Low Time
(Notes 1, 13)
Write-One Low Time
(Notes 1, 13)
IO PIN: 1-Wire READ
Read Low Time
(Notes 1, 14)
Read Sample Time
(Notes 1, 14)
REAL-TIME CLOCK (RTC)
Accuracy
Frequency Deviation
TEMPERATURE CONVERTER
Conversion Time
Thermal Response Time
Constant
Conversion Error Without
Software Correction
Conversion Error with Software
Correction
HUMIDITY CONVERTER (Note 20)
Humidity Response Time
Constant
RH Resolution
RH Range
PUP
= +3.0V to +5.25V, T
PARAMETER
Hygrochron Temperature/Humidity Logger
_______________________________________________________________________________________
A
= -20°C to +85°C.) (Note 31)
iButton with 8KB Data-Log Memory
SYMBOL
t
t
t
CONV
t
t
t
RESP
MSP
MSR
W0L
W1L
PDL
t
RL
RH
F
Standard speed, V
Standard speed (Note 11)
Overdrive speed, V
Overdrive speed (Note 11)
Standard speed, V
Standard speed
Overdrive speed
Standard speed
Overdrive speed, V
Overdrive speed (Note 11)
Standard speed
Overdrive speed
Standard speed
Overdrive speed
Standard speed
Overdrive speed
-20°C to +85°C
8-bit mode (Note 15)
16-bit mode (11 bits)
iButton package (Note 16)
(Notes 15, 17, 18, 19)
(Notes 15, 17, 18, 19)
Slow moving air (Note 21)
(Note 22)
(Note 23)
CONDITIONS
PUP
PUP
PUP
PUP
> 4.5V
> 4.5V
> 4.5V (Note 11)
> 4.5V (Note 11)
See RTC Accuracy graph
t
t
RL
RL
71.5
-300
0.64
MIN
240
7.5
60
60
65
60
30
See the Temperature
See the Temperature
7
7
8
6
5
1
5
1
8
0
+
+
Accuracy graph
Accuracy graph
TYP
0.04
130
30
12
1.95 -
15 -
MAX
1.95
1.95
+60
0.04
240
287
120
600
100
24
28
75
75
12
12
15
15
75
12
9
UNITS
Month
%RH
%RH
Min/
ppm
Bits
ms
°C
°C
μs
μs
μs
μs
μs
μs
s
s
3