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PDF DS1904 Data sheet ( Hoja de datos )
| Número de pieza | DS1904 | |
| Descripción | RTC iButton | |
| Fabricantes | Dallas Semiconductor | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de DS1904 (archivo pdf) en la parte inferior de esta página. Total 12 Páginas | ||
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www.iButton.com
PRELIMINARY
DS1904
RTC iButton
SPECIAL FEATURES
Real-Time Clock/calendar in binary format
Uses the same binary time/date representation
as the DS1994 but with 1 second resolution
Clock accuracy is better than ± 2 minutes per
www.DataSheet4mU.oconmth at 25°C
Operating temperature range from -40°C to
+70°C
Over 10 years of operation
COMMON iButton FEATURES
Unique, factory–lasered and tested 64-bit
registration number (8-bit family code + 48-
bit serial number + 8-bit CRC tester) assures
absolute traceability because no two parts are
alike
Multidrop controller for MicroLAN
Digital identification and information by
momentary contact
Chip-based data carrier compactly stores in-
formation
Data can be accessed while affixed to object
Economically communicates to host with a
single digital signal at 16.3k bits per second
Standard 16 mm diameter and 1-Wire proto-
col ensure compatibility with iButton Device
family
Button shape is self-aligning with cup-shaped
probes
Durable stainless steel case engraved with
registration number withstands harsh envi-
ronments
Easily affixed with self-stick adhesive back-
ing, latched by its flange, or locked with a
ring pressed onto its rim
Presence detector acknowledges when reader
first applies voltage
Meets UL#913 (4th Edit.); Intrinsically Safe
Apparatus, Approved under Entity Concept
for use in Class I, Division 1, Group A, B, C
and D Locations (application pending)
F5 MicroCan
5.89
0.36 0.51
16.25
YYWW REGISTERED RR
40 24
000000FBC52B
17.35
DATA
GROUND
All dimensions are shown in millimeters
ORDERING INFORMATION
DS1904L-F5
F5 MicroCan
EXAMPLES OF ACCESSORIES
DS9096P
Self-Stick Adhesive Pad
DS9101
Multi-Purpose Clip
DS9093RA
Mounting Lock Ring
DS9093A
Snap-In Fob
DS9092
iButton Probe
iButton DESCRIPTION
The DS1904 RTC iButton is a rugged real-time clock module that can be accessed with minimal
hardware. Data is transferred serially via the 1-Wire protocol, which requires only a single data lead and a
ground return. The DS1904 contains a unique 64-bit factory-lasered ROM and a real-time clock/calendar
implemented as a binary counter. The durable MicroCan package is highly resistant to environmental
1 of 12
022400
1 page  
CLOCK FUNCTION COMMAND FLOW CHART Figure 5
Master TX Control
Function Command
www.DataSheet4U.com
66H
Read Clock
?
Y
N
DS1904 copies
RTC Counter
to R/W Buffer
Bus Master RX
Device Control Byte
99H
Write Clock
?
Y
N
Bus Master TX
Device Control Byte
Bus Master TX
LS Byte (7:0)
DS1904
Bus Master RX
LS Byte (7:0)
Bus Master TX
next Byte (15:8)
Bus Master RX
next Byte (15:8)
Bus Master RX
next Byte (23:16)
Bus Master RX
MS Byte (31:24)
Bus Master TX
next Byte (23:16)
Bus Master TX
MS Byte (31:24)
N Bus Master
TX Reset
?
Y
N Bus Master
TX Reset
?
Y
N Bus Master
TX Reset
?
Y
DS1904 copies
R/W Buffer
to RTC Counter
DS1904 TX
Presence Pulse
5 of 12
5 Page 
PHYSICAL SPECIFICATION
Size
Weight
Humidity
Altitude
Expected Service Life
Safety
DS1904
See mechanical drawing
3.3 grams
90% RH at 50°C
10000 feet
10 years at 25°C
Meets UL#913 (4th Edit.); Intrinsically Safe
Apparatus, Approval under Entity Concept for
use in Class I, Division 1, Group A, B, C and
D Locations (application pending)
ABSOLUTE MAXIMUM RATINGS*
www.DataShVeoetl4tUa.gcoemon 1-Wire to Ground
Operating Temperature
Storage Temperature
-0.5V to +7.0V
-40°C to +70°C
-40°C to +70°C
* This is a stress rating only and functional operation of the device at these or any other conditions
above those indicated in the operation sections of this specification is not implied. Exposure to abso-
lute maximum rating conditions for extended periods of time may affect reliability.
DC ELECTRICAL CHARACTERISTICS
PARAMETER
SYMBOL
Logic 1
VIH
Logic 0
Output Logic Low @ 4 mA
VIL
VOL
Output Logic High
Input Load Current
VOH
IL
(VPUP=2.8V to 6.0V; -40°C to +70°C)
MIN
TYP MAX UNITS NOTES
2.2
6.0 V
1
-0.3
0.8 V
1,5
0.4 V
1
VPUP
V
1,2
5 µA 3
CAPACITANCE
PARAMETER
Capacitance 1-Wire
SYMBOL
CIN
MIN
(tA = 25°C)
TYP MAX UNITS NOTES
50 pF
AC ELECTRICAL CHARACTERISTICS
PARAMETER
SYMBOL
Time Slot
Write 1 Low Time
Write 0 Low Time
Read Low Time
Read Data Valid
Release Time
Read Data Setup
Recovery Time
Reset High Time
Reset Low Time
Presence Detect High
Presence Detect Low
tSLOT
tLOW1
tLOW0
tLOWR
tRDV
tRELEASE
tSU
tREC
tRSTH
tRSTL
tPDH
tPDL
(VPUP=2.8V to 6.0V; -40°C to +70°C)
MIN TYP MAX UNITS NOTES
60 120 µs
1 15 µs
60 120 µs
1 15 µs
exactly 15
µs 7
0
15 45
µs
1 µs
4
1 µs
480 µs
480
960 µs
6
15 60 µs
60 240 µs
11 of 12
11 Page | ||
| Páginas | Total 12 Páginas | |
| PDF Descargar | [ Datasheet DS1904.PDF ] | |
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