DS1904 Datasheet PDF - Dallas Semiconductor
| Part Number | DS1904 | |
| Description | RTC iButton | |
| Manufacturers | Dallas Semiconductor | |
| Logo |  |
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There is a preview and DS1904 download ( pdf file ) link at the bottom of this page. Total 12 Pages | ||
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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
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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
Preview 5 Page |
Part DetailsOn this page, you can learn information such as the schematic, equivalent, pinout, replacement, circuit, and manual for DS1904 electronic component. |
| Information | Total 12 Pages | |
| Link URL | [ Copy URL to Clipboard ] | |
| Download | [ DS1904.PDF Datasheet ] | |
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