DS1904L-F5# Maxim Integrated Products, DS1904L-F5# Datasheet

IBUTTON RTC F5 MICROCAN

DS1904L-F5#

Manufacturer Part Number
DS1904L-F5#
Description
IBUTTON RTC F5 MICROCAN
Manufacturer
Maxim Integrated Products
Series
iButton®r
Datasheet

Specifications of DS1904L-F5#

Rohs Information
IButton RoHS Compliance Plan
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Memory Size
-
Memory Type
-
Lead Free Status / Rohs Status
Lead free / RoHS Compliant

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Company:
Part Number:
DS1904L-F5#
Manufacturer:
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Quantity:
245
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Part Number:
DS1904L-F5#DS1904L-F5+
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www.maxim-ic.com
SPECIAL FEATURES
 Real-Time Clock/calendar in binary format
 Uses the same binary time/date representation
 Clock accuracy is better than  2 minutes per
 Operating temperature range from -40°C to
 Over 10 years of operation
COMMON iButton FEATURES
 Unique, factory–lasered and tested 64-bit
 Multidrop controller for MicroLAN
 Digital identification and information by
 Chip-based data carrier compactly stores in-
 Data can be accessed while affixed to object
 Economically communicates to host with a
 Standard 16 mm diameter and 1-Wire
 Button shape is self-aligning with cup-shaped
 Durable stainless steel case engraved with
 Easily affixed with self-stick adhesive back-
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
19-4864; 8/09
1-Wire and iButton are registered trademarks of Maxim Integrated
Products, Inc.
as the DS1994 but with 1 second resolution
month at 25°C
+70°C
registration number (8-bit family code + 48-
bit serial number + 8-bit CRC tester) assures
absolute traceability because no two parts are
alike
momentary contact
formation
single digital signal at 16.3k bits per second
protocol ensure compatibility with iButton
Device family
probes
registration number withstands harsh envi-
ronments
ing, latched by its flange, or locked with a
ring pressed onto its rim
®
®
1 of 13
 Presence detector acknowledges when reader
 Meets UL#913 (4th Edit.); Intrinsically Safe
F5 MicroCan
All dimensions are shown in millimeters
ORDERING INFORMATION
DS1904L-F5#
# Denotes an RoHS-compliant device that may include
lead(Pb) that is exempt under the RoHS requirements.
EXAMPLES OF ACCESSORIES
DS9096P
DS9101
DS9093RA
DS9093A
DS9092
IO
first applies voltage
Apparatus, Approved under Entity Concept
for use in Class I, Division 1, Group A, B, C
and D Locations (application pending)
GND
5.89
0.51
40
000000FBC52B
Snap-In Fob
F5 MicroCan
Self-Stick Adhesive Pad
Multi-Purpose Clip
Mounting Lock Ring
iButton Probe
1-Wire
RTC iButton
24
DS1904
16.25
17.35

Related parts for DS1904L-F5#

DS1904L-F5# Summary of contents

Page 1

... Class I, Division 1, Group and D Locations (application pending) F5 MicroCan 5.89 0.51 IO GND All dimensions are shown in millimeters ORDERING INFORMATION ® DS1904L-F5# ® # Denotes an RoHS-compliant device that may include lead(Pb) that is exempt under the RoHS requirements. EXAMPLES OF ACCESSORIES DS9096P DS9101 DS9093RA DS9093A DS9092 ...

Page 2

Accessories permit the DS1904 to be mounted on almost any surface including printed circuit boards and plastic key fobs. The DS1904 adds functions such as calendar, time and date stamp, stopwatch, hour meter, ...

Page 3

HIERARCHICAL STRUCTURE FOR 1-WIRE PROTOCOL Figure 2 Bus Master Command Level 1-Wire ROM Function Commands (see Figure 7) DS1904 specific Function Commands (see Figure 5) 64-BIT LASERED ROM Figure 3 MSB 8-Bit CRC Code MSB LSB 1-WIRE CRC GENERATOR Figure ...

Page 4

TIMEKEEPING A 32.768 kHz crystal oscillator is used as the time base for the real-time clock counter. The oscillator can be turned on or off under software control. The oscillator must be on for the real time clock to function. ...

Page 5

CLOCK FUNCTION COMMAND FLOW CHART Figure 5 Master TX Control Function Command 66H Read Clock ? Y DS1904 copies RTC Counter to R/W Buffer Bus Master RX Device Control Byte Bus Master RX LS Byte (7:0) Bus Master RX next ...

Page 6

READ CLOCK [66h] The read clock command is used to read the device control byte and the contents of the real-time clock counter. After having received the most significant bit of the command code the device copies the actual contents ...

Page 7

The idle state for the 1-Wire bus is high. If for any reason a transaction needs to be suspended, the bus MUST be left in the idle state if the transaction is to resume. If this does not occur and ...

Page 8

ROM FUNCTIONS FLOW CHART Figure 7 33H N Read ROM Command ? Y DS1904 TX Family Code 1 Byte DS1904 TX Serial Number 6 Bytes DS1904 TX CRC Byte Master TX Reset Pulse DS1904 TX Presence Pulse Master TX ROM ...

Page 9

Skip ROM [CCh] This command can save time in a single drop bus system by allowing the bus master to access the clock functions without providing the 64-bit ROM code. If more than one slave is present on the bus ...

Page 10

READ/WRITE TIMING DIAGRAM Figure 9 Write-one Time Slot V PULLUP V PULLUP MIN V IH MIN V IL MAX 0V RESISTOR MASTER Write-zero Time Slot V PULLUP V PULLUP MIN V IH MIN V IL MAX 0V RESISTOR MASTER Read-data ...

Page 11

PHYSICAL SPECIFICATION Size Weight Expected Service Life Safety ABSOLUTE MAXIMUM RATINGS* Voltage on 1-Wire to Ground Operating Temperature Storage Temperature * This is a stress rating only and functional operation of the device at these or any other conditions above ...

Page 12

NOTES: 1. All voltages are referenced to ground external pull-up voltage. PUP 3. Input load is to ground. 4. Read data setup time refers to the time the host must pull the 1-Wire bus low to read ...

Page 13

REVISION HISTORY REVISION DATE 2/00 Initial release. Added # to the Ordering Information to reflect the conversion to a RoHS-compliant 8/09 product. DESCRIPTION PAGES CHANGED — 1 ...

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