DS1990A
Serial Number iButtonTM
www.dalsemi.com
DS1990A SPECIAL FEATURES
§ Upgrade of DS1990 allows multiple Serial
Number iButtons to reside on a common bus
§ Unique 48–bit serial number
F3 MICROCANTM
3.10
0.36
0.51
c
§ Low-cost electronic key for access control
§ 8-bit CRC for checking data integrity
§ Can be read in less than 5 ms
§ Operating temperature range of -40°C to
+85°C
1993
16.25
YYWW REGISTERED RR
01
000000FBC52B
66
17.35
DATA
GROUND
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
F5 MICROCANTM
5.89
0.36
0.51
§ Multidrop controller for MicroLAN
§ Digital identification by momentary contact
§ Chip-based data carrier compactly stores
information
c
1993
16.25
YYWW REGISTERED RR
01
E6
17.35
000000FBD8B3
§ Data can be accessed while affixed to an
object
DATA
§ Economically communicates to bus master
with a single digital signal at 16.3k bits per
second
GROUND
§ Standard 16 mm diameter and 1-WireTM
protocol ensure compatibility with iButton
family
All dimensions shown in millimeters
ORDERING INFORMATION
DS1990A-F3
DS1990A-F5
F3 MicroCan
F5 MicroCan
§ Button shape is self-aligning with cup-
shaped probes
§ Durable stainless steel case engraved with
registration number withstands harsh
environments
§ Easily affixed with self-stick adhesive
backing, latched by its flange, or locked with
a ring pressed onto its rim
EXAMPLES OF ACCESSORIES
DS9096P
DS9101
Self-Stick Adhesive Pad
Multi-Purpose Clip
Mounting Lock Ring
Snap-In Fob
DS9093RA
DS9093F
DS9092
iButton Probe
§ Presence detector acknowledges when reader
first applies voltage
§ Meets UL#913 (4th Edit.); Intrinsically Safe
Apparatus, Approved under Entity Concept
for use in Class 1, Division 1, Group A, B, C
and D locations
1 of 10
081999