Rainbow Electronics DS1990A - Manual

1 of 10 081999
DS1990A SPECIAL FEATURES
§ Upgrade of DS1990 allows multiple Serial
Number iButtons to reside on a common bus
§ Unique 48–bit serial number
§ 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
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 by momentary contact
§ Chip-based data carrier compactly stores
information
§ Data can be accessed while affixed to an
object
§ Economically communicates to bus master
with a single digital signal at 16.3k bits per
second
§ Standard 16 mm diameter and 1-Wire TM
protocol ensure compatibility with iButton
family
§ 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
§ 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
F3 MICROCAN
TM
F5 MICROCAN
TM
All dimensions shown in millimeters
ORDERING INFORMATION
DS1990A-F3 F3 MicroCan
DS1990A-F5 F5 MicroCan
EXAMPLES OF ACCESSORIES
DS9096P Self-Stick Adhesive Pad
DS9101 Multi-Purpose Clip
DS9093RA Mounting Lock Ring
DS9093F Snap-In Fob
DS9092 iButton Probe
DS1990A
Serial Number iButton
TM
www.dalsemi.com
DATA
GROUND
0.36
0.51
3.10
c 1993
YYWW REGISTERED RR
66 01
000000FBC52B
16.25
17.35
DATA
GROUND
0.36 0.51
5.89
c 1993
YYWW REGISTERED RR
E6 01
000000FBD8B3
16.25
17.35