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PDF DS1994 Data sheet ( Hoja de datos )
| Número de pieza | DS1994 | |
| Descripción | 4kb Plus Time Memory iButton | |
| Fabricantes | Dallas Semiconductor | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de DS1994 (archivo pdf) en la parte inferior de esta página. Total 22 Páginas | ||
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DS1994
4kb Plus Time Memory iButton
www.iButton.com
SPECIAL FEATURES
§ 4096 bits of Read/Write Nonvolatile
Memory
§ 256-bit Scratchpad Ensures Integrity of Data
Transfer
§ Memory Partitioned into 256-bit Pages for
Packetizing Data
www.DataSh§eet4DU.acotamIntegrity Assured with Strict
Read/Write Protocols
§ Contains Real-Time Clock/Calendar in
Binary Format
§ Interval Timer Can Automatically
Accumulate Time When Power is Applied
§ Programmable Cycle Counter can
Accumulate the Number of System Power-
On/Off Cycles
§ Programmable Alarms Can Be Set to
Generate Interrupts for Interval Timer, Real-
Time Clock, and/or Cycle Counter
§ Write-Protect Feature Provides Tamperproof
Time Data
§ Programmable Expiration Date That Limits
Access to SRAM and Timekeeping
§ Clock Accuracy is Better Than ±2 Minutes/
Month at 25°C
§ Operating Temperature Range from -40°C to
+70°C
§ Over 10 Years of Data Retention
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
Information
§ Data Can Be Accessed While Affixed to
Object
§ Economically Communicates to Bus Master
with a Single Digital Signal at 16.3kbps
§ Standard 16mm Diameter and 1-Wire®
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 I, Division 1, Group A, B, C
and D Locations
F5 MICROCAN
5.89
0.36 0.51
© 1993
YYWW REGISTERED RR
61 04
000000FBD804
16.25
17.35
IO
GND
All dimensions shown in millimeters.
ORDERING INFORMATION
DS1994L-F5
F5 MicroCan
iButton and 1-Wire are registered trademarks of Dallas Semiconductor.
1 of 22
031403
1 page  
Figure 4. DS1994 MEMORY MAP
DS1994
SCRATCHPAD
www.DataSheet4U.com
MEMORY
PAGE
PAGE 0
PAGE 1
PAGE 2
PAGE 3
PAGE 4
PAGE 5
PAGE 6
PAGE 7
PAGE 8
PAGE 9
PAGE 10
PAGE 11
PAGE 12
PAGE 13
PAGE 14
PAGE 15
PAGE 16
0000h
0020h
0040h
0060h
0080h
00A0h
00C0h
00E0h
0100h
0120h
0140h
0160h
0180h
01A0h
01C0h
01E0h
0200h
NOTE: Each page is 32 bytes (256 bits). The hex values
represent the starting address for each page or register.
PAGE 16
TIMEKEEPING REGISTERS
STATUS REGISTER
CONTROL REGISTER
REAL-TIME
COUNTER REGISTERS
INTERVAL TIME
COUNTER REGISTERS
CYCLE
COUNTER REGISTERS
REAL-TIME
ALARM REGISTERS
INTERVAL TIME
ALARM REGISTERS
CYCLE
ALARM REGISTERS
0200h
0201h
0202h
0207h
020Ch
0210h
0215h
021Ah
STATUS REGISTER
7 6 54 3 2 1 0
X X CCE ITE RTE CCF ITF RTF 0200h
CONTROL REGISTER
7 65
DSEL
STOP AUTO
START MAN
4
OSC
321 0
RO WPC WPI WPR
0201h
5 of 22
5 Page 
Figure 6. MEMORY FUNCTIONS FLOWCHART (continued)
DS1994
From Figure 6
First Part
C5o5pHy
Scratchpad
?Y
Bus Master TX
TA1 (T7:T0)
N
www.DataSheet4U.com
Bus Master TX
TA2 (T15:T8)
Bus Master TX
E/S Byte
Auth.
Code Match
?
Y
AA = 1
N
DS1994 TX "1"s
DS1994 Copies
Scratchpad Data
To Memory
DS1994 TX "0"s
N Bus Master
TX Reset
?
Y
F0H Y
Read Memory
N?
Bus Master TX
TA1 (T7:T0)
Bus Master TX
TA2 (T15:T8)
DS1994 sets Memory
Address = (T15:T0)
Master RX Data
Byte From
Memory Address
DS1994
Increments
Address Counter
Y
Bus Master
TX Reset
?N
Bus Master
TX Reset
?
Y
N
N Memory
Address
= 21Dh ?
Y
Bus Master
RX "1"s
To Figure 6
First Part
11 of 22
11 Page | ||
| Páginas | Total 22 Páginas | |
| PDF Descargar | [ Datasheet DS1994.PDF ] | |
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