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PDF DS1986 Data sheet ( Hoja de datos )
| Número de pieza | DS1986 | |
| Descripción | 64-kbits Add-Only iButton | |
| Fabricantes | Dallas Semiconductor | |
| Logotipo |  |
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DS1986
64-kbits Add-Only iButtonTM
www.iButton.com
SPECIAL FEATURES
§ 65536 bits Electrically Programmable Read
Only Memory (EPROM) communicates with
the economy of one signal plus ground
§ Overdrive mode boosts communication
speed to 142 kbits per second
www.DataSh§eet4EUP.coRmOM partitioned into two hundred and 56
256-bit pages for randomly accessing
packetized data records
§ Each memory page can be permanently
write-protected to prevent tampering
§ Device is an “add only” memory where
additional data can be programmed into
EPROM without disturbing existing data
§ Architecture allows software to patch data by
superseding an old page in favor of a newly
programmed page
§ Reduces control, address, data, power, and
programming signals to a single data pin
§ 8-bit family code specifies DS1986
communications requirements to reader
§ Reads over a wide voltage range of 2.8V to
6.0V from -40°C to +85°C; programs at
11.5V to 12.0V from -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
F3 MICROCAN
0.36
3.10
0.51
c 1993
YYWW REGISTERED RR
19 OF
000000FBC52B
16.25
17.35
§ 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 16.3 kbits per
second
§ Standard 16 mm 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 (application pending)
F5 MICROCAN
5.89
0.36
0.51
c 1993
YYWW REGISTERED RR
99 0F
000000FBD8B3
16.25
17.35
DATA
GROUND
DATA
GROUND
All dimensions shown in millimeters.
1 of 27
011800
1 page  
HIERARCHICAL STRUCTURE FOR 1-WIRE PROTOCOL Figure 2
BUS
MASTER
1-WIRE BUS
DS1986
OTHER
DEVICES
www.DataSheet4U.com
COMMAND
LEVEL:
1-WIRE ROM FUNCTION
COMMANDS (SEE FIGURE 9)
DS1986
AVAILABLE
COMMANDS:
DATA FIELD
AFFECTED:
READ ROM
MATCH ROM
SEARCH ROM
SKIP ROM
OVERDRIVE SKIP ROM
OVERDRIVE MATCH ROM
64-BIT ROM
64-BIT ROM
64-BIT ROM
N/A
N/A
64-BIT ROM
DS1986 - SPECIFIC
MEMORY FUNCTION
COMMANDS
(SEE FIGURE 6)
WRITE MEMORY
WRITE STATUS
READ MEMORY
READ STATUS
EXTENDED READ DATA
64K BIT EPROM
EPROM STATUS BYTES
64K BIT EPROM
EPROM STATUS BYTES
64K BIT EPROM
64-BIT LASERED ROM Figure 3
8- Bit CRC Code
48- Bit Serial Number
8- Bit Family Code (0FH)
MSB
LSB MSB
LSB MSB
LSB
65536-BITS EPROM
The memory map in Figure 4 shows the 65536-bit EPROM section of the DS1986 which is configured as
256 pages of 32 bytes each. The 8-bit scratchpad is an additional register that acts as a buffer when
programming the memory. Data is first written to the scratchpad and then verified by reading an 16-bit
CRC from the DS1986 that confirms proper receipt of the data and address. If the buffer contents are
correct, a programming voltage should be applied and the byte of data will be written into the selected
address in memory. This process ensures data integrity when programming the memory. The details for
reading and programming the 65536-bit EPROM portion of the DS1986 are given in the Memory
Function Commands section.
5 of 27
5 Page 
MEMORY FUNCTION FLOW CHART Figure 5 (cont.)
DS1986
www.DataSheet4U.com
1), 2) SEE PREVIOUS PAGE
11 of 27
11 Page | ||
| Páginas | Total 27 Páginas | |
| PDF Descargar | [ Datasheet DS1986.PDF ] | |
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