1DS1995(3)                    One-Wire File System                    DS1995(3)
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NAME

6       DS1995 - 16kbit Memory iButton
7

SYNOPSIS

9       Non-volatile memory.
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11       0A  [.]XXXXXXXXXXXX[XX][/[  memory  | pages/page.[0-63|ALL] | address |
12       crc8 | id | locator | r_address | r_id | r_locator | type ]]
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FAMILY CODE

15       0A     DS1996
16

SPECIAL PROPERTIES

18   memory
19       read-write, binary
20       2048 bytes of memory.
21
22   pages/page.0 ... pages/page.63 pages/page.ALL
23       read-write, binary
24       Memory is split into 64 pages of 32 bytes each.  ALL is an aggregate of
25       the pages. Each page is accessed sequentially.
26

STANDARD PROPERTIES

28   address
29   r_address
30       read-only, ascii
31       The  entire  64-bit  unique  ID. Given as upper case hexidecimal digits
32       (0-9A-F).
33       address starts with the family code
34       r address is the address in reverse order, which is often used in other
35       applications and labeling.
36
37   crc8
38       read-only, ascii
39       The  8-bit error correction portion. Uses cyclic redundancy check. Com‐
40       puted from the preceding 56 bits of the  unique  ID  number.  Given  as
41       upper case hexadecimal digits (0-9A-F).
42
43   family
44       read-only, ascii
45       The  8-bit  family  code. Unique to each type of device. Given as upper
46       case hexadecimal digits (0-9A-F).
47
48   id
49   r_id
50       read-only, ascii
51       The 48-bit middle portion of the unique ID number. Does not include the
52       family code or CRC. Given as upper case hexadecimal digits (0-9A-F).
53       r  id is the id in reverse order, which is often used in other applica‐
54       tions and labeling.
55
56   locator
57   r_locator
58       read-only, ascii
59       Uses an extension of the 1-wire design from  iButtonLink  company  that
60       associated  1-wire  physical  connections with a unique 1-wire code. If
61       the connection is behind a Link Locator the locator will show a  unique
62       8-byte number (16 character hexadecimal) starting with family code FE.
63       If  no  Link  Locator is between the device and the master, the locator
64       field will be all FF.
65       r locator is the locator in reverse order.
66
67   present (DEPRECATED)
68       read-only, yes-no
69       Is the device currently present on the 1-wire bus?
70
71   type
72       read-only, ascii
73       Part name assigned by Dallas Semi. E.g.  DS2401  Alternative  packaging
74       (iButton vs chip) will not be distiguished.
75

ALARMS

77       None.
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DESCRIPTION

80   1-Wire
81       1-wire is a wiring protocol and series of devices designed and manufac‐
82       tured by Dallas Semiconductor, Inc. The bus is  a  low-power  low-speed
83       low-connector scheme where the data line can also provide power.
84
85       Each  device  is  uniquely and unalterably numbered during manufacture.
86       There are a wide variety of devices, including memory, sensors  (humid‐
87       ity, temperature, voltage, contact, current), switches, timers and data
88       loggers. More complex devices (like thermocouple sensors) can be  built
89       with  these  basic  devices.  There  are  also 1-wire devices that have
90       encryption included.
91
92       The 1-wire scheme uses a single bus master and multiple slaves  on  the
93       same  wire.  The bus master initiates all communication. The slaves can
94       be individually discovered and addressed using their unique ID.
95
96       Bus masters come in a variety of configurations including serial,  par‐
97       allel, i2c, network or USB adapters.
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99   OWFS design
100       OWFS  is  a  suite of programs that designed to make the 1-wire bus and
101       its devices easily accessible. The underlying principle is to create  a
102       virtual  filesystem,  with  the  unique ID being the directory, and the
103       individual properties of the device are  represented  as  simple  files
104       that can be read and written.
105
106       Details  of  the  individual slave or master design are hidden behind a
107       consistent interface. The goal is to provide an easy set of tools for a
108       software  designer  to create monitoring or control applications. There
109       are some performance enhancements in the implementation, including data
110       caching, parallel access to bus masters, and aggregation of device com‐
111       munication. Still the fundamental goal has been ease of use,  flexibil‐
112       ity and correctness rather than speed.
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114   DS1995
115       The  DS1995  (3) is an iButton with static memory. Data is read/written
116       with error checking (transparent to the user).  The DS1992 ,  DS1993  ,
117       DS1995  , and DS1996 differ in their function by the amount of on-board
118       memory they possess. (The internal protocols  are  slightly  different,
119       but the OWFS system handles this automatically.)
120

ADDRESSING

122       All  1-wire  devices are factory assigned a unique 64-bit address. This
123       address is of the form:
124
125       Family Code
126              8 bits
127
128       Address
129              48 bits
130
131       CRC    8 bits
132
133       Addressing under OWFS is in hexadecimal, of form:
134
135              01.123456789ABC
136
137       where 01 is an example 8-bit family code, and 12345678ABC is an example
138       48 bit address.
139
140       The  dot  is  optional,  and the CRC code can included. If included, it
141       must be correct.
142

DATASHEET

144       http://pdfserv.maxim-ic.com/en/ds/DS1995.pdf
145

SEE ALSO

147   Programs
148       owfs (1) owhttpd (1) owftpd (1)  owserver  (1)  owdir  (1)  owread  (1)
149       owwrite (1) owpresent (1) owtap (1)
150
151   Configuration and testing
152       owfs (5) owtap (1) owmon (1)
153
154   Language bindings
155       owtcl (3) owperl (3) owcapi (3)
156
157   Clocks
158       DS1427  (3)  DS1904  (3)  DS1994  (3) DS2404 (3) DS2404S (3) DS2415 (3)
159       DS2417 (3)
160
161   ID
162       DS2401 (3) DS2411 (3) DS1990A (3)
163
164   Memory
165       DS1982 (3) DS1985 (3) DS1986 (3)  DS1991  (3)  DS1992  (3)  DS1993  (3)
166       DS1995  (3)  DS1996  (3)  DS2430A  (3) DS2431 (3) DS2433 (3) DS2502 (3)
167       DS2506 (3) DS28E04 (3) DS28EC20 (3)
168
169   Switches
170       DS2405 (3) DS2406 (3) DS2408 (3) DS2409 (3) DS2413 (3) DS28EA00 (3)
171
172   Temperature
173       DS1822 (3) DS1825 (3) DS1820 (3) DS18B20 (3)  DS18S20  (3)  DS1920  (3)
174       DS1921  (3) DS1821 (3) DS28EA00 (3) DS28E04 (3) EDS0064 (3) EDS0065 (3)
175       EDS0066 (3) EDS0067 (3) EDS0068 (3) EDS0071 (3)  EDS0072  (3)  MAX31826
176       (3)
177
178   Humidity
179       DS1922 (3) DS2438 (3) EDS0065 (3) EDS0068 (3)
180
181   Voltage
182       DS2450 (3)
183
184   Resistance
185       DS2890 (3)
186
187   Multifunction (current, voltage, temperature)
188       DS2436  (3)  DS2437  (3)  DS2438  (3)  DS2751 (3) DS2755 (3) DS2756 (3)
189       DS2760 (3) DS2770 (3) DS2780 (3) DS2781 (3) DS2788 (3) DS2784 (3)
190
191   Counter
192       DS2423 (3)
193
194   LCD Screen
195       LCD (3) DS2408 (3)
196
197   Crypto
198       DS1977 (3)
199
200   Pressure
201       DS2406 (3) TAI8570 (3) EDS0066 (3) EDS0068 (3)
202
203   Moisture
204       EEEF (3) DS2438 (3)
205

AVAILABILITY

207       http://www.owfs.org
208

AUTHOR

210       Paul Alfille (paul.alfille@gmail.com)
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214OWFS Manpage                         2003                            DS1995(3)
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