1DS2436(3) One-Wire File System DS2436(3)
2
6 DS2436 - Battery ID/Monitor Chip
7
9 Temperature Voltage and Memory.
10 1B [.]XXXXXXXXXXXX[XX][/[ pages/page.[0-4|ALL] | temperature | volts |
12 counter/cycles | counter/reset | counter/increment | address | crc8 |
13 id | locator | r_address | r_id | r_locator | type ]]
14
16 1B
17
19 pages/page.0 ... pages/page.4 pages/page.ALL
20 read-write, binary
21 Memory is split into 5 pages of 32 bytes each. Only the first 3 pages
22 are really available, and some of that appears to be reserved. See the
23 datasheet for details.
24 pages/page.0 is locked and unlocked transparently for every write.
26 ALL is an aggregate of the pages. Each page is accessed sequentially.
28 temperature
30 read-only, floating point
31 Temperature read by the chip at high resolution (~13 bits). Units are
32 selected from the invoking command line. See owfs(1) or owhttpd(1) for
33 choices. Default is Celsius. Conversion takes ~20 msec.
34 volts
36 read-only, floating point
37 Voltage read (~10 bits) at the chip's supply voltage Vdd. Range 2.4V to
38 10V.
39 counter/
41 A resettable non-volatile counter intended for counting battery dis‐
42 charge cycles.
43 counter/cycles
45 read-only, unsigned integer
46 Cycle counter value. Stored at memory location 0x82.
47 counter/increment
49 write-only, yes/no
50 Any non-zero (true) value will increment counter/cycles by one.
51 counter/reset
53 write-only, yes/no
54 Any non-zero (true) value will reset counter/cycles to zero.
55
57 address
58 r_address
59 read-only, ascii
60 The entire 64-bit unique ID. Given as upper case hexidecimal digits
61 (0-9A-F).
62 address starts with the family code
63 r address is the address in reverse order, which is often used in other
64 applications and labeling.
65 crc8
67 read-only, ascii
68 The 8-bit error correction portion. Uses cyclic redundancy check. Com‐
69 puted from the preceding 56 bits of the unique ID number. Given as
70 upper case hexadecimal digits (0-9A-F).
71 family
73 read-only, ascii
74 The 8-bit family code. Unique to each type of device. Given as upper
75 case hexadecimal digits (0-9A-F).
76 id
78 r_id
79 read-only, ascii
80 The 48-bit middle portion of the unique ID number. Does not include the
81 family code or CRC. Given as upper case hexadecimal digits (0-9A-F).
82 r id is the id in reverse order, which is often used in other applica‐
83 tions and labeling.
84 locator
86 r_locator
87 read-only, ascii
88 Uses an extension of the 1-wire design from iButtonLink company that
89 associated 1-wire physical connections with a unique 1-wire code. If
90 the connection is behind a Link Locator the locator will show a unique
91 8-byte number (16 character hexadecimal) starting with family code FE.
92 If no Link Locator is between the device and the master, the locator
93 field will be all FF.
94 r locator is the locator in reverse order.
95 present (DEPRECATED)
97 read-only, yes-no
98 Is the device currently present on the 1-wire bus?
99 type
101 read-only, ascii
102 Part name assigned by Dallas Semi. E.g. DS2401 Alternative packaging
103 (iButton vs chip) will not be distiguished.
104
106 None.
107
109 1-Wire
110 1-wire is a wiring protocol and series of devices designed and manufac‐
111 tured by Dallas Semiconductor, Inc. The bus is a low-power low-speed
112 low-connector scheme where the data line can also provide power.
113 Each device is uniquely and unalterably numbered during manufacture.
115 There are a wide variety of devices, including memory, sensors (humid‐
116 ity, temperature, voltage, contact, current), switches, timers and data
117 loggers. More complex devices (like thermocouple sensors) can be built
118 with these basic devices. There are also 1-wire devices that have
119 encryption included.
120 The 1-wire scheme uses a single bus master and multiple slaves on the
122 same wire. The bus master initiates all communication. The slaves can
123 be individually discovered and addressed using their unique ID.
124 Bus masters come in a variety of configurations including serial, par‐
126 allel, i2c, network or USB adapters.
127 OWFS design
129 OWFS is a suite of programs that designed to make the 1-wire bus and
130 its devices easily accessible. The underlying principle is to create a
131 virtual filesystem, with the unique ID being the directory, and the
132 individual properties of the device are represented as simple files
133 that can be read and written.
134 Details of the individual slave or master design are hidden behind a
136 consistent interface. The goal is to provide an easy set of tools for a
137 software designer to create monitoring or control applications. There
138 are some performance enhancements in the implementation, including data
139 caching, parallel access to bus masters, and aggregation of device com‐
140 munication. Still the fundamental goal has been ease of use, flexibil‐
141 ity and correctness rather than speed.
142 DS2436
144 The DS2436 (3) is a simpler form of the DS2438 battery chip. It has no
145 counter, and only one voltage sensor.
146
148 All 1-wire devices are factory assigned a unique 64-bit address. This
149 address is of the form:
150 Family Code
152 8 bits
153 Address
155 48 bits
156 CRC 8 bits
158 Addressing under OWFS is in hexadecimal, of form:
160 01.123456789ABC
162 where 01 is an example 8-bit family code, and 12345678ABC is an example
164 48 bit address.
165 The dot is optional, and the CRC code can included. If included, it
167 must be correct.
168
170 http://pdfserv.maxim-ic.com/en/ds/DS2436.pdf
171
173 Programs
174 owfs (1) owhttpd (1) owftpd (1) owserver (1) owdir (1) owread (1)
175 owwrite (1) owpresent (1) owtap (1)
176 Configuration and testing
178 owfs (5) owtap (1) owmon (1)
179 Language bindings
181 owtcl (3) owperl (3) owcapi (3)
182 Clocks
184 DS1427 (3) DS1904 (3) DS1994 (3) DS2404 (3) DS2404S (3) DS2415 (3)
185 DS2417 (3)
186 ID
188 DS2401 (3) DS2411 (3) DS1990A (3)
189 Memory
191 DS1982 (3) DS1985 (3) DS1986 (3) DS1991 (3) DS1992 (3) DS1993 (3)
192 DS1995 (3) DS1996 (3) DS2430A (3) DS2431 (3) DS2433 (3) DS2502 (3)
193 DS2506 (3) DS28E04 (3) DS28EC20 (3)
194 Switches
196 DS2405 (3) DS2406 (3) DS2408 (3) DS2409 (3) DS2413 (3) DS28EA00 (3)
197 Temperature
199 DS1822 (3) DS1825 (3) DS1820 (3) DS18B20 (3) DS18S20 (3) DS1920 (3)
200 DS1921 (3) DS1821 (3) DS28EA00 (3) DS28E04 (3) EDS0064 (3) EDS0065 (3)
201 EDS0066 (3) EDS0067 (3) EDS0068 (3) EDS0071 (3) EDS0072 (3) MAX31826
202 [1m(3)
203 Humidity
205 DS1922 (3) DS2438 (3) EDS0065 (3) EDS0068 (3)
206 Voltage
208 DS2450 (3)
209 Resistance
211 DS2890 (3)
212 Multifunction (current, voltage, temperature)
214 DS2436 (3) DS2437 (3) DS2438 (3) DS2751 (3) DS2755 (3) DS2756 (3)
215 DS2760 (3) DS2770 (3) DS2780 (3) DS2781 (3) DS2788 (3) DS2784 (3)
216 Counter
218 DS2423 (3)
219 LCD Screen
221 LCD (3) DS2408 (3)
222 Crypto
224 DS1977 (3)
225 Pressure
227 DS2406 (3) TAI8570 (3) EDS0066 (3) EDS0068 (3)
228 Moisture
230 EEEF (3) DS2438 (3)
231
233 http://www.owfs.org
234
236 Paul Alfille (paul.alfille@gmail.com)
237OWFS Manpage 2003 DS2436(3)