Provided by: owfs-doc_3.1p1-2ubuntu1_all bug


       DS2755, DS2756 - Multichemistry Battery Fuel Gauge


   Temperature Voltage, Current, Memory, and Switch.
       35 [.]XXXXXXXXXXXX[XX][/[ alarm_set/[volthigh|voltlow|temphigh|templow] | lock.[0-2|ALL] |
       memory | pages/page.[0-2|ALL] | PIO | sensed  |  temperature  |  vbias  |  vis  |  volt  |
       volthours |
       defaultpmod | pie0 | pie1 | rnaop | ios | uben | ovd | pmod | por | uven |
       address | crc8 | id | locator | r_address | r_id | r_locator | type ]]

       35   [.]XXXXXXXXXXXX[XX][/[   temperature   |   typeX/range_low   |   typeX/range_high   |




   alarm_set/templow alarm_set/temphigh
       read-write, integer
       High and low alarm settings for temperature

   alarm_set/voltlow alarm_set/volthigh
       read-write, floating point
       High and low alarm settings for volts

       read-write, yes-no
       Lock any of the three eprom pages to prevent further writes. Apparently  setting  lock  is

       read-write, binary
       Access  to  the full 256 byte memory range. Much of this space is reserved or special use.
       User space is the page area.
       See the DATASHEET for a full memory map.

       read-write, binary Three 32 byte areas of memory for user application. The  lock  property
       can prevent further alteration.
       NOTE  that  the page property is different from the common OWFS implementation in that all
       of memory is not accessible.

       write-only, yes-no
       Controls the PIO pin allowing external switching.
       Writing "1" turns the PIO pin on (conducting). Writing "0" makes the  pin  non-conducting.
       The  logical  state of the voltage can be read with the sensed property. This will reflect
       the current voltage at the pin, not the value sent to PIO
       Note also that PIO will also be  altered  by  the  power-status  of  the  DS2670  See  the
       datasheet for details.

       read-only, yes-no
       The  logical  voltage  at the PIO pin. Useful only if the PIO property is set to "0" (non-
       Value will be 0 or 1 depending on the voltage threshold.

       read-only, floating point
       Temperature read by the chip at high resolution (~13 bits). Units are  selected  from  the
       invoking command line. See owfs(1) or owhttpd(1) for choices. Default is Celsius.
       Conversion is continuous.

       read-write, floating point
       Fixed  offset  applied to each vis measurement. Used for the volthours value. Units are in
       Range -2.0mV to 2.0mV

       read-only, floating point
       Current sensor reading (unknown external resistor). Measures the voltage gradient  between
       the Vis pins. Units are in Volts
       The vis readings are integrated over time to provide the volthours property.
       The  current  reading  is  derived  from  vis  assuming  the  internal 25 mOhm resistor is
       employed. There is no way to know this through software.

       read-only, floating point
       Voltage read at the voltage sensor;. This is separate from the vis voltage  that  is  used
       for current measurement. Units are Volts
       Range is between 0 and 4.75V

       read-write, floating point
       Integral of vis - vbias over time. Units are in volthours


       Thermocouple  circuit  using  the  DS2755  to  read  the Seebeck voltage and the reference
       temperature. Since the type interpretation of the values  read  depends  on  the  type  of
       thermocouple,  the  correct directory must be chosen. Supported thermocouple types include
       types B, E, J, K, N, R, S and T.

   typeX/range_low typeX/ranges_high
       read-only, flaoting point
       The lower and upper temperature supported by this thermocouple (at least by the conversion
       routines). In the globally chosen temperature units.

       read-only, floating point
       Thermocouple  temperature.  Requires  a  voltage  and  temperature conversion. Returned in
       globally chosen temperature units.
       Note: there are two types of temperature measurements possible. The temperature  value  in
       the   main   device  directory  is  the  reference  temperature  read  at  the  chip.  The
       typeX/temperature value is at the thermocouple junction, probably remote from the chip.


   pmod por uven pie0 pie1 ios uben ovd rnaop
       varies, yes-no
       Bit flags corresponding to various battery management  functions  of  the  chip.  See  the
       DATASHEET for details of the identically named entries.
       In  general, writing "0" corresponds to a 0 bit value, and non-zero corresponds to a 1 bit

       read-write, yes-no
       Default power-on state for the corresponding properties.


       read-only, ascii
       The entire 64-bit unique ID. Given as upper case hexidecimal digits (0-9A-F).
       address starts with the family code
       r address is the address in reverse order, which is often used in other  applications  and

       read-only, ascii
       The  8-bit  error  correction  portion.  Uses  cyclic  redundancy check. Computed from the
       preceding 56 bits of the unique ID number. Given as upper case hexidecimal  digits  (0-9A-

       read-only, ascii
       The  8-bit  family  code.  Unique  to each type of device. Given as upper case hexidecimal
       digits (0-9A-F).

       read-only, ascii
       The 48-bit middle portion of the unique ID number. Does not include  the  family  code  or
       CRC. Given as upper case hexidecimal digits (0-9A-F).
       r id is the id in reverse order, which is often used in other applications and labeling.

       read-only, ascii
       Uses  an  extension  of  the 1-wire design from iButtonLink company that associated 1-wire
       physical connections with a unique 1-wire code. If the connection is behind a Link Locator
       the  locator  will  show  a  unique 8-byte number (16 character hexidecimal) starting with
       family code FE.
       If no Link Locator is between the device and the master, the locator field will be all FF.
       r locator is the locator in reverse order.

   present (DEPRECATED)
       read-only, yes-no
       Is the device currently present on the 1-wire bus?

       read-only, ascii
       Part name assigned by Dallas Semi. E.g.  DS2401 Alternative packaging  (iButton  vs  chip)
       will not be distiguished.


       Temperature and voltage.


       1-wire  is  a  wiring  protocol  and series of devices designed and manufactured by Dallas
       Semiconductor, Inc. The bus is a low-power low-speed low-connector scheme where  the  data
       line can also provide power.

       Each  device  is  uniquely  and  unalterably numbered during manufacture. There are a wide
       variety of devices, including memory, sensors (humidity,  temperature,  voltage,  contact,
       current),  switches,  timers  and  data  loggers.  More complex devices (like thermocouple
       sensors) can be built with these basic devices. There are also 1-wire  devices  that  have
       encryption included.

       The  1-wire  scheme uses a single bus master and multiple slaves on the same wire. The bus
       master initiates  all  communication.  The  slaves  can  be  individually  discovered  and
       addressed using their unique ID.

       Bus  masters  come in a variety of configurations including serial, parallel, i2c, network
       or USB adapters.

   OWFS design
       OWFS is a suite of programs that designed to make the 1-wire bus and  its  devices  easily
       accessible. The underlying principle is to create a virtual filesystem, with the unique ID
       being the directory, and the individual properties of the device are represented as simple
       files that can be read and written.

       Details of the individual slave or master design are hidden behind a consistent interface.
       The goal is to provide an easy set of tools for a software designer to  create  monitoring
       or  control  applications.  There are some performance enhancements in the implementation,
       including data caching,  parallel  access  to  bus  masters,  and  aggregation  of  device
       communication.  Still  the  fundemental  goal  has  been  ease  of  use,  flexibility  and
       correctness rather than speed.

   DS2755 DS2756
       The DS2755 (3) and DS2756 (3) are battery charging controllers similar to the  DS2751  (3)
       except no internal resistor option and a larger EEPROM memory.

       The DS2756 (3) adds suspend modes ( pie0 pie1 ) to the DS2755 (3)

       A  number of interesting devices can be built with the DS2755 (3) and DS2756 (3) including
       thermocouples. Support for thermocouples in built into the software,  using  the  embedded
       thermister as the cold junction temperature.


       All  1-wire  devices  are factory assigned a unique 64-bit address. This address is of the

       Family Code
              8 bits

              48 bits

       CRC    8 bits

       Addressing under OWFS is in hexidecimal, of form:


       where 01 is an example 8-bit family code, and 12345678ABC is an example 48 bit address.

       The dot is optional, and the CRC code can included. If included, it must be correct.



       owfs (1) owhttpd (1) owftpd (1) owserver (1) owdir (1) owread (1)  owwrite  (1)  owpresent
       (1) owtap (1)

   Configuration and testing
       owfs (5) owtap (1) owmon (1)

   Language bindings
       owtcl (3) owperl (3) owcapi (3)

       DS1427 (3) DS1904(3) DS1994 (3) DS2404 (3) DS2404S (3) DS2415 (3) DS2417 (3)

       DS2401 (3) DS2411 (3) DS1990A (3)

       DS1982  (3)  DS1985  (3) DS1986 (3) DS1991 (3) DS1992 (3) DS1993 (3) DS1995 (3) DS1996 (3)
       DS2430A (3) DS2431 (3) DS2433 (3) DS2502 (3) DS2506 (3) DS28E04 (3) DS28EC20 (3)

       DS2405 (3) DS2406 (3) DS2408 (3) DS2409 (3) DS2413 (3) DS28EA00 (3)

       DS1822 (3) DS1825 (3) DS1820 (3) DS18B20 (3) DS18S20 (3) DS1920 (3) DS1921 (3) DS1821  (3)
       DS28EA00  (3)  DS28E04  (3)  EDS0064  (3)  EDS0065 (3) EDS0066 (3) EDS0067 (3) EDS0068 (3)
       EDS0071 (3) EDS0072 (3) MAX31826 (3)

       DS1922 (3) DS2438 (3) EDS0065 (3) EDS0068 (3)

       DS2450 (3)

       DS2890 (3)

   Multifunction (current, voltage, temperature)
       DS2436 (3) DS2437 (3) DS2438 (3) DS2751 (3) DS2755 (3) DS2756 (3) DS2760  (3)  DS2770  (3)
       DS2780 (3) DS2781 (3) DS2788 (3) DS2784 (3)

       DS2423 (3)

   LCD Screen
       LCD (3) DS2408 (3)

       DS1977 (3)

       DS2406 (3) TAI8570 EDS0066 (3) EDS0068 (3)

       EEEF (3) DS2438 (3)



       Paul Alfille (