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NAME

       DS2760, DS2761, DS2762 - High-Precision Li+ Battery Monitor

SYNOPSIS

   Temperature Voltage and Current.
       30  [.]XXXXXXXXXXXX[XX][/[  amphours  |  current | currentbias | lock.[0-1|ALL] | memory |
       pages/page.[0-1|ALL] | PIO | sensed | temperature | vbias | vis | volt | volthours |
       cc | ce | coc | defaultpmod | defaultswen | dc | de | doc | mstr | ov | ps | pmod | swen |
       uv |
       address | crc8 | id | locator | r_address | r_id | r_locator | type ]]

   Thermocouple
       30   [.]XXXXXXXXXXXX[XX][/[   temperature   |   typeX/range_low   |   typeX/range_high   |
       typeX/temperature ]]

   Weather Station
       30  [.]XXXXXXXXXXXX[XX][/[  WS603/temperature  |  WS603/wind_speed  |  WS603/direction   |
       WS603/volt |
       WS603/LED/status | WS603/LED/control.ALL | WS603/LED/model |
       WS603/calibrationwind_speed | WS603/calibration/direction |
       WS603/light/intensity | WS603/light/threshold

FAMILY CODE

       30

SPECIAL PROPERTIES

   amphours
       read-write, floating point
       Accumulated  amperage read by current sensor. Units are in Amp-hr (Assumes internal 25mOhm
       resistor). Derived from volthours / Rinternal.
       Formally amphours is the integral of current - currentbias over time.

   current
       read-only, floating point
       Current reading. Units are in Amp (Assumes internal 25 mOhm resistor). Derived from vis  /
       Rinternal.

   currentbias
       read-write, floating point
       Fixed  offset  applied  to  each  current measurement. Used in the amphours value. Assumes
       internal 25mOhm resistor. Units are Amp and range from -.08A to .08A.
       Derived from vbias / Rinternal.

   lock.[0-1|ALL]
       read-write, yes-no
       Lock either of the two eprom pages to prevent further writes. Apparently setting  lock  is
       permanent.

   memory
       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.

   pages/pages.[0-1|ALL]
       read-write, binary Two 16 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.

   PIO
       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.

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

   temperature
       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.

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

   vis
       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.

   volt
       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

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

THERMOCOUPLE

   typeX/
       directory
       Thermocouple  circuit  using  the  DS2760  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.

   typeX/temperature
       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.

WEATHER STATION

   WS603
       directory
       Weather  station  from  AAG  electronica  that  includes  temperature,  wind  speed,  wind
       direction, light sensor and LED lights.

   WS603/temperature
       read-only, floating-point
       Uses  the DS2760 temperature sensor. This is equivalent to the temperature value. Again in
       the specificed temperature scale, default Celsius.

   WS603/wind_speed
       read_only, floating-point
       Readings from the anometer, scaled using the WS603/calibration/wind_speed

   WS603/direction
       read_only, unsigned integer
       Wind direction, using the following table

       1      N

       2      NNE

       3      NE

       4      NEE

       5      E

       6      EES

       7      ES

       8      ESS

       9      S

       10     SSW

       11     SW

       12     SWW

       13     W

       14     WWN

       15     WN

       16     WWN

       Values are adjusted (internally) by the WS603/calibration/direction property

   WS603/volt
       read-only, unsigned integer
       Voltage value from the WS603 device. Units and significance is unclear.

   WS603/calibration/wind_speed
       read-write, unsigned integer
       Value between 1 and 200 for wind speed scaling. Values on of this range  are  ignored  and
       the default value of 100 used.

   WS603/calibration/direction
       read-write, unsigned integer
       Adjustment of wind direction. See datasheet.

   WS603/light/intensity
       read-only, unsigned integer
       Uncalibrated value from an internal light sensor. Used for control of LED display (daytime
       vs nighttime).

   WS603/light/threshold
       read-only, unsigned integer
       Threshold for internal  light  sensor.  Used  for  control  of  LED  display  (daytime  vs
       nighttime).

       Value is set as value 4 of the array passed to WS603/LED/control

   WS603/LED/status
       read-only, unsigned integer
       Status of LED lights intensities. See datasheet.

       Value is set as values 2 and 3 of the array passed to WS603/LED/control

   WS603/LED/model
       read-only, unsigned integer
       What factors control LED display. See datasheet.

       Value is set as value 1 of the array passed to WS603/LED/control.ALL

   WS603/LED/model
       write-only, unsigned integer array of 4 values
       Four integers sent to control LED display. All four values must be sent, comma separated.

       0      Light mode

       1      Light status

       2      Light level

       3      Light threshold

OBSCURE PROPERTIES

   cc ce coc dc de doc mstr ov pmod swen uv
       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
       value.

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

STANDARD PROPERTIES

   address
   r_address
       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
       labeling.

   crc8
       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-
       F).

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

   id
   r_id
       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.

   locator
   r_locator
       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?

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

ALARMS

       None.

DESCRIPTION

   1-Wire
       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 priciple 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.

   DS2760 DS2761 DS2762
       The  DS2760  (3)  is  a  class  of  battery charging controllers. There are minor hardware
       difference  between  the  DS2760,  DS2761  and  DS2762  battery   chip,   but   they   are
       indistiguishable to the software.

       A  number  of  interesting  devices  can be built with the DS276x including thermocouples.
       Support for thermocouples in built into the software, using the embedded thermister as the
       cold junction temperature.

       For  an explanation of the differences between the DS276x variants, see Dallas Application
       Note 221.

ADDRESSING

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

       Family Code
              8 bits

       Address
              48 bits

       CRC    8 bits

       Addressing under OWFS is in hexidecimal, of form:

              01.123456789ABC

       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.

DATASHEET

       http://pdfserv.maxim-ic.com/en/ds/DS2760.pdf
       http://pdfserv.maxim-ic.com/en/an/app221.pdf
       http://www.aag.com.mx/aagusa/contents/en-
       us/Description%20of%20WSV3%20Interface%20(1-wire).pdf

SEE ALSO

   Programs
       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)

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

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

   Memory
       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)

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

   Temperature
       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)

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

   Voltage
       DS2450 (3)

   Resistance
       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)

   Counter
       DS2423 (3)

   LCD Screen
       LCD (3) DS2408 (3)

   Crypto
       DS1977 (3)

   Pressure
       DS2406 (3) -- TAI8570 EDS0066 (3) EDS0068 (3)

AVAILABILITY

       http://www.owfs.org

AUTHOR

       Paul Alfille (paul.alfille@gmail.com)