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DS2437(3)                    One-Wire File System                    DS2437(3)


NAME

       DS2437 - Smart Battery Monitor


SYNOPSIS

       Temperature Voltages and Memory.

       1E [.]XXXXXXXXXXXX[XX][/[ current | date | disconnect/date |
       disconnect/udate | endcharge/date | endcharge/udate | Ienable |
       pages/page.[0-7|ALL] | temperature | udate | VAD | VDD |

       See the file man3/standard_mini.3so.

       ]]


FAMILY CODE

       1E


SPECIAL PROPERTIES

   date
       read-write, ascii
       26 character date representation of the counter value. Increments once
       per second.
       Setting date to a null string will put the current system time.
       Accepted date formats are:
         Sat[urday] March 12 12:23:59 2001
         Apr[il] 4 9:34:56 2002
         3/23/04 23:34:57
         current locale setting (your system's format)

   current
       read-only, integer
       Current reading. Actual current depends on Rsens resistor (see
       datasheet).
       The formula for current is I = current /(4096*Rsens)
       with units in Amps and Ohms.
       Current measurement will be temporarily enabled (see Ienable ) if not
       currently enabled (pun intended) for this reading.

   disconnect/date
       read-write, ascii
       26 character date representation of the disconnect/udate value. Time
       when the battery pack waws removed from the charger. Format is the same
       as the date property.

   disconnect/udate
       read-write, unsigned integer
       Representation of disconnect/date as a number. See udate for details.

   endcharge/date
       read-write, ascii
       26 character date representation of the endcharge/udate value. Format
       is the same as the date property.

   endcharge/udate
       read-write, unsigned integer
       Representation of endcharge/date as a number. See udate for details.

   Ienable
       read-write, unsigned integer
       Status of current monitoring. When enabled, current sensing is
       performed 36.41 times/second. Values of Ienable are:

       0      no current conversion

       1      current conversion enabled

       2      current conversion and accumulation

       3      current conversion and accumulation with EEPROM backup

   pages/page.0 ... pages/page.7 pages/page.ALL
       read-write, binary
       Memory is split into 8 pages of 8 bytes each. Only the pages 3-7 are
       really available, and some of that appears to be reserved. See the
       datasheet for details.
       ALL is an aggregate of the pages. Each page is accessed sequentially.

   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 takes ~20 msec.

   udate
       read-write, unsigned integer
       Time represented as a number.  udate increments once per second.
       Usually set to unix time standard: number of seconds since Jan 1, 1970.
       The date field will be the unix representation (ascii text) of udate
       and setting either will change the other.

   VAD VDD
       read-only, floating point
       Voltage read (~10 bits) at the one of the chip's two supply voltages.
       Range VDD= 2.4V to 10V, VAD=1.5 to 10V.


STANDARD PROPERTIES

       See the file man3/standard.3so.


ALARMS

       None.


DESCRIPTION

       See the file man3/description.3so.

   DS2437
       The DS2437 (3) is an obsolete version of the DS2438 (3) battery chip.
       Current sensing is available, but not implemented. The major advantage
       compared to the DS2436 is that two voltages can be read, allowing
       correcting circuit nmeasurements to supply voltage and temperature. A
       better comparison is the DS276x family of chips.


ADDRESSING

       See the file man3/addressing.3so.


DATASHEET

       http://pdfserv.maxim-ic.com/en/ds/DS2437.pdf
       http://pdfserv.maxim-ic.com/en/an/humsensor.pdf


SEE ALSO

       See the file man3/seealso.3so.


AVAILABILITY

       http://www.owfs.org


AUTHOR

       Paul Alfille (paul.alfille@gmail.com)

OWFS Manpage                         2003                            DS2437(3)

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