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DS2740(3)		     One-Wire File System		     DS2740(3)

NAME
       DS2740 - High-Precision Coulomb Counter

SYNOPSIS
       Voltage and Switch

       36  [.]XXXXXXXXXXXX[XX][/[  memory  |  PIO  |  sensed  |	 vis | vis_B |
       volthours |
       smod |
       ]]

FAMILY CODE
       36

SPECIAL PROPERTIES
   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.

   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.

   vis
       read-only, floating point
       Current sensor reading (unknown external resistor). Measures the	 volt‐
       age 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.

   vis_B
       read-only, floating point
       Current	sensor reading (unknown external resistor). Measures the volt‐
       age gradient between the Vis pins. Units are in Volts
       The vis readings are integrated over  time  to  provide	the  volthours
       property.
       The vis_B is from a different tuning of the DS2740 (3) chip with faster
       sampling and lower resolution.  There is no way to  know	 this  through
       software.

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

OBSCURE PROPERTIES
   smod
       read-write, 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 cor‐
       responds to a 1 bit value.
       Default power-on state for the corresponding properties.

STANDARD PROPERTIES
ALARMS
       None.

DESCRIPTION
   DS2740
       The  DS2740  (3)	 is a class of battery charging controllers. This chip
       measures voltage and volthours, and has a pin that can be used for con‐
       trol.

ADDRESSING
DATASHEET
       http://pdfserv.maxim-ic.com/en/ds/DS2740.pdf

SEE ALSO
AVAILABILITY
       http://www.owfs.org

AUTHOR
       Paul Alfille (paul.alfille@gmail.com)

OWFS Manpage			     2003			     DS2740(3)

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