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       DS2406, DS2407 - Dual Addressable Switch with 1kbit Memory


       Dual Switch, Write-once Memory

       12  [.]XXXXXXXXXXXX[XX][/[ channels | latch.[A|B|ALL|BYTE] | memory | pages/page.[0-3|ALL]
       |    PIO.[A|B|ALL|BYTE]    |    power    |    sensed.[A|B|ALL|BYTE]    |    set_alarm    |
       TAI8570/[sibling|temperature|pressure]  | T8A/volt.[0-7,ALL] address | crc8 | id | locator
       | r_address | r_id | r_locator | type ]]




       read-only, unsigned integer
       Is this a 1 or 2 channel switch? The DS2406 comes in two forms, one has only one  PIO  pin
       (PIO.A). Returns 1 or 2.

   latch.A latch.B latch.ALL latch.BYTE
       read-write, yes-no
       The  activity  latch  is set to 1 with the first negative or positive edge detected on the
       associated PIO channel.
       Writing any data will clear latch for all (both)) channels. This is a  hardware  "feature"
       of the chip.
       ALL references both channels simultaneously, comma separated
       BYTE references both channels simultaneously as a single byte, with channel A in bit 0.

       read-write, binary
       128 bytes of non-volatile, write-once data.

   pages/page.0 ... pages/page.3 pages/page.ALL
       read-write, binary
       Memory organized as 4 pages or 32 bytes. Memory is write-once.
       ALL is the aggregate of all 4 pages, sequentially accessed.

       read-write, yes-no
       State of the open-drain output ( PIO ) pin. 0 = non-conducting (off), 1 = conducting (on).
       Writing  zero  will turn off the switch, non-zero will turn on the switch. Reading the PIO
       state will return the switch setting (flipflop in the data sheet). To determine the actual
       logic level at the switch, refer to the sensed property.
       Note  that  the  actual  pin  setting  for  the  chip  uses the opposite polarity -- 0 for
       conducting, 1 for non-conducting. However, to turn a connected device on (i.e. to  deliver
       power) we use the software concept of 1 as conducting or "on".
       ALL references both channels simultaneously, comma separated.
       BYTE references both channels simultaneously as a single byte, with channel A in bit 0.

       read-only, yes-no
       Is the DS2406 powered parasitically =0 or separately on the Vcc pin =1

   sensed.A sensed.B sensed.ALL sensed.BYTE
       read-only, yes-no
       Logic level at the PIO pin. 0 = ground. 1 = high (~2.4V - 5V ). Really makes sense only if
       the PIO state is set to zero (off), else will read zero.
       ALL references both channels simultaneously, comma separated.
       BYTE references both channels simultaneously as a single byte, with channel A in bit 0.

       read-write, unsigned integer (0-331)
       A number consisting of three digits XYZ, where:

       X      channel selection
              0 neither
              1 A only
              2 B only
              3 A or B

       Y      source selection
              0 undefined
              1 latch
              2 PIO
              3 sensed

       Z      polarity selection
              0 low
              1 high

       All digits will be truncated to the 0-3 (or 0-1) range. Leading zeroes are  optional  (and
       may be problematic for some shells).


       311    Responds  on Conditional Search when either latch.A or latch.B (or both) are set to

       <100   Never responds to Conditional Search.

       Properties when the DS2406 (3) is built into a TAI8570.
       If the DS2406 (3) is not part of a TAI8570 or is not the controlling switch,  attempts  to
       read will result in an error.

       read-only, floating point
       Barometric pressure in millibar.

       read-only, ascii
       Hex address of the DS2406 (3) paired with this chip in a TAI8570.

       read-only, floating-point
       Ambient temperature measured by the TAI8570 in prevailing temperature units (Centigrade is
       the default).

       read-only, floating-point
       Uses the T8A (by Embedded Data Systems ) 8 channel voltage converter. Units in volts, 0 to
       5V range. 12 bit resolution.


       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.


       Use the set_alarm property to set the alarm triggering criteria.


       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.

       The  DS2406  (3)  allows control of other devices, like LEDs and relays. It superceeds the
       DS2405 and DS2407 Alternative switches include the DS2408 or even DS2450
       The DS2407 is practically identical to the DS2406 except for a strange hidden mode. It  is
       supported just like the DS2406

       The  TAI-8570  Pressure  Sensor  is based on a 1-wire composite device by AAG Electronica.
       The TAI8570 uses 2 DS2406 (3) chips, paired as a reader and writer  to  synthesize  3-wire
       communication.  Only 1 of the DS2406 (3) will allow temperature or pressure readings. It's
       mate's address can be shown as sibling.

       The TAI8570 uses the  Intersema  MS5534a  pressure  sensor,  and  stores  calibration  and
       temperature compensation values internally.

       Design  and  code examples are available from AAG Electronica , specific
       permission to use code in a GPL product was given by Mr. Aitor  Arrieta  of  AAG  and  Dr.
       Simon Melhuish of OWW.


       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)

       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)



       Paul Alfille (