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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
       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 1.

       <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
       address starts with the family code
       r address is the address in reverse order, which is often used in other
       applications and labeling.

       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).

       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 form:

       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 (

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