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DS2406(3)		     One-Wire File System		     DS2406(3)

NAME
       DS2406,	DS2407	-  Dual	 Addressable Switch with 1kbit Memory, Hidable
       Dual Addressable	Switch with 1kbit Memory

SYNOPSIS
       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|pres-
       sure]  |	T8A/volt.[0-7,ALL] address | crc8 | id | locator | r_address |
       r_id | r_locator	| type ]]

FAMILY CODE
       12

SPECIAL	PROPERTIES
   channels
       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.

   memory
       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.

   PIO.A PIO.B PIO.ALL PIO.BYTE
       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	polar-
       ity  -- 0 for conducting, 1 for non-conducting. However,	to turn	a con-
       nected 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.

   power
       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.

   set_alarm
       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).

       Example:

       311    Responds on Conditional Search when either  latch.A  or  latch.B
	      (or both)	are set	to 1.

       <100   Never responds to	Conditional Search.

   TAI8570/
       subdirectory
       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.

   TAI8570/pressure
       read-only, floating point
       Barometric pressure in millibar.

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

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

   T8A/volt.[0-7|ALL]
       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.

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.  Com-
       puted  from the preceding 56 bits of the	unique ID number. Given	as up-
       per 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  applica-
       tions 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
       Use the set_alarm property to set the alarm triggering criteria.

DESCRIPTION
   1-Wire
       1-wire is a wiring protocol and series of devices designed and manufac-
       tured  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 (humid-
       ity, 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  en-
       cryption	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, par-
       allel, 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 in-
       dividual	 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 com-
       munication.  Still the fundemental goal has been	ease of	use, flexibil-
       ity and correctness rather than speed.

   DS2406
       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

   TAI8570
       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 ad-
       dress can be shown as sibling.

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

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

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/DS2406.pdf
       http://pdfserv.maxim-ic.com/en/ds/DS2407.pdf
       http://www.embeddeddatasystems.com/page/EDS/PROD/IO/T8A
       http://oww.sourceforge.net/hardware.html#bp

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) MAX31826
       (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)

   Moisture
       EEEF (3)	DS2438 (3)

AVAILABILITY
       http://www.owfs.org

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

OWFS Manpage			     2003			     DS2406(3)

NAME | SYNOPSIS | FAMILY CODE | SPECIAL PROPERTIES | STANDARD PROPERTIES | ALARMS | DESCRIPTION | ADDRESSING | DATASHEET | SEE ALSO | AVAILABILITY | AUTHOR

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