Provided by: owfs-doc_3.1p1-2ubuntu1_all bug


       DS28E04 - 1-Wire EEPROM chip (4096-bit) with seven address inputs


       4096-bit EEPROM, 2 port switch

       1C   [.]XXXXXXXXXXXX[XX][/[   latch.[0-1|ALL|BYTE]   |   PIO.[0-1|ALL|BYTE]   |   power  |
       sensed.[0-1|ALL|BYTE] | polarity | por | set_alarm | address |  crc8  |  id  |  locator  |
       r_address | r_id | r_locator | type ]]




   latch.0 latch.1 latch.ALL latch.BYTE
       read-write, binary
       The  2  pins  (PIO)  latch a bit when their state changes, either externally, or through a
       write to the pin.
       Reading the latch property indicates that the latch has been set.
       Writing any data to ANY latch will reset them all. (This is the hardware design).
       ALL is all latch states, accessed simultaneously, comma separated.
       BYTE references all channels simultaneously as a single byte. Channel 0 is bit 0.

       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. To determine the actual logic level at the switch,
       refer to the sensed.0 sensed.1 sensed.ALL sensed.BYTE property.
       ALL references all channels simultaneously, comma separated.
       BYTE references all channels simultaneously as a single byte. Channel 0 is bit 0.

       read-only, yes-no
       Is the DS28E04 powered parasitically (=0) or separately on the Vcc pin (=1)?

   sensed.0 sensed.1 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 all channels simultaneously, comma separated.
       BYTE references all channels simultaneously as a single byte. Channel 0 is bit 0.

       read-only, yes-no
       Reports  the state of the POL pin. The state of the POL pin specifies whether the PIO pins
       P0 and P1 power up high or low. The polarity of a pulse generated at  a  PIO  pin  is  the
       opposite of the pin's power-up state.

       0      PIO powers up 0

       1      PIO powers up 1

       read-write, yes-no
       Specifies whether the device has performed power-on reset. This bit can only be cleared to
       0 under software control. As long as this bit is 1 the device will allways  respond  to  a
       conditional search.

       read-write, integer unsigned (0-333)
       A number consisting of 3 digits XYY, where:

       X      select source and logical term
              0 PIO   OR
              1 latch OR
              2 PIO   AND
              3 latch AND

       Y      select channel and polarity
              0 Unselected (LOW)
              1 Unselected (HIGH)
              2 Selected    LOW
              3 Selected    HIGH

       All  digits  will  be  truncated  to the 0-3 range. Leading zeroes are optional. Low-order
       digit is channel 0.


       133    Responds on Conditional Search when latch.1 or latch.0 are set to 1.

       222    Responds on Conditional Search when sensed.1 and sensed.0 are set to 0.

       000 (0)
              Never responds to Conditional Search.


       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 principle 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 DS28E04 (3) is a memory chip that bends the  unique  addressing  capabilities  of  the
       1-wire design. Some of the ID bits can be assigned by hardware.


       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) MAX31826 (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)

       EEEF (3) DS2438 (3)



       Paul Alfille (