NAME

       DS2436 - Battery ID/Monitor Chip

SYNOPSIS

       Temperature Voltage and Memory.

       1B  [.]XXXXXXXXXXXX[XX][/[  pages/page.[0-4|ALL] | temperature | volts | counter/cycles | counter/reset |
       counter/increment | address | crc8 | id | locator | r_address | r_id | r_locator | type ]]

FAMILY CODE

       1B

SPECIAL PROPERTIES

   pages/page.0 ... pages/page.4 pages/page.ALL
       read-write, binary
       Memory is split into 5 pages of 32 bytes each. Only the first 3 pages are really available, and  some  of
       that appears to be reserved. See the datasheet for details.

       pages/page.0 is locked and unlocked transparently for every write.

       ALL is an aggregate of the pages. Each page is accessed sequentially.

   temperature
       read-only, floating point
       Temperature  read by the chip at high resolution (~13 bits). Units are selected from the invoking command
       line. See owfs(1) or owhttpd(1) for choices. Default is Celsius.  Conversion takes ~20 msec.

   volts
       read-only, floating point
       Voltage read (~10 bits) at the chip's supply voltage Vdd. Range 2.4V to 10V.

   counter/
       A resettable non-volatile counter intended for counting battery discharge cycles.

   counter/cycles
       read-only, unsigned integer
       Cycle counter value. Stored at memory location 0x82.

   counter/increment
       write-only, yes/no
       Any non-zero (true) value will increment counter/cycles by one.

   counter/reset
       write-only, yes/no
       Any non-zero (true) value will reset counter/cycles to zero.

STANDARD PROPERTIES

   address
   r_address
       read-only, ascii
       The entire 64-bit unique ID. Given as upper case hexadecimal 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. Computed from the preceding 56 bits  of
       the unique ID number. Given as upper case hexadecimal digits (0-9A-F).

   family
       read-only, ascii
       The 8-bit family code. Unique to each type of device. Given as upper case hexadecimal 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 hexadecimal digits (0-9A-F).
       r id is the id in reverse order, which is often used in other applications 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 hexadecimal) 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

       None.

DESCRIPTION

   1-Wire
       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 fundamental goal has been ease of use,
       flexibility and correctness rather than speed.

   DS2436
       The DS2436 (3) is a simpler form of the DS2438 battery chip. It has no  counter,  and  only  one  voltage
       sensor.

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 hexadecimal, 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/DS2436.pdf

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) InfernoEmbedded (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 (3) EDS0066 (3) EDS0068 (3)

   Moisture
       EEEF (3) DS2438 (3)

AVAILABILITY

       http://www.owfs.org

AUTHOR

       Paul Alfille (paul.alfille@gmail.com)