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DS18X20 B7 Chip Die Problems
DS18x20 EEPROM Corruption Issue on revision B7 die. This effects the popular DS18B20, DS1820S, and DS1822.
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The former Dallas EMail 1-wire mailing lists have moved to a new location... and are now totally run by the 1-wire community!
News Items

See some of the latest 1-wire related news info

2004-09-01 Design flaw/ documentation error found in DS2482-800

  • The DS2482-800 pulls the SDA line low after it NACK's an address. In addition there is a documentation error with the current documention reporting its address as $18h not $30h.

2004-08-11 Uncomfirmed reports that the DS1957 It is not recommended to use in development.

  • We are still waiting for confirmation from Dallas Semiconductor.
  •  Maxim-Dallas informs, that DS1957 is not recommended to use in development. In the near future the information on it will be removed from a site, and the device will be removed from manufacture. It is recommended to developers to use DS1955-600.

2004-06-22 New 1-wire chip released,  the DS2482-800

  • The DS2482-800 is an I²C™ to 1-Wire bridge device that interfaces directly to standard (100kHz max) or fast (400kHz max) I²C masters to perform bi-directional protocol conversion between the I²C master and any downstream 1-Wire slave devices. Relative to any attached 1-Wire slave device, the DS2482-800 is a 1-Wire master. Internal factory-trimmed timers relieve the system host processor from generating time-critical 1-Wire waveforms, supporting both standard and Overdrive 1-Wire communication speeds. To optimize 1-Wire waveform generation, the DS2482-800 performs slew-rate control on rising and falling 1-Wire edges and has a programmable feature to mask the fast presence pulse edge that some 1-Wire slave devices can generate. Programmable strong pullup features support 1-Wire power delivery to 1-Wire devices such as EEPROMs and sensors. The DS2482-800 combines these features with eight independent 1- Wire I/O channels. The I²C slave address assignment is controlled by three binary address inputs, resolving potential conflicts with other I²C slave devices in the system. Get the datasheet from this location: http://pdfserv.maxim-ic.com/en/ds/DS2482-800.pdf

  • It appears that the shipping date for the DS18B20 C2 version has slipped a bit, Dallas currently quotes September 24 as the current shipping date. as of 2004/06/22

2004-06-04 All DS18X20's B7 die chips identified

  • Thanks to the continued work of Brian D. Hindman and Mike Mitchell at Dallas Semiconductor we now have the complete list of serial numbers that identifiy B7 die DS18B20's. Get Details here 

2004-05-21 DS18B20's B7 die chips identified

  • Thanks to Brian D. Hindman at Dallas Semiconductor we now have a list of serial numbers that identifiy B7 die DS18B20's. Get Details here 

2004-05-20 Dallas Switches to Fourm based support system

  • Though almost universally disliked by the user community, Dallas has switched their discussion forums to a WEB based system. Citing spam and virus concerns with the existing list as the reasons for the change Dallas will discontinue normal operation as of June 15th 2004 

2004-05-16 New 1-Wire Board:

  • AAG releases the AAG Electronica TAI8558 1-Wire® Multiple I/O Board. The boardis comprised of four (4) general purpose relays and four (4) associated Green LED indicators for the relay “on/off” states, as well as four (4) general purpose Red LEDs that indicate I/O activity on four (4) optically isolated “sense” inputs.

 

2004-05-07 New 1-wire component :

  • The DS2431 1024-Bit 1-Wire EEPROM - Note device has new improved front end

06/02/04 - All DS18X20's B7 die chips identified 05/21/04 - DS18B20's B7 die chips identified 05/20/04 - Dallas Announces the move to a new Discussion forum 05/04/04 - New Revision of DS18x20 chips coming
04/08/04 - Dallas Semiconductor has trouble with chip die

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